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A Brief History of Powdermill Nature Reserve Turtle Project

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Iten<br />

<strong>Powdermill</strong><br />

<strong>Nature</strong><br />

<strong>Reserve</strong><br />

2004 Report on<br />

Wood <strong>Turtle</strong>s,<br />

Box <strong>Turtle</strong>s<br />

and Painted<br />

<strong>Turtle</strong>s<br />

By<br />

Tricia<br />

Miller<br />

1


Table <strong>of</strong> Contents<br />

Introduction.................................................................................................... 1<br />

A <strong>Brief</strong> <strong>History</strong> <strong>of</strong> <strong>Powdermill</strong> <strong>Nature</strong> <strong>Reserve</strong> <strong>Turtle</strong> <strong>Project</strong>...................... 1<br />

Methods.......................................................................................................... 2<br />

Results............................................................................................................ 4<br />

Discussion...................................................................................................... 9<br />

Interesting Observations ................................................................................ 12<br />

Acknowledgments.......................................................................................... 14<br />

References...................................................................................................... 27<br />

i


Table <strong>of</strong> Figures<br />

Table 1. Wood <strong>Turtle</strong> #191 and #174 Data Comparison.............................. 4<br />

Figure 1. Photo <strong>of</strong> Dr. M. Graham Netting.................................................. 1<br />

Figure 2. Map <strong>of</strong> 2004 Transect and <strong>Turtle</strong> Encounters .............................. 3<br />

Figure 3. Map <strong>of</strong> <strong>Turtle</strong> Encounters, 1960 - 2004 ....................................... 5<br />

Figure 4. Number <strong>of</strong> Wood <strong>Turtle</strong>, Box <strong>Turtle</strong> & Painted <strong>Turtle</strong><br />

Encounters per Month, 1960 – 2004............................................ 6<br />

Figure 5. Percent Female Wood <strong>Turtle</strong>s & Box <strong>Turtle</strong>s<br />

Encountered, 1960 – 2003, 1992, 1993 & 2004. ......................... 7<br />

Figure 6. Number <strong>of</strong> Wood <strong>Turtle</strong> & Box <strong>Turtle</strong> Observations per<br />

Hour, 1960 - 2004........................................................................ 7<br />

Figure 7. Number <strong>of</strong> Wood <strong>Turtle</strong> & Box <strong>Turtle</strong> Records per 5-year<br />

Period, 1960 -2003....................................................................... 8<br />

Figure 8. Number <strong>of</strong> Wood <strong>Turtle</strong> & Box <strong>Turtle</strong>s Encountered<br />

per Year, 1960- 2003 ................................................................... 9<br />

Figure 9. Photo <strong>of</strong> Carapace <strong>of</strong> Wood <strong>Turtle</strong> #191. .................................... 11<br />

Figure 10. Map <strong>of</strong> Observations <strong>of</strong> Box <strong>Turtle</strong> #46...................................... 12<br />

Figure 11. Photo <strong>of</strong> Box <strong>Turtle</strong> #7 Plastron .................................................. 13<br />

Figure 12. Map <strong>of</strong> Observations <strong>of</strong> Box <strong>Turtle</strong> #7........................................ 13<br />

Appendix A. 2004 <strong>Turtle</strong> Data Form........................................................... 15<br />

Appendix B. PNR <strong>Turtle</strong> Form ................................................................... 17<br />

Appendix C. <strong>Turtle</strong> Drop-<strong>of</strong>f Form............................................................. 18<br />

Appendix D. Number and species <strong>of</strong> turtles found each year from<br />

1960 – 2004............................................................................ 19<br />

Appendix E. Number <strong>of</strong> captures per year for each individual<br />

Painted <strong>Turtle</strong>, Wood <strong>Turtle</strong> and Box <strong>Turtle</strong>......................... 20<br />

ii


Introduction<br />

With an increasing human population, turtles are coming under increasing pressures from<br />

road kills, collection for the pet trade and agricultural intensification (Ashley & Robinson<br />

1996, Saumure and Bider 1998, Hulse et al. 2000). Because <strong>of</strong> their longevity and low<br />

fecundity, population responses <strong>of</strong> turtles to disturbance may not be noticeable for<br />

decades (Findlay & Bourdages 2000). Therefore, long-term studies <strong>of</strong> turtle populations<br />

are required to determine turtle population trends. However, few long-term studies have<br />

been conducted on turtles, and Yahner (2003) notes that knowledge <strong>of</strong> “long-term trends<br />

<strong>of</strong> terrestrial vertebrates in Pennsylvania is uncommon.”<br />

One <strong>of</strong> Pennsylvania’s little known long-term studies on turtles was begun on <strong>Powdermill</strong><br />

<strong>Nature</strong> <strong>Reserve</strong> (PNR), Biological Field Station <strong>of</strong> The Carnegie Museum <strong>of</strong> Natural<br />

<strong>History</strong> in 1959. The study has focused mainly on Wood <strong>Turtle</strong>s (Graptemys insculpta<br />

formerly Clemmys insculpta) and Eastern Box <strong>Turtle</strong>s (Terrapene carolina carolina), but<br />

has recently included Painted <strong>Turtle</strong>s (Chrysemys picta) as a focal species.<br />

A <strong>Brief</strong> <strong>History</strong> <strong>of</strong> <strong>Powdermill</strong> <strong>Nature</strong> <strong>Reserve</strong> <strong>Turtle</strong> <strong>Project</strong><br />

The <strong>Powdermill</strong> <strong>Nature</strong> <strong>Reserve</strong> (PNR)<br />

