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Author |
Thiebot Jean-Baptiste, Bost Charles-André, Dehnhard Nina, Demongin Laurent, Eens Marcel, Lepoint Gilles, Cherel Yves, Poisbleau Maud, |
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Title |
Mates but not sexes differ in migratory niche in a monogamous penguin species
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Journal Article |
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2015 |
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Biology Letters |
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11 |
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9 |
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20150429-20150429 |
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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 ({delta}13C and{delta} 15N values) but a segregation of the feeding habitats ({delta}13C 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.
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1744-9561 |
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yes |
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6236 |
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