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

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report Muted Tidal Basins The Muted Tidal Basins were sampled with the small beach seine as described in the methods section above, with variations in effort each quarter based on conditions within each basin. The area and water depth sampled was highly variable between quarters due to fluctuating water levels. In some cases, unvegetated shoreline was not exposed to pull the net up onto at the sampling site, so the net had to be lifted up prior to shoreline vegetation, which reduced sampling of fish right along the shoreline. Hauls were often filled with dead plant debris from decaying pickleweed that was permanently inundated by the introduction of tidal waters or heavy rainfall. Beach seining the central MTB. Six fish species were captured in the west MTB and seven in the central MTB (Table 1-8). Both arrow and shadow gobies were captured in the west MTB. Topsmelt and juvenile atherinids were the most common species in both basins. California killifish were abundant in October, and various gobies were captured in all quarters. Both bay and barred pipefish were observed. Only one other barred pipefish was captured in 2008 at Bolsa Chica (at Station 2 in the FTB). A small juvenile striped mullet was captured in the far east end of the west muted tidal basin. In 2008 the central MTB was not directly open to the FTB for any length of time, just periodically for a few minutes or up to one day. Table 1-8. Summary of fish abundance (# of individuals) in the Muted Tidal Basins in 2008. April 2008 July 2008 October 2008 Species West MTB Central MTB West MTB Central MTB West MTB California Killifish 14 68 Topsmelt 2 76 26 168 301 Atherinid, unidentified juvenile 120 Bay Pipefish 1 Barred Pipefish 1 Staghorn Sculpin 3 Striped Mullet 1 Lonjaw Mudsucker 1 2 5 Cheekspot Goby 12 3 Arrow/Shadow Goby complex 8 1 Total Abundance (individuals) 145 77 30 185 376 Area Sampled (m 2 ) 126 155 310 170 129 The water quality conditions at the time of each sampling were presented in Table 1-7. Salinity in the west MTB was similar to or just slightly higher than the FTB in each quarter, while salinity in the central MTB was considerable higher, measuring 54.4 ppt in July and from 78-78 ppt in October. Both MTBs were notably warmer than the FTB in July and October, due to their shallow depth and more limited circulation (particularly in the central MTB). Dissolved oxygen was lowest in the central MTB in July (4.2 mg/L). The mass of the fish captured is presented in Table 1-9. These data show that although gobies made up only 4% of the total count, they represented over 16% of the total biomass, due primarily to the large size of the longjaw mudsuckers (Gillichthys mirabilis) captured. Merkel & Associates, Inc. 49
Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report Table 1-9. Summary of fish mass (g) in the Muted Tidal Basins in 2008. April 2008 July 2008 October 2008 Species West MTB Central MTB West MTB Central MTB West MTB California Killifish 33.5 14.7 Topsmelt 8.0 70.2 12.8 207.7 342.3 Atherinid, unidentified juvenile 12.0 Bay Pipefish 2.4 Barred Pipefish 0.1 Staghorn Sculpin 10.7 Striped Mullet 0.3 Lonjaw Mudsucker 4.8 13.1 117.8 Cheekspot Goby 2.8 1.1 Arrow/Shadow Goby complex 2.9 0.4 Total Mass (g) 36.4 75.0 28.7 242.3 475.2 Area Sampled (m 2 ) 126 155 310 170 129 Muted Pocket Marsh The Muted Pocket Marsh was sampled with the large beach seine and was generally found to be low in diversity but high in abundance of species foraged on by many birds. A total of nine species were captured over the year (Table 1-10). Topsmelt and California killifish were the most abundant year round, reaching their peaks in July. Staghorn sculpin and longjaw mudsucker were occasionally abundant. Diamond turbot was the only flatfish captured. Both arrow and shadow gobies were captured. Four non-native yellowfin gobies were captured in April. Beach seining the Muted Pocket Marsh. Table 1-10. Summary of fish abundance (# of individuals) in the Muted Pocket Marsh in 2008. Species January 2008 April 2008 July 2008 October 2008 California Killifish 6 47 879 88 Topsmelt 190 82 591 293 Staghorn Sculpin 1 18 Yellowfin Goby 4 Longjaw Mudsucker 1 58 Cheekspot Goby 10 Arrow/Shadow Goby complex 18 11 1 Diamond Turbot 3 5 Total Abundance (individuals) 200 185 1,539 382 Area Sampled (m 2 ) 1,301 1,206 938 1,301 The mass of fish captured in the Muted Pocket Marsh is presented by species in Table 1-11. Topsmelt accounted for 84% of the total mass during the year. Although abundance of all fish was greatest in July, the total mass was highest in October with the capture of larger, more mature topsmelt. The diamond turbot captured in January were very small juveniles (20-27 mm standard length), while the five captured in April were larger juveniles, ranging in standard lengths from 34-75mm. Merkel & Associates, Inc. 50
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