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

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report Infauna density (indiv/m 2 ) Infauna density (indiv/m 2 ) 40,000 30,000 20,000 10,000 0 40,000 30,000 20,000 10,000 0 600 January 2008 July 2008 Infauna density at -2-feet NAVD Station 1 Station 2 Station 3 Infauna density at +1-foot NAVD January 2008 July 2008 Station 1 Station 2 Station 3 Infauna biomass at -2-feet NAVD Infauna biomass (g/m 2 ) Infauna biomass (g/m 2 ) 500 400 300 200 100 0 600 500 400 300 200 100 0 January 2008 July 2008 Station 1 Station 2 Station 3 Infauna biomass at +1-foot NAVD January 2008 July 2008 Station 1 Station 2 Station 3 Figure 1-12. Mean infauna density (individuals/m 2 ) and biomass (g/m 2 ) in January and July 2008 by station and tidal elevation Merkel & Associates, Inc. 61
Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report Epifauna The epifauna documented in the 1-m quadrat assessment in January 2008 are presented in Table 1-17 (all replicates combined) and included only a few bivalves and tunicates at Station 1 and no animals at Stations 2 or 3, although several Navanax inermis were observed outside of the quadrat at the –2-foot elevation at Station 2. In the July 2008 quadrat sampling, considerably more epifaunal invertebrates were observed, with Station 2 at the –2-foot elevation having the most animals (Table 1-17). At Stations 1 and 3 there were large groups of Bulla gouldiana and egg masses present just outside of the quadrats. Also noted in July were large numbers of Hemigrapsus oregonensis and Pachygrapsus crassipes throughout the riprap surrounding the FTB. Bulla gouldiana and egg masses. The epifaunal invertebrates captured in the fishing nets in 2008 are presented in Table 1-18 by station and sampling quarter (all replicates combined). Considerably more diversity was recorded than was seen in the quadrat assessment due the greater area and depth range sampled. Species occasionally seen in high numbers were the pink shrimp Pandalus sp., the small kelp humpback shrimp (Hippolyte clarki) commonly associated with eelgrass, A. ventricosus size classes in the FTB. various tunicates, B. gouldiana, and Argopecten ventricosus. The scallop A. ventricosus was captured during every quarter in the FTB and in the full range of sizes from newly settled to fully-grown. Six non-native species were identified (as indicated in the table by an asterisk), including the Japanese mussel (Musculista senhousia), a highly invasive non-native mussel present in many California bays and estuaries and detected during the first benthic monitoring in October 2007 (Merkel & Associates 2008). Though not measured by the benthic monitoring program, the development of the invertebrate community on the shoreline was dramatic during 2008, with the loose rocks that are scattered over the mud shoreline of the FTB becoming heavily encrusted by the nonnative Mediterranean mussel (Mytilus galloprovincialis), the limpet Crepidula fornicata, native oysters (Ostreola conchaphila), and barnacles (Balanus sp.). These rocks were left behind following the completion of the FTB construction and have added complexity to the large mudflats of the basin. Octopus (Octopus bimaculoides), navanax, and nudibranchs were often observed in the pooled water at the base of the FTB riprap and in the shoreline eelgrass beds. Encrusting molluscs on the FTB mudflats. Merkel & Associates, Inc. 62
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Western Snowy Plover Nesting at Bol
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2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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