|
I conducted the first demographic analysis of collared pikas in the southwest Yukon. Individual growth rates were best described using a Gompertz model, and these rates were higher than those reported from southern latitudes. Parturition dates were asynchronous and weakly related to snow accumulation. Over-winter survival was low (34% adults; 25% juveniles), and juvenile survival was not related to dispersal, patch density, or parturition date. Survival was not sex-biased but varied depending on year of birth, aspect and other habitat variables, the latter showing considerable variation among years. A minimum of 34% of juveniles made inter-patch movements (mean of 332m); and both sexes dispersed with equal frequency....
|
I conducted the first demographic analysis of collared pikas in the southwest Yukon. Individual growth rates were best described using a Gompertz model, and these rates were higher than those reported from southern latitudes. Parturition dates were asynchronous and weakly related to snow accumulation. Over-winter survival was low (34% adults; 25% juveniles), and juvenile survival was not related to dispersal, patch density, or parturition date. Survival was not sex-biased but varied depending on year of birth, aspect and other habitat variables, the latter showing considerable variation among years. A minimum of 34% of juveniles made inter-patch movements (mean of 332m); and both sexes dispersed with equal frequency....
|
I conducted the first demographic analysis of collared pikas in the southwest Yukon. Individual growth rates were best described using a Gompertz model, and these rates were higher than those reported from southern latitudes. Parturition dates were asynchronous and weakly related to snow accumulation. Over-winter survival was low (34% adults; 25% juveniles), and juvenile survival was not related to dispersal, patch density, or parturition date. Survival was not sex-biased but varied depending on year of birth, aspect and other habitat variables, the latter showing considerable variation among years. A minimum of 34% of juveniles made inter-patch movements (mean of 332m); and both sexes dispersed with equal frequency....
|
I conducted the first demographic analysis of collared pikas in the southwest Yukon. Individual growth rates were best described using a Gompertz model, and these rates were higher than those reported from southern latitudes. Parturition dates were asynchronous and weakly related to snow accumulation. Over-winter survival was low (34% adults; 25% juveniles), and juvenile survival was not related to dispersal, patch density, or parturition date. Survival was not sex-biased but varied depending on year of birth, aspect and other habitat variables, the latter showing considerable variation among years. A minimum of 34% of juveniles made inter-patch movements (mean of 332m); and both sexes dispersed with equal frequency....
|
|