2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report nearest 0.0001 gram using an analytical balance. All samples were returned to the alcohol solution and archived for future reference. Because the benthic monitoring program was intended to broadly characterize the communities of infaunal organisms within the FTB of Bolsa Chica, species level classification was not deemed necessary. Rather, data were assembled into logical, higher-order taxonomic groups. Epifauna The epibenthic invertebrate sampling program made use of both a focused quadrat investigation and a more expansive field effort undertaken as a part of the fish community surveys. For the quadrat survey, a 1-m 2 quadrat was tossed randomly at each of the sampling points, and at the two tidal elevations (+1 foot and -2 feet NAVD), utilized for the infauna coring (Figure 1-11). All epifaunal organisms present on the surface of the substrate within the quadrat boundary were identified and counted. Macroalgae present in the quadrat were also recorded. Epibenthic quadrat sampling. Additionally, during the completion of fish studies described above the incidental by-catch of epibenthic invertebrates was collected, identified, and counted to further enhance the detection of epibenthic organisms and characterize their distribution, composition, and rough abundance within the FTB. Because of the incidental nature of these collections, density information was not generated from the count data. Only representatives of those organisms that could not be positively identified in the field were collected for subsequent laboratory taxonomy and voucher collections. These individuals were preserved in a 10% formalin:seawater mixture and transported to the laboratory for identification. After approximately one week, organisms were transferred into 70% isopropyl alcohol and identified. Results Infauna In January 2008, nine phyla were collected in the infauna cores, with most taxa represented at both elevations. Table 1-13 presents the mean density of infauna for the three replicates at each station and elevation. Polychaetes were the dominant taxa, accounting for 61% of the total abundance. Tanaids and bivalves were the second and third most abundant (21% and 4% of the total, respectively). Total density was higher at the –2-foot elevation than at the +1-foot elevation, driven primarily by greater numbers of polychaetes, amphipods, and tanaids at the lower elevation. Table 1-14 presents the mean biomass (g/m 2 ) of infauna for the three replicates at each station and elevation in January. Infaunal biomass in January was dominated by bivalves, gastropods, and polychaetes at all stations. Merkel & Associates, Inc. 57
Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report Table 1-13. Mean density of infauna (individuals/m 2 ) in January 2008. -2-feet NAVD +1-foot NAVD Phylum Taxa Station 1 Station 2 Station 3 Station 1 Station 2 Station 3 Annelida Class Polychaeta 1,733 2,806 7,119 659 2,392 829 Arthropoda Class Ostracoda 19 Order Amphipoda 697 132 603 75 75 Order Decapoda 38 38 19 Order Mysidacea 19 Order Tanaidacea 1,394 38 2,881 282 716 Cnidaria Class Anthozoa 19 113 19 38 Echinodermata Class Holothuroidea 19 490 19 19 Subclass Ophiuroidea 19 Foraminifera Phylum Foraminifera 19 Mollusca Class Bivalvia 113 207 56 565 169 Class Gastropoda 38 282 19 264 Nemertea Phylum Nemertea 75 19 38 151 94 Phoronida Phylum Phoronida 75 19 19 Platyhelminthes Class Turbellaria 19 19 38 Total Mean Density all Taxa (individuals/m 2 ) 4,162 4,200 10,734 1,676 3,107 1,733 Merkel & Associates, Inc. 58
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2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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