Trophic coupling across the St. Lawrence River estuarine transition zone
Winkler, G.; Dodson, J.J.; Bertrand, N.; Thivierge, D.; Warwick, V.F. (2003). Trophic coupling across the St. Lawrence River estuarine transition zone. Mar. Ecol. Prog. Ser. 251: 59-73
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599, more
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| Keywords |
Aquatic communities > Plankton > Zooplankton
Developmental stages > Larvae > Fish larvae
Production
Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries
Copepoda [WoRMS]; Mysis Latreille, 1802 [WoRMS]; Neomysis Czerniavsky, 1882 [WoRMS]
Marine/Coastal |
| Authors | | Top |
- Winkler, G.
- Dodson, J.J.
- Bertrand, N.
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- Thivierge, D.
- Warwick, V.F.
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| Abstract |
The objective of this study was to analyze the coupling between trophic levels of the frontal area of the St. Lawrence estuary transition zone, which is the site of an estuarine turbidity maximum (ETM) and is an important nursery area for the juveniles of Atlantic tomcod Microgadus tomcod and rainbow smelt Osmerus mordax. A detailed series of measurements and sampling were conducted over 6 tidal cycles within the frontal zone. An inverse relationship between the abundance of the 63 μm-net plankton and that of autotrophs indicated the impact of zooplankton grazing on autotrophic biomass, which was largely composed of diatoms. Within the 63 μm-net plankton, nauplii, copepodites and the adults of Eurytemora affinis appeared to be the most important grazers of autotrophs. First-order calculations illustrated that the primary production observed in the ETM is capable of supporting the biomass of this copepod and that its grazing pressure is capable of reducing autotrophic biomass in the brackish waters of the transition zone. Heterotrophic species were asmall component (<20%) of total microplankton in the freshwater samples, but dominated the total community biomass at higher salinities. This shift towards heterotrophic dominance implies a spatialcoupling between upstream autotrophic production and downstream consumer processes. Analysis of stomach contents showed that the calanoid copepod E. affinis was the primary food source forlarval fishes and mysids, although the combined ingestion rates of the 2 fish species are unlikely to have any impact on copepod standing stocks. By far the most important predators of the zooplanktonare Neomysis americana and Mysis stenolepis. Estuarine circulation and associated entrapment processes ultimately control the trophic relationships and gradients in community structure withinthe ETM. |
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