Pubblicazione scientifica

Variable outcomes of hybridization between declining Alosa alosa and Alosa fallax

FILONE TECNOLOGICO	TEMA
economia circolare e sostenibilità

RIASSUNTO

Abstract

Hybridization dynamics between co‐occurring species in environments where human‐mediated changes take place are important to quantify for furthering our understanding of human impacts on species evolution and for informing management. The allis shad Alosa alosa (Linnaeus, 1758) and twaite shad Alosa fallax (Lacépède, 1803), two clupeids sister species, have been severely impacted by human activities across Europe. The shrinkage of A. alosa distribution range along with the decline of the remaining populations' abundance threatens its persistence. The main objective was to evaluate the extent of hybridization and introgression between those interacting species. We developed a set of 77 species‐specific SNP loci that allowed a better resolution than morphological traits as they enabled the detection of hybrids up to the third generation. Variable rates of contemporary hybridization and introgression patterns were detected in 12 studied sites across the French Atlantic coast. Mitochondrial markers revealed a cyto‐nuclear discordance almost invariably involving A. alosa individuals with an A. fallax mitochondrial DNA and provided evidence of historical asymmetric introgression. Overall, contemporary and historical introgression revealed by nuclear and mitochondrial markers strongly suggests that a transfer of genes occurs from A. fallax toward A. alosa genome since at least four generations. Moreover, the outcomes of introgression greatly depend on the catchments where local processes are thought to occur. Undoubtedly, interspecific interaction and gene flow should not be overlooked when considering the management of those species.

DATA

Data di pubblicazione: 13/11/2019

AUTORI

TAILLEBOIS LAURA
SABATINO STEPHEN
MANICKI AURELIE
DAVERAT FRANCOISE
NACHON DAVID JOSE
LEPAIS OLIVIER

ENTE DI AFFERENZA

ECOBIOP INRA UNIVERSITE DE PAU ET PAYS DE L’ADOUR SAINT‐PEE‐SUR‐NIVELLE FRANCE
CIBIO‐INBIO UNIVERSIDADE DO PORTO VAIRAO PORTUGAL
EABX IRSTEA CESTAS CEDEX FRANCE
ESTACION DE HIDROBIOLOXIA ‘ENCORO DO CON’ UNIVERSIDADE DE SANTIAGO DE COMPOSTELA VILAGARCIA DE AROUSA SPAIN
BIOGECO INRA UNIV BORDEAUX CESTAS FRANCE

RIVISTA

Evolutionary Applications, 13(4), 636-651

IMPACT FACTOR

4,910

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