Population dynamics of Newfoundland beaver
The demography of beaver was studied in Newfoundland from 1956 to 1965. Population densities were low and seldom exceeded one colony per 2.6 km 2 (1 mi 2 ). About 80% of the adult females were fertile and the number of young per litter averaged 2.7. The annual mortality rate of beavers was about 30%...
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Canadian Science Publishing
1977
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Online Access: | http://dx.doi.org/10.1139/z77-192 http://www.nrcresearchpress.com/doi/pdf/10.1139/z77-192 |
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crcansciencepubl:10.1139/z77-192 2024-04-28T08:28:44+00:00 Population dynamics of Newfoundland beaver Bergerud, Arthur T. Miller, Donald R. 1977 http://dx.doi.org/10.1139/z77-192 http://www.nrcresearchpress.com/doi/pdf/10.1139/z77-192 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 55, issue 9, page 1480-1492 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1977 crcansciencepubl https://doi.org/10.1139/z77-192 2024-04-09T06:56:30Z The demography of beaver was studied in Newfoundland from 1956 to 1965. Population densities were low and seldom exceeded one colony per 2.6 km 2 (1 mi 2 ). About 80% of the adult females were fertile and the number of young per litter averaged 2.7. The annual mortality rate of beavers was about 30% in southeastern Newfoundland. A more detailed study was made of a population living in a 39-km 2 (15-mi 2 ) study area. This population had 20, 23, and 24 active colonies, 1958–1960. In 1961 it declined to 18 colonies. We removed the beavers in 1962. The replacement colonies, resulting initially from ingress, were 7 in 1962, 12 in 1963, 17 in 1964, and 15 in 1965. When the population was high in 1958–1960, the fertility of females was high (78%) but the litter size in 1960 appeared to be less than elsewhere. When the population declined in 1960–1961, productivity declined and some animals may have starved over winter. It was concluded that territorial behaviour spaces colonies, dispersing the population within the limits dictated by the availability of water and food resources. However, such a system did not prevent overutilization of food resources and decline of the population from reduced reproduction and increased mortality. Article in Journal/Newspaper Newfoundland Canadian Science Publishing Canadian Journal of Zoology 55 9 1480 1492 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
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Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Bergerud, Arthur T. Miller, Donald R. Population dynamics of Newfoundland beaver |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
The demography of beaver was studied in Newfoundland from 1956 to 1965. Population densities were low and seldom exceeded one colony per 2.6 km 2 (1 mi 2 ). About 80% of the adult females were fertile and the number of young per litter averaged 2.7. The annual mortality rate of beavers was about 30% in southeastern Newfoundland. A more detailed study was made of a population living in a 39-km 2 (15-mi 2 ) study area. This population had 20, 23, and 24 active colonies, 1958–1960. In 1961 it declined to 18 colonies. We removed the beavers in 1962. The replacement colonies, resulting initially from ingress, were 7 in 1962, 12 in 1963, 17 in 1964, and 15 in 1965. When the population was high in 1958–1960, the fertility of females was high (78%) but the litter size in 1960 appeared to be less than elsewhere. When the population declined in 1960–1961, productivity declined and some animals may have starved over winter. It was concluded that territorial behaviour spaces colonies, dispersing the population within the limits dictated by the availability of water and food resources. However, such a system did not prevent overutilization of food resources and decline of the population from reduced reproduction and increased mortality. |
format |
Article in Journal/Newspaper |
author |
Bergerud, Arthur T. Miller, Donald R. |
author_facet |
Bergerud, Arthur T. Miller, Donald R. |
author_sort |
Bergerud, Arthur T. |
title |
Population dynamics of Newfoundland beaver |
title_short |
Population dynamics of Newfoundland beaver |
title_full |
Population dynamics of Newfoundland beaver |
title_fullStr |
Population dynamics of Newfoundland beaver |
title_full_unstemmed |
Population dynamics of Newfoundland beaver |
title_sort |
population dynamics of newfoundland beaver |
publisher |
Canadian Science Publishing |
publishDate |
1977 |
url |
http://dx.doi.org/10.1139/z77-192 http://www.nrcresearchpress.com/doi/pdf/10.1139/z77-192 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Zoology volume 55, issue 9, page 1480-1492 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z77-192 |
container_title |
Canadian Journal of Zoology |
container_volume |
55 |
container_issue |
9 |
container_start_page |
1480 |
op_container_end_page |
1492 |
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1797587167538577408 |