<strong>Turtle</strong> <strong>Project</strong> has a long history. It was<br />

initiated in 1959, when Dr. Graham<br />

Netting (Fig. 1), then Director <strong>of</strong> Carnegie<br />

Museum <strong>of</strong> Natural <strong>History</strong>, began<br />

collecting morphological and capture<br />

location data on Wood <strong>Turtle</strong>s and<br />

Eastern Box <strong>Turtle</strong>s. For his study, each<br />

turtle was uniquely marked. Initially, Dr.<br />

Netting uniquely notched a single<br />

marginal scute or a combination <strong>of</strong> scutes.<br />

He also used model airplane paint in<br />

consort with the notching. In 1962, he<br />

Figure 1. Dr. M. Graham Netting taking data on a<br />

began engraving the plastron with a<br />

male Box <strong>Turtle</strong>. Date unknown.<br />

unique number while occasionally<br />

continuing to notch the marginal scutes.<br />

By 1964 he was only marking with numbers<br />

on the plastron.<br />

Although some deliberate searching for turtles was done part-time by a Ted Rich, young<br />

paid intern, in 1992 and 1993, 2004 marks the first year that a standard transect route was<br />

used to survey for turtles throughout an entire season. Objectives <strong>of</strong> the 2004 season were<br />

to improve and update the existing database and to complete the geographic information<br />

systems (GIS) data layer in order to prepare them for analysis and publication. The main<br />

observer was Tricia Miller, working under the direction <strong>of</strong> Dr. Walter Meshaka, State<br />

Museum <strong>of</strong> Pennsylvania and PNR Associate Researcher, and Robert Mulvihill, MSc.,<br />

PNR Staff. Volunteer Mary Mock assisted on many occasions.<br />

1


Methods (2004)<br />

A 4.5 km transect route was established (Fig. 2) as a means <strong>of</strong> standardizing the search<br />

for turtles. The route began at the Bird Banding Laboratory and included all known major<br />

nesting sites as well as areas where large numbers <strong>of</strong> turtles had been observed in the<br />

past. Observers walked along the route visually searching for turtles from June 1st to July<br />

29 th . The route was usually walked twice daily, once in the morning beginning at about 8<br />

am and again in the evening beginning at about 6 pm<br />

Before each route, weather data (including air temperature, relative humidity,<br />

precipitation and percent cloud cover) were taken and the start time was recorded. When<br />

a turtle was found, the following data were recorded on a field data sheet (Appendix A):<br />

time, species, capture type (new or recapture), identification number, behavior (i.e.<br />

digging, walking, etc.), GPS location, air temperature, percent canopy cover, and habitat.<br />

Newly encountered turtles, as well as recaptures encountered for the first time during the<br />

season, were transported in a canvas bag back to the Bird Banding Laboratory for further<br />

processing. All new turtles were engraved with a unique, sequential number, while the ID<br />

number for recaptures were simply noted and re-engraved as necessary. Three Box<br />

<strong>Turtle</strong>s (#46, 80, 81) were temporarily marked with numbers on their carapace in order to<br />

reduce disturbance <strong>of</strong> these individuals. Morphological measurements were taken<br />

including weight, carapace length and width, and plastron length and width (Appendix A,<br />

B). For Box <strong>Turtle</strong>s only, front and rear sections <strong>of</strong> the hinged plastron were measured<br />

and recorded separately. Sex was determined using external physical characteristics<br />

unique to each species (Hulse et al. 2000). All scars and other markings were noted and<br />

digital photographs were taken. Once a turtle was fully processed, it was returned to its<br />

original place <strong>of</strong> capture.<br />

Many turtles were encountered more than once during the season. Here, care was taken to<br />

disturb them as little as possible. The turtles were turned over to identify, except in the<br />

case <strong>of</strong> Box <strong>Turtle</strong> #46, them and immediately replaced. As with initial seasonal<br />

encounters, behavior, location, habitat and weather data were taken.<br />

Several turtles were encountered opportunistically, <strong>of</strong>f <strong>of</strong> the transect route. Often these<br />

were encountered by persons other than the main observers. These opportunistic<br />

encounters were considered to be incidental captures and were noted as such on the data<br />

sheet (Appendix A) Persons who encountered these turtles were requested to fill out the<br />

<strong>Turtle</strong> Drop-<strong>of</strong>f Form (Appendix C). If staff were not present when a turtle was found,<br />

observers were instructed by signs to place the turtle in the turtle enclosure, a 5 foot by<br />

2.5 foot enclosure located behind the Bird Banding Laboratory, which is safe from<br />

predators. Care was taken to process the turtles as soon a reasonably possible. If<br />

processing was not possible until after dark, the turtle was kept overnight in the enclosure<br />

and returned to the capture site the next morning.<br />

2


Figure 2. Map <strong>of</strong> 2004 transect route and all turtles during the 2004 season.<br />

3


Results<br />

Over the course <strong>of</strong> the 2004 season a total <strong>of</strong> 24 different turtles were encountered,<br />

including 3 Wood <strong>Turtle</strong>s, 16 Box <strong>Turtle</strong>s and 5 Painted <strong>Turtle</strong>s. Of the 16 Box <strong>Turtle</strong>s<br />

encountered, 6 were new and 10 were recaptures, marked in a previous year. Two <strong>of</strong> the<br />

Wood <strong>Turtle</strong>s were new and one was a recapture. All five painted turtles encountered<br />

were new.<br />

Many turtles were encountered more than once during the season for a total <strong>of</strong> 59<br />

observations. Of the 59 observations, 44 were along the transect and 15 were<br />

opportunistic. Opportunistic encounters occurred from May 22 nd to October 2 nd . The<br />

majority <strong>of</strong> turtles were found in two major nesting areas (Fig. 2), hence the majority<br />

were female.<br />

Of the 24 individual turtles encountered 20 were female and only were 4 male (1 Wood<br />

<strong>Turtle</strong>, 2 Box <strong>Turtle</strong>s and 1 Painted <strong>Turtle</strong>) (Fig. 3). Only 1 male turtle, a Wood <strong>Turtle</strong>,<br />

was found during a transect and no male turtles were encountered more than once during<br />

the season. In contrast, 57% (n = 8) <strong>of</strong> the females encountered were seen on more than<br />

one occasion generally over consecutive days while the females were attempting to nest.<br />

One turtle in particular, Box <strong>Turtle</strong> #46, accounted for 37% (n = 19) <strong>of</strong> the total Box<br />

