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|Title: ||Interactions between invasive crayfish and native river shrimp|
|Authors: ||Banha, F.|
Anastácio, Pedro M.
|Issue Date: ||2011|
|Citation: ||Banha, F.; Anastácio, P.M.Interactions between invasive crayfish and native river shrimp, Knowledge and Management of Aquatic Ecosystems, 401, 17, 1-12, 2011.|
|Abstract: ||In the south of Portugal there are only two species of strictly freshwaterdecapods: the native freshwater shrimp Atyaephyra desmarestii and the exotic crayﬁsh Procambarus clarkii. The aim of this study is to understand if the exotic crayﬁsh acts as river shrimp predator and if both species have the same type of microhabitat. We performed laboratory experiments to study predation and conducted ﬁeld work in the river Sorraiato verify the microhabitat distribution of both species. Laboratory experiments demonstrated signiﬁcant predation on river shrimp for crayﬁsh witha cephalothorax length (CT) over 24 mm. The average daily consumption increases with crayﬁsh CT to a maximum of 0.8 shrimps at 44 mm. Fieldwork conﬁrmed that both species share the same microhabitats although with small differences e.g. on the water quality variables such as conduc-tivity and the percentage of oxygen saturation. These microhabitats are shallow pools with abundant aquatic vegetation with no preference for the type of substrate. In the ﬁeld, both crayﬁsh density and its cephalothorax length are negatively correlated with shrimp densities. In conclusion, P. clarkii can predate A. desmarestii and the major impacts are expected at high densities of large sized crayﬁsh.|
|Appears in Collections:||PAO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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