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Climate-forced seasonal mismatch between the hatching of rhinoceros auklets and the availability of anchovy

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Title: Climate-forced seasonal mismatch between the hatching of rhinoceros auklets and the availability of anchovy
Authors: Watanuki, Yutaka Browse this author →KAKEN DB
Ito, Motohiro Browse this author
Deguchi, Tomohiro Browse this author
Minobe, Shoshiro Browse this author →KAKEN DB
Keywords: Climate change
Match-mismatch
Seabirds
Atmospheric pressure systems
Reproductive consequences
Issue Date: 30-Oct-2009
Publisher: Inter-Research
Journal Title: Marine Ecology Progress Series
Volume: 393
Start Page: 259
End Page: 271
Publisher DOI: 10.3354/meps08264
Abstract: 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.
Rights: © 2009 Inter-Research
Type: article
URI: http://hdl.handle.net/2115/40079
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 綿貫 豊

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