Toward a phenological mismatch in estuarine pelagic food web? - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue PLoS ONE Année : 2017

Toward a phenological mismatch in estuarine pelagic food web?

Résumé

Alterations of species phenology in response to climate change are now unquestionable. Until now, most studies have reported precocious occurrence of life cycle events as a major phenological response. Desynchronizations of biotic interactions, in particular predator-prey relationships, are however assumed to strongly impact ecosystems' functioning, as formalized by the Match-Mismatch Hypothesis (MMH). Temporal synchronicity between juvenile fish and zooplankton in estuaries is therefore of essential interest since estuaries are major nursery grounds for many commercial fish species. The Gironde estuary (SW France) has suffered significant alterations over the last three decades, including two Abrupt Ecosystem Shifts (AES), and three contrasted intershift periods. The main objective of this study was to depict modifications in fish and zooplankton phenology among inter-shift periods and discuss the potential effects of the resulting mismatches at a community scale. A flexible Bayesian method was used to estimate and compare yearly patterns of species abundance in the estuary among the three pre-defined periods. Results highlighted (1) an earlier peak of zooplankton production and entrance of fish species in the estuary and (2) a decrease in residence time of both groups in the estuary. Such species-specific phenological changes led to changes in temporal overlap between juvenile fish and their zooplanktonic prey. This situation questions the efficiency and potentially the viability of nursery function of the Gironde estuary, with potential implications for coastal marine fisheries of the Bay of Biscay.
Fichier principal
Vignette du fichier
bx2017-pub00054941.pdf (1.32 Mo) Télécharger le fichier
Origine : Accord explicite pour ce dépôt
Loading...

Dates et versions

hal-01541495 , version 1 (19-06-2017)

Identifiants

Citer

X. Chevillot, Hilaire Drouineau, Patrick Lambert, Laure Carassou, B. Sautour, et al.. Toward a phenological mismatch in estuarine pelagic food web?. PLoS ONE, 2017, 12 (3), pp.e0173752. ⟨10.1371/journal.pone.0173752⟩. ⟨hal-01541495⟩
174 Consultations
67 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More