气候变化领域集成服务门户(CCPortal): Hierarchical foraging strategies of migratory short-tailed shearwaters during the non-breeding stage

CCPortal

DOI	10.1007/s00227-023-04370-6
	Hierarchical foraging strategies of migratory short-tailed shearwaters during the non-breeding stage
	Bool, Natalie; Sumner, Michael D.; Lea, Mary-Anne; Mcmahon, Clive R.; Hindell, Mark A.
发表日期	2024
ISSN	0025-3162
EISSN	1432-1793
起始页码	171
结束页码	5
卷号	171 期号:5
英文摘要	Foraging specialisations are common in animal populations, because they increase the rate at which individuals acquire food from a known and reliable source. Foraging plasticity, however, may also be important in variable or changing environments. To better understand how seabirds might respond to changing environmental conditions, we assessed how plastic the foraging behaviours of short-tailed shearwaters (Ardenna tenuirostris) were during their non-breeding season. To do this, we tracked 60 birds using global location sensing loggers (GLS) over a single year between 2012 and 2016 with the exception of 8 individuals that were tracked over 2 consecutive years. Birds predominantly foraged in either the Sea of Okhotsk/North Pacific Ocean (Western strategy) or the southeast Bering Sea/North Pacific (Eastern strategy). The eight birds tracked for 2 consecutive years all returned to the same core areas, indicating that these birds were faithful to foraging areas between years, although the time spent there varied, probably in response to local changes in food availability. Overall, 50% of the birds we tracked left their core area towards the end of the non-breeding period, moving into the Chukchi Sea, suggesting that the birds have flexible intra-seasonal foraging strategies whereby they follow prey aggregations. We hypothesise that seasonal declines in chlorophyll a concentrations in their primary core foraging areas coincide with changes in the availability of large-bodied krill, an important food source for short-tailed shearwaters. Decreasing prey abundance likely prompts the movement of birds out of their core foraging areas in search of food elsewhere. This strategy, through which individuals initially return to familiar areas but disperse if food is limited, provides a mechanism that allows the birds to respond to the effects of climate variability.
英文关键词	Seabirds; Climate change; Foraging; Plasticity; Bering Sea; Migratory
语种	英语
WOS研究方向	Marine & Freshwater Biology
WOS类目	Marine & Freshwater Biology
WOS记录号	WOS:001195471900002
来源期刊	MARINE BIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290061
作者单位	University of Tasmania; Australian Antarctic Division; Sydney Institute of Marine Science
推荐引用方式 GB/T 7714	Bool, Natalie,Sumner, Michael D.,Lea, Mary-Anne,et al. Hierarchical foraging strategies of migratory short-tailed shearwaters during the non-breeding stage[J],2024,171(5).
APA	Bool, Natalie,Sumner, Michael D.,Lea, Mary-Anne,Mcmahon, Clive R.,&Hindell, Mark A..(2024).Hierarchical foraging strategies of migratory short-tailed shearwaters during the non-breeding stage.MARINE BIOLOGY,171(5).
MLA	Bool, Natalie,et al."Hierarchical foraging strategies of migratory short-tailed shearwaters during the non-breeding stage".MARINE BIOLOGY 171.5(2024).