<strong>Turtle</strong> encounters.<br />

Of the three Wood <strong>Turtle</strong>s encountered two were new and one was a recapture. However,<br />

for several reasons, I suspect that the new wood turtle marked #190 is very likely to be<br />

#174 last seen in 1993. First, the plastron appeared to have had some kind <strong>of</strong> marking<br />

where a number would have been engraved. Second, both turtles were greater than 18<br />

years old<br />

Carapace Carapace Plastron Data<br />

Capture<br />

Age Weigh Length Width Length collected<br />

Number date Capture Location<br />

open spoils area<br />

across road from<br />

Sex (yrs) t (g) (mm) (mm) (mm) by<br />

190 6/1/2004 Middle Strip Mine<br />

mine pond, 10ft. from<br />

M 20+ 1045 189.5 142.5 161 RSM<br />

174 6/6/1993 bank in woods M 35+ 1004 190 143 160 TR<br />

Table 1. Capture location and morphological measurements <strong>of</strong> two wood turtles suspected to be the<br />

same individual.<br />

at the time <strong>of</strong> capture, and measurements change very little if any after that age (PNR<br />

Data, Brooks et al. 1992). The morphological measurements <strong>of</strong> #190 are within 0.5mm <strong>of</strong><br />

#174. Third, the capture locations are within 20 meters <strong>of</strong> one another (Tab. 1). Though<br />

several Wood <strong>Turtle</strong>s’ engravings have lasted for more than 20 years (PNR Data), several<br />

other Wood <strong>Turtle</strong>s have worn their numbers <strong>of</strong>f. These individuals had additional<br />

markings (e.g. marginal scute notches) that enabled positive identification. Moreover, I<br />

have noticed that the plastron on Wood <strong>Turtle</strong>s is distinctly thinner than that <strong>of</strong> Box<br />

4


Figure 3. Map <strong>of</strong> turtle encounters from 1960 – 2004.<br />

5


<strong>Turtle</strong>s disallowing deep engravings to be made which may lead to premature loss <strong>of</strong> the<br />

engraving through wear. This seems to be a limitation <strong>of</strong> marking Wood <strong>Turtle</strong>s, in<br />

particular and possibly Painted <strong>Turtle</strong>s, who have a similarly thin plastron, in this way,<br />

and warrants further investigation into other long-lasting marking techniques. Due to a<br />

noticeably thicker plastron, Box <strong>Turtle</strong>s have not proven to have the same problem. For<br />

example, a Box <strong>Turtle</strong> captured this year and originally etched in 1967 still had a clearly<br />

visible number on its plastron. Three other Box <strong>Turtle</strong>s (2, 7, & 20) not seen for more<br />

than 20 years were also still identifiable (Appendix A).<br />

In addition to compiling the data for 2004, I have compiled and analyzed some <strong>of</strong> the<br />

previous data. The PNR turtle database contains information on 264 individual turtles <strong>of</strong><br />

four species. To date 10 Snapping <strong>Turtle</strong>s, 16 Painted <strong>Turtle</strong>s, 82 Box <strong>Turtle</strong>s, 158 Wood<br />

<strong>Turtle</strong>s have been marked on the reserve (Fig. 3, Appendix D, E). The total number <strong>of</strong><br />

recaptures is 241, while 8 turtles have been found dead, for a total database <strong>of</strong> original,<br />

recapture and dead individuals <strong>of</strong> 503 records.<br />

Live turtles have been encountered in nine months out <strong>of</strong> the year over the past 44 years<br />

(Fig. 4). No turtles have been encountered in February or December. In addition to the<br />

likely months for encounters, one Wood <strong>Turtle</strong> was found in January on a “warm and<br />

balmy” day in the mud next to <strong>Powdermill</strong> Run at Calvarly Lodge by Dr. Netting.<br />

Another Wood <strong>Turtle</strong> was spotted in a stream on November 11, 1964. Box <strong>Turtle</strong>s have<br />

only been encountered from April to October during the normal active months. The<br />

majority <strong>of</strong> all observations occur during the height <strong>of</strong> the breeding season in June. By far<br />

the greatest number <strong>of</strong> turtles encountered were found in the Bird Banding Area, where<br />

Number <strong>of</strong> Encounters<br />

140<br />

120<br />

100<br />

80<br />

60<br />

40<br />

20<br />

0<br />

Number <strong>of</strong> <strong>Turtle</strong> Encounters per Month (1960 - 2004)<br />

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec<br />

Month<br />

Painted <strong>Turtle</strong> (n=18) Wood <strong>Turtle</strong> (n=286) Box <strong>Turtle</strong> (n=192)<br />

Figure 4. Number <strong>of</strong> Painted <strong>Turtle</strong>s, Wood <strong>Turtle</strong>s and Box <strong>Turtle</strong>s encountered each month from<br />

1960 – 2004.<br />

6


Number <strong>of</strong> <strong>Turtle</strong>s<br />

18<br />

16<br />

14<br />

12<br />

10<br />

Percent<br />

100%<br />

90%<br />

80%<br />

70%<br />

60%<br />

50%<br />

40%<br />

30%<br />

20%<br />

10%<br />

0%<br />

Percent Female <strong>Turtle</strong>s Encountered<br />

Wood <strong>Turtle</strong> Box <strong>Turtle</strong><br />

Species<br />

1959-2003 (n = 407) 1992 (n = 19)<br />

1993 (n = 21) 2004 (n = 24)<br />

Figure 5. Percent female turtles encountered from 1960 – 2003, in 1992, 1993 and<br />

2004. 2004 data based on individuals due to abnormally high number <strong>of</strong> re-encounters<br />

with one individual (Box <strong>Turtle</strong> #46). Unknown individuals were not included when<br />

calculating percentages.<br />

8<br />

6<br />

4<br />

2<br />

0<br />

Number <strong>of</strong> <strong>Turtle</strong>s Observed per Hour (1960 - 2004)<br />

