Geographic range size is often conceptualized as a fixed attribute of a species and treated as such for the purposes of quantification of extinction risk; species occupying smaller geographic ranges are assumed to have a higher risk of extinction, all else being equal. However many species are mobile, and their movements range from relatively predictable to-and-fro migrations to complex irregular movements shown by nomadic species. These movements can lead to substantial temporary expansion and contraction of geographic ranges, potentially to levels which may pose an extinction risk.
Original Source [2]
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Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/geographic-range-size-and-extinction-risk-assessment-nomadic-species
[2] http://onlinelibrary.wiley.com/doi/10.1111/cobi.12440/abstract
[3] http://admin.indiaenvironmentportal.org.in/category/author/claire-runge
[4] http://admin.indiaenvironmentportal.org.in/category/author/ayesha-tulloch
[5] http://admin.indiaenvