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The niche-breadth hypothesis predicts that species with the ability to use a broad range of spatial resources (microhabitats) should be less affected by fragmentation of native habitats than a more stenotypic species (Swihart et al., 2003).
Stenotypic niche requirements and endemism are suggested as primary contributors to the high proportion of imperiled darters (Etnier and Starnes, 1991).
In monitoring or habitat evaluation using spiders as bio-indicators, the absence of species typical for a habitat (stenotypic species) is often indicative of low habitat quality, including vegetation structure (Bonte & Maelfait 2001).
nuts, nectar) 3 Herbivore, generalist 2 Omnivore (plants or animals) 1 Species Status Endangered, endemic, of concern 5 Commercial recreational value 3 Other native species 1 Exotic 0 Habitat Specificity Alpha species (stenotypic, specialist) 5 Gamma species (landscape dependent) 3 Beta species (generalist, edge) 1 Seasonality (Birds only) Neotropical migrant 5 Short-distance migrant 4 Year round resident 3 Non-breeding season resident only 2 Migratory transient 1 Occasional 0 * Brooks and Croonquist (1990).