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

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report Recommendations No changes to the fisheries monitoring program are recommended at this time. The next monitoring is scheduled to occur in Year 5, with sampling events in October 2010, and January, April, and July 2011. 1.4. BENTHIC MONITORING Introduction The Monitoring Plan calls for benthic invertebrate monitoring to be initiated in Year 2 (October 2007 to September 2008) and to be repeated in Years 5 and 10 following the opening of the FTB to the ocean. The Year 2 sampling was conducted in January and July of 2008. The objective of the benthic monitoring task in the Monitoring Plan is to characterize the marine invertebrate food resources available to birds and fish, as well as provide an index of general habitat quality in the basin. Methodology Infauna Three benthic sampling stations were established in the FTB: one along the north eastern shore, one along the western shore, and one in the southern portion of the basin (Figure 1-11). Three replicate collection points were established for each station. At each replicate point, a sediment core was collected from the + 0.3-m (+1-foot) NAVD elevation and from the -0.6-m (–2-foot) NAVD elevation. These elevations will be referred to in feet throughout this section. The elevations were estimated based on the water level compared to a known elevation at the east Water Control Structure in January 2008. During the second sampling in July 2008, the tidal range in the basin had been altered due to tidal muting caused by the accumulated flood shoal in the basin inlet, and the point of core collection had to be adjusted accordingly to best approximate the true tidal elevation. The sediment cores were collected using a 15-cm diameter corer inserted to a sediment depth of 15 cm, and rinsed through a 1.0-mm sieve. The sediment area sampled by each core was 0.018 m 2 . Core collection unavoidably captured the biota occurring on the surface of the sampled core, as well as in the water column for the –2-foot NAVD samples. Therefore, the collected samples could include epibenthic and open water organisms along with the infauna. Although captured fish were removed from the samples, all other organisms were retained and worked up along Sieving a sediment core. with the infauna. Organisms from each sample were placed in containers, preserved in a buffered 10% formalin:seawater solution, and transported to the laboratory for subsequent analysis. After approximately one week, organisms collected from the benthic cores were transferred in the laboratory into 70% isopropyl alcohol. All individuals in each replicate sample were identified to the lowest practical taxonomic level, counted, and the wet weight measured. Wet weight was determined by transferring the sample, including alcohol, onto a paper towel and blotting quickly to remove excess liquid from the animals. Organisms were then transferred to a tared weighing dish and weighed to the Merkel & Associates, Inc. 55
Benthic Sta 1 Rep2 Benthic Sta 1 Rep1 Benthic Sta 3 Rep1 Benthic Sta 3 Rep2 Benthic Sta 3 Rep3 Benthic Sta 1 Rep3 Full Tidal Basin Benthic Sta 2 Rep1 Benthic Sta 2 Rep2 Benthic Sta 2 Rep3 0 100 200 400 600 800 Meters Benthic sampling stations Bolsa Chica Lowlands Restoration Project Figure 1-11 Merkel & Associates, Inc.
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