NDLI: Seabirds encountered along return transects between South Africa and Antarctica in summer in relation to hydrological features

Content Provider	Springer Nature Link
Author	Joiris, Claude R. Humphries, Grant R. W. Broyer, Alain
Copyright Year	2013
Abstract	The first aim of our long-term study on the at-sea distribution of the upper trophic levels—seabirds and marine mammals—in polar marine ecosystems is to identify the main factors affecting their distribution: water masses and pack ice, fronts and ice edge as defined on the basis of water temperature, salinity and ice overage. In this study, seabird at-sea distribution was determined in the south-eastern Atlantic Ocean in summer along four return transects between Cape Town, South Africa, and Queen Maud Land, Antarctica: two on board icebreaking MS Ivan Papanin and two on board icebreaking RV Polarstern between December 2007 and January 2012. During a total of 1,930 half-an-hour transect counts devoted to seabird recording, 69,000 individuals were encountered, belonging to 57 species (mean: 36 individuals per count, all species and expeditions pooled). In comparison, the adjacent Weddell Sea shows a lower seabird biodiversity (30 species and 150 individuals per count) than in the area covered by this study. European Arctic seas reflect an intermediate biodiversity, with 30 species and 60 individuals per count; the major difference is observed in closed pack ice, almost empty in the Arctic but showing a very high biomass in the Antarctic. On the other hand, following the same route in different years allowed to compare results: density and abundance were found to be homogenous and reproducible between years for some species, while very important patchiness was detected for others, causing large heterogeneities and differences between expeditions.
Starting Page	1633
Ending Page	1647
Page Count	15
File Format	PDF
ISSN	07224060
Journal	Polar Biology
Volume Number	36
Issue Number	11
e-ISSN	14322056
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-08-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Seabirds at-sea Antarctic Southern seas Water masses Fronts Pack ice Ice edge Ecology Oceanography Microbiology Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Agricultural and Biological Sciences

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