(N = 116)<br />

500 500<br />

600 600<br />

700 700<br />

800 800<br />

900 900<br />

1000 1000<br />

1100 1100<br />

1200 1200<br />

1300 1300<br />

1400 1400<br />

1500 1500<br />

1600 1600<br />

1700 1700<br />

1800 1800<br />

1900 1900<br />

2000 2000<br />

2100 2100<br />

Time (24 Hour Clock)<br />

Wood <strong>Turtle</strong> Box <strong>Turtle</strong><br />

Figure 6. Number <strong>of</strong> Wood <strong>Turtle</strong>s, Box <strong>Turtle</strong>s observed by hour from 1960 – 2004.<br />

7


Robert Leberman and, subsequently, Robert Mulvihill, have made regular net rounds,<br />

every 30-40 minutes each morning six days a week from March through November since<br />

1961 (Fig. 4). Because no written information exists regarding active searching or use <strong>of</strong><br />

drift fences in the early years, it is assumed that nearly half <strong>of</strong> all turtle encounters at<br />

PNR have been opportunistic. The remaining half were encountered during three separate<br />

years (1992, 1993 and 2004), when intensive, strategic searching took place.<br />

In 1992, two Wood <strong>Turtle</strong>s and 17 Box <strong>Turtle</strong>s were found with a total <strong>of</strong> 23<br />

observations. In 1993, four Wood <strong>Turtle</strong>s and 15 Box <strong>Turtle</strong>s were found with a total <strong>of</strong><br />

27 observations (Appendix D, E). The numbers <strong>of</strong> turtles found in 1992 and 1993 are<br />

comparable to the number and species <strong>of</strong> turtles found in 2004. However, the percentage<br />

<strong>of</strong> females found in both years was significantly less than were found 2004 (Fig. 5).<br />

Though the time <strong>of</strong> capture was not required to be recorded on the PNR <strong>Turtle</strong> Data Form<br />

(Appendix D), times were recorded for 58 records prior to 2004. The patterns <strong>of</strong> daily<br />

observations show that Box <strong>Turtle</strong>s are distinctly bimodal, while Wood <strong>Turtle</strong>s appear to<br />

be most active in mid-morning. No conclusions can yet be drawn from the Painted <strong>Turtle</strong><br />

data though they are seen, but not able to be captured, basking in the ponds throughout<br />

the day (pers. obs.).<br />

Slightly less than half (n= 68) <strong>of</strong> all individual Wood <strong>Turtle</strong>s found on PNR were<br />

encountered during the first five years <strong>of</strong> the project with steady declines in capture rates<br />

for each subsequent five year period (Fig. 7). While Box <strong>Turtle</strong> (r 2 = 0.189) observations<br />

have remained stable, Wood <strong>Turtle</strong> encounters have decline significantly (r 2 = 0.5753, p<br />

< 0.05) between 1959 and 2003 (Fig. 8).<br />

90<br />

80<br />

70<br />

60<br />

50<br />

40<br />

30<br />

20<br />

10<br />

0<br />

Number <strong>of</strong> <strong>Turtle</strong> Records per 5-year Period<br />

(1960 - 2003)<br />

1960<br />

- 64<br />

1965<br />

- 69<br />

1970<br />

- 74<br />

1975<br />

- 79<br />

1980<br />

- 84<br />

1985<br />

- 89<br />

5-year Period<br />

Wood <strong>Turtle</strong> Box <strong>Turtle</strong><br />

1990<br />

- 94<br />

1995<br />

- 99<br />

2000<br />

- 03<br />

Figure 7. Number <strong>of</strong> Wood <strong>Turtle</strong>s and Box <strong>Turtle</strong>s encountered per five<br />

year period, 1960 -2003.<br />

8


Number <strong>of</strong> <strong>Turtle</strong>s<br />

25<br />

20<br />

15<br />

10<br />

5<br />

Number <strong>of</strong> <strong>Turtle</strong>s Encountered per Year (1960-2003)<br />

R 2 = 0.189<br />

R 2 = 0.5753<br />

0<br />

1950 1960 1970 1980 1990 2000 2010<br />

Year<br />

Wood <strong>Turtle</strong> (n=283) Box <strong>Turtle</strong> (n=144)<br />

Figure 8. Number <strong>of</strong> Wood <strong>Turtle</strong>s and Box <strong>Turtle</strong>s observed each year from 1960 – 2003.<br />

Discussion<br />

More female turtles were found than males during the 2004 season. This has also been<br />

the case in the past, from 1960 to 2003. For Box <strong>Turtle</strong>s, this is likely due to the fact that<br />

males do not wander from their territories during the breeding season; instead they breed<br />

with females holding adjacent territories or with those crossing through their territory on<br />

the way to a nesting location (Hulse et al. 2001). Additionally, because females must<br />

travel from their territories to find a nest site located in a sunny spot with well-drained<br />

soil and sparse vegetation, they are more likely to be seen. This was the case at PNR<br />

since most encounters with female Box <strong>Turtle</strong>s occurred at or near a nesting site. Also<br />

increasing the likelihood <strong>of</strong> finding more females is the fact that turtles are polygynous,<br />

and therefore there are more females in populations than males (Brooks et al. 1992). In<br />

addition, Tuttle and Carroll (2003) noted that female Wood <strong>Turtle</strong>s spent more time on<br />

land during the active season than males, who spent much <strong>of</strong> their time in streams.<br />

The 2004 turtle season was a great success with 59 observations adding weight to the<br />

existing dataset. Additionally, it supports the suspicion that Wood <strong>Turtle</strong>s are on the<br />

decline at PNR. However, anecdotal evidence does exist that may contradict these<br />

apparent declines. Mainly, it is unclear as to the intensity <strong>of</strong> searching that took place in<br />

the early years <strong>of</strong> the project when nearly 80 Wood <strong>Turtle</strong>s were found. Though there is<br />

no written record regarding the use <strong>of</strong> drift fences, Robert Mulvihill believes that they<br />

may have been used in the early 1960s. If so increased capture rates earlier in the study<br />

may partly explain the apparent declines that we are seeing today. It would be useful in<br />

9


the future to set up drift fences in key areas, such as along <strong>Powdermill</strong> Run near Cabin 5,<br />

