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Exotic fish species and their impacts on small coastal lagoons in Southern California. (Abstracts).

Both freshwater and estuarine exotic (non-native) fish species impact small souther California coastal lagoons. In the seven small lagoons (0.5-50 hectares) on Marine Corps Base Camp Pendleton, the larger of these lagoons are more impacted by exotics because they have larger drainages upstream that support freshwater exotic, primarily mosquitofish, sunfishes and black basses, and catfishes. The smaller of these lagoons have fewer upstream sources and more seasonal drying upstream that impede downstream movement by exotics. Marine invasion has been documented for two exotic species, yellowfin goby and striped bass, both particularly facilitated by the latest El Nino-La Nina cycle. The El Nino coincided with a large increase in yellowfin goby recruitment in the Santa Margarita estuary and the only occurrence of this goby in several smaller systems. Increased numbers of striped bass arrived later during the following La Nina. There appears to be a strong negative correlation of mosquitofish with tidewater goby s uccess at some sites. The federally endangered tidewater goby appears to do best in the smallest sites without mosquitofish. The striped bass were few in number and apparently had little impact and the increase of yellowfin gobies was relatively short lived, as the influx of other southern native forms, that their effect was relatively fleeting.

Camm C. Swift (1) and Dan C. Holland (2)
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Author:Swift, Camm C.; Holland, Dan C.
Publication:Bulletin (Southern California Academy of Sciences)
Article Type:Brief Article
Geographic Code:1U9CA
Date:Aug 1, 2002
Words:218
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