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Environmental regulation of the estuarine copepods Acartia tonsa and Eurytemora americana during coexistence period

Published online by Cambridge University Press:  30 July 2008

Mónica S. Hoffmeyer*
Affiliation:
Instituto Argentino de Oceanografía (CONICET-UNS), PB 804, B8000FWB Bahía Blanca, Argentina Facultad Regional Bahía Blanca, Universidad Tecnológica Nacional, 11 de Abril 461, 8000 Bahía Blanca, Argentina
Anabela A. Berasategui
Affiliation:
Instituto Argentino de Oceanografía (CONICET-UNS), PB 804, B8000FWB Bahía Blanca, Argentina
Débora Beigt
Affiliation:
Instituto Argentino de Oceanografía (CONICET-UNS), PB 804, B8000FWB Bahía Blanca, Argentina
María C. Piccolo
Affiliation:
Instituto Argentino de Oceanografía (CONICET-UNS), PB 804, B8000FWB Bahía Blanca, Argentina Departamento de Geografía, Universidad Nacional del Sur, San Juan y 12 de Octubre, 8000 Bahía Blanca, Argentina
*
Correspondence should be addressed to: Mónica S. Hoffmeyer, Instituto Argentino de Oceanografía (CONICET-UNS), PB 804, B8000FWB Bahía Blanca, Argentina email: bmhoffme@criba.edu.ar

Abstract

The seasonal dynamics of Acartia tonsa and the invader Eurytemora americana were analysed in relation to the environmental variability occurring from April to November in the Bahía Blanca Estuary. Twice a month, the abundance of eggs, nauplii, copepodites and adults was examined and some environmental variables were recorded. Multivariate statistics (CCA) was applied to analyse the data of variables. Acartia tonsa eggs and nauplii diminished from April–May and they were almost absent between June and September, although a small larval peak could be detected from the end of July to October. All the stages of this species increased in number through spring. Eurytemora americana was registered as from June and only nauplii larvae were observed, with a peak increase during September. Copepodites and adults were observed as from July, increasing in number until peaking at the end of September. The number of all stages of this species decreased abruptly, the whole population disappearing from the plankton. The A. tonsa developmental stages were most positively correlated with temperature, photoperiod and other light variables whereas those of E. americana showed positive correlations with chlorophyll-a and salinity. The gradients of the main environmental factors likely give rise to a certain niche separation facilitating the coexistence of the two copepod populations within the period studied.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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