Calvarly Lodge and in other areas where concentrations <strong>of</strong> Wood <strong>Turtle</strong>s have been<br />

previously found in an attempt to locate more individuals that may have been marked in<br />

the early years <strong>of</strong> the project. Although plastron engravings have been known to wear<br />

away, turtles marked in the early years were also marked by notching marginal scutes<br />

still allowing for identification today.<br />

If indeed there is a decline in the species determining the cause is essential. Several<br />

potential reasons for the decline should be considered, including habitat change, global<br />

climate change, intensification <strong>of</strong> agriculture and road kills.<br />

At PNR, particularly at the bird banding area, significant habitat change has taken place<br />

since 1960 when much <strong>of</strong> the area was either fields or early successional habitat and<br />

hence much more open (pers comm. Leberman). Areas like this provide prime nesting<br />

habitat for Wood <strong>Turtle</strong>s and also may lead to greater visibility and detectablity <strong>of</strong> them<br />

(Hulse et al. 2000). With the conversion <strong>of</strong> these open areas to mature forest, the turtles<br />

may have been forced to find different nesting areas and are, therefore, seen less<br />

frequently. Several fields that border PNR may provide this habitat and are worth<br />

investigating in future years, particularly the fields that border <strong>Powdermill</strong> Run near the<br />

cabin area.<br />

Climate change must also be considered as Wood <strong>Turtle</strong>s are at the southern end <strong>of</strong> their<br />

range at PNR. Increases in temperature may cause range contraction for this northern<br />

species.<br />

Road kills can have significant impacts on populations by skewing sex ratios. Steen and<br />

Gibbs (2003) have noted that road kills can significantly skew sex ratios <strong>of</strong> turtles<br />

because females must travel to located appropriate nesting habitat and are more likely to<br />

be the victim <strong>of</strong> automobiles. This will likely lead to unstable populations and population<br />

declines.<br />

Several hay fields border <strong>Powdermill</strong> Run and likely provide nesting and foraging habitat<br />

for Wood <strong>Turtle</strong>s. Like many such fields, with the exception <strong>of</strong> extremely wet years, they<br />

are hayed in June, at the height <strong>of</strong> the nesting season. This intensification <strong>of</strong> agriculture<br />

has been shown to harm turtles (Saumure and Bider 1998). One female Wood <strong>Turtle</strong> that<br />

was captured crossing Highway 381from a field to Laurel Run appeared to have been<br />

previously injured by a farm implement. The carapace was cut in a straight line and was<br />

injured from above because there was no s<strong>of</strong>t tissue scarring and no missing limbs. (Fig.<br />

9).<br />

Throughout their range, researchers have been noting declines in Wood <strong>Turtle</strong><br />

populations (Saumure and Bider 1998, Ernst 2001, Compton et al. 2002), however,<br />

impacts on Box <strong>Turtle</strong> populations from collecting for the pet trade have been overlooked<br />

until recently. The Sierra Club is currently campaigning the Pennsylvania Fish and Boat<br />

Commission to change its regulations regarding the collection <strong>of</strong> Eastern Box <strong>Turtle</strong>s.<br />

Current regulations allow for the legal take <strong>of</strong> two Box <strong>Turtle</strong>s per day. This is an<br />

alarming number given the life history traits <strong>of</strong> Box <strong>Turtle</strong>s. The long-term data collected<br />

10


Figure 9. Photo <strong>of</strong> damaged carapace <strong>of</strong> a female Wood <strong>Turtle</strong> (#191). There was no<br />

apparent s<strong>of</strong>t tissue damage, leading me to believe that the shell was damaged from above.<br />

on Box <strong>Turtle</strong>s at PNR has the potential to influence these regulations. Given the greater<br />

propensity to find females (3:1) and the clustering <strong>of</strong> females at nesting sites an entire<br />

population could be decimated within a few years. Consider the fact that in the years<br />

when active searching took place (1992, 1993 and 2004) 39 different individuals were<br />

observed. This represents nearly half <strong>of</strong> all Box <strong>Turtle</strong>s encountered at <strong>Powdermill</strong> since<br />

1961. In respect to populations, removing an animal from a population is equivalent to<br />

the death <strong>of</strong> an individual. Brooks et al. (1991) found that increased mortality <strong>of</strong><br />

reproducing adult turtles leads to population declines.<br />

While populations <strong>of</strong> Box <strong>Turtle</strong>s at PNR currently appear stable, two long-term studies<br />

<strong>of</strong> Box <strong>Turtle</strong>s have shown declines, though no possible cause was mentioned. Studies by<br />

Stickel (1978) in Maryland and Williams and Parker (1987) in Indiana both show<br />

declining populations <strong>of</strong> Box <strong>Turtle</strong>s. In 1960 Williams and Parker noted Box <strong>Turtle</strong><br />

densities <strong>of</strong> 5.7 turtles/ha, by 1983 it had dropped to 2.7 turtles/ha indicating that<br />

recruitment is not occurring at the same rate that it once had. Continued or increased<br />

monitoring <strong>of</strong> Box <strong>Turtle</strong>s on PNR is essential given these alarming declines.<br />

While few Painted <strong>Turtle</strong>s have been captured, their numbers seem to be on the rise. With<br />

this apparent increase greater efforts should be made to gather data on them.<br />

Additionally, different marking techniques should be investigated given their apparently<br />

thin plastron.<br />

11


Figure 10. Map <strong>of</strong> observations <strong>of</strong> Box <strong>Turtle</strong> #46 from June 7th to July 2 nd , 2004.<br />

Interesting Observations<br />

Finally, what follows are details <strong>of</strong> some selected individual histories for turtles observed<br />

in 2004. As previously noted, Box <strong>Turtle</strong> #46 accounted for 37% <strong>of</strong> all observations this<br />

season. She was seen 20 times from June 7, when she was first spotted along the Strip<br />

Mine Road attempting to dig a nest, to July 2 when she finally completed a nest and laid<br />

her eggs (Fig. 10). She was very unique in that she was the only turtle to investigate two<br />

different nesting areas, which has interesting implications in and <strong>of</strong> itself.<br />

