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

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5.0 Benthic and Epibenthic Invertebrates dominance of several species. Ciratulid polychaetes (Monticellina, Tharyx) have been numerical dominants since the 1950s. The pollution-tolerant polychaete Capitella capitatacomplex ranked as one of the top five dominants in the 1970s and 1983. However, it was not a numerical dominant in 1986-1987, 1994, 1996, 2000, or 2008. A decrease in the occurrence of this species complex indicates a trend of benthic habitat improvement over time. Also suggestive of habitat quality improvement was the similarity in species assemblages between inner and outer harbor basins, slips, and channels with the present study. Similar to the 2000 study, the present study showed a substantial increase in abundance from the winter to the summer survey. During 2000, the number of species also showed a similar seasonal difference; however, the numbers of species were similar among winter and summer surveys in 2008. MEC (2002) speculated that the seasonal difference in species number in 2000 may have been related to large-scale oceanographic conditions because the study following a strong El Niño-La Niña period. The similarity in species composition throughout the year during the 2008 study was similar to other historical studies. 5.3.6 Box Core and Van Veen Comparison Both box core and Van Veen samplers have been used to survey the benthic infauna community in the harbors. Historical and current baseline studies in the harbors have generally used a box corer. The same box core sampler and methodology was used for the present study as with the 2000 study. Both the box core and Van Veen sampler collect samples with a surface area of 0.1 m 2 . However, historical studies using a box corer have subdivided the sample into 0.06 m 2 and 0.04 m 2 fractions with analysis of the infauna from the larger fraction (MEC 1988, 1997, 1999; SAIC 1996, MEC 2002). This was done to provide a comparable sample to early historical studies that used 0.06 to 0.0625 m 2 coring devices (e.g., HEP 1976, 1980). In contrast, the Van Veen sampler has been adopted for use with sanitation district outfall monitoring, including the Terminal Island Water Reclamation Plant monitoring program in Los Angeles Harbor, and has been used in recent regional Bight monitoring programs. A special study was conducted to evaluate whether assessment of the benthic infauna community is substantially influenced by choice of these two types of sampling gear and analysis of samples that differ between 0.06 m 2 and 0.1 m 2 in surface area. During the summer survey, ten benthic stations were sampled with a Van Veen grab sampler in addition to the box core sampler. Count data were standardized to 0.1 m 2 for the comparison. No statistical differences in abundance or number of species were detected among gear types with t-tests (p>0.2) or Kruskal-Wallis one-way analysis of variance on ranks (P>0.9). A total of 2,677 invertebrates were collected by Van Veen and 2,160 were collected by box core (Table 5.3-7). The overall mean abundance across stations also was similar with box core (216) and Van Veen (267) samplers. A similar result was seen for number of species: 378 species were collected by Van Veen and 355 species were collected by box core and overall means across stations were 37.8 and 32.4, respectively (Table 5.3-8). Although results were more variable at some stations when taxonomic categories were compared, there was no consistent trend of higher or lower values associated with either gear type. This suggests that variability among samples related more to small-scale differences in organism abundance (e.g., patchiness) at a station level rather than to a broader trend related to gear type. Results of the special study indicate that historical and more recent assessments of the infauna community in the harbors using coring devices with surface areas ranging from 0.06 to 0.1 m 2 should be comparable. 2008 Biological Surveys of Los Angeles and Long Beach Harbors 5–7 April 2010
5.0 Benthic and Epibenthic Invertebrates 5.4 EPIBENTHIC MACROINVERTEBRATES This section presents a discussion of summary community measures (Section 5.4.1), descriptions and evaluation of species composition (Section 5.3.2), and dominant species (Section 5.3.3), a summary of spatial and temporal patterns Section 5.3.4, and a comparison of the 2008 baseline study results with historical studies (Section 5.4.5). Exotic species are addressed together with infauna in Section 5.5. Raw summary data are provided in Appendix E. 5.4.1 Community Summary Measures 5.4.1.1 Abundance A total of 7,035 macroinvertebrates representing 61 taxa was collected over the three surveys (Table 5.4-1). Five species accounted for 86% of the catch: black-spotted shrimp (Crangon nigromaculata 38.4%), ridgeback prawn (Sicyonia ingentis 16%), black-tailed bay shrimp (Crangon nigricauda), Xantus’ swimming crab (Portunus xantusii 10.6%), and Heptacarpus shrimps (8.3%). Mean catch for day sampling ranged from 2 to 93 individuals at the various stations (Table 5.4- 2), with the greatest catch in the Los Angeles main channel (Station LA4) and least at the Pier 300 shallow-water habitat (Station LA7) and Los Angeles inner harbor West Basin (Station LA 15). The overall mean catch per station during the day was 21 individuals. Mean catch per station at night was five times greater than during the day, ranging from 9 to 230 individuals (Table 5.4-2). The highest values at night were at Stations LA2, LA6, LA15, and LB3. The overall mean catch per station for night sampling was 103 individuals, nearly five times the day sampling value. The greatest difference in catch between day and night was in the Turning Basin of inner Los Angeles Harbor (Station LA15), with 10 times more invertebrates caught at night than during the day. There was no obvious pattern in macroinvertebrate abundance with depth or location. The mean combined day-night abundances ranged from 9 to 127 individuals and were greatest at Station LB3 and least at Station LA3. Total combined catch across day and night trawls was relatively higher during winter (3619) and spring (2254) surveys compared to the summer survey (878) (Appendix E). 5.4.1.2 Biomass Total wet-weight biomass of macroinvertebrates across all stations was 59.1 kg (Table 5.4-2). Mean biomass by station ranged from 0.01 to 4.49 kg for day sampling and 0.06 to 1.1 kg for night sampling. Mean biomass values were generally similar between day and night. Station LB1 in Long Beach outer harbor had the highest mean biomass values for both day and night collections. Relatively high mean biomass was collected during both day and night collections in outer harbor shallow water (Stations LA7 and LB2). There were no other obvious patterns in macroinvertebrate biomass with depth or location. 5–8 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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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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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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