Title
Mates but not sexes differ in migratory niche in a monogamous penguin species Mates but not sexes differ in migratory niche in a monogamous penguin species
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
London ,
Subject
Chemistry
Biology
Human medicine
Source (journal)
Biology letters / Royal Society [London] - London
Volume/pages
11(2015) :9 , 4 p.
ISSN
1744-9561
1744-9561
Article Reference
20150429
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Strong pair bonds generally increase fitness in monogamous organisms, but may also underlie the risk of hampering it when re-pairing fails after the winter season. We investigated whether partners would either maintain contact or offset this risk by exploiting sex-specific favourable niches during winter in a migratory monogamous seabird, the southern rockhopper penguin Eudyptes chrysocome. Using light-based geolocation, we show that although the spatial distribution of both sexes largely overlapped, pair-wise mates were located on average 595 ± 260 km (and up to 2500 km) apart during winter. Stable isotope data also indicated a marked overlap between sex-specific isotopic niches (δ13C and δ15N values) but a segregation of the feeding habitats (δ13C values) within pairs. Importantly, the tracked females remained longer (12 days) at sea than males, but all re-mated with their previous partners after winter. Our study provides multiple evidence that migratory species may well demonstrate pair-wise segregation even in the absence of sex-specific winter niches (spatial and isotopic). We suggest that dispersive migration patterns with sex-biased timings may be a sufficient proximal cause for generating such a situation in migratory animals.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/2f57b6/10836.pdf
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