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The predation impact of juvenile herring Clupea harengus and sprat Sprattus sprattus on estuarine zooplankton

Maes, Joachim and Tackx, Micky and Soetaert, Karline The predation impact of juvenile herring Clupea harengus and sprat Sprattus sprattus on estuarine zooplankton. (2005) Hydrobiologia, 540 (1). 225-235. ISSN 0018-8158

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Official URL: http://link.springer.com/article/10.1007/s10750-004-7146-3

Abstract

The consumption of estuarine copepods by juvenile herring and sprat during estuarine residency was estimated using fish biomass data and daily rations calculated from two models of feeding in fish: a bioenergetic model and a gastric evacuation model. The bioenergetic model predicted daily rations that were, on average, three times higher than those estimated by a model based on field records of stomach contents. The biomass of herring and sprat in the estuary was negatively correlated with the daily ration suggesting that the clupeid fish populations were resource-limited. Copepod production decreased towards the winter and peaked in spring and summer. The relative importance of predation changed seasonally in function of the migration pattern of herring and sprat. In the spring and the summer, in situ production of␣copepod biomass was higher than the in situ consumption by fish. During the fall and the winter, consumption exceeded production. This suggests that top–down control exerted by marine pelagic fish may be an important force structuring estuarine copepod populations.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at http://link.springer.com/ The original PDF of the article can be found at Hydrobiologia website : http://link.springer.com/article/10.1007/s10750-004-7146-3
HAL Id:hal-01514903
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Nederlands Instituut Voor Ecologie - NIOO (NETHERLANDS)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Katholieke Universiteit Leuven - KU LEUVEN (BELGIUM)
Laboratory name:
Funders:
Fund for Scientific Research – Flanders (Belgium) - Flemish government
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Deposited By: Florence Amor
Deposited On:26 Apr 2017 14:55

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