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首页> 外文期刊>Marine ecology progress series >Seasonal and interannual correlations between right-whale distribution and calving success and chlorophyll concentrations in the Gulf of Maine, USA
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Seasonal and interannual correlations between right-whale distribution and calving success and chlorophyll concentrations in the Gulf of Maine, USA

机译：美国缅因湾右鲸分布与产犊成功率和叶绿素浓度之间的季节和年际关系

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ABSTRACT: The North Atlantic right whale Eubalaena glacialis is one of the most endangered species of large whales. Although human-caused mortality is the primary factor contributing to poor recovery of E. glacialis, variability in reproductive success may also play a role. The present study evaluates the idea that seasonal distributions and reproductive success in E. glacialis are linked to food availability or related environmental conditions that can be assessed by treating satellite-derived sea-surface chlorophyll (chl) concentration as a proxy. Sea-surface chl time series in the major high-use feeding habitats and whale-sightings data were compared. Whale transition between habitats reflects a pattern in the seasonal distribution of peak concentration in satellite-derived chl. A regionally and seasonally weighted chl index was calculated to reflect aspects of average potential food condition. We found a significant correlation between the number of whale calves born and the weighted chl averaged over the prior 2 yr. These findings are consistent with the view that food availability during and just before the gestation period may be a critical factor regulating reproductive success, with low food years contributing to delays in conception. Longer time series are necessary to examine the predictive relationship between weighted chl concentration and calf production. Although ecological interactions and whale reproductive biology are certainly more complex than can be encompassed by emphasizing only food availability, analysis of satellite-derived surface chl concentrations provides a practical means to monitor a level of ecosystem variability that affects right-whale distributions and productivity.
机译：摘要：北大西洋右鲸 Eubalaena glacialis 是大鲸鱼中最濒危的物种之一。尽管人为造成的死亡率是导致E康复不佳的主要因素。 glacialis ，生殖成功的可变性也可能起作用。本研究评估了季节性分布和 E繁殖成功的想法。 glacialis 与食物供应量或相关的环境条件有关，可以通过将卫星来源的海表叶绿素（chl）浓度作为替代指标进行评估。比较了主要高采食生境中的海表chl时间序列和鲸鱼观测数据。生境之间的鲸鱼过渡反映了卫星来源的chl中峰值浓度的季节性分布模式。计算了按地区和季节性加权的chl指数，以反映平均潜在食物状况的各个方面。我们发现出生的鲸犊牛数量与前2年的平均chl加权平均值之间存在显着相关性。这些发现与以下观点是一致的：妊娠期和妊娠期之前的食物供应可能是调节生殖成功的关键因素，而低食物年数会导致受孕延迟。需要更长的时间序列以检查加权的chl浓度与犊牛生产之间的预测关系。尽管生态相互作用和鲸鱼生殖生物学肯定比仅强调食物的可获得性要复杂得多，但对卫星衍生的表面chl浓度的分析提供了一种实用的手段，可以监测影响右鲸分布和生产力的生态系统变异水平。

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