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首页> 外文期刊>Marine ecology progress series >Ocean climate, euphausiids and auklet nesting: inter-annual trends and variation in phenology, diet and growth of a planktivorous seabird, Ptychoramphus aleuticus
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Ocean climate, euphausiids and auklet nesting: inter-annual trends and variation in phenology, diet and growth of a planktivorous seabird, Ptychoramphus aleuticus

机译：海洋气候，古猿和Auklet筑巢：浮游海鸟Ptychoramphus aleuticus的物候，饮食和生长的年际趋势和变化

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摘要

Variability in ocean climate results in fluctuations in the timing and abundance of zoo-plankton. In turn, fluctuations in zooplankton as prey may have consequences for reproductive decisions and performance of planktivorous seabirds. We examined interrelationships between mean seasonal oceanographic conditions and prey availability and the timing of breeding, nestling diet, growth and productivity (as number of chicks fledged per breeding pair) of Cassin's auklet Ptychoramphus aleuticus in the central California Current System. Substantial inter-annual variability in seasonal ocean climate parameters as well as in auklet reproductive and diet characteristics was evident. Hatching dates and the proportion of all euphausiids in the diet were positively correlated with seasonal sea-surface temperature and negatively correlated with seasonal upwelling values. A significant negative correlation was found between the proportion of Euphausia pacifica in the diet and hatch date, while significant positive correlations were found between Thysanoessa spinifera in the diet and productivity, and between productivity and growth. Based on the California Cooperative Fisheries Investigations euphausiid data set, significant positive correlations were found between E. pacifica abundance and auklet meal mass and productivity and between T. spinifera abundance and auklet productivity. As demonstrated by the auklet diet, euphausiids responded to changes in ocean climate on multiple temporal scales. In most years, auklets responded adaptively to variation in oceanographic conditions and prey availability by modifying timing of breeding. However, in years when ocean conditions deteriorated after the initiation of breeding, prey availability was severely reduced beyond the auklet's adaptive response, resulting in diminished nestling growth and productivity.
机译：海洋气候的变化会导致浮游动物的时间和丰度波动。反过来，作为浮游生物的浮游动物的波动可能会对繁殖决定和浮游海鸟的表现产生影响。我们研究了加利福尼亚中央海流系统中Cassin的Auklet Ptychoramphus aleuticus的平均季节性海洋条件和猎物可获得性与繁殖时间，雏鸟饮食，生长和生产力（每对繁殖的雏鸡数量）之间的相互关系。季节性海洋气候参数以及秋葵生殖和饮食特性的年际变化明显。饵料的孵化日期和所有虾粉的比例与季节性海表温度呈正相关，与季节性上升值呈负相关。饮食中太平洋紫杉的比例与孵化日期之间存在显着的负相关，而饮食中的Thysanoessa spinifera与生产力之间以及生产力与生长之间存在显着的正相关。根据加州合作渔业调查的上等数据集，发现太平洋大肠埃希氏菌丰度与Auklet粗粉质量和生产力之间以及T. spinifera丰富度与Auklet生产力之间存在显着的正相关。正如通过Auklet饮食所证明的那样，e虫在多个时间尺度上对海洋气候的变化做出了响应。在大多数年份中，Auklet通过修改繁殖时机来适应海洋条件和猎物可用性的变化。然而，在繁殖开始后海洋条件恶化的年代，猎物的可利用性大大降低，超出了Auklet的适应性反应，导致雏鸟的生长和生产力下降。

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