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首页> 外文期刊>Marine ecology progress series >Seabird nestling diets reflect latitudinal temperature-dependent variation in availability of key zooplankton prey populations
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Seabird nestling diets reflect latitudinal temperature-dependent variation in availability of key zooplankton prey populations

机译：海鸟雏鸟的饮食反映了主要浮游生物猎物种群中纬度随温度的变化

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摘要

We report on historical (1978 to 1982) and more recent (1996 to 2000) variation in the nestling diet of Cassin's auklet Ptychoramphus aleuticus breeding at Triangle Island (southern) and Frederick Island (northern), British Columbia, Canada; these islands are influenced by the California and the Alaska Current ecosystems, respectively. Ocean climate conditions off the British Columbia coast varied tremendously between 1978 and 2000. At both colonies, the nestling diet was composed largely of copepods and euphausiids, with fish contributing substantially in some of the warmer years at Triangle Island. The copepod Neocalanus cristatus was the single most important prey item at both colonies, and Stage V copepodites dominated in all sampling periods. We used a recently published temperature-dependent phenology equation to estimate the timing of peak biomass of Neocalanus near Triangle and Frederick Islands. During warm water years (such as 1996 and the El Nino of 1998), the timing and duration of N. cristatus availability in surface waters near Triangle Island was early and limited (mismatched) in contrast to cooler years (such as 1999 and 2000), when this prey was available to birds throughout the breeding season (matched). We argue that Cassin's auklet nestling diet data reflect the temperature-related timing of Neocalanus prey availability to seabirds in surface waters. Our results support the argument that inadequate overlap of prey availability and predator breeding (i.e. temporal trophic mismatch) is more likely on Triangle Island, where zooplankton peaks often occur earlier and are narrower, than on Frederick Island, where prey peaks are later and more protracted. Poor reproductive performance is the biological consequence of such trophic mismatch for Cassin's auklet. If the frequency of El Nino-like events increases and if ocean temperatures rise in the future, we predict an increase in the frequency of trophic mismatch events in the northeast Pacific Ocean.
机译：我们报道了加拿大不列颠哥伦比亚省的三角岛（南部）和弗雷德里克岛（北部）的卡辛红松鱼Ptychoramphus aleuticus繁殖的雏鸟饮食的历史（1978年至1982年）和最近（1996年至2000年）的变化；这些岛屿分别受到加利福尼亚和阿拉斯加当前生态系统的影响。在1978年至2000年之间，不列颠哥伦比亚省沿海的海洋气候条件发生了巨大变化。在两个殖民地，雏鸟的饮食主要由pe足类和虾形纲组成，在三角洲的某些较温暖的年份中，鱼类的贡献很大。 both足类新足纲是两个殖民地中最重要的猎物，在所有采样期间，V期co足类均占主导地位。我们使用了一个最近发布的温度相关的物候方程来估计三角形和弗雷德里克群岛附近新Neo的峰值生物量的时间。与温暖的年份（例如1999年和2000年）相比，在暖水年份（例如1996年和1998年的厄尔尼诺现象）中，三角岛附近地表水中的钩状猪笼草可获得性的时间和持续时间较早且有限（不匹配）。 ，整个繁殖季节鸟类都可以使用这种猎物（相配）。我们认为，卡辛的红雀雏鸟饮食数据反映了地表水域中新cal的猎物可利用时间与温度相关。我们的研究结果支持这样的论点，即与浮游动物峰值更早且更窄的三角岛相比，弗雷德里克岛上的猎物峰值较晚且更持久的三角洲岛上，猎物可用性和捕食者繁殖的重叠不充分（即时间营养失配）的可能性更大。 。生殖性能不佳是卡辛（Cassin）品系的这种营养失配的生物学结果。如果类似厄尔尼诺现象的事件的频率增加并且未来海洋温度上升，我们预计东北太平洋的营养失配事件的频率将会增加。

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  • 来源
    《Marine ecology progress series》 |2009年第393期|199-210|共12页
  • 作者

    Douglas F. Bertram; Anne Harfenist; April Hedd;

  • 作者单位

    Centre for Wildlife Ecology, Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada Canadian Wildlife Service, Environment Canada, Pacific Wildlife Research Centre, RR1 5421 Robertson Road, Delta, British Columbia V4K 3N2, Canada Environment Canada, Wildlife Science Division, c/o Institute of Ocean Sciences, 9860 West Saanich Road, PO Box 6000, Sidney, British Columbia V8L 4B2, Canada;

    Canadian Wildlife Service, Environment Canada, Pacific Wildlife Research Centre, RR1 5421 Robertson Road, Delta, British Columbia V4K 3N2, Canada Harfenist Environmental Consulting, Box 2498, Smithers, British Columbia VOJ 2N0, Canada;

    Centre for Wildlife Ecology, Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada Cognitive and Behavioural Ecology, Departments of Psychology and Biology, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X9, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    copepod availability; ocean temperature; match-mismatch; seabirds; cassin's auklet;

    机译：pe足类的可用性;海洋温度匹配不匹配;海鸟卡辛​​的Auklet;

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