FN Archimer Export Format
PT J
TI High inter‐ and intraspecific niche overlap among three sympatrically breeding, closely‐related seabird species: Generalist foraging as an adaptation to a highly variable environment?
BT 
AF Dehnhard, Nina
   Achurch, Helen
   Clarke, Judy
   Michel, Loic
   Southwell, Colin
   Sumner, Michael D.
   Eens, Marcel
   Emmerson, Louise
AS 1:1,2,3;2:2;3:2;4:4;5:2;6:2;7:1;8:2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Department of Biology Behavioural Ecology and Ecophysiology Group University of Antwerp Campus Drie Eiken, Universiteitsplein 1 2610 Antwerp (Wilrijk),Belgium
   Australian Antarctic Division Department of the Environment and Energy Channel Highway Kingston 7050 Tasmania ,Australia
   Norwegian Institute for Nature Research – NINA Høgskoleringen 9 7035 Trondheim ,Norway
   Freshwater and Oceanic Sciences Unit of reSearch (FOCUS) Laboratory of Oceanology University of Liège 4000 Liège ,Belgium
C2 UNIV ANTWERP, BELGIUM
   AUSTRALIAN ANTARCTIC DIV, AUSTRALIA
   NINA, NORWAY
   UNIV LIEGE, BELGIUM
IF 5.091
TC 51
UR https://archimer.ifremer.fr/doc/00509/62056/66218.pdf
   https://archimer.ifremer.fr/doc/00509/62056/66219.pdf
   https://archimer.ifremer.fr/doc/00509/62056/66220.pdf
   https://archimer.ifremer.fr/doc/00509/62056/66221.pdf
   https://archimer.ifremer.fr/doc/00509/62056/66222.pdf
   https://archimer.ifremer.fr/doc/00509/62056/66223.pdf
   https://archimer.ifremer.fr/doc/00509/62056/66224.pdf
   https://archimer.ifremer.fr/doc/00509/62056/66225.pdf
   https://archimer.ifremer.fr/doc/00509/62056/66226.pdf
LA English
DT Article
DE ;Antarctica;biologging;expectation-maximization binary clustering;fulmarine petrel;generalized additive model;kernel distribution;model cross-validation;stable isotope analysis
AB 1.Ecological niche theory predicts sympatric species to show segregation in their spatio‐temporal habitat utilization or diet as a strategy to avoid competition. Similarly, within species individuals may specialise on specific dietary resources or foraging habitats. Such individual specialisation seems to occur particularly in environments with predictable resource distribution and limited environmental variability. Still little is known about how seasonal environmental variability affects segregation of resources within species and between closely related sympatric species. 2.The aim of the study was to investigate the foraging behaviour of three closely related and sympatrically breeding fulmarine petrels (Antarctic petrels Thalassoica antarctica, cape petrels Daption capense and southern fulmars Fulmarus glacialoides) in a seasonally highly variable environment (Prydz Bay, Antarctica) with the aim of assessing inter‐ and intraspecific overlap in utilized habitat, timing of foraging, and diet and to identify foraging habitat preferences. 3.We used GPS loggers with wet/dry sensors to assess spatial habitat utilization over the entire breeding season. Trophic overlap was investigated using stable isotope analysis based on blood, feathers and egg membranes. Foraging locations were identified using wet/dry data recorded by the GPS loggers and Expectation‐Maximization binary Clustering (EMbC). Foraging habitat preferences were modelled using GAMs and model cross‐validation. 4.During incubation and chick rearing, the utilization distribution of all three species overlapped significantly and species also overlapped in the timing of foraging during the day – partly during incubation and completely during chick‐rearing. Isotopic centroids showed no significant segregation between at least two species for feathers and egg membranes,, and among all species during incubation (reflected by blood). Within species, there was no individual specialization in foraging sites or environmental space. Furthermore, no single environmental covariate predicted foraging activity along trip trajectories. Instead, best‐explanatory environmental covariates varied within and between individuals even across short temporal scales, reflecting a highly generalist behaviour of birds. 5.Our results may be explained by optimal foraging theory. In the highly productive but spatio‐temporally variable Antarctic environment, being a generalist may be key to finding mobile prey – even though this increases the potential for competition within and among sympatric species. 
PY 2020
PD JAN
SO Journal Of Animal Ecology
SN 0021-8790
PU Wiley
VL 89
IS 1
UT 000485228000001
BP 104
EP 119
DI 10.1111/1365-2656.13078
ID 62056
ER

EF