Filters: Tags: elevation (X) > Categories: Publication (X) > partyWithName: Landscape Conservation Cooperative Network (X)
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Understanding local and geographic factors influencing species distributions is a prerequisite for conservation planning. Our objective in this study was to model local and geographic variability in elevations occupied by native and nonnative trout in the northwestern Great Basin, USA. To this end, we analyzed a large existing data set of trout presence (5,156 observations) to evaluate two fundamental factors influencing occupied elevations: climate-related gradients in geography and local constraints imposed by topography. We applied quantile regression to model upstream and downstream distribution elevation limits for each trout species commonly found in the region (two native and two nonnative species). With...
Conserving a network of representative physical environments is a strategy that could conserve species both now and into the future, while allowing them to move in response to the climate. The key to implementing such a strategy is to define the physical environments in a way that is maximally relevant to species. We created comprehensive maps of geology, elevation zones, and landforms for the Eastern U.S. and then examined the relationships between these factors and 3434 rare species at 85,613 locations. Based on an index of importance derived from the number of species samples and an index of the percent above expected that a species was found on a feature, most species showed strong preferences for specific settings:...
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