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首页> 外文期刊>Marine ecology progress series >Female southern right whales Eubalanena australis: Are there reproductive benefits associated with their coastal distribution off South Africa?
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Female southern right whales Eubalanena australis: Are there reproductive benefits associated with their coastal distribution off South Africa?

机译：雌性南部右鲸Eubalaena australis：在南非以外的沿海分布是否有生殖利益？

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Predictability in both meso- and microscale distribution of southern right whale Euba-laena australis females off the coast of South Africa is attributed to maternal philopatry, as well as favourable environmental conditions (calm water, generally shallow sloping, sedimentary sea bed) conducive to reduced energy consumption and a lowered risk of injury for both cows and calves. Spatial differences in reproductive success were compared between favoured (nursery) and non-favoured (non-nursery) areas and related to environmental differences in those areas. Reproductive success was inferred from analysis of calving intervals (3 yr = successful, 2 and 4 yr = unsuccessful; n = 808 calving events). Resighting rates as well as differences in distribution between experienced cows (3 or more calves) and inexperienced cows (1 or 2 calves) were also analysed. Less experienced cows were found to have significantly more unsuccessful calving intervals than experienced cows. No relationship was found between calving success and spatial distribution using calving interval analysis. Significant spatial differences in stranding rates of neonatal calves strongly suggest higher rates of calf mortality in areas dominated by non-cows, independent of environmental conditions. Social structure within wintering grounds was concluded to be more important than previously thought and potentially as important as environmental conditions for calf survival.
机译：南非沿海南部露脊鲸Euba-laena australis雌性在中微尺度上的可预测性均归因于母体的亲子鉴定以及有利的环境条件（平静的水，普遍的浅坡度，沉积海床）有利于减少降低了能量消耗，降低了母牛和犊牛受伤的风险。比较了偏爱地区和非偏爱地区在生殖成功方面的空间差异，并与这些地区的环境差异相关。通过产犊间隔的分析可以推断出繁殖成功（3年=成功，2和4年=不成功； n = 808次产犊事件）。还分析了有经验的母牛（3头或更多犊牛）和没有经验的母牛（1或2头犊牛）的检查率以及分布差异。与经验丰富的母牛相比，经验不足的母牛的产犊间隔明显不成功。使用产犊间隔分析未发现产犊成功与空间分布之间的关系。新生牛犊搁浅率的空间差异显着，这表明在以非母牛为主的地区，犊牛死亡率较高，与环境条件无关。结论是越冬场内的社会结构比以前认为的更为重要，并且可能与小牛生存的环境条件同样重要。

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