Loss of genetic integrity and biological invasions result from stocking and introductions of Barbus barbus: Insights from rivers in England.

Antognazza, C.M., Andreou, D., Zaccara, S. and Britton, R.J., 2016. Loss of genetic integrity and biological invasions result from stocking and introductions of Barbus barbus: Insights from rivers in England. Ecology and Evolution, 6 (5), pp. 1280-1292.

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DOI: 10.1002/ece3.1906

Abstract

Anthropogenic activities, including the intentional releases of fish for enhancing populations (stocking), are recognized as adversely impacting the adaptive potential of wild populations. Here, the genetic characteristics of European barbel Barbus barbus were investigated using 18 populations in England, where it is indigenous to eastern-flowing rivers and where stocking has been used to enhance these populations. Invasive populations are also present in western-flowing rivers following introductions of translocated fish. Two genetic clusters were evident in the indigenous range, centered on catchments in northeast and southeast England. However, stocking activities, including the release of hatchery-reared fish, have significantly reduced the genetic differentiation across the majority of this range. In addition, in smaller indigenous rivers, populations appeared to mainly comprise fish of hatchery origin. In the nonindigenous range, genetic data largely aligned to historical stocking records, corroborating information that one particular river (Kennet) in southeast England was the original source of most invasive B. barbus in England. It is recommended that these genetic outputs inform management measures to either restore or maintain the original genetic diversity of the indigenous rivers, as this should help ensure populations can maintain their ability to adapt to changing environmental conditions. Where stocking is considered necessary, it is recommended that only broodstock from within the catchment is used.

Item Type:Article
ISSN:2045-7758
Uncontrolled Keywords:European barbel; Genetic differentiation; Indigenous; Invasive; Nonindigenous
Subjects:UNSPECIFIED
Group:Faculty of Science and Technology
ID Code:23207
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:03 Mar 2016 14:46
Last Modified:03 Mar 2016 14:46

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