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Spring abundance and distribution of the ctenophore Pleurobrachia pileus in the Seine estuary: advective transport and diel vertical migration
Wang, Z.; Thiebaut, E.; Dauvin, J.C. (1995). Spring abundance and distribution of the ctenophore Pleurobrachia pileus in the Seine estuary: advective transport and diel vertical migration. Mar. Biol. (Berl.) 124(2): 313-324. hdl.handle.net/10.1007/BF00347135
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Peer reviewed article  

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Keywords
    Abundance; Distribution; Pleurobrachia pileus (O. F. Müller, 1776) [WoRMS]; ANE, France, Seine Estuary [Marine Regions]; Brackish water

Authors  Top 
  • Wang, Z.
  • Thiebaut, E., more
  • Dauvin, J.C.

Abstract
    Several sets of plankton and hyperbenthos samples were collected from the Seine estuary in late May-early June of 1991, 1992 and 1994, and the abundance, size-frequency, horizontal and vertical distribution, and short-term fluctuations of Pleurobrachia pileus (O.F. Müller, 1776) were determined. In the Seine estuary, P. pileus was more abundant than reported for any other European shallow waters. Its depth-averaged density was 33 individuals m-3 in 1991 and 32 individuals m-3 in 1992, with a maximum density of 808 individuals m-3. The ctenophores displayed passive tidal advection and active diel vertical migration. In the outer estuary, high abundances were observed around low tide, and diel vertical migration was very pronounced. However, many individuals remained aggregated near the bottom at all times. In spring, the distribution of P. pileus coincided with the 33 and 150‰ S isohalines, with high abundances on the marine side of the estuary. It is suggested that aggregation of ctenophores near the bottom and diel vertical migration play an important role in the retention of P. pileus in the estuary. Two schemes of P. pileus life cycle in the Bay of Seine are proposed.

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