Patrones de uso de sitios naturales y artificiales por Branta bernicla nigricans (Anseriformes: Anatidae) en Guerrero Negro, Baja California Sur, México

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Revista de Biología Tropical, ISSN: 0034-7744, Vol: 61, Issue: 2

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Martínez Cedillo, Israel, Carmona, Roberto, Ward, David H., Danemann, Gustavo D.
Universidad de Costa Rica
guerrero negro lagoon, brant, feeding, age groups, winter, tides, laguna guerrero negro, ganso de collar, alimentación, invernada, mareas
article description
Habitat use patterns of the Black Brant Branta bernicla nigricans\n(Anseriformes: Anatidae) in natural and artificial areas of Guerrero\nNegro, Baja California Sur, Mexico. The Black Brant is a common\n\ninhabitant of the Western Artic American tundra, which migrates to\nSouthern Pacific coasts during the winter season. Approximately,\n31 000 birds (31%) constitute the Mexican population of Brants at\nGuerrero Negro, Ojo de Liebre, and Exportadora de Sal lagoon complex;\nnevertheless, there is little information about the distribution\npatterns and zone usage. At Guerrero Negro Lagoon (GNL), Ojo de Liebre\nLagoon (OLL, both natural sites), and at Exportadora de Sal (ESSA,\nartificial site) we determined by monthly censuses (from November\n2006 to April 2007, 08:00-16:00h) and observed: (1) season and site\neffects on population structure (age groups), and (2) the tide level\nrelationship with the abundance and proportion of feeding birds.\nWithin a total of 150 observation hours and 98 birds, our results\nshowed a general 0.68 proportion of adults, that was higher in winter\nthan in spring. The statistics analysis showed no effects by site\non the proportion of feeding birds, but we observed a temporal decrease\nat ESSA and at GNL. In contrast the proportion of feeding birds at\nOLL was constant. We observed an increase in the juveniles between\nwinter and spring. This increase is related with the differential\nmigration, which mentions that the juveniles are the last to leave\nthe wintering area. In winter the relations of the tide level with\nthe abundance of Brant were: direct at ESSA, inverse at OLL and no\nrelation found at GNL. In spring, no relation was observed in the\nsites. The proportion of Brants feeding at OLL (the site with the\nhigher abundance) was independent of the tide level. This is related\nwith two possible behaviors of the geese: (1) they can move through\nthe lagoon and take advantage of the tidal lag, which is up to four\nhours; and (2) they can modify their feeding strategies, more on\nfloating eelgrass (Zostera marina).

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