LODEX : sémantisation & visualisation

Site exemple

Title

Contrasting effects of climate change in continental vs. oceanic environments on population persistence and microevolution of Atlantic salmon

Publication Year

2013

Author(s)
  • Piou, Cyril
  • Prevost, Etienne
Source
GLOBAL CHANGE BIOLOGY Volume: 19 Issue: 3 Pages: 711-723 Published: 2013
ISSN
1354-1013 eISSN: 1365-2486
Abstract

Facing climate change (CC), species are prone to multiple modifications in their environment that can lead to extinction, migration or adaptation. Identifying the role and interplay of different potential stressors becomes a key question. Anadromous fishes will be exposed to both river and oceanic habitat changes. For Atlantic salmon, the river water temperature, river flow and oceanic growth conditions appear as three main stressing factors. They could act on population dynamics or as selective forces on life-history pathways. Using an individual-based demo-genetic model, we assessed the effects of these factors (1) to compare risks of extinction resulting from CC in river and ocean, and (2) to assess CC effects on life-history pathways including the evolution of underlying genetic control of phenotypic plasticity. We focused on Atlantic salmon populations from Southern Europe for a time horizon of three decades. We showed that CC in river alone should not lead to extinction of Southern European salmon populations. In contrast, the reduced oceanic growth appeared as a significant threat for population persistence. An increase in river flow amplitude increased the risk of local extinction in synergy with the oceanic effects, but river temperature rise reduced this risk. In terms of life-history modifications, the reduced oceanic growth increased the age of return of individuals through plastic and genetic responses. The river temperature rise increased the proportion of sexually mature parr, but the genetic evolution of the maturation threshold lowered the maturation rate of male parr. This was identified as a case of environmentally driven plastic response that masked an underlying evolutionary response of plasticity going in the opposite direction. We concluded that to counteract oceanic effects, river flow management represented the sole potential force to reduce the extinction probability of Atlantic salmon populations in Southern Europe, although this might not impede changes in migration life history.

Author Keyword(s)
  • diadromous fish
  • ecogenetic modelling
  • evolutionary demography
  • extinction risk
  • life-history strategies
  • phenotypic plasticity
  • population dynamics
  • river flow management
  • Salmo salar
KeyWord(s) Plus
  • LIFE-HISTORY VARIATION
  • ALTERNATIVE REPRODUCTIVE TACTICS
  • DENSITY-DEPENDENT GROWTH
  • PHENOTYPIC PLASTICITY
  • CHINOOK SALMON
  • SALAR L.
  • WATER TEMPERATURE
  • GENETIC-VARIATION
  • REACTION NORMS
  • SMOLT SIZE
ESI Discipline(s)
  • Environment/Ecology
Web of Science Category(ies)
  • Biodiversity Conservation
  • Ecology
  • Environmental Sciences
Adress(es)

[Piou, Cyril; Prevost, Etienne] INRA, UMR ECOBIOP 1224, F-64310 Quartier Ibarron, St Pee Sur Nive, France; [Piou, Cyril; Prevost, Etienne] Univ Pau & Pays Adour, UFR Sci & Tech Cote Basque, F-64600 Anglet, France; [Piou, Cyril] CIRAD, UPR Bioagresseurs Anal & Maitrise Risque, F-34398 Montpellier, France

Reprint Adress

Piou, C (reprint author), CIRAD BIOS, TA A106-D,Campus Int Baillarguet, F-534398 Montpellier, France.

Country(ies)
  • France
CNRS - Adress(es)
    Accession Number
    WOS:000314219700004
    uid:/J2TDH637
    Powered by Lodex 8.18.5