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"Anthropogenic threats have been considered to threaten wintering Magellanic penguins along the coasts of northern Argentina, Uruguay, and southern Brazil; these include water pollution caused by oil development and marine transport as well as fishery-associated hazards, such as bycatch and depletion of prey species," says Takashi Yamamoto of the Institute of Statistical Mathematics in Tokyo. "Our results suggest that the northward spatial expansion likely increases the probability to suffer these risks, and particularly so in females."
Researchers knew that penguins stranded along the South American coast were three times as likely to be females. The question was: why?
Data - Evidence - Males - Females - Winter
While data were lacking, there wasn't any evidence to suggest that males and females split up for the winter. Now, Yamamoto and his colleagues find that in fact they do. The researchers recorded the migratory and diving behavior of 14 Magellanic penguins (eight males and six females) during the non-breeding period in 2017 using LAT 2500 geolocators (Lotek Wireless, Inc.).
The Magellanic penguins finished breeding in late February. Afterward, they began their migration through April, returning to the breeding grounds in September or October. During the wintering period, the tracking data show that females reached more...
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