La captura comercial del coypo<i>Myocastor coypus</i>(Mammalia: Myocastoridae) en Laguna Adela, Argentina

Gorostiague, Martin; Regidor, Héctor A

doi:10.1080/01650529309360888

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…Only three studies have described aspects of population structure in their South American regions of origin (Crespo, 1981;Colantoni, 1993;Gorostiague & Regidor, 1993 all using data from hunting returns. No study to date has monitored seasonal changes in the composition of indigenous populations using recapture data.…”

Section: Introductionmentioning

confidence: 99%

“…Most of our understanding of the population dynamics of coypus has come from efforts to reduce the sizes of introduced populations (Poland: Ryszkowski, 1966; U.S.A.: Netherlands: Kik, 1980; U.K.: Gosling & Baker, 1987;France: Doncaster & Micol, 1989; Italy: Reggiani, Boitani & De Stefano, 1995;Germany: Meyer, 2001). Only three studies have described aspects of population structure in their South American regions of origin (Crespo, 1981;Colantoni, 1993;Gorostiague & Regidor, 1993), all using data from hunting returns. No study to date has monitored seasonal changes in the composition of indigenous populations using recapture data.…”

Section: Introductionmentioning

confidence: 99%

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Population structure of coypus (Myocastor coypus) in their region of origin and comparison with introduced populations

2003

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The first population recapture study of indigenous coypus Myocastor coypus is reported in protected areas of Argentine pampas within a region where the species is hunted for food and fur. Quarterly live trapping at two sites captured a high proportion of all coypus present (96% of juveniles; 85% of adults, independently of season, site and sex). Survival (from mortality or emigration) was constant across sites and seasons, and higher for juvenile males than females (88% and 71%, respectively) and lower for adult males than females (45% and 81%). Most turn-over in numbers was replaced by births, and immigrating males tended to be the largest individuals present. Sex ratios were male-biased amongst juveniles and female-biased amongst adults. Taken together, these results are consistent with local resource competition in habitat rendered low in quality by crowding inside the locally protected areas. The indigenous coypu population matured more slowly, and to a smaller maximum body size, than coypus studied in introduced populations in North America and particularly in northern Europe. Cold European winters may have contributed to the evolution of precocious sexual maturity and larger body sizes in European compared with indigenous populations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Population structure of coypus (Myocastor coypus) in their region of origin and comparison with introduced populations

2003

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The Relative Importance of Life‐History Variables to Population Growth Rate in Mammals: Cole’s Prediction Revisited

Oli¹,

Dobson²

2003

The American Naturalist

231

199

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The relative importance of life-history variables to population growth rate (lambda) has substantial consequences for the study of life-history evolution and for the dynamics of biological populations. Using life-history data for 142 natural populations of mammals, we estimated the elasticity of lambda to changes in age at maturity (alpha), age at last reproduction (omega), juvenile survival (Pj), adult survival (Pa), and fertility (F). Elasticities were then used to quantify the relative importance of alpha, omega, Pj, Pa, and F to lambda and to test theoretical predictions regarding the relative influence on lambda of changes in life-history variables. Neither alpha nor any other single life-history variable had the largest relative influence on lambda in the majority of the populations, and this pattern did not change substantially when effects of phylogeny and body size were statistically removed. Empirical support for theoretical predictions was poor at best. However, analyses of elasticities on the basis of the magnitude (F) and onset (alpha) of reproduction revealed that alpha, followed by F, had the largest relative influence on lambda in populations characterized by early maturity and high reproductive rates, or when F/alpha > 0.60. When maturity was delayed and reproductive rates were low, or when F/alpha < 0.15, survival rates were overwhelmingly most influential, and reproductive parameters (alpha and F) had little relative influence on lambda. Population dynamic consequences of likely responses of biological populations to perturbations in life-history variables are examined, and predictions are made regarding the numerical dynamics of age-structured populations on the basis of values of the F/alpha ratio.

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La captura comercial del coypoMyocastor coypus(Mammalia: Myocastoridae) en Laguna Adela, Argentina

Cited by 2 publications

References 3 publications

Population structure of coypus (Myocastor coypus) in their region of origin and comparison with introduced populations

Population structure of coypus (Myocastor coypus) in their region of origin and comparison with introduced populations

The Relative Importance of Life‐History Variables to Population Growth Rate in Mammals: Cole’s Prediction Revisited

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