Densité et biomasse des unionidés (Mollusca) de l'étang de Virelles (Hainaut, Belgique) ; Density and biomass of unionid mussels in the Virelles pond (Hainaut, Belgium)
peer reviewed ; In the course of the autumn 1986, the pond of Virelles (Hainaut, Belgium) has been dried out. Unionid mussels (Anodonta cygnea and A. piscinalis) were then sampled on a total area of 1,408 m² (about 0.2% of the pond area). We estimated their density was nearly 875 ind./ha and their biomass 204 kg fresh weight/ha. The length frequency distribution of the mussels is quite surprising since the larger individuals are the most numerous. We think this situation is derived from a higher predation rate on small individuals. Musk rats (Ondatra zibethicus) and large carps (Cyprinus carpi... Mehr ...
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| Dokumenttyp: | journal article |
| Erscheinungsdatum: | 1988 |
| Verlag/Hrsg.: |
Royal Belgian Zoological Society
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| Schlagwörter: | Anodonta / Belgium / density / biomass / Virelles pond / Life sciences / Zoology / Sciences du vivant / Zoologie |
| Sprache: | Französisch |
| Permalink: | https://search.fid-benelux.de/Record/base-29355786 |
| Datenquelle: | BASE; Originalkatalog |
| Powered By: | BASE |
| Link(s) : | https://orbi.uliege.be/handle/2268/111582 |
peer reviewed ; In the course of the autumn 1986, the pond of Virelles (Hainaut, Belgium) has been dried out. Unionid mussels (Anodonta cygnea and A. piscinalis) were then sampled on a total area of 1,408 m² (about 0.2% of the pond area). We estimated their density was nearly 875 ind./ha and their biomass 204 kg fresh weight/ha. The length frequency distribution of the mussels is quite surprising since the larger individuals are the most numerous. We think this situation is derived from a higher predation rate on small individuals. Musk rats (Ondatra zibethicus) and large carps (Cyprinus carpio, mean weigth 5.5 kg; mean biomass 86 kg/ha) probably enconnter less difficulties in handling the smaller mussels than the larger ones.