Influence of age and individual identity in the use of breeding colony habitat by male Weddell seals in Erebus Bay, Antarctica

Influence of age and individual identity in the use of breeding colony habitat by male Weddell seals in Erebus Bay, Antarctica
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年龄和个体身份对南极洲埃里伯斯湾雄性威德尔海豹繁殖栖息地的影响

DOI:
10.1111/mms.12812
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发表时间:
2021
影响因子:
2.3
通讯作者:
Garrott, Robert A.
Garrott, Robert A.
中科院分区:
生物学3区
文献类型:
--
作者:
Brusa, Jamie L.;Rotella, Jay J.;Garrott, Robert A.

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Male–male contest behavior can contribute to spatial distributions of male pinnipeds during breeding seasons. To maximize breeding opportunities, the most competitive males would be expected to be surrounded by the highest numbers of reproductive‐age females. As information regarding fine‐scale spatial ecology of Weddell seals is lacking, we performed an exploratory study using kernel density analyses to evaluate age‐specific habitat use of male Weddell seals in Erebus Bay, Antarctica. Additionally, we investigated the relationship between age and number of surrounding reproductive‐age females using a competing set of regression models in a Bayesian framework that considered different functional forms of age while incorporating individual heterogeneity. As male adult Weddell seals aged, to at least 20 years, they were more likely to be found in areas associated with the greatest densities of reproductive‐age females, but individual heterogeneity also influenced the number of reproductive‐age female neighbors. The youngest males tended to haul out in offshore areas associated with better hunting, and older males tended to settle in more nearshore areas associated with more pup production. Our findings from this preliminary investigation indicate that male Weddell seal spatial behavior during the breeding season varies with age and individual and might be related to reproductive activity.
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