Seasonal occurrence and hatching success of benthic eggs of calanoid copepods in the Bahía Blanca Estuary, Argentina

Abstract

The seasonal abundance and hatching success of calanoid benthic eggs were examined during the coexistence of Acartia tonsa and Eurytemora americana in the Bahía Blanca Estuary (BBE). The dormancy behaviour of eggs extracted from surface sediment layers was tested by simulating seasonal conditions during incubation. There was a greater abundance of benthic eggs of E. americana (≤8.68×10⁶ eggs m⁻²) than of A. tonsa, the latter consistently showing low egg abundance (≤0.8×10⁶ eggs m⁻²). The emergence of most E. americana nauplii occurred at 17°C after the experimental warming phase (refractory phase of 280 days), confirming the diapause character of these eggs. The emergence of the first A. tonsa nauplii from initial cold season samples occurred at 9–12°C after 60–70 days of incubation. However, a 180-day delay in hatching at temperatures ≥15°C was also observed in A. tonsa eggs from the last sampling days of the cold season, thus suggesting an intermediate behaviour between diapause and quiescence. The benthic egg bank in the inner zone of the BBE provides a temporary reservoir for both key copepods, thus contributing in their survival.

Keywords:

• Resting calanoid eggs
• diapause eggs
• Eurytemora americana
• Acartia tonsa
• benthic egg bank
• dormancy strategy

Published in collaboration with the Institute of Marine Research, Norway

Published in collaboration with the Institute of Marine Research, Norway

Acknowledgements

This study is based partly on the PhD thesis of the first author. It was supported by a grant PICT1713-2006 and a postgraduate fellowship (CONICET). We are grateful to the staff of the Instituto Argentino de Oceanografía and Chemistry Laboratory for their collaboration. Finally, we thank three anonymous reviewers for their valuable comments, which contributed greatly to the improvement of the paper.

Notes

Published in collaboration with the Institute of Marine Research, Norway