Population dynamics of the barnacle goose Branta leucopsis in the Baltic area: density-dependent effects on reproduction

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Larsson, KjellUppsala University, Sweden (author)

Population dynamics of the barnacle goose Branta leucopsis in the Baltic area : density-dependent effects on reproduction

Article/chapterEnglish1994

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British Ecological Society,1994
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LIBRIS-ID:oai:DiVA.org:lnu-33028
https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-33028URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

1. The three largest breeding colonies of barnacle geese Branta leucopsis in the Baltic area were studied from their natural establishments in 1971, 1982 and 1987, respectively, to 1993. The number of breeding pairs increased from one pair in 1971 to 1550, 225 and 150 pairs in the largest, second largest, and third largest colonies, respectively, in 1993. 2. Data on clutch size and number of hatched and fledged young were collected from the beginning or the middle of the 1980s. In the largest colony most data on reproductive success were obtained from observations of individually marked geese. 3. Mean clutch size differed among years and colonies. However, there was no trend for decreasing mean clutch size with increasing density in any of the colonies. Hatching success did not decrease with increasing density in the largest colony. 4. The production of fledged young per breeding pair declined drastically in the largest colony as numbers of breeding pairs rose. This decline was mainly caused by an increasing proportion of the breeding pairs failing to produce any fledged young at all. 5. The relative contribution of the smaller colonies to the total production of fledged young in the Baltic area increased considerably over the study years. In 1993, colony 2 hosted only about 13% of the number of breeding pairs in colonies 1 and 2 combined, but it produced about 38% of the fledged young. 6. Our results point out the need to study populations of colonially nesting geese on a colony by colony basis in order to detect density-dependent effects on reproduction.

Subject headings and genre

NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
Natural Science
Naturvetenskap

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Forslund, PärUppsala University, Sweden (author)
Uppsala University, Sweden (creator_code:org_t)

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In:Journal of Animal Ecology: British Ecological Society63:4, s. 954-9620021-87901365-2656

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Ecology

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By the university: Linnaeus University

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