Productivity, Size, Age, and Sex Structure of Nuisance Beaver Colonies in Wisconsin

Peterson, Ronald P.; Payne, Neil F.

doi:10.2307/3801909

Cited by 11 publications

(9 citation statements)

References 5 publications

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“…Despite their small sample size, the difference in reproductive success may be real, since the population was expanding very rapidly at that time. The pregnancy rate in our study (72.5%) is a little higher than the ones reported in North America (Newfoundland 70%, Payne, 1984a; Wisconsin 58%, Peterson & Payne, 1986). In general, mean litter size in North America seems to increase towards higher latitudes: Mississippi 2.6 (Wigley et al, 1983), California 2.3 (Busher, 1987), Wisconsin 3.9 (Peterson & Payne, 1986), Newfoundland 2.9 (Payne, 1984a) and Alaska 3.1 (Boyce, 1981) per female.…”

Section: Discussioncontrasting

confidence: 63%

“…In the data collected from 1969 to 1971, the mean number of foetuses was 4.7 (Lahti & Helminen, 1974). In general, mean litter size in North America seems to increase towards higher latitudes: Mississippi 2.6 (Wigley et al, 1983), California 2.3 (Busher, 1987), Wisconsin 3.9 (Peterson & Payne, 1986), Newfoundland 2.9 (Payne, 1984a) and Alaska 3.1 (Boyce, 1981) per female. Mean litter size of Canadian beavers in Russian Carelia, originating from the Finnish population, is 3.3 (Danilov, 1995), paralleling our results.…”

Section: Discussionmentioning

confidence: 91%

“…Mean litter size of Canadian beavers in Russian Carelia, originating from the Finnish population, is 3.3 (Danilov, 1995), paralleling our results. In general, mean litter size in North America seems to increase towards higher latitudes: Mississippi 2.6 (Wigley et al, 1983), California 2.3 (Busher, 1987), Wisconsin 3.9 (Peterson & Payne, 1986), Newfoundland 2.9 (Payne, 1984a) and Alaska 3.1 (Boyce, 1981) per female. The pregnancy rate in our study (72.5%) is a little higher than the ones reported in North America (Newfoundland 70%, Payne, 1984a;Wisconsin 58%, Peterson & Payne, 1986).…”

Section: Discussionmentioning

confidence: 96%

“…In Finland, Canadian beavers copulate in January or February and give birth in May and early June (Lahti & Helminen, 1974), therefore far developed foetuses from collected specimens were easy to observe. The number of the previous year's foetuses was based on the placental scars that attachment of foetus causes (Wigley, Roberts & Arner, 1983;Peterson & Payne, 1986). Scars are c. 1 cm wide dark bands, 5±10 cm from each other and clearly visible in the following spring.…”

Section: Methodsmentioning

confidence: 99%

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Costs of reproduction in introduced female Canadian beavers (Castor canadensis)

Ruusila¹,

Ermala²,

Hyvärinen

2000

Journal of Zoology

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In iteroparous organisms, maximum lifetime reproductive success is achieved through multiple successful breeding attempts. Therefore one of an individual's major life-history decisions is the allocation of resources between current and future reproduction. We studied the production of foetuses in the introduced female Canadian beaver Castor canadensis in Finland in 1992±93. The number of foetuses produced in 1993 was negatively correlated with the number produced in the previous year, irrespective of female age. Females that bred only in 1993 tended to produce more foetuses in that year than females that had reproduced in both years. However, the total number of foetuses produced was higher in females that had young in both years, stressing the importance of multiple breeding attempts in maximizing lifetime reproductive success. Despite the small size of the founder population in Finland, mean litter size and pregnancy rates were not different from North American populations.

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Section: Discussioncontrasting

confidence: 63%

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Costs of reproduction in introduced female Canadian beavers (Castor canadensis)

Ruusila¹,

Ermala²,

Hyvärinen

2000

Journal of Zoology

View full text Add to dashboard Cite

show abstract

“…Comparable calculations from Henry's (1967) Ohio data indicated 60% and 42%, respectively, for these age-classes. Peterson (1979) reported annual mortality of nuisance beaver to be 46% overall, 73% for kits, and 29% for beaver 2 years and older. Rutherford (1964) believed postnatal and juvenile mortality rarely exceeded 10% of the total number born.…”

Section: Other Population Parametersmentioning

confidence: 95%