Changes in dominance of copepods off Baja California during the 1997-1999 El Niño and La Niña.
Open accessAbstract
Changes in copepod species composition were analyzed from September-October 1997 to April 1999.The community changed substantially between El Niño 1997-1998 and La Niña 1998-1999, following trends in oceanographic conditions.The warm period was characterized by a community rich in equatorial, tropical/subtropical and warm-temperate cosmopolites, but almost lacking in subarctic copepods.The widespread presence of Undinula vulgaris appears to be due to the strong poleward jet that developed in the coastal region during autumn 1997.Although the coastal jet dispersed in early 1998, the strong influence of equatorial water continued, as indicated by the record abundance of Subeucalanus subtenuis, an equatorial species in oceanic eutrophic waters.The community during the cold period comprised very few copepods with equatorial affinity, few tropical/subtropical and warm-temperate cosmopolites, and an increased relative importance of subarctic species.Copepods typical for the California Current (transition zone group) displayed no significant differences between the extremes of El Niño/La Niña during the fall and winter seasons.A strong La Niña increase in the transition zone group (particularly in Calanus pacificus) was observed until spring 1999, and was probably related to a record coastal upwelling during the La Niña conditions at this time.El Niño 1997-1998 had a greater influence on equatorial species in the region than the previous El Niño event of 1957-1959.
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Subeucalanus subtenuis, Paraeucalanus attenuatus, Clausocalanus farrani, and Scolecithrix danae are typical of equatorial and sub-tropical waters, and Subeucalanus pileatus is characteristic of coastal waters.
“typical species in equatorial and sub-tropical waters (McGowan, 1971;Björnberg, 1981;Jiménez and Lavaniegos, 2004) and by Subeucalanus pileatus, a species characteristic of coastal waters (Jiménez and Lavaniegos, 2004).”
From Epipelagic copepod distributions in the eastern equatorial Pacific during the weak La Niña event of 2001 (2011) · cites this paper as Jiménez and Lavaniegos, 2004
The Species with limited distribution section classifies Subeucalanus subtenuis and Pareucalanus attenuatus as equatorial oceanic species and Subeucalanus pileatus as neritic; the Comparison section also describes S. pileatus along the coast and Scolecithrix danae as tropical/subtropical. Our copy mentions Clausocalanus only at genus level, not Clausocalanus farrani, so it does not support that species-specific part of the claim. (LLM, conf=0.86)
Experimental — accuracy not yet measuredOncaea venusta, Temora discaudata, and Subeucalanus crassus are typical of tropical and oceanic waters, and Subeucalanus crassus is characteristic of equatorial waters.
“These species are typical of tropical and oceanic waters (Björnberg, 1981;Jiménez and Lavaniegos, 2004), particularly S. crassus, which is characteristic of equatorial waters (McGowan, 1971).”
From Epipelagic copepod distributions in the eastern equatorial Pacific during the weak La Niña event of 2001 (2011) · cites this paper as Jiménez and Lavaniegos, 2004
In “Species with broad distribution” (page not provided), the paper places Temora discaudata in a tropical/subtropical group but explicitly calls it neritic, not oceanic. The appendix lists Oncaea venusta and Subeucalanus crassus as present without classifying their typical waters. The equatorial-water characterization of S. crassus is cited to McGowan, not to this paper. (LLM, conf=0.86)
Experimental — accuracy not yet measuredOncaea conifera, Centropages velificatus, Pleuromamma abdominalis, and Rhincalanus nasutus are characteristic of cold subtropical waters and have been recorded from Peruvian and Chilean waters.
“all these species are characteristic of cold subtropical waters and have been recorded from Peruvian and Chilean waters (Björnberg, 1981;Hsieh et al., 2004;Jiménez and Lavaniegos, 2004;López and Palomares, 2006;Ayón et al., 2008).”
