Direct evidence of tidally oriented behavior of the copepod Eurytemora affinis in the Seine estuary

Ecological Research - Tập 26 Số 4 - Trang 773-780 - 2011
François G Schmitt1, David Devreker2,1, Gaël Dur3,1, Sami Souissi1
1Laboratoire d'Océanologie et de Géosciences Université de Lille 1, UMR CNRS LOG 8187 BP 80 28 Avenue Foch Wimereux 62930 France
2Laboratoire d'Ecotoxicologie Milieux Aquatique (LEMA), Faculté des Sciences et Techniques Université du Havre BP 540 Le Havre Cedex 76058 France
3Institute of Marine Biology, National Taiwan Ocean University, 2 Pei-Ning Rd, Keelung, 202 Taiwan, ROC

Tóm tắt

Abstract

The calanoid copepod Eurytemora affinis dominates the zooplankton communities in most northern hemisphere estuaries. A recurrent behavior noticed in several estuaries suggests that this species maintains its horizontal position through vertical migration. In order to investigate this behavioral strategy in detail, we sampled E. affinis nauplii, copepodids and adults at high frequency at a fixed point in the low salinity zone of the Seine estuary. We took water samples in sub‐surface and near bottom during a 12‐ and 50‐h tide cycle, in May 2002 and May 2004, respectively. Since nauplii have weak swimming capabilities compared to copepodid and adult stages, we proposed here to consider them as passive particles. The variation of the relative abundances of nauplii to older stages regarding the vertical position was therefore viewed as direct evidence of the behavior of later stages. We showed that copepodids and adults tried to stay close to the bottom during the ebb, were re‐suspended in the water column 1 h after the low tide during the maximum current velocity, and then vertically migrated back to the bottom layer when current velocity decreased. We also showed that copepodids behaved as adults, with only a lower velocity, taking more time to go near the bottom.

Từ khóa


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Ecological Research

Tập 26 Số 4

773-780

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