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Marine megafauna in environmental ex...

Gearheart, Geoffrey.

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Marine megafauna in environmental extremes: distribution and oceanic dispersal of polar and tropical tetrapods.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Marine megafauna in environmental extremes: distribution and oceanic dispersal of polar and tropical tetrapods./
Author:	Gearheart, Geoffrey.
Description:	159 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-07(E), Section: B.
Contained By:	Dissertation Abstracts International75-07B(E).
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3615210
ISBN:	9781303810510

Marine megafauna in environmental extremes: distribution and oceanic dispersal of polar and tropical tetrapods.
Gearheart, Geoffrey.

Marine megafauna in environmental extremes: distribution and oceanic dispersal of polar and tropical tetrapods. - 159 p.

Source: Dissertation Abstracts International, Volume: 75-07(E), Section: B.

Thesis (Ph.D.)--University of California, San Diego, 2014.

Early autumn visual surveys carried out in the Ross Sea in February-March 2013 reveal Emperor penguins congregate and feed in migratory "hubs" located in stable pack ice of the eastern Ross Sea, close to the Antarctic Slope Front. From there, based on their annual cycle, they travel to the marginal ice zone, or the eastern and western Ross Sea colonies. We hypothesize that Adelie penguins migrate with the expanding pack ice from breeding colonies in the western Ross Sea to lower latitudes with sufficient light to forage. This movement appears synchronous, as evidenced by the gradual increase in the relative abundance of this species along our survey transect, and the large concentration of birds in the eastern Ross Sea, beyond the shelf break. The Antarctic Slope Front is a hotspot for Weddell and crabeater seals, the former remaining in pack ice on the continental shelf, the latter being more numerous beyond the shelf break, possibly due to higher concentrations of krill.

ISBN: 9781303810510Subjects--Topical Terms:

1017726
Biology, Ecology.

Marine megafauna in environmental extremes: distribution and oceanic dispersal of polar and tropical tetrapods.
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008 150210s2014 ||||||||||||||||| ||eng d
020 $a 9781303810510
035 $a (MiAaPQ)AAI3615210
035 $a AAI3615210
040 $a MiAaPQ $c MiAaPQ
100 1 $a Gearheart, Geoffrey. $3 2100290
245 1 0 $a Marine megafauna in environmental extremes: distribution and oceanic dispersal of polar and tropical tetrapods.
300 $a 159 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-07(E), Section: B.
500 $a Adviser: Gerald L. Kooyman.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2014.
520 $a Early autumn visual surveys carried out in the Ross Sea in February-March 2013 reveal Emperor penguins congregate and feed in migratory "hubs" located in stable pack ice of the eastern Ross Sea, close to the Antarctic Slope Front. From there, based on their annual cycle, they travel to the marginal ice zone, or the eastern and western Ross Sea colonies. We hypothesize that Adelie penguins migrate with the expanding pack ice from breeding colonies in the western Ross Sea to lower latitudes with sufficient light to forage. This movement appears synchronous, as evidenced by the gradual increase in the relative abundance of this species along our survey transect, and the large concentration of birds in the eastern Ross Sea, beyond the shelf break. The Antarctic Slope Front is a hotspot for Weddell and crabeater seals, the former remaining in pack ice on the continental shelf, the latter being more numerous beyond the shelf break, possibly due to higher concentrations of krill.
520 $a Acoustic tracking and Lagrangian drifters enabled us to build a model for the first month of dispersal of leatherback hatchlings from Papua, Indonesia. This "critical period" corresponds to the duration of the yolk reserves, the limit beyond which turtles need to be in productive waters to survive. We show that hatchlings' movements strongly influence their trajectories, especially in flows not opposed to their swim direction. Offshore the Bird's Head Peninsula, the seasonally reversing New Guinea Coastal Current (NGCC) entrains hatchlings born in summer into the oligotrophic North Equatorial Counter Current (NECC). This process starts within the first hours of dispersal. In October-December, when predominant winds shift, causing the reversal of the NGCC, hatchlings deviate from prevailing currents, reaching after 30 days waters similarly unproductive as the NECC's. Winter dispersal is mediated by the southeastward NGCC. River outflow and upwelling are responsible for the productive areas traversed by hatchlings; the turbid waters potentially shielding turtles from predators. We suggest that local oceanography prevailing when turtles disperse mediates survival, with winter hatchlings having the best chances of overcoming the critical dispersal period.
590 $a School code: 0033.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Oceanography. $3 783691
650 4 $a Physical Oceanography. $3 1019163
690 $a 0329
690 $a 0416
690 $a 0415
710 2 $a University of California, San Diego. $b Oceanography. $3 1019111
773 0 $t Dissertation Abstracts International $g 75-07B(E).
790 $a 0033
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3615210