| タイトル |
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en
Climate-forced seasonal mismatch between the hatching of rhinoceros auklets and the availability of anchovy
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| 作成者 |
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| アクセス権 |
open access |
| 権利情報 |
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| 主題 |
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Other
en
Climate change
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Other
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Match-mismatch
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Other
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Seabirds
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Other
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Atmospheric pressure systems
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Other
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Reproductive consequences
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NDC
468
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| 内容注記 |
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Abstract
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Predator-prey relationships are key to understanding complex marine ecosystem dynamics. The match-mismatch hypothesis posits that predators time energy-intensive activities, such as reproduction, to periods of high food availability. However, predators may be constrained by various ecological or physiological processes, leading to mistimed activities relative to prey availability. We investigated inter-annual variation in the timing of breeding for a piscivorous seabird (rhinoceros auklet Cerorhinca monocerata) in relation to availability of a preferred prey item, Japanese anchovy Engraulis japonicus, using data collected over 18 yr between 1984 and 2006 at Teuri Island in the northern Japan Sea. Our primary goals were (1) to identify the climatic factors that affect the seabirds' timing of breeding, proxied by hatching date, and anchovy seasonal availability, and (2) to quantify the fitness effects of predator-prey matches and mismatches relative to climate variability. Hatching date was later in years with lower spring air temperatures. Auklets switched their feeding from sandlance and juvenile greenling to anchovy when it was transported into the birds' foraging range with the seasonal northern expansion of 13 degrees C warm water from the south. The mismatch between hatching date and the period of high anchovy availability was most pronounced when spring air temperatures were warm, and there was a weak Tsushima (warm) Current. Spring air temperature was influenced by spring atmospheric pressure gradients in the Arctic and northern Eurasia, which drive the east Asian winter monsoon, whereas timing of the Tsushima warm water expansion was influenced by winter surface pressures over the western North Pacific. Chick growth rates, mass at fledging, and overall fledging success (fitness) were lower during mismatch years when the auklets fed less on anchovy. The auklets were constrained to adjust hatching date because the seasonal mismatch appeared to be driven by independent and unpredictable surface pressure patterns.
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| 出版者 |
en
Inter-Research
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| 日付 |
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| 言語 |
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| 資源タイプ |
journal article |
| 出版タイプ |
VoR |
| 資源識別子 |
HDL
http://hdl.handle.net/2115/40079
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| 関連 |
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isIdenticalTo
DOI
https://doi.org/10.3354/meps08264
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| 収録誌情報 |
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en
Marine Ecology Progress Series
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巻393
開始ページ259
終了ページ271
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| ファイル |
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| コンテンツ更新日時 |
2023-07-26 |
