FN Archimer Export Format
PT J
TI Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach
BT 
AF FAURE, Johanna
   PERON, Clara
   GASCO, Nicolas
   MASSIOT-GRANIER, Felix
   SPITZ, Jerome
   GUINET, Christophe
   TIXIER, Paul
AS 1:1;2:1;3:1;4:1;5:2,3;6:2;7:2,4,5;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 UA, Lab Biol Organismes & Ecosyst Aquat BOREA, MNHN, CNRS,IRD,SU,UCN, F-75005 Paris, France.
   La Rochelle Univ, CNRS, UMR 7372, Ctr Etud Biol Chize CEBC, F-79360 Villiers En Bois, France.
   La Rochelle Univ, CNRS, Observ Pelagis, UMS 3462, F-17000 La Rochelle, France.
   Univ Montpellier, CNRS IFREMER IRD, MARBEC, Ave Jean Monnet CS 30171, F-34203 Sete, France.
   Deakin Univ, Fac Sci & Technol, Sch Life & Environm Sci, 221 Burwood Highway, Burwood, Vic 3125, Australia.
C2 MNHN, FRANCE
   UNIV LA ROCHELLE, FRANCE
   UNIV LA ROCHELLE, FRANCE
   IRD, FRANCE
   UNIV DEAKIN, AUSTRALIA
UM MARBEC
IN WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
IF 2.915
TC 5
UR https://archimer.ifremer.fr/doc/00710/82252/87044.pdf
   https://archimer.ifremer.fr/doc/00710/82252/87045.pdf
LA English
DT Article
DE ;Marine mammals;Depredation;Bioenergetic model;Fisheries interaction;Ecosystem-based management;Top predator conservation;Dissostichus eleginoides;Orcinus orca
AB Fisheries modify prey availability for marine predators by extracting resources but also by providing them with new feeding opportunities. Among these, depredation, which occurs when predators feed on fish caught on fishing gear, is a behavior developed by many species as a way to acquire food through limited foraging effort. However, the extent to which depredated resources from fisheries contribute to the energetic requirements and affect the demography of depredating individuals is unknown. We investigated the contribution of Patagonian toothfish Dissostichus eleginoides depredated on longlines to the energetic requirements of killer whales Orcinus orca around the Crozet Islands (southern Indian Ocean) over the period 2007-2018. Our results indicate that during days when depredation occurred, depredating individuals fulfilled on average 94.1% of their daily energetic requirements with depredated toothfish. However, the contribution varied from 1.2 to 13.3% of the monthly energetic requirements and from 2.4 to 8.8% of the yearly energetic requirements of the total population. Together, these findings suggest that intake of depredated toothfish can be substantial at a fine scale (daily and individually), potentially leading to temporary provisioning effects and changes in predation pressures. These effects become minor (< 10%), however, when considering the full population over a whole year. The contribution of depredated fish to the annual energetic requirements of the population has increased in recent years, likely due to larger fishing quotas and greater opportunities for whales to depredate, which stresses the importance of accounting for depredation in ecosystem-based management of fishing activity.
PY 2021
PD JUL
SO Marine Ecology Progress Series
SN 0171-8630
PU Inter-research
VL 668
UT 000670332700011
BP 149
EP 161
DI 10.3354/meps13725
ID 82252
ER

EF