FN Archimer Export Format
PT J
TI High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability
BT 
AF Cox, Samantha
   Authier, Matthieu
   Orgeret, Florian
   Weimerskirch, Henri
   Guinet, Christophe
AS 1:1,2,3;2:4,5;3:1;4:1;5:1;
FF 1:;2:;3:;4:;5:;
C1 Centre d'Etudes Biologique de Chizé UMR 7372 ‐ CNRS , Universitié de La Rochelle Villiers‐en‐Bois ,France
   UMR MARBEC Station Ifremer Séte Séte, France
   Centre National d'Études Spatiales (CNES), Toulouse, France
   Observatoire PELAGIS UMS 3462 ‐ Universitié de La Rochelle ; CNRS La Rochelle ,France
   ADERA Pessac Cedex ,France
C2 CNRS, FRANCE
   IRD, FRANCE
   CNES, FRANCE
   UNIV LA ROCHELLE, FRANCE
   ADERA, FRANCE
UM MARBEC
IN WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-univ-france
IF 2.912
TC 10
UR https://archimer.ifremer.fr/doc/00598/71016/69289.pdf
   https://archimer.ifremer.fr/doc/00598/71016/69290.pdf
LA English
DT Article
DE ;bio-logging;early life;foraging ecology;juvenile mortality;Mirounga leonina;southern elephant seal;survival analyses
AB High juvenile mortality rates are typical of many long‐lived marine vertebrate predators. Insufficient development in dive and forage ability is considered a key driver of this. However, direct links to survival outcome are sparse, particularly in free‐ranging marine animals that may not return to land. In this study, we conduct exploratory investigations toward early mortality in juvenile southern elephant seals Mirounga leonina. Twenty postweaning pups were equipped with (a) a new‐generation satellite relay data tag, capable of remotely transmitting fine‐scale behavioral movements from accelerometers, and (b) a location transmitting only tag (so that mortality events could be distinguished from device failures). Individuals were followed during their first trip at sea (until mortality or return to land). Two analyses were conducted. First, the behavioral movements and encountered environmental conditions of nonsurviving pups were individually compared to temporally concurrent observations from grouped survivors. Second, common causes of mortality were investigated using Cox's proportional hazard regression and penalized shrinkage techniques. Nine individuals died (two females and seven males) and 11 survived (eight females and three males). All but one individual died before the return phase of their first trip at sea, and all but one were negatively buoyant. Causes of death were variable, although common factors included increased horizontal travel speeds and distances, decreased development in dive and forage ability, and habitat type visited (lower sea surface temperatures and decreased total [eddy] kinetic energy). For long‐lived marine vertebrate predators, such as the southern elephant seal, the first few months of life following independence represent a critical period, when small deviations in behavior from the norm appear sufficient to increase mortality risk. Survival rates may subsequently be particularly vulnerable to changes in climate and environment, which will have concomitant consequences on the demography and dynamics of populations. 
PY 2020
PD JAN
SO Ecology And Evolution
SN 2045-7758
PU Wiley
VL 10
IS 1
UT 000502011200001
BP 410
EP 430
DI 10.1002/ece3.5905
ID 71016
ER

EF