NDLI: Human-mediated contact zone between endemic and invasive Barbus species (Osteichthyes: Cyprinidae) in a regulated lowland river: genetic inferences and conservation implications

Content Provider	Taylor & Francis Online
Author	Britton, R. Zaccara, S. Antognazza, C. M. Buonerba, L. Crosa, G.
Abstract	Genetic surveys of the endemic Padanian barbel Barbus plebejus (Osteichthyes: Cyprinidae) were completed on the lowland Adda River, a heavily regulated Italian Alpine river in which the European Barbus barbus is invasive. Both Barbus species are of the large fluvio-lacustrine ecophenotype and thus they share habitats in the river. Mitochondrial (N = 35) and nuclear (N = 256) DNA sequences were completed with the aim of estimating the extent and genetic consequences of the B. barbus invasion. The phylogenetic analyses, based on cyt b mtDNA, S7 ribosomal protein and growth hormone (GH) nuclear genes, revealed 59 haplotypes as B. plebejus and 37 as B. barbus. Genetic diversity values (H and π) and the mismatch distribution analyses indicated B. plebejus was still experiencing demographic radiation from a modest number of founders. The B. barbus cyt b haplotypes suggested their original source was the River Danube. Through analysing the nuclear paralog sequences, evidence was provided of consistent genetic admixture between B. plebejus and B. barbus, being recorded in over 40% of the sampled fishes, indicating that their ecological and biological interactions are disrupting the genetic integrity of B. plebejus. Bayesian analysis and factorial correspondence analysis then revealed that the habitat fragmentation of the Adda River is not limiting population connectivity. It was apparent there has been recent and rapid upstream dispersion of B. barbus, with individuals overcoming barriers to their migration through using fish passes and/or through translocation between impounded sections by anglers. The potential conservation implications of this for the endemic Barbus species are discussed.
Starting Page	571
Ending Page	583
Page Count	13
File Format	PDF HTM / HTML
ISSN	11250003 17485851
DOI	10.1080/11250003.2014.944225
Journal	The European Zoological Journal
Volume Number	81
Issue Number	4
Language	English
Publisher	Taylor & Francis
Publisher Date	2014-11-14
Access Restriction	Open
Subject Keyword	Barbus Genetic structure Cyt b Nuclear paralogs Fish passes
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology

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