Grazing impact of filter-feeding zoobenthos in a Danish fjord
| Autor: | Poul Scheel Larsen, Mikael Jensen, Elsebeth Glob, Hans Ulrik Riisgaard, Dorthe F Seerup |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Biomass (ecology)
education.field_of_study geography geography.geographical_feature_category biology Ecology Population Fjord Aquatic Science biology.organism_classification Animal science Water column Benthos Phytoplankton Grazing education Cerastoderma glaucum Ecology Evolution Behavior and Systematics |
| Zdroj: | Riisgård, H U, Seerup, D F, Hjort, M H, Glob, E & Larsen, P S 2004, ' Grazing impact of filter-feeding zoobenthos in a Danish fjord. ', Journal of Experimental Marine Biology and Ecology, vol. 307, pp. 261-271 . https://doi.org/10.1016/j.jembe.2004.02.008 |
| DOI: | 10.1016/j.jembe.2004.02.008 |
| Popis: | The grazing impact has been evaluated of filter-feeding animals in Odense Fjord (Denmark) that is characterized by large biomass of filter feeding polychaetes (Nereis diversicolor), clams (Mya arenaria) and cockles (Cerastoderma glaucum). The filtration rate of each population (Ftot) was related to the total water volume (Vtot) in the different areas of the fjord and expressed as ‘the grazing impact’ Q=Vtot/Ftot. This quantity is related to the half-time for phytoplankton by t1/2=Q×ln 2, representing the time to reduce the concentration by a factor of 2 in the water column above the filter-feeding populations, assuming efficient vertical mixing. Based on recorded population densities it was found that the potential grazing impact exerted by the three dominating species could be expressed as Q=0.17 d and t1/2=0.12 d. This indicates a strong filter-feeder control of the phytoplankton although it should be emphasised that the potential grazing impact may only be realised when the filter-feeding zoobenthos is exposed to the whole water column by effective vertical mixing of the water on windy days. |
| Databáze: | OpenAIRE |
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