A brief massive aggregation of pelagic swimming crabs Euphylax dovii (Decapoda: Portunidae) at Cocos Island, Costa Rica coincides with onset of El Niño event
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| Format: | Artículo científico |
| Language: | en |
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Universidad de Costa Rica
2020
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| author | Alex Hearn |
| author_facet | Alex Hearn |
| contents | A brief massive aggregation of pelagic swimming crabs Euphylax dovii (Decapoda: Portunidae) at Cocos Island, Costa Rica coincides with onset of El Niño event Alex Hearn Todd Steiner Randall Arauz Biología El Niño Brachyura mass aggregation Eastern Tropical Pacific Introduction: Sporadic aggregations of decapod crustaceans can occur for various reasons and in some cases their drivers are poorly understood. Objective: Here, we present our observations of an apparently rare massive aggregation of pelagic swimming crabs, Euphylax dovi. Methods: During a research cruise at Cocos Island (5°32’34” N, 87°05’06” W), we encountered large numbers of E. dovii in surface waters in the evenings of May 6-7, 2015, some of which we collected for identification prior to returning to the water. Results: Crabs of both sexes were identified, yet no females were bearing eggs. Crabs aggregated around a small dinghy used for scientific surveying from 4pm through 8pm each evening, and around our research vessel throughout the night, presumably attracted by the lights. On both occasions, the aggregation dissipated around dawn. Crabs were not seen prior to or after the two nights. Conclusions: Sea surface temperatures at Cocos during this period were markedly warm, with no perceptible thermocline down to at least 40 m, coinciding with the onset of the 2015 El Niño event. It appears that the aggregation formed in response to El Niño conditions, yet the biological reason behind it remains unknown. 2020 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44968285021 https://www.redalyc.org/journal/449/44968285021/ https://www.redalyc.org/journal/449/44968285021/html/ https://www.redalyc.org/journal/449/44968285021/44968285021.epub https://www.redalyc.org/journal/449/44968285021/movil 10.15517/RBT.V68IS1.41196 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.68 |
| format | Artículo científico |
| id | redalyc_44968285021 |
| institution | Redalyc |
| language | en |
| publishDate | 2020 |
| publisher | Universidad de Costa Rica |
| spellingShingle | A brief massive aggregation of pelagic swimming crabs Euphylax dovii (Decapoda: Portunidae) at Cocos Island, Costa Rica coincides with onset of El Niño event Alex Hearn Biología El Niño Brachyura mass aggregation Eastern Tropical Pacific A brief massive aggregation of pelagic swimming crabs Euphylax dovii (Decapoda: Portunidae) at Cocos Island, Costa Rica coincides with onset of El Niño event Alex Hearn Todd Steiner Randall Arauz Biología El Niño Brachyura mass aggregation Eastern Tropical Pacific Introduction: Sporadic aggregations of decapod crustaceans can occur for various reasons and in some cases their drivers are poorly understood. Objective: Here, we present our observations of an apparently rare massive aggregation of pelagic swimming crabs, Euphylax dovi. Methods: During a research cruise at Cocos Island (5°32’34” N, 87°05’06” W), we encountered large numbers of E. dovii in surface waters in the evenings of May 6-7, 2015, some of which we collected for identification prior to returning to the water. Results: Crabs of both sexes were identified, yet no females were bearing eggs. Crabs aggregated around a small dinghy used for scientific surveying from 4pm through 8pm each evening, and around our research vessel throughout the night, presumably attracted by the lights. On both occasions, the aggregation dissipated around dawn. Crabs were not seen prior to or after the two nights. Conclusions: Sea surface temperatures at Cocos during this period were markedly warm, with no perceptible thermocline down to at least 40 m, coinciding with the onset of the 2015 El Niño event. It appears that the aggregation formed in response to El Niño conditions, yet the biological reason behind it remains unknown. 2020 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44968285021 https://www.redalyc.org/journal/449/44968285021/ https://www.redalyc.org/journal/449/44968285021/html/ https://www.redalyc.org/journal/449/44968285021/44968285021.epub https://www.redalyc.org/journal/449/44968285021/movil 10.15517/RBT.V68IS1.41196 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.68 |
| title | A brief massive aggregation of pelagic swimming crabs Euphylax dovii (Decapoda: Portunidae) at Cocos Island, Costa Rica coincides with onset of El Niño event |
| topic | Biología El Niño Brachyura mass aggregation Eastern Tropical Pacific |
| url | https://www.redalyc.org/articulo.oa?id=44968285021 https://www.redalyc.org/journal/449/44968285021/ https://www.redalyc.org/journal/449/44968285021/html/ https://www.redalyc.org/journal/449/44968285021/44968285021.epub https://www.redalyc.org/journal/449/44968285021/movil |