气候变化领域集成服务门户(CCPortal): Omnivorous summer feeding by juvenile Antarctic krill in coastal waters

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DOI	10.1002/lno.12533
	Omnivorous summer feeding by juvenile Antarctic krill in coastal waters
	Conroy, John A.; Steinberg, Deborah K.; Nardelli, Schuyler C.; Schofield, Oscar
发表日期	2024
ISSN	0024-3590
EISSN	1939-5590
起始页码	69
结束页码	4
卷号	69 期号:4
英文摘要	The Antarctic krill Euphausia superba is often considered an herbivore but is notable for its trophic flexibility, which includes feeding on protistan and metazoan zooplankton. Characterizing krill trophic position (TP) is important for understanding carbon and energy flow from phytoplankton to vertebrate predators and to the deep ocean, especially as plankton composition is sensitive to changing climate. We used repeated field sampling and experiments to study feeding by juvenile krill during three austral summers in waters near Palmer Station, Antarctica. Our approach was to combine seasonal carbon budgets, gut fluorescence measurements, imaging flow cytometry, and compound-specific isotope analysis of amino acids. Field measurements coupled to experimentally derived grazing functional response curves suggest that phytoplankton grazing alone was insufficient to support the growth and basal metabolism of juvenile krill. Phytoplankton consumption by juvenile krill was limited due to inefficient feeding on nanoplankton (2-20 mu m), which constituted the majority of autotrophic prey. Mean krill TP and the metazoan dietary fraction increased in years with higher mesozooplankton biomass, which was not coupled to phytoplankton biomass. Comparing TP estimates using delta 15N of different amino acids indicated a substantial and consistent food-web contribution from heterotrophic protists. Phytoplankton, metazoans, and heterotrophic protists all were important contributors to a diverse krill diet that changed substantially among years. Juvenile krill fed mostly on heterotrophic prey during summer near Palmer Station, and this food web complexity should be considered more broadly throughout the changing Southern Ocean.
语种	英语
WOS研究方向	Marine & Freshwater Biology ; Oceanography
WOS类目	Limnology ; Oceanography
WOS记录号	WOS:001170022500001
来源期刊	LIMNOLOGY AND OCEANOGRAPHY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/298684
作者单位	William & Mary; Virginia Institute of Marine Science; Rutgers University System; Rutgers University New Brunswick; University of California System; University of California Santa Cruz; United States Department of the Interior; United States Geological Survey
推荐引用方式 GB/T 7714	Conroy, John A.,Steinberg, Deborah K.,Nardelli, Schuyler C.,et al. Omnivorous summer feeding by juvenile Antarctic krill in coastal waters[J],2024,69(4).
APA	Conroy, John A.,Steinberg, Deborah K.,Nardelli, Schuyler C.,&Schofield, Oscar.(2024).Omnivorous summer feeding by juvenile Antarctic krill in coastal waters.LIMNOLOGY AND OCEANOGRAPHY,69(4).
MLA	Conroy, John A.,et al."Omnivorous summer feeding by juvenile Antarctic krill in coastal waters".LIMNOLOGY AND OCEANOGRAPHY 69.4(2024).