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| Proasellus coxalis sensu auctorum (Crustacea, Isopoda) in de bovenloop van de Raambeek te Heist-op-den-Berg: eerste vaststelling van deze zoetwaterpissebed in België |
| Vercauteren, Th.; Wouters, K.A. (2008). Proasellus coxalis sensu auctorum (Crustacea, Isopoda) in de bovenloop van de Raambeek te Heist-op-den-Berg: eerste vaststelling van deze zoetwaterpissebed in België Antenne : tijdschrift van de Antwerpse Koepel voor Natuurstudie 2(4): 12-16 |
| In: Antenne : tijdschrift van de Antwerpse Koepel voor Natuurstudie. Danny Toelen, provinciegriffier Antwerpen: Antwerpen |
| Abstract |
The freshwater isopod Proasellus coxalis sensu auct. Has been discovered in a lowland brook, the Raambeek, at Heistop- den-Berg in N.E.-Belgium in 2005. The species name P. coxalis sensu auct. Is preferred since there is no decisive conclusion on the definition of the species (P. coxalis or P. banyulensis) and the different subspecies. The locality is situated in the upper reach of the lowland brook. At the site the brook has been transformed into a ditch. De water is very slow to stagnant, brownish, circumneutral (pH 7-7,5) and poor in oxygen (± 2,5 mg O2/l). The bottom is covered with a thick layer of litter and silt. The water vegetation is, apart from floating conglomerates of filamentuous algae, restricted to a few Iris pseudacorus and Juncus effusus. Other macro-invertebrates, besides Asellus aquaticus and P. coxalis, are: Gastropoda as Physella acuta, Galba truncatula, Radix balthica and Anisus vortex; larvae of Cloeon dipterum (Ephemeroptera), Ischnura elegans and Aeshna mixta (Odonata); Coleoptera as Hydroporus palustris, Acilius caniculatus and A. sulcatus, Rhantus suturalis; Heteroptera as Nepa cinerea, Notonecta viridis and Sigara striat and Diptera as Chaoborus pallidus, Chironomus luridus and Psectrotanypus varius. |
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