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The puzzling demographic history and genetic differentiation of the twaite shad (Alosa fallax) in the Ebro River

Content Provider	Springer Nature Link
Author	Sotelo, Graciela Andree, Karl B. López, Miguel A. Alexandri, Paulo Gisbert, Enric Faria, Rui
Copyright Year	2014
Abstract	The Ebro, the largest Iberian river draining into the Mediterranean, historically supported one of the most important twaite shad (Alosa fallax) populations in the region. However, during the twentieth century multiple anthropogenic changes caused a severe decline and the presumed extinction of this species from the river by the 1970s. Its unexpected reappearance in 2004 thus provoked sound interest and raised important questions on the origin of those individuals and their genetic variability, which we address in this study. Adult shads captured in the Ebro from 2005 to 2008, together with samples from three other Mediterranean populations (Rhone, Corsica and Adriatic), were analyzed for two mitochondrial genes and six microsatellite loci. Results confirm the Mediterranean origin of A. fallax caught in the Ebro and reveal that it carries some genetic variation typical of Allis shad (A. alosa), suggesting historical introgression between these two closely related species. In addition, the A. fallax population from the Ebro presents a unique genetic composition and unexpectedly high levels of genetic diversity, when compared with the other Mediterranean populations analyzed. These findings raise important doubts on the demographic history of this population and underline the need for further studies to disentangle natural population dynamics from the role of anthropogenic factors on abrupt population fluctuations such as those reported here. The puzzling demographic history of A. fallax from the Ebro not only brings some hope for the recovery of similarly endangered populations but also provides a unique opportunity to study the factors underlying species’ persistence capacity when facing changing environmental conditions.
Starting Page	1037
Ending Page	1052
Page Count	16
File Format	PDF
ISSN	15660621
Journal	Conservation Genetics
Volume Number	15
Issue Number	5
e-ISSN	15729737
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-04-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	European shads Mitochondrial DNA Microsatellites Effective population size Introgressive hybridization Conservation Biology/Ecology Plant Sciences Animal Anatomy / Morphology / Histology Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Ecology, Evolution, Behavior and Systematics

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%xoo )u 3rfkh 3lvflf — 919 — use of river habitat survey to determine the spawning habitat characteristics of twaite shad (alosa fallax fallax).

The puzzling demographic history and genetic differentiation of the twaite shad (Alosa fallax) in the Ebro River

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