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

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8.0 Eelgrass 8.3.2.2 Pier 300/Seaplane Lagoon Area Spring (March/April) 2008 The Pier 300 and Seaplane Lagoon area eelgrass beds occur in three physically distinct locations (Figures 8.3-4 and 8.3-5). The first, “Seaplane Lagoon,” is an old Seaplane anchorage that is located farthest from the harbor entrance. The second location, “Mitigation Site,” is adjacent to Pier 300 and is the shallow water habitat mitigation site constructed as part of the Pier 400 project, was planted in the winter of 2002/2003, and was augmented with additional sediment and planting efforts in 2007 (Merkel & Associates 2008). This site is comprised of dredge fill with rock revetments that created very shallow water habitat, suitable for establishing an eelgrass bed. The third area, “Terminal Site,” is adjacent to a container shipping terminal with a rock dike to the west and a small sandy beach to the north (Figure 8.3-4). The Mitigation site, Seaplane Lagoon site, and Terminal Site contained a total of 30.7 acres of eelgrass based on the March 2008 side-scan surveys. The Mitigation Site contained 15.4 acres of eelgrass, with 4.8 acres mapped within the Seaplane Lagoon, and 10.4 acres of eelgrass within the Terminal Site (Table 8.3-11). The Mitigation Site eelgrass bed was dispersed, but with patches that appeared evenly spaced, as indicated by the data for transects M1 and M2 (Table.8.3-5). Associated algal species Chaetomorpha spp. and Gracillaria spp. that were observed at the Cabrillo Beach area were also common within the Mitigation Site, near rocks or shell piles, in conjunction with healthy patches of primarily large (2-3 ft) eelgrass plants growing in uniform mud substrate. The majority of the eelgrass bed was in central portion of the Mitigation Site (-6 ft to -8ft MLLW), but individual plants were observed throughout most of the site. The lowest densities were noted on the far north portion of the site adjacent to the rock jetty. Substrate was variable throughout the Mitigation Site with evidence of scouring and patches of course shell fragments observed throughout the site, but most prominent near the margins. Turion counts at the Mitigation site in the spring varied widely from 0 to 6 turions per 1/16m 2 quadrat and typified the patchy nature of the eelgrass bed associated with this site (Table 8.3- 5). Divers performed two transects within the Mitigation Site in April, beginning in the center of eelgrass beds identified during side-scan sonar surveys. Mean turion density (± standard deviation) was low within the Mitigation Site and the Seaplane Lagoon compared to the nearby Terminal Site (Table 8.3-5). Two areas adjacent to the surveyed transects, but not represented in quadrat counts, had slightly higher densities based on diver observations (10 turions per quadrat). Observations within the general Mitigation Site indicated dense and persistent red algae (Gracillaria spp. and Prionitis spp.) growing within the eelgrass bed and commonly intertwined with large mature eelgrass plants. Diver observations of eelgrass density, spatial consistency, and associated algae provided important information utilized for sonar density mapping interpretation. The Seaplane Lagoon bed contained 4.8 acres of eelgrass during the April survey and consisted of small fragmented linear patches from -1 ft to -7ft MLLW. Plants were sparse and comprised of a mixture of small (6 in) and large (2-3 ft) individuals. The eelgrass beds within the Seaplane Lagoon were variable, such that the low density habitat likely grades between a defined eelgrass bed (at least one plant/m 2 ) under the SCEMP (NMFS 1991) and potential eelgrass habitat (less than one plant/m 2 ). Substrate within the Seaplane Lagoon consisted of fine mud. In the spring turion counts at the Seaplane Lagoon were relatively low compared to other sites, thereby illustrating the spatial variability and limited nature of the eelgrass bed in this area 2008 Biological Surveys of Los Angeles and Long Beach Harbors 8–7 April 2010
8.0 Eelgrass (Table 8.3-5), based on one diver transect within the Seaplane Lagoon in April. Investigations of areas immediately outside the transect footprint found similar eelgrass distribution and density, with no plants observed deeper than -7 ft MLLW. Poor visibility and debris along the bottom made conditions difficult for identifying associated invertebrates or fish, although they were present along the transect. The Terminal Site eelgrass bed encompassed 10.4 acres during the April survey and consisted of a well-established linear bed along the sandy beach and along the western jetty (Figure 8.3-4). Plants were comprised of a mixture of 10-20% small (4-6 inches) and the remainder large (2-3 ft) individuals. Substrate within the site consisted of a sand mud mixture and plants had a low epiphytic load of diatom film. Red algae (e.g., Gracillaria