Dall's sheep horn growth and harvest management in the Mackenzie Mountains, Northwest Territories, Canada

被引:0
|
作者
Karabatsos, Sofia [1 ,6 ]
Larter, Nicholas C. [2 ,7 ]
Allaire, Danny G. [2 ]
Eykelboom, Kayla [1 ]
Estevo, Cesar [1 ]
Iravani, Majid [3 ]
Barrio, Isabel C. [4 ]
Hik, David S. [5 ]
机构
[1] Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada
[2] Govt Northwest Terr Environm & Nat Resources, Ft Simpson, NT X0E 0N0, Canada
[3] Univ Alberta, Alberta Monitoring Inst, Edmonton, AB T6G 2E9, Canada
[4] Agr Univ Iceland, Fac Environm & Forest Sci, Arleyni 22, IS-112 Reykjavik, Iceland
[5] Simon Fraser Univ, Dept Biol Sci, 8888 Univ Dr, Burnaby, BC V5A 1S6, Canada
[6] 31 Emberlys Rd, Portugal Cove St Philips, NF A1M2Z2, Canada
[7] 9813-91A Ave, Grande Prairie, AB T8V0H1, Canada
来源
JOURNAL OF WILDLIFE MANAGEMENT | 2024年 / 88卷 / 03期
基金
加拿大自然科学与工程研究理事会;
关键词
hunting pressure; local management; O. dalli dalli; ram horns; thinhorn sheep; PHENOTYPIC PLASTICITY; SIZE; SELECTION; DECREASE; CLIMATE;
D O I
10.1002/jwmg.22536
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Across most of their native North American range, the horns of mountain sheep (Ovis spp.) males are getting smaller, a pattern attributed to selective hunting pressure. We measured the horns of 755 Dall's sheep males (Ovis dalli dalli) in the southern Mackenzie Mountains, Northwest Territories, between 2002 and 2017. For each male, we measured the circumference and length of each annulus for the right horn and calculated horn volume for each year. We examined changes in horn size in 4 different outfitter areas, using age at harvest as a covariate. Hunting pressure across years in the study area was consistently low, and this population did not experience the decline in horn size observed in several other mountain sheep populations in Canada. Over the 16-year period, the average horn volume of harvested males was stable and even increased in 1 outfitter area. Local management of Dall's sheep delivered independently by the guide outfitters in the Mackenzie Mountains appears to contribute to maintaining a population of males that has not been adversely affected by strong selective hunting pressure. The resilience of this management strategy may be challenged by environmental changes associated with rapid warming in northern mountain environments.
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页数:11
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