Hopkins Marine Station Student Paper

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Title: Recruitment of intertidal barnacle species in an El Nino year: linking El Nino oceanography to barnacle larval settlement
Student Author(s): Kaplan, Isaac
Faculty Advisor(s): Watanabe, James
Pages: 37
Location: Final Papers Biology 175H
Date: June 1998
Abstract: I monitored recruitment of the barnacles Balanus glandula and Chthamalus spp. to the intertidal zone at three sites in central California. The sampling period was April 27th-May 28th 1998, during the strong 1997-8 El Nino. The results showed that one large pulse of recruitment occurred at Waddell Beach during a relaxation of coastal upwelling in April. Two smaller recruitment events occurred at Asilomar Beach during two periods of relaxation in May. There was a significant correlation of recruitment with sea surface temperature at two moored buoys (r^2=.593, r^2=.604) and salinity (r^2=-.593). Buoy observations of north wind velocity and sea surface temperature showed that the two periods of reduced upwelling in May totaled nine days. Only five months during April through June 1988-1997 had nine or more days without upwelling-favorable north winds. This suggests that one effect of the El Nino on the central coast may have been to decrease upwelling-favorable winds.