Nonbreeding season survival of northern bobwhite in northeastern Colorado

IF 1.7 3区生物学 Q3 ECOLOGY

Wildlife Biology Pub Date : 2023-10-17 DOI:10.1002/wlb3.01126

Joseph M. Wolske, Adam C. Behney, Larkin A. Powell

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引用次数: 0

Abstract

Northern bobwhites have experienced population declines in Colorado and range wide. Estimating vital rates can provide clues to factors limiting population growth rate. Although recent estimates of breeding season survival in the northwest corner of the northern bobwhite range are available, there have been no recent studies on nonbreeding season survival. We used radio‐telemetry to estimate nonbreeding season (October–March) survival of northern bobwhites at two study sites in northeastern Colorado during winter 2019–2020 and 2020–2021. Based on our sample of 157 bobwhites, we found that survival was highly variable between years and was negatively affected by colder daily minimum temperatures and deeper snow depths. Seasonal (six‐month) survival during the first year was 0.219 (SE = 0.040) and during the second year was 0.006 (SE = 0.005). We found no evidence that sex, age or study site influenced survival, and very weak support for an effect of body mass. During our study, there were two extreme winter weather events, during which we found unusually high numbers of non‐predation mortality. Overall, northern bobwhite nonbreeding season survival in the northwest corner of their range appears to be generally similar to other regions, except during extreme winter weather events, which resulted in high mortality. We encourage managers to create or maintain vegetation characteristics that will provide shelter from winter weather while also providing abundant food in close proximity.

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科罗拉多州东北部北部山齿鹑非繁殖期的存活率

在科罗拉多州，北方长齿鹑的数量有所下降，而且分布范围很广。估算生命率可以为限制人口增长率的因素提供线索。尽管最近对北部山齿鹑山脉西北角繁殖季节存活率的估计是可用的，但最近没有关于非繁殖季节存活率的研究。在2019-2020年冬季和2020-2021年冬季，我们使用无线电遥测技术估算了科罗拉多州东北部两个研究地点的北方山齿鹑的非繁殖期(10月至3月)存活率。根据我们对157只山齿鹑的样本，我们发现它们的存活率在不同年份之间变化很大，并且受到较低的日最低气温和较深的雪深的负面影响。第一年的季节性(6个月)生存率为0.219 (SE = 0.040)，第二年为0.006 (SE = 0.005)。我们没有发现性别、年龄或研究地点影响生存率的证据，体重影响的证据也很弱。在我们的研究中，有两个极端的冬季天气事件，在此期间，我们发现非捕食性死亡率异常高。总的来说，北部山齿鹑在其活动范围的西北角的非繁殖季节的存活率似乎与其他地区大致相似，除了极端的冬季天气事件，导致高死亡率。我们鼓励管理者创造或维护植被特征，既能提供遮挡冬季天气的住所，又能在附近提供丰富的食物。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Wildlife Biology 生物-动物学

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： WILDLIFE BIOLOGY is a high-quality scientific forum directing concise and up-to-date information to scientists, administrators, wildlife managers and conservationists. The journal encourages and welcomes original papers, short communications and reviews written in English from throughout the world. The journal accepts theoretical, empirical, and practical articles of high standard from all areas of wildlife science with the primary task of creating the scientific basis for the enhancement of wildlife management practices. Our concept of ''wildlife'' mainly includes mammal and bird species, but studies on other species or phenomena relevant to wildlife management are also of great interest. We adopt a broad concept of wildlife management, including all structures and actions with the purpose of conservation, sustainable use, and/or control of wildlife and its habitats, in order to safeguard sustainable relationships between wildlife and other human interests.