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The predation impact of herring and sprat on estuarine zooplankton in the Scheldt estuary
Maes, J.; Tackx, M.; Soetaert, K. (2002). The predation impact of herring and sprat on estuarine zooplankton in the Scheldt estuary, in: ECSA Local Meeting: ecological structures and functions in the Scheldt Estuary: from past to future, Antwerp, Belgium October 7-10, 2002: abstract book. pp. 16
In: (2002). ECSA Local Meeting: ecological structures and functions in the Scheldt Estuary: from past to future, Antwerp, Belgium October 7-10, 2002: abstract book. University of Antwerp: Antwerp. 73 + 1 cd-rom pp., meer

Beschikbaar in  Auteurs | Dataset 
Documenttype: Congresbijdrage

Trefwoorden
    Aquatic communities > Plankton > Zooplankton
    Behaviour > Migrations
    Construction
    Fauna > Aquatic organisms > Aquatic animals > Fish > Estuarine organisms > Brackishwater fish
    Fishes > Osteichthyes > Clupeiformes > Clupeidae > Clupea > Marine fishes > Herrings
    Food consumption
    Herrings
    Interspecific relationships > Predation
    Models
    Overwintering
    Population characteristics > Biomass
    Population characteristics > Population number
    Stomach content
    ANE, Noordzee [Marine Regions]; België, Schelde R. [Marine Regions]

Auteurs  Top | Dataset 

Abstract
    Every winter, young-of-the-year herring and sprat migrate to North Sea estuaries and become the dominant member of the estuarine fish assemblage, both by numbers and by biomass. These winter migrations have been related to abiotic factors (temperature and salinity), estuarine productivity and the reduced predation pressure in turbid brackish water areas. During estuarine residency, herring and sprat mainly feed on calanoid copepods. We have estimated the food consumption of zooplankton (g C m-3 day-1) by herring and sprat which overwinter in the Scheldt estuary using two models of feeding in fish: a bioenergetic model based on physiological parameters and a model based on the change in stomach contents over time. To assess the impact of fish on the copepod biomass of the brackish part of the estuary, we have developed a simple copepod biomass model and included food consumption by fish as a biomass sink. In general, the consumption of zooplankton by fish is too low to represent a major source of copepod mortality. The low impact of fish predation may be a function of the low fish biomass in spring at a time when copepod production increases.

Dataset
  • OMES: Monitoring van het zoöplankton in de Zeeschelde, meer

Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid Top | Auteurs | Dataset