spp.) was not observed at either the Terminal Site or Seaplane Lagoon and appeared associated with areas characterized by coarse sediments or shell fragments. Divers performed one transect within the Terminal Site in April. Turion counts varied from 0 to 9 turions per 1/16m 2 quadrat and displayed the least variability and greatest density of all the Pier 300 area transects (Table 8.3-5). Eelgrass densities were uniform at the beginning of the transect and became gradually patchy near the end point. Investigations of areas outside the transect footprint found similar eelgrass distribution and density with no plants observed deeper than -11 ft MLLW. Round stingrays (Urolophus halleri), topsmelt (Atherinops affinis), sand bass (Paralabrax nebulifer), and spiny lobster (Panulirus interuptus) were among the main fish and invertebrate species observed during quadrat counts. September 2008 The general distribution of eelgrass within the Pier 300/Seaplane Lagoon area remained similar to observations from the spring surveys. Eelgrass coverage within all three Pier 300/Seaplane Lagoon sites totaled 28.6 acres (Figure 8.3-4) in September, a decrease of less than 5% from the April survey. The Mitigation Site bed contained 15.1 acres of eelgrass in September, nearly unchanged from the April 2008 survey. Individual eelgrass plants remained a composition of small (
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APPENDIX B FINAL 2008 BIOLOGICAL SU
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FINAL 2008 BIOLOGICAL SURVEYS OF LO
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Table of Contents 3.4.3 Summary of
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Table of Contents 8.2.1 Aerial Phot
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Table of Contents Table 3.4-2. Tabl
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Table of Contents Table 8.3-3. Tabl
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Table of Contents Figure 6.2-1. Rip
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Table of Contents This page intenti
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Executive Summary otter trawls to s
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Executive Summary Van Veen) and ana
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Executive Summary which was collect
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1.0 Introduction 1.0 INTRODUCTION T
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1.0 Introduction 1.4 STUDY OBJECTIV
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1.0 Introduction Historical compari
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1.0 Introduction Figure 1.1-2. Map
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CHAPTER 2 WATER QUALITY
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2.0 Water Quality The CTD was deplo
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2.0 Water Quality Outer Harbor area
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2.0 Water Quality Table 2.2-1. Wate
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2.0 Water Quality Figure 2.2-1. Wat
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2.0 Water Quality This page intenti
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3.0 Adult and Juvenile Fishes 3.0 A
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3.0 Adult and Juvenile Fishes speci
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3.0 Adult and Juvenile Fishes and b
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3.0 Adult and Juvenile Fishes sampl
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3.0 Adult and Juvenile Fishes No si
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3.0 Adult and Juvenile Fishes croak
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3.0 Adult and Juvenile Fishes gobie
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3.0 Adult and Juvenile Fishes Table
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3.0 Adult and Juvenile Fishes Figur
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CHAPTER 4 ICHTHYOPLANKTON
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4.0 Ichthyoplankton studies (Horn a
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4.0 Ichthyoplankton more likely to
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4.0 Ichthyoplankton The results of
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4.0 Ichthyoplankton Table 4.3-1. To
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4.0 Ichthyoplankton Table 4.3-2. To
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4.0 Ichthyoplankton Table 4.3-4. We
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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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Page 182: CHAPTER 8 EELGRASS
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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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