Additionally, she remained inactive, burrowed beneath leaves on a mine tailing bank in<br />

the Middle Strip Mine from June 25 to July1. Interestingly, before she had moved to the<br />

Middle Strip Mine nesting area, on June 22, another turtle, Box <strong>Turtle</strong> #71, (seen 6 times<br />

over the course <strong>of</strong> the season), was also seen digging a nest along the Strip Mine Road.<br />

During the period from June 25 to July 1, #71 was not seen. On July 1, #71 was found<br />

along the Strip Mine Road digging her final nest attempt. I find it safe to assume that<br />

during the time when #46 was know to be inactive, #71 also remained inactive. Why this<br />

was the case, I don’t exactly know, but would believe that it was due to the low<br />

temperatures which ranged from 78 for a high to 45 for the low over that period <strong>of</strong> time.<br />

Additionally, from June 25 th to July 1 st , no active turtles were observed.<br />

12


Figure 11. Photo <strong>of</strong> the plastron <strong>of</strong> Box <strong>Turtle</strong> #7<br />

prior to re-engraving on June 22, 2004.<br />

Another interesting find during the 2004<br />

season was Box <strong>Turtle</strong> #7 (Figure 11).<br />

She was found on June 22 at 8:20pm<br />

digging a nest in the mowed path<br />

between the Bear Crossing and the<br />

Long Lane. Each previously marked<br />

individual has a data sheet (PNR <strong>Turtle</strong><br />

Data Sheet). Subsequent encounters or<br />

recaptures are noted on that sheet. The<br />

sheets are stored numerically in a large<br />

binder. I first flipped to the page listing<br />

#7 and Bob Mulvihill began taking<br />

measurements. It was soon clear that<br />

turtle #7 and the #7 we had in hand<br />

could not be the same. Once a turtle<br />

reaches maturity its measurements<br />

change little if any. Both #7s were<br />

clearly mature when last captured and<br />

the measurements simply did not match<br />

up. After flipping through the book, I<br />

found another #7, measurements were<br />

early the same as the #7 with a slash. As<br />

it turns out, this one with a slash through<br />

Figure 12. Map <strong>of</strong> original capture location <strong>of</strong> Box <strong>Turtle</strong> #7 and subsequent capture 37 years later.<br />

13


it like a European 7. Indeed, it was the turtle we had in hand and she was last seen in<br />

1967 along the road to Calvarly Lodge (Fig. 12). In the past 37 years she had traveled an<br />

extremely long distance, even for a female Box <strong>Turtle</strong>. From her original capture location<br />

to the 2004 location, the distance is 1400m as the crow flies. To top it all <strong>of</strong>f she was very<br />

old. In 1967 when she was first captured, Dr. Netting estimated her age to be 22 years<br />

plus. That makes her over 59 years old this year!<br />

Acknowledgments<br />

Many thanks go out to the Netting Fund and Jane Netting for funding this project.<br />

Additionally, I would like to thank the many people who supported and contributed to the<br />

project. They include: Mary Mock, who spent countless hours searching for turtles to no<br />

avail but preserved even in the worst <strong>of</strong> conditions; Robert Mulvihill for training me in<br />

the measurement techniques and showing me the important nesting areas; Walter<br />

Meshaka for entertaining all <strong>of</strong> us at <strong>Powdermill</strong> and for setting up the search method and<br />

data protocol; my husband, Mike Lanzone for assisting me and accompanying me on<br />

many walks; my stepchildren, Ashley and Jeffery Lanzone for also accompanying me;<br />

and my trusted companion Thunder who reluctantly walked with me on nearly every<br />

transect.<br />

Special thanks also goes out to all that found a turtle during the season. They include:<br />

Keith Bildstein, PhD., David Smith, PhD., Robert Leberman, Mike Lanzone, Walter<br />

Meshaka, PhD., Adrienne Lepold, Robert Mulvihill, Randy Gerrish, Cynthia Walker,<br />

Jeffery Lanzone and Thunder.<br />

14


Appendix A.<br />

Date:<br />

Location:<br />

Standardized: N Y<br />

Observer(s):<br />

Time Start:<br />

Time End:<br />

Temp (˚C) Start:<br />

Temp (˚C) End:<br />

RH%:<br />

% Cloud Cover: 0 - 25 - 50 - 75 - 100<br />

Precipitation:<br />

Time<br />

Species<br />

New<br />

Recap<br />

2004 Wood <strong>Turtle</strong> and Box <strong>Turtle</strong> Data Sheet<br />

Plastron<br />

Carapace<br />

Temp<br />

ID # Sex Length Length Width Scars/Markings Behavior GPS Location ˚C % Canopy Habitat<br />

Comment<br />

(See Back)<br />

15


Comments<br />

Scars/Markings<br />

ID #__________ ID # __________ ID #__________ ID #__________<br />

16


Appendix B. PNR <strong>Turtle</strong> Data Form<br />

17


Appendix C. <strong>Turtle</strong> Drop-<strong>of</strong>f Form<br />

Number: (Place Sticker Here)<br />

Date: Time:<br />

Exact Location (Lat/Lon):<br />

Describe Location (and/or draw map on back):<br />

Habitat (General Description):<br />

Behavior (Cirlce One): Resting - Digging - Walking - Other (Describe)<br />

Approximate Temperature (˚F):<br />

% Cloud Cover (Circle One): 0 - 25 - 50 - 100<br />

Comments:<br />

18


Appendix D. Number and species <strong>of</strong> turtles found each year from 1960 – 2004.<br />

Year Painted <strong>Turtle</strong> Wood <strong>Turtle</strong> Box <strong>Turtle</strong> Total<br />

