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- W2470913887 abstract "The percentage of willow ptarmigan (Lagopus lagopus) harvested in Newfoundland varied in 10 years, 1955 to 1964, from 5 to 40 percent. The annual changes in exploitation were not correlated with bird densities, hunting pressures, hunting success, hatching chronology, or days of precipitation during the hunting season. The percentage of harvest was correlated with the number of young raised per hen (r = -0.753). Also, two indices to the vulnerability of the population each year to hunting were correlated with the ratio of young per hen. It is suggested that the vulnerability of ptarmigan varies among years and has a basis in the annual changes in the intrinsic viability of the annual cohorts. Abstract: The percentage of willow ptarmigan (Lagopus lagopus) harvested in Newfoundland varied in 10 years, 1955 to 1964, from 5 to 40 percent. The annual changes in exploitation were not correlated with bird densities, hunting pressures, hunting success, hatching chronology, or days of precipitation during the hunting season. The percentage of harvest was correlated with the number of young raised per hen (r = -0.753). Also, two indices to the vulnerability of the population each year to hunting were correlated with the ratio of young per hen. It is suggested that the vulnerability of ptarmigan varies among years and has a basis in the annual changes in the intrinsic viability of the annual cohorts." @default.
- W2470913887 created "2016-07-22" @default.
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- W2470913887 date "1972-01-01" @default.
- W2470913887 modified "2023-09-23" @default.
- W2470913887 title "CHANGES IN THE VULNERABILITY OF PTARMIGAN TO" @default.
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- W2470913887 hasPublicationYear "1972" @default.
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