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首页> 外文期刊>Landscape Ecology >Assessing the influence of resource covariates at multiple spatial scales: an application to forest-dwelling caribou faced with intensive human activity.
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Assessing the influence of resource covariates at multiple spatial scales: an application to forest-dwelling caribou faced with intensive human activity.

机译：评估资源协变量在多个空间尺度上的影响：应用于人类密集活动的森林驯鹿驯鹿。

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Efforts in isolating the relative effects of resources and disturbances on animal-distribution patterns remain hindered by the difficulty of accounting for multiple scales of resource selection by animals with seasonally dynamic drivers. We developed multi-scale, seasonal models to explore how local resource selection by the threatened forest-dwelling woodland caribou (Rangifer tarandus caribou) was influenced by both broad-scale landscape context and local resource heterogeneity in the intensively managed region of Charlevoix, Quebec, Canada, located on the southern border of the North American caribou range. We estimated resource selection functions using 23 GPS-collared caribou monitored from 2004 to 2006 and landscape data on vegetation classes, terrain conditions, and roads. We found evidence of thresholds in road "proximity" effects (up to 1.25 km), which underscores the importance of including landscape context variables in addition to locally measured variables, and of fitting seasonal-specific models given temporal variation in the magnitude of selection and optimal scale of measurement. Open lichen woodlands were an important cover type for caribou during winter and spring, whereas deciduous forests, wetlands, and even young disturbed stands became important during calving and summer. Caribou consistently avoided roads and rugged terrain conditions at both local and landscape levels. Landscape context fundamentally constrains the choices available to animals, and we showed that failing to consider landscape context, or arbitrarily choosing an inappropriate scale for measuring covariates, may provide biased inferences with respect to habitat selection patterns. Effective habitat management for rare or declining species should carefully consider the hierarchical nature of habitat selection.
机译：隔离资源和干扰对动物分布方式的相对影响的努力仍然受到难以解释具有季节性动态驱动因素的动物对资源选择的多尺度影响的阻碍。我们开发了多尺度的季节性模型，以探索受威胁的森林栖息林地驯鹿（ Rangifer tarandus驯鹿）对本地资源的选择如何受到集约化景观环境和本地资源异质性的强烈影响。位于加拿大魁北克省查勒沃（Charlevoix）的管理区域，位于北美驯鹿山脉的南部边界。我们使用2004年至2006年监测的23头GPS领驯鹿以及有关植被类别，地形条件和道路的景观数据，估算了资源选择功能。我们发现了道路“接近”效应阈值（最长1.25 km）的证据，这强调了除了局部测量的变量之外，还包括景观环境变量的重要性，并且考虑到选择和变化幅度的时间变化，拟合季节性特定模型的重要性。最佳测量规模。在冬季和春季，开放的地衣林地是北美驯鹿的重要掩盖类型，而在产犊和夏季，落叶林，湿地甚至年轻的受干扰林地都变得很重要。驯鹿始终避免在本地和景观水平上的道路和崎terrain的地形条件。景观环境从根本上限制了动物的选择，并且我们发现，不考虑景观环境或任意选择不恰当的比例来衡量协变量，可能会提供关于生境选择模式的偏见。对稀有或正在下降的物种进行有效的栖息地管理，应仔细考虑栖息地选择的等级性质。

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