South Georgia pintails
نویسندگان
چکیده
منابع مشابه
Late Pleistocene colonization of South Georgia by yellowbilled pintails predates the Last Glacial Maximum
Aim Glacial cycles had a major influence on the distribution of high-latitude species, and while genetic consequences of these cycles have been well studied in the Circumpolar North, notably fewer studies have been undertaken in the Antarctic. Here, we use multilocus genetic data from the South Georgia pintail (Anas georgica georgica) as a proxy to study the presence and timing of ice-free refu...
متن کاملSpring-migration Ecology of Northern Pintails in South-central Nebraska
—Spring-migration ecology of staging Northern Pintails, Anas acuta, was investigated in south-central Nebraska, USA. Habitat associations, local movements, settling patterns, arrival dates, residency times and survival were estimated from 71 radiomarked pintails during spring 2001, 2003 and 2004, and diet determined from 130 females collected during spring 1998 and 1999. Seventy-two percent of ...
متن کاملThe Mobility of Breeding Pintails
ABSTP, ACT.--During 1971, 1972, and 1973 the mobility of breeding Pintails (Anas acura) was studied in the pothole region of central North Dakota. A total of 5 unpaired males, 8 paired males, and 15 females were marked and followed for periods long enough to enable home range estimation. The mean home range sizes for unpaired males, paired males, and paired females were 579 ha, 896 ha, and 480 ...
متن کاملGene Flow and Hybridization between Numerically Imbalanced Populations of Two Duck Species on the Subantarctic Island of South Georgia
Hybridization is common between species of animals, particularly in waterfowl (Anatidae). One factor shown to promote hybridization is restricted mate choice, which can occur when 2 species occur in sympatry but one is rare. According to the Hubbs principle, or "desperation hypothesis," the rarer species is more likely to mate with heterospecifics. We report the second of 2 independent examples...
متن کاملThe population of Carassius gibelio (Bloch, 1782) and its parasites in Madatapa Lake (South Georgia)
Gibel carp is a very successful invasive fish species in the waters of Georgian inland and the only fish species in Lake Madatapa. However, almost nothing is known about its biology and morpho-ecological peculiarities at the national level and even the distribution data is not documented. For the first time, we studied the population characteristics of gibel carp in Lake Madatapa (South Georgia...
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ژورنال
عنوان ژورنال: Oryx
سال: 1984
ISSN: 0030-6053,1365-3008
DOI: 10.1017/s0030605300018809