Dolphin predation pressure on pelagic and demersal fish in the northwestern Mediterranean Sea

Type Article
Date 2018-09
Language English
Author(s) Queiros Quentin1, Fromentin Jean-MarcORCID1, Astruc Guillelme2, Bauer Robert Klaus1, Saraux Claire1
Affiliation(s) 1 : Univ Montpellier, CNRS, Ifremer, MARBEC,IRD, F-34200 Sete, France.
2 : Univ Paul Valery Montpellier 3, Univ Montpellier, CNRS, EPHE,IRD,CEFE, F-34293 Montpellier, France.
Source Marine Ecology Progress Series (0171-8630) (Inter-research), 2018-09 , Vol. 603 , P. 13-27
DOI 10.3354/meps12672
WOS© Times Cited 13
Keyword(s) Predation pressure, Top-down effect, Bottlenose dolphin, Striped dolphin, European hake, Sardine, Anchovy, Gulf of Lions

Sardine Sardina pilchardus, anchovy Engraulis encrasicolus and European hake Merluccius merluccius represent a significant part of the commercial landings in the Gulf of Lions (northwestern Mediterranean Sea). However, their stocks have shown severe declines during the last decades due to fishing pressure and/or environmental changes. The aim of this study was to estimate the current predation pressure of bottlenose dolphins Tursiops truncatus and striped dolphins Stenella coeruleoalba - which are abundant in the area-on sardine, anchovy and hake. To do so, we developed an original approach based on several data sets and models (aerial surveys, stomach contents, allometric and stock assessment models) and Monte Carlo simulations to incorporate various sources of uncertainty due to data limitations. Despite the uncertainties, the results showed that dolphin predation pressure on sardine and anchovy was extremely low in the Gulf of Lions (all simulations <0.5 % of the available stock), indicating little impact of dolphins on those populations. However, significant predation pressure on hake (median value: 23 %) was detected, a value which might have doubled in the last 30 yr because of hake overfishing. Overexploitation has thus reinforced the natural mortality of hake due to dolphin predation, but this predation pressure remains 2 to 3 times lower than that exerted by fisheries.

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Queiros Quentin, Fromentin Jean-Marc, Astruc Guillelme, Bauer Robert Klaus, Saraux Claire (2018). Dolphin predation pressure on pelagic and demersal fish in the northwestern Mediterranean Sea. Marine Ecology Progress Series, 603, 13-27. Publisher's official version : , Open Access version :