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The assessment of the habitat and water quality requirements of the stone crayfish (Austropotamobius torrentium) and noble crayfish (Astacus astacus) species in the rivers from the Anina Mountains (SW Romania)

Domenii publicaţii > Biologie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Parvulescu L., Pacioglu O., Hamchevici C.

Editorial: Knowledge and Management of Aquatic Ecosystems, 401, p.12, 2011.

Rezumat:

The species Austropotamobius torrentium and Astacus astacus are two
species known in the EU directives to require deeper understanding of
their autecologic requirements before any sustainable conservation effort
could be successfully applied. Therefore, the paper aims to analyze
the occurrence of these two species of crayfish in the Anina Mountains
(Romania) in relation to several physical-chemical indicators measured
on site. The results suggest that the anthropogenic impacts registered
in some of the sampling sites (e.g. organic pollution and river bed modification)
might have triggered the disappearance of both species from the
areas of the water sheds situated downstream villages and towns, deforestation
sites and sewage treatment plants. The analysis suggest that both
species might have similar ecologic requirements, with a BMWP score of 8
(out of a possible 10), therefore good indicators of pristine aquatic environments
and with a possible toleration to pollution but only up to a moderate
level. Nevertheless, the lack of cohabitation of the populations of both
species at a local scale was discussed along with two possible explaining
hypotheses: behavioral exclusion or different times and/or modalities of
dispersal history.

Cuvinte cheie: Astacus astacus, Austropotamobius torrentium, crayfish, distribution

URL: http://dx.doi.org/10.1051/kmae/2010036