New data on the introduction of the invasive signal crayfish Pacifastacus leniusculus (Dana, 1852) (Crustacea: Decapoda) in Galicia (NW Iberian Peninsula)

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Published: 25-04-2017

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Sergio Silva
Departamento de Zooloxía, Xenética e Antropoloxía Física, Facultade de Bioloxía, Universidade de Santiago de Compostela
Spain
http://orcid.org/0000-0001-8626-0257
Pablo Outón
Departamento de Zooloxía, Xenética e Antropoloxía Física, Facultade de Bioloxía, Universidade de Santiago de Compostela
Spain
David José Nachón
Departamento de Zooloxía, Xenética e Antropoloxía Física, Facultade de Bioloxía, Universidade de Santiago de Compostela
Spain
Pablo Gómez-Sande
Departamento de Zooloxía, Xenética e Antropoloxía Física, Facultade de Bioloxía, Universidade de Santiago de Compostela
Spain
Javier Sánchez-Hernández
Departamento de Zooloxía, Xenética e Antropoloxía Física, Facultade de Bioloxía, Universidade de Santiago de Compostela
Spain
Rufino Vieira-Lanero
Estación de Hidrobioloxía “Encoro do Con”, Universidade de Santiago de Compostela
Spain
Fernando Cobo
Departamento de Zooloxía, Xenética e Antropoloxía Física, Facultade de Bioloxía, Universidade de Santiago de Compostela Estación de Hidrobioloxía “Encoro do Con”, Universidade de Santiago de Compostela
Spain
Vol 24 (2017), Scientific articles
Submitted: 01-03-2017 Accepted: 17-04-2017 Published: 25-04-2017
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Abstract

The non-native signal crayfish Pacifastacus leniusculus (Dana, 1852) has successfully been established in many catchments of Europe, causing detrimental impacts on both native flora and fauna. The aim of this paper was to report the anthropogenic introduction of P. leniusculus and its ectosymbionts (family Branchiobdellidae) in the River Tambre (NW Spain). Seventy one individuals of P. leniusculus were captured in the Barrié de la Maza reservoir in November 2016. The presence of several age classes, including young of the year individuals, and ovigerous females suggests that the population is already established and viable. Most individuals (96%) presented branchiobdellidans and 4% exhibited white spots probably caused by a virus. Melanised spots caused by the oomycete Aphanomyces astaci (Schikora, 1906) (crayfish plague) were not found in this sample. This population is expected to disperse through the River Tambre basin. The Tambre population may also be a source of individuals for new introductions in the region, where currently no P. leniusculus populations are known at a minimum radio of 150 km in straight line. Therefore, immediate management and preventive actions should be pursued to control the dispersion and growth of this population and to avoid new introductions (e.g. ban of crayfish fishing).

Keywords:

Astacidae, Branchiobdellidae, distribution, invasive species, River Tambre, Galicia, Spain

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