From Epipelagic copepod distributions in the eastern equatorial Pacific during the weak La Niña event of 2001 (2011) · cites this paper as Jiménez and Lavaniegos, 2004
The species table (p. 153) records Rhincalanus nasutus and Pleuromamma abdominalis off Baja California, and Appendix 1 lists Oncaea under the spelling “confiera.” The paper does not establish that all four named species characterize cold subtropical waters or have been recorded off Peru and Chile; its Discussion mentions those coasts in connection with a different species, Subeucalanus subtenuis. (LLM, conf=0.85)
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Cites
Biological and Chemical Response of the Equatorial Pacific Ocean to the 1997-98 El Niño
Chavez, F. P., Strutton, P. G., Friederich, G. E., Feely, R. A., Feldman, G. C., Foley, D. G., & McPhaden, M. J. (1999) · Science · doi:10.1126/science.286.5447.2126 · Cited by 642 · cited 1× · see citing works
“Nutrients and chlorophyll decreased sharply in the equatorial Pacific (Chavez et al. 1999) and relatively strongly in central California (Chavez et al. 2002), Oregon (Corwith & Wheeler 2002), and the Gulf of Alaska (Whitney & Welch 2002).”
BackgroundLong-term changes in pelagic tunicates of the California Current
Lavaniegos, B. E., & Ohman, M. D. (2003) · Deep Sea Research Part II: Topical Studies in Oceanography · doi:10.1016/s0967-0645(03)00132-2 · Cited by 158 · see citing works
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Research works printed but not linked: 5
- Boyd CM, Smith SL, Cowles TJ (1980) Grazing patterns of copepods in the upwelling system off Peru. Limnol Oceanogr 25(4):583-596
- Fleminger A (1975) Geographical distribution and morpho- logical divergence in American coastal-zone planktonic copepods of the genus Labidocera. In: Cronin LE (ed) Estuarine research Vol. 1: Chemistry, biology and the estuarine system. Academic Press, New York, p 392-419
- Miller AJ, Cayan DR, Barnett TP, Graham NE, Oberhuber JM (1994) The 1976-1977 climate shift of the Pacific Ocean. Oceanography 7(1):21-26
- Palomares R, Suárez-Morales E, Hernández-Trujillo S (1998) Catálogo de los copépodos (crustácea) pelágicos del Pací- fico Mexicano. Centro Interdisciplinario de Ciencias Mari- nas/Colegio de la Frontera Sur, México Palomares-García R, Martínez-López A, De-Silva-Dávila R, Funes-Rodríguez R, Carballido-Carranza MA, Avendaño- Ibarra R, Hinojosa-Medina A, López-Ibarra GA (2003) Bio- logical effects of El Niño 1997-98 on a shallow subtropical ecosystem: Bahía Magdalena, Mexico. Geofisica Interna- cional 42(3):455-466
- Suárez-Morales E, Franco-Gordo C, Saucedo-Lozano M (2000) On the pelagic copepod community of the central Mexican tropical Pacific (Autumn, 1990). Crustaceana 73(6): 751-761
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Tutasi, P., Palma, S., & Cáceres, M. (2011) · Scientia Marina · doi:10.3989/scimar.2011.75n4791 · Cited by 6 · see citing works
- Authors
- Jiménez-Pérez, L., & Lavaniegos, B.
- Affiliations
- Centro de Investigación Científica y de Educación Superior de Ensenada (MX)
- Venue
- Marine Ecology Progress Series
- Publisher
- Inter-Research Science Center
- Published
- 2004
- Volume
- 277
- Pages
- 147-165
- ISSN
- 0171-8630 (ISSN-L)
- 1616-1599
- OpenAlex
- W2015219257
- Cited by
- 30
- References
- 2
- Citations by year
- 2025: 1 · 2024: 1 · 2023: 1 · 2022: 2 · 2020: 1 · 2019: 1 · 2018: 1 · 2017: 3 · 2016: 2 · 2014: 4 · 2012: 1
- FWCI
- 1.97
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Marine Ecology Progress Series (publishedVersion)
- Funders
- National Science Foundation
- Consejo Nacional de Ciencia y Tecnología
- Inter-American Institute for Global Change Research
- National Oceanic and Atmospheric Administration
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine Biology and Ecology Research
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
- Keywords
- copepods, species composition, El Niño, La Niña, Baja California, California Current, Undinula vulgaris, Calanus pacificus, coastal upwelling, oceanographic conditions
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