ABSTRACT: Habitat management to accommodate ecological needs of threatened species can help abate biodiversity decline. Some species require contrasting microhabitats for different functions, and may prefer patches with ample, diverse microhabitats. We examined this problem for the Critically Endangered great Indian bustard Ardeotis nigriceps in 175 km² breeding habitat in Kachchh, India. We developed behaviorally explicit resource selection functions (RSFs) by comparing used vs. available microhabitats using binomial generalized linear models that tested hypothesized habitat responses in an information theoretic framework. We identified suitable resource units based on fitted RSF values. We examined if availability of complementary resource units influenced density/usage at the patch level, using line transect distance sampling. Birds preferred agro-vegetation mixture, grassland, high fruit abundance and intermediate grazing density, and they avoided Prosopis thickets for foraging. They preferred moderately tall sward for day resting but shorter sward and less Prosopis for roosting. Nesting females preferred grasslands with relatively tall sward and abundant insects, while displaying males preferred grasslands with shorter sward, far from settlements. Thus, microhabitat selection differed between behaviors and differed from habitat availability. The RSF without behavioral segregation failed to capture these nuances and was non-informative for habitat management. Density/usage at the patch level was correlated with the availability of complementary microhabitats. Thus, protected area management to accommodate diverse life-history requirements may reduce species’ movements over large hostile landscapes and associated mortality. Overall, species requiring complementary microhabitats will benefit from management that promotes habitat heterogeneity. However, habitat use analysis based on behaviorally inexplicit occurrence cannot capture the habitat quality of such species.

中文翻译：

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细节是魔鬼：极度濒临灭绝的印度大bus的行为上明确的栖息地选择

摘要：为适应受威胁物种的生态需求而进行的生境管理有助于减轻生物多样性的下降。有些物种需要具有不同功能的微生境，并且可能更喜欢具有丰富多样的微生境的斑块。我们针对175 km ^2内极度濒临灭绝的大印度bus鸟Ardeotis nigriceps检验了这个问题印度Kachchh的繁殖栖息地。通过使用二项式广义线性模型比较二手和可利用的微生境，我们开发了行为显式的资源选择函数（RSF），该二项式广义线性模型在信息理论框架中测试了假设的生境响应。我们根据拟合的RSF值确定了合适的资源单位。我们使用线横断面距离采样检查了补充资源单元的可用性是否影响了补丁级别的密度/使用率。鸟类更喜欢农业-植被混合物，草地，高果丰度和中等放牧密度，并且它们避免了Prosopis灌木丛的觅食。他们倾向于在白天休息时使用适度较高的草皮，但草皮较短，而Prosopis较少栖息。筑巢的雌性偏爱草皮相对较高且昆虫丰富的草原，而雄性偏爱的草地偏爱草皮较短，远离定居点的草原。因此，微生境的选择在行为之间是不同的，并且与生境的可用性不同。没有行为隔离的RSF无法捕捉到这些细微差别，并且对栖息地管理没有指导意义。贴片水平的密度/使用率与补充微生境的可用性相关。因此，为适应不同的生活史要求而进行的保护区管理可能会减少物种在大型敌对景观上的活动以及相关的死亡率。总体而言，需要补充微生境的物种将受益于促进生境异质性的管理。然而，