1960 16 4 20<br />

1961 20 2 22<br />

1962 19 1 20<br />

1963 9 9<br />

1964 16 3 19<br />

1965 7 3 10<br />

1966 12 1 13<br />

1967 8 1 9<br />

1968 1 15 1 17<br />

1969 5 1 6<br />

1970 15 15<br />

1971 4 2 6<br />

1972 6 6<br />

1973 9 2 11<br />

1974 7 3 10<br />

1975 6 6<br />

1976 3 3<br />

1977 1 6 7<br />

1978 1 6 1 8<br />

1979 5 5<br />

1980 10 2 12<br />

1981 2 7 1 10<br />

1982 7 2 9<br />

1983 3 4 3 10<br />

1984 4 1 5<br />

1985 8 3 11<br />

1986 3 3 2 8<br />

1987 4 2 6<br />

1988 1 4 5<br />

1989 1 1 1 3<br />

1990 1 1 2<br />

1991 2 1 3<br />

1992 2 21 23<br />

1993 5 22 27<br />

1994 4 6 10<br />

1995 6 6 12<br />

1996 1 2 2 5<br />

1997 5 9 14<br />

1998 2 3 5<br />

1999 1 1<br />

2000 1 4 5<br />

2001 5 7 12<br />

2002 1 6 7<br />

2003 4 9 13<br />

2004 5 3 49 57<br />

Total 18 286 193 497<br />

19


Appendix E. Number <strong>of</strong> captures per year for each individual Painted <strong>Turtle</strong>, Wood <strong>Turtle</strong> and Box <strong>Turtle</strong>.<br />

Painted <strong>Turtle</strong><br />

ID 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 Total<br />

5 1 1<br />

6 1 1<br />

7 1 1<br />

7.5 1 1<br />

8 1 1<br />

9 1 1<br />

10 2 2<br />

11 1 1<br />

12 2 2<br />

13 1 1<br />

15 1 1<br />

16 1 1<br />

17 1 1<br />

18 1 1<br />

19 1 1<br />

A 1 1<br />

Total 1 1 1 2 3 3 1 1 5<br />

20


Wood <strong>Turtle</strong><br />

ID 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 Total<br />

1 1 2 3<br />

2 1 1<br />

3 1 1<br />

4 1 1 2<br />

5 1 1<br />

6 1 1<br />

7 1 1<br />

8 1 1<br />

9 1 1<br />

10 2 2<br />

11 1 1<br />

12 1 1<br />

13 1 1<br />

14 1 1<br />

15 1 1 1 1 1 5<br />

16 1 1 1 1 1 5<br />

17 1 1<br />

18 1 1<br />

19 1 1<br />

20 1 1<br />

21 1 1<br />

22 1 1<br />

23 1 1<br />

24 1 1<br />

25 1 1<br />

27 1 1<br />

29 1 2 1 4<br />

30 1 1 2<br />

31 2 2<br />

32 1 1<br />

33 1 1<br />

34 2 2<br />

36 1 1 2<br />

37 1 1<br />

38 1 1<br />

39 2 2<br />

40 1 1<br />

42 1 1<br />

45 1 1 2<br />

46 1 1<br />

47 1 1<br />

48 1 1<br />

49 1 1<br />

21


Wood <strong>Turtle</strong><br />

ID 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 Total<br />

50 1 1<br />

53 1 1<br />

54 1 1<br />

55 1 1 1 3<br />

56 1 1<br />

62 1 1 1 1 4<br />

63 1 1 1 1 4<br />

64 1 2 1 4<br />

65 1 1<br />

66 1 1<br />

67 1 1<br />

70 1 1<br />

71 1 1<br />

72 1 1<br />

73 1 3 4<br />

74 1 2 2 1 6<br />

75 2 2<br />

76 1 1<br />

77 1 1<br />

78 1 1<br />

79 1 1<br />

80 1 1 2<br />

83 1 2 3<br />

84 1 1<br />

85 1 1<br />

86 2 2<br />

90 1 1<br />

91 1 2 1 1 1 1 3 1 11<br />

92 1 1<br />

93 1 1 1 3<br />

94 2 2<br />

95 1 1<br />

96 1 1 2<br />

97 1 1<br />

100 1 1<br />

102 1 2 1 4<br />

103 1 1<br />

106 1 1 2<br />

107 1 1<br />

108 1 1<br />

109 1 1 1 2 1 1 1 1 1 2 12<br />

110 1 1<br />

111 1 2 1 1 1 6<br />

112 1 1 1 1 1 5<br />

22


Wood <strong>Turtle</strong><br />

ID 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 Total<br />

116 1 1<br />

117 1 1<br />

118 1 1 1 1 1 1 6<br />

119 2 1 1 1 1 1 2 9<br />

120 1 1<br />

121 1 1 1 3<br />

125 1 1 1 1 4<br />

126 1 1<br />

127 1 1 2<br />

130 1 1<br />

131 1 1<br />

132 1 1<br />

133 1 1<br />

134 1 1<br />

135 1 1<br />

136 1 1<br />

137 1 1<br />

138 2 1 1 1 1 3 2 1 12<br />

139 1 1<br />

140 1 1<br />

141 1 1<br />

142 1 1<br />

143 1 1<br />

150 2 2<br />

151 1 1 2<br />

152 1 1<br />

153 1 1 2<br />

154 1 1<br />

155 1 1<br />

156 1 1 2<br />

157 1 1 2 4<br />

158 1 1<br />

159 1 1 1 1 4<br />

160 1 1<br />

161 1 1 1 3<br />

162 1 1<br />

163 1 1 1 3<br />

164 1 1<br />

165 1 1<br />

166 1 1<br />

167 1 1<br />

168 1 1<br />

169 1 1<br />

170 1 1<br />

23


Wood <strong>Turtle</strong><br />

ID 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 Total<br />

171 1 1<br />

172 1 1<br />

173 1 1<br />

174 1 1<br />

175 2 2<br />

176 1 1 1 3<br />

177 1 1<br />

177B 1 1<br />

178 1 1<br />

179 1 1<br />

180 1 1<br />

181 1 1<br />

182 1 1<br />

183 1 1 1 3<br />

184 1 1 2<br />

185 1 1<br />

186 1 1<br />

187 1 1<br />

188 1 1 2<br />

189 1 1<br />

190 1 1<br />

191 1 1<br />

C 1 1<br />

D 1 1<br />

F 2 2<br />

Total 16 22 19 9 17 8 12 8 15 5 15 4 6 9 7 6 3 6 6 5 10 7 7 4 4 8 3 4 1 1 1 2 2 5 5 6 2 5 2 1 5 1 4 3 291<br />

