NDLI: Cycles of Euphausia superba recruitment evident in the diet of Pygoscelid penguins and net trawls in the South Shetland Islands, Antarctica

Content Provider	Springer Nature Link
Author	Miller, Aileen K. Trivelpiece, Wayne Z.
Copyright Year	2007
Abstract	Size and sex of Antarctic krill taken from chinstrap and gentoo penguin diet were compared to those from scientific net surveys in the South Shetland Islands from 1998 to 2006 in order to evaluate penguin diet as a sampling mechanism and to look at trends in krill populations. Both penguin diet and net samples revealed a 4–5 year cycle in krill recruitment with one or two strong cohorts sustaining the population during each cycle. Penguin diet samples contained adult krill of similar lengths to those caught in nets; however, penguins rarely took juvenile krill. Penguin diet samples contained proportionately more females when the krill population was dominated by large adults at the end of the cycles; net samples showed greater proportions of males in these years. These patterns are comparable to those reported elsewhere in the region and are likely driven by the availability of different sizes and sexes of krill in relation to the colony.
Starting Page	1615
Ending Page	1623
Page Count	9
File Format	PDF
ISSN	07224060
Journal	Polar Biology
Volume Number	30
Issue Number	12
e-ISSN	14322056
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-07-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chinstrap penguin Gentoo penguin Euphausia superba Recruitment Sex-ratios Spatial distribution Zoology Plant Sciences Microbiology Oceanography Ecology
Content Type	Text
Resource Type	Article
Subject	Agricultural and Biological Sciences

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