. Bulletin. Science. NEW MARINE INVERTEBRATES AT THE CHANNEL ISLANDS 187. JAN FEB MAR ââ¢â Los Coronados - âoâ Anacapa â APR MAY JUN JUL AUG SEP OCT NOV DEC Santa Catalina --râ San Clemente âvâ Santa Barbara ââ â San Nicolas Santa Cruz -^^ Santa Rosa â*â San Miguel â&â Pt Conception Fig. 1. Mean monthly sea surface temperatures at the eight Channel Islands for the period 1982- 1999. Data were taken from National Weather Service (Monterey) oceanographic analyses. Bight experienced above normal sea temperatures for yr, from May 1997 to August 1998 (CoastWatch Bulletins 1997-2000). By Sep
. Bulletin. Science. NEW MARINE INVERTEBRATES AT THE CHANNEL ISLANDS 187. JAN FEB MAR ââ¢â Los Coronados - âoâ Anacapa â APR MAY JUN JUL AUG SEP OCT NOV DEC Santa Catalina --râ San Clemente âvâ Santa Barbara ââ â San Nicolas Santa Cruz -^^ Santa Rosa â*â San Miguel â&â Pt Conception Fig. 1. Mean monthly sea surface temperatures at the eight Channel Islands for the period 1982- 1999. Data were taken from National Weather Service (Monterey) oceanographic analyses. Bight experienced above normal sea temperatures for yr, from May 1997 to August 1998 (CoastWatch Bulletins 1997-2000). By September 1998, the El Nino abruptly switched to La Nina, which caused cooler temperatures also for â yr, from September 1998 to March 2000 (CoastWatch Bulletins 1997-2000). This paper presents new distributional records for shallow-water subtropical in- vertebrates at the California Channel Islands during and after the 1997-1998 El Nino. New and unusual fish records at the Channel Islands are reported in a com- panion paper by Richards and Engle (this volume). Post-El Nino records are im- portant because some species that recruit during the warm-water period are slow- growing and only become evident after attaining larger sizes. Periodic surveys allow determination of growth and survivorship of these exotic species. The invertebrate observations we report here include six subtropical species seen for the first time in California waters as well as six other species that have newly appeared (or have notably increased abundances) at one or more of the eight Channel Islands (Table 1). We have noted some southern California mainland sightings, but have not at- tempted to include all new mainland records for these species. Methods The eight Channel Islands off the southern California coast have been surveyed periodically since 1980 in cooperative studies by the Tatman Foundation's Chan- nel Islands Research Program (CIRP) and Channel Islands National Park (CINP) Ke
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