24


Box <strong>Turtle</strong><br />

ID 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 Total<br />

1 1 1<br />

2 1 1 1 3<br />

3 1 1 2<br />

4 1 1<br />

5 1 1<br />

6 1 1<br />

7 1 1 1 2 1 6<br />

7.5 1 2 3<br />

8 2 2<br />

10 1 1 2<br />

11 1 1<br />

12 1 1<br />

15 1 1<br />

16 1 1<br />

17 1 1<br />

20 1 1 2<br />

21 1 1<br />

22 1 1 1 2 1 1 1 2 4 14<br />

23 1 1<br />

24 1 1 1 1 1 1 1 1 1 9<br />

25 1 1 1 3<br />

26 1 1 1 3<br />

27 1 1<br />

28 1 1 1 2 5<br />

29 2 2<br />

30 1 1<br />

31 1 1<br />

32 1 1<br />

33 1 1<br />

34 1 2 3<br />

35 1 1<br />

36 1 1<br />

37 1 1<br />

38 1 1<br />

39 1 1 2<br />

40 1 1<br />

41 1 1<br />

42 2 2 4<br />

44 1 1<br />

45 1 1 2<br />

45.5 1 1<br />

46 5 19 24<br />

47 2 2<br />

48 1 1 1 1 4<br />

25


Box <strong>Turtle</strong><br />

ID 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 Total<br />

49 1 1 2<br />

50 1 1 2<br />

51 1 1 2<br />

52 1 1<br />

53 1 1<br />

54 1 1<br />

55 1 1<br />

56 1 1<br />

57 1 1<br />

58 1 1<br />

59 1 1<br />

60 1 1<br />

61 1 1<br />

62 1 1 3 5<br />

63 1 2 1 4<br />

64 3 2 5<br />

65 1 1 1 4 7<br />

66 1 1 2<br />

67 1 1 2<br />

68 1 1<br />

69 1 1<br />

70 1 1 2<br />

71 1 2 5 8<br />

72 1 1<br />

73 1 1<br />

74 1 1 2<br />

75 1 1<br />

76 1 1<br />

77 2 2<br />

78 1 1<br />

79 1 1<br />

80 1 1<br />

81 1 1<br />

82 1 1<br />

D 1 1<br />

H 1 1 1 1 1 5<br />

Total 4 2 1 3 3 1 1 1 1 2 2 3 1 2 1 2 3 1 3 2 2 4 1 1 1 21 22 6 6 2 9 3 1 4 7 6 9 49 193<br />

26


References<br />

Ashely, E.P., and J.T. Robinson. 1996. Road mortality <strong>of</strong> amphibians, reptiles and other wildlife<br />

along the Long Point Causeway, Lake Erie, Ontario. Canadian Field Naturalist 110:403-412.<br />

Brooks R.J., G.P. Brown, and D.A. Gailbraith. 1991. Effects <strong>of</strong> sudden increase in natural<br />

mortality <strong>of</strong> adults on a population <strong>of</strong> common snapping turtle (Chelydra serpentine). Canadian<br />

Journal <strong>of</strong> Zoology 69: 1314-1320.<br />

Brooks, R.J., C.M. Shilton, G.P. Brown and N.W.S. Quinn. 1992. Body sixe, age distribution,<br />

and reproduction in a northern population <strong>of</strong> wood turtles (Clemmys insculpta). Canadian Journal<br />

<strong>of</strong> Zoology 70: 462-469.<br />

Compton, B.W., J.M. Rhymer, and M. McCollough. 2002. Habitat selection by wood turtles<br />

(Clemmys insculpta): an application <strong>of</strong> pair logistic regression. Ecology 83:833-843.<br />

Congdon, J.D., A.E. Dunham, and R.C. Van Loben Sels. 1993. Delayed sexual maturity and<br />

demographics <strong>of</strong> Blanding’s <strong>Turtle</strong> (Emydoidea blandingii): implications for conservation and<br />

management <strong>of</strong> long-lived organisms. Conservation Biology 7:826-833.<br />

Ernst, C.H. 2001. Some ecological parameters <strong>of</strong> the wood turtle, Clemmys insculpta, in<br />

southeastern Pennsylvania. Chelonian Conservation and Biology 4(1):94-99.<br />

Findlay, C.S. and J. Bourdages. 2000. Response time <strong>of</strong> wetland biodiversity to road construction<br />

on adjacent lands. Conservation Biology 14:86-94.<br />

Hulse, A.C., C.J. McCoy, E.J. Censky. 2001. Amphibians and Reptiles Pennsylvania. Cornell<br />

University Press. Ithaca, NY. 419 pp.<br />

Pritchard, P.C.H. 1967. Living <strong>Turtle</strong>s <strong>of</strong> the World. T.F.H. Publications. Jersey City, NJ.<br />

Saumer, R.A. and J.R. Bider. 1998. Impact <strong>of</strong> agricultural development on a population <strong>of</strong> wood<br />

turtles (Clemmys insculpta) in southern Quebec, Canada. Chelonian Conservation and Biology.<br />

3(1): 37-45.<br />

Steen D.A. and J.P.Gibbs. 2003. Effects <strong>of</strong> roads on the structure <strong>of</strong> freshwater furtle populations.<br />

Conservation Biology. 18(4): 1143-1148.<br />

Stickel, L.F. 1978. Changes in a box turtle population during three decades. Copeia 1978:221-<br />

225.<br />

Williams, E.C., Jr. and W.S. Parker. 1987. A long-term study <strong>of</strong> a box turtle (Terrapene carolina)<br />

population at Allee Memorial Woods, Indiana, with emphasis on survivorship. Herpetologica<br />

43:328-335.<br />

Yahner, R.H. 2003. Terrestrial vertebrates in Pennsylvania: status and conservation in a changing<br />

landscape. Northeastern Naturalist 10(3):343-360.<br />

27

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