Post-moult movements of sympatrically breeding Humboldt and Magellanic Penguins in south-central Chile
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2016-07
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Facultad/escuela
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en
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Elsevier
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Atribution 4.0 International (CC BY 4.0)
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https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
Ten Humboldt (Spheniscus humboldti) and eight Magellanic Penguins (S. magellanicus) were
successfully equipped with satellite transmitters in March 2009 on Islotes Puñihuil in
central south-Chile to follow their post-moult dispersal. Overall, Humboldt Penguins could
be followed for a mean period of 49 ±18 days (range: 25–93) and Magellanic Penguins for
57 ±12 days (range 35–68). Irrespective of species and sex, seven study birds remained
in the vicinity of their breeding ground throughout the transmission period. All other
penguins moved northwards, either only a relatively short distance (max 400 km) to Isla
Mocha at 38°S (n = 3) or further north beyond 35°S (n = 8). However, eight of these birds
(73%) turned south again towards the end of the individual tracking periods. The total area
used by both species during the tracking period was restricted to a coastal area stretching
from the breeding site at 42°S about 1000 km to the north at about 32°S. The area used by
Humboldt penguins overlapped by 95% the area used by Magellanic penguins, whereas the
area used by the latter species was much larger and overlapped only by 45% with the area
used by Humboldt penguins. Overall, our results indicate that Magellanic Penguins in the
Pacific Ocean are probably less migratory than their conspecifics on the Atlantic side, while
Humboldt Penguins appear to be more migratory than previously anticipated. In general,
there was a poor relationship between preferred foraging areas and chlorophyll-a, as a
proxy for primary productivity, indicating the limitations of using remote-sensed primary
productivity as a proxy to interpret the foraging behaviour of marine predators. In addition,
there was also no clear relationship between the preferred foraging areas and the amount
of regional fish catches by artisanal fishery.
© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC
BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Notas
Indexación: Scopus.
Palabras clave
Seabirds, Pacific Ocean, Migration, Threatened Species, Competition, Conservation
Citación
Global Ecology and Conservation. Volume 7, Pages 49 - 58. 1 July 2016
DOI
10.1016/j.gecco.2016.05.001