Subglacial discharges create fluctuating foraging hotspots for sea birds in tidewater glacier bays

Jacek Urbański , Lech Stempniewicz , Jan Marcin Węsławski , Katarzyna Dragańska-Deja , Agnieszka Wochna , Michał Goc , Lech Iliszko

Abstract

Although the processes occurring at the front of an ice face in tidewater glacier bays still await thorough investigation, their importance to the rapidly changing polar environment is spurring a considerable research effort. Glacier melting, sediment delivery and the formation of seabird foraging hotspots are governed by subglacial discharges of meltwater. We have combined the results of tracking black-legged kittiwakes Rissa tridactyla equipped with GPS loggers, analyses of satellite images and in situ measurements of water temperature, salinity and turbidity in order to examine the magnitude and variability of such hotspots in the context of glacier bay hydrology. Small though these hotspots are in size, foraging in them appears to be highly intensive. They come into existence only if the subglacial discharge reaches the surface, if the entrainment velocity at a conduit is high and if there is sufficient macroplankton in the entrainment layer. The position and type of subglacial discharges may fluctuate in time and space, thereby influencing glacier bay hydrology and the occurrence of foraging hotspots.
Author Jacek Urbański GIS
Jacek Urbański,,
- GIS Center
, Lech Stempniewicz KEiZK
Lech Stempniewicz,,
- Department of Vertebrate Ecology and Zoology
, Jan Marcin Węsławski
Jan Marcin Węsławski,,
-
, Katarzyna Dragańska-Deja
Katarzyna Dragańska-Deja,,
-
, Agnieszka Wochna GIS
Agnieszka Wochna,,
- GIS Center
, Michał Goc KEiZK
Michał Goc,,
- Department of Vertebrate Ecology and Zoology
, Lech Iliszko KEiZK
Lech Iliszko,,
- Department of Vertebrate Ecology and Zoology
Other language title versions
Journal seriesScientific Reports, ISSN 2045-2322
Issue year2017
Vol7
Pages1-12
Publication size in sheets0.55
DOIDOI:10.1038/srep43999
URL http://www.nature.com/articles/srep43999.pdf
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa (CC-BY); with publication
Score (nominal)40
ScoreMinisterial score = 40.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 4.259 (2) - 2016=4.847 (5)
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