Effects of alga Fucus serratus decline on benthic assemblages and trophic linkages at its retreating southern range edge - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Marine Ecology Progress Series Année : 2015

Effects of alga Fucus serratus decline on benthic assemblages and trophic linkages at its retreating southern range edge

Linney Duarte
  • Fonction : Auteur
Cristina Docal
  • Fonction : Auteur
Rosa M. Viejo
  • Fonction : Auteur

Résumé

Canopy-forming seaweeds are important coastal ecosystem engineers that sustain diverse multi-trophic assemblages. Their losses, with the subsequent reduction in habitat complexity, have been documented across many parts of the world and are often attributed to climate change and other anthropogenic factors. The general aim of the present study was to understand the repercussions of the decline of the canopy-forming alga Fucus serratus L. at its retreating southern range edge in the diversity and food-web linkages of intertidal assemblages. Few studies have attempted to document changes in benthic food webs following canopy loss. We examined the differences among southern locations situated at different distances from the range margin: those at the very edge, where F. serratus experienced a dramatic decline during recent years (marginal locations), and those where F. serratus is still dominant (central locations). Comparisons were made among locations situated at the same latitude and sharing a recent history of F. serratus dominance. Trophic relationships were analyzed using natural abundances of carbon and nitrogen stable isotopes. We report clear changes in the structure of benthic assemblages and lower trophic positioning of some consumers, suggesting an overall shrinkage of the food web length at the contracting range edge of F. serratus, which will transfer to higher trophic levels. Under present and future climatic scenarios, shifts in the distribution of coastal ecosystem engineers could entail a reorganization of local natural assemblages and food webs. More attention should be given to measure how much these shifts can modify the whole coastal food webs and their functioning.

Dates et versions

hal-01919328 , version 1 (12-11-2018)

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Citer

Linney Duarte, Francesca Rossi, Cristina Docal, Rosa M. Viejo. Effects of alga Fucus serratus decline on benthic assemblages and trophic linkages at its retreating southern range edge. Marine Ecology Progress Series, 2015, 527, pp.87 - 103. ⟨10.3354/meps11248⟩. ⟨hal-01919328⟩
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