appendix b final 2008 biological surveys of los angeles and long ...

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3.0 Adult and Juvenile Fishes and bat rays at night, representing nearly 85% of all fish biomass from the night surveys. Although more northern anchovy, bat rays, and Pacific sardines were collected in night samples compared to day, this pattern was primarily different for topsmelt, with higher numbers of this species being collected in day samples. Mean fish biomass by station is presented in Table 3.3-2. The highest mean biomass (day and night samples combined) was observed at outer harbor Stations LB3 (mean = 9233) and LB7 (mean = 9231). The lowest mean biomass was reported at inner harbor Station LB14 (mean = 130). Mean biomass at most other stations was highly variable and ranged from 286 to 5,761 (Table 3.3-2). Mean biomass was not statistically higher at night compared to day surveys (all surveys combined). However, total biomass was significantly higher (p = 0.006) at night compared to day samples. Seasonal differences in total biomass were also observed, with more fish biomass collected during night surveys in summer (July) compared to all other surveys (Figure 3.3-2), although these differences were not statistically significant. Total biomass was similar in winter (January) and spring (April). 3.3.1.3 Number of Species A total of 20 species were collected with the lampara net during all surveys, night and day combined (Table 3.3-1). Slightly more total species (all surveys combined) were collected during night surveys (19) compared to day (12). In contrast, individual station means for number of species were generally two times higher at night compared to day (Table 3.3-2). The total number of species collected varied from a low of 1 species, collected only during day surveys at several stations, to a high of 15 species collected at Station LA7 at night (Table 3.3- 2). Seasonal differences in the number of species are presented in Figure 3.3-2. More species were collected at night during spring (April) and summer (July) surveys than any other sampling quarter. The lowest number of species (6) was observed in day samples during winter (January) and spring surveys. 3.3.1.4 Diversity and Dominance Diversity indices provide information about community composition by combining species richness (i.e., the number of species present) and relative abundances of different species (equitability) into one measure. There are several methods to calculate diversity, but two commonly used indices, Shannon-Weiner and Margalef, were used in the current study (Table 3.3-3). In addition, Dominance values were calculated and are also presented in Table 3.3-3. For Shannon-Weiner indices, values vary from 0 for communities with only a single taxon to high values for communities with many taxa, each with few individuals. The Margalex Index incorporates the number of species and total number of individuals. The Dominance Index computes the number of species that account for 75% of the total abundance. Shannon-Wiener values varied greatly among stations and between day and night surveys (Table 3.3-3). The values were generally higher during night surveys at most stations compared to day and at shallow-water stations. Shannon-Wiener values ranged from a low of 0.00 at several stations during the day to a high of 1.63 observed during the day at Station LA7. Margalef values followed similar trends, with night values being consistently higher than day. Margalef values ranged from a low of 0.00 to a high of 1.98 at Station LA7 (night survey). Station LA7 is a shallow-water station and had the highest Shannon-Wiener and Margalef values. 2008 Biological Surveys of Los Angeles and Long Beach Harbors 3–5 April 2010
3.0 Adult and Juvenile Fishes Dominance is defined as the number of species accounting for 75% of the total abundance at a specific station. Dominance values during all surveys ranged between 1 (one species accounted for 75% of the total abundance) and 3 (three species accounted for 75% of the total abundance), with most stations averaging 1 (Table 3.3-3). In general, higher dominance values (2 and 3) were found at shallow-water stations. 3.3.2 Dominant and Selected Species Four of the 20 species collected over all surveys and stations in 2008 comprised over 98% of the total catch: northern anchovy, topsmelt, California grunion, and Pacific sardine (Table 3.3-1). All of these species are schooling fishes that spend most of their lives in the harbor environment. As described above, northern anchovy was the most abundant species collected, and represented 87% of the total lampara catch and nearly 57% of the total biomass (Table 3.3-1). This species was collected at every sampling station and during every survey quarter (day and night samples). Average size for all measured northern anchovy ranged between 3 and 14 cm, with most individuals between 7 and 11 cm (Figure 3.3-3). No spatial trends in fish sizes were evident. Topsmelt were the second most abundant fish species collected during lampara surveys and represented over 7% of the total catch and 9% of the total biomass (Table 3.3-1). Similar to northern anchovy, this species was collected during all survey quarters and at every sampling location (day and night samples). Sizes ranged between 4 and 32 cm, with most individuals between 6 and 12 cm (Figure 3.3-3). Average size for all measured topsmelt ranged between 8 and 13 cm, with most fishes falling into the 10 or 11 cm size class. No spatial trends in fish sizes were evident. Other dominant pelagic species in terms of abundance included California grunion and Pacific sardine, each representing approximately 1.9% of the total lampara catch and 1.2% and 3% of the total biomass, respectively (Table 3.3-1). California grunion had a bimodal size distribution, with peaks at 6-7 cm and 13-14 cm (Figure 3.3-3). Although there was a peak in 10 cm size class Pacific sardine, their size distribution was also generally bimodal, with both small (4-8 cm) and large (9-15 cm) represented. 3.3.3 Summary of Spatial and Temporal Variations A total of 20 species represented by 81,084 individuals, with a combined weight of 656 kg, was collected at 19 stations over 3 sampling quarters (seasons) in Los Angeles and Long Beach harbors. In contrast to typical seasonal patterns for pelagic harbor fishes where summer is the peak of abundance (MEC 2002), the total number of individuals collected in this study using the lampara net was higher in winter (January) than in summer (August) (Figure 3.3-2). Significant differences were observed between night and day samples, with nearly ten times more fish collected at night. Differences in diurnal catch were primarily due to large night catches of northern anchovy (Table 3.3-1). No spatial patterns of abundance were apparent. This is likely due to the mobile habits of most common pelagic fishes, which spend most of their lives moving in and around various locations in and outside the harbors. Temporal biomass patterns were similar to the abundance trends described above, with significant day-night differences in biomass. Seasonal patterns in biomass were also observed, with values lowest in winter (January) and highest in summer (July) for both day and night 3–6 2008 Biological Surveys of Los Angeles and Long Beach Harbors April 2010
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APPENDIX B FINAL 2008 BIOLOGICAL SU
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FINAL 2008 BIOLOGICAL SURVEYS OF LO
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Page 26 and 27: 1.0 Introduction 1.0 INTRODUCTION T
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4.0 Ichthyoplankton Table 4.3-5. We
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4.0 Ichthyoplankton Table 4.3-6. Se
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4.0 Ichthyoplankton Table 4.5-1. Ar
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4.0 Ichthyoplankton LA05 LA14 2D St
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5.0 Benthic and Epibenthic Inverteb
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CHAPTER 6 RIPRAP BIOTA
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6.0 Riprap Biota diver collection m
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6.0 Riprap Biota relatively small b
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6.0 Riprap Biota sea cucumber (Para
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6.0 Riprap Biota polychaete worms.
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6.0 Riprap Biota Table 6.3-1. Mean
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6.0 Riprap Biota Figure 6.2-1. Ripr
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7.0 Kelp and Macroalgae 7.0 KELP AN
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7.0 Kelp and Macroalgae the laborat
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7.0 Kelp and Macroalgae sediment us
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7.0 Kelp and Macroalgae Overall, ou
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7.0 Kelp and Macroalgae pose a sign
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7.0 Kelp and Macroalgae Figure 7.2-
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CHAPTER 8 EELGRASS
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8.0 Eelgrass distribution of eelgra
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8.0 Eelgrass adjacent to most trans
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8.0 Eelgrass load on the plants was
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8.0 Eelgrass (Table 8.3-5), based o
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8.0 Eelgrass surveys. No eelgrass b
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8.0 Eelgrass Areas containing eelgr
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8.0 Eelgrass Seasonal patterns amon
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8.0 Eelgrass 2002) inferred that th
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8.0 Eelgrass Table 8.3-2. Spring 20
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8.0 Eelgrass Table 8.3-4. Fall 2008
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8.0 Eelgrass Table 8.3-12. Oceanic
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8.0 Eelgrass Figure 8.3-2. Eelgrass
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8.0 Eelgrass Figure 8.3-6. Spatial
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9.0 Birds 9.0 BIRDS 9.1 INTRODUCTIO
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9.0 Birds changes in species number
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9.0 Birds the Brown Pelican populat
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9.0 Birds 9.4.2.10 9.4.2.11 9.4.2.1
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9.0 Birds 9.5.1 Distribution and Ab
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9.0 Birds discussed in Section 9.4.
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9.0 Birds Angeles Harbor. The relat
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9.0 Birds Table 9.4-1. Percent Comp
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9.0 Birds Table 9.4-3. Nest Numbers
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9.0 Birds Table 9.5-2. Species Comp
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9.0 Birds Table 9.5-4. Percent Comp
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9.0 Birds Table 9.6-1. Historical C
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9.0 Birds 70 12000 60 10000 50 40 3
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9.0 Birds 3500 shallow water sandy
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9.0 Birds 40 35 30 riprap aerial Nu
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9.0 Birds Number Observed 3500 3000
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9.0 Birds Figure 9.5-1. Total numbe
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9.0 Birds Number of Individuals 400
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9.0 Birds 7000 Mean Number of Indiv
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CHAPTER 10 MARINE MAMMALS
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10.0 Marine Mammals Gray whales dif
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10.0 Marine Mammals This page inten
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11.0 References 11.0 REFERENCES Abb
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11.0 References Dennison, W.C. and
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11.0 References Jacques, D.L., C.S.
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11.0 References North, W.J. 1983. S
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APPENDIX A STATION LOCATIONS
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Appendix A Station Coordinates (NAD
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Appendix B (A) Temperature (°C), S
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APPENDIX C FISHES
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Appendix C Table C-1. Combined Fish
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Appendix C LA01 LA02 LA03 LA04 LA05
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Appendix C Table C-3. Otter Trawl C
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Appendix C Table C-5. Otter Trawl B
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Appendix C Table C-7. Otter Trawl B
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Appendix C Table C-8. Lampara Catch
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Appendix C Table C-10. Lampara Catc
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Appendix C Scientific Name Table C-
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Appendix C Table C-14. Beach Seine
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Appendix D Table D-1. Ichthyoplankt
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Appendix D fish eggs (undeveloped)
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Appendix D fish eggs unid. unidenti
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fish eggs unid. unidentified fish e
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Appendix D Eggs Oligocottus / Clino
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Appendix D Eggs Rhinogobiops nichol
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Appendix D Juvenile Eggs Heterostic
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Appendix D Eggs Liparis spp. snailf
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Appendix D Juvenile Eggs Heterostic
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Appendix D Table D-11. Ichthyoplank
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APPENDIX E INFAUNA
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Appendix E Taxon LA-1 LA-10 LA-11 L
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Appendix E Protothaca laciniata Tax
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Appendix E Taxon LA1 LA2 LA3 LA4 LA
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Appendix E Table E-4. Otter Trawl,
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Appendix E Taxon LA1 LA2 LA3 LA4 LA
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Appendix E Octopus sp. 1 Philine sp
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Appendix E This page intentionally
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Appendix F Table F-1. Total Abundan
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Appendix F LARR-1 LARR-2 LARR-3 LAR
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APPENDIX G KELP AND MACROALGAE
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Appendix G Date Survey Site Observe
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Appendix G Species T1 T2 T3 T4 T5 T
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Appendix H APPENDIX H-1 AVIAN ECOLO
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Appendix H Table H-1. Avian Ecologi
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Appendix H GUILD 8 - UPLAND BIRDS G
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Appendix H APPENDIX H-2 NUMBER OF I
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Appendix H Table H-2. December A 20
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Appendix H Table H-3. December B 20
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Appendix H Table H-4. January A 200
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Appendix H Table H-5. January B 200
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Appendix H Table H-6. February A 20
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Appendix H Table H-7. February B 20
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Appendix H Table H-8. March A 2008
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Appendix H Table H-9. March B 2008
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Appendix H Table H-10. April A 2008
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Appendix H Table H-11. May A 2008 S
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Appendix H Table H-13. July A 2008
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Appendix H Table H-15. August B 200
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Appendix H Table H-16. September A
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Appendix H Table H-17. September B
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Appendix H Species Totals Zones 1 2
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Appendix H Species Totals Zones 1 2
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Appendix H Zones Species Totals 1 2
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Appendix H Zones Species Totals 1 2
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Appendix H Date ELEGANT TERN — OB
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APPENDIX I MARINE MAMMALS
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Appendix I Common Survey Station/ N
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Appendix I Common Name Survey Type
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Appendix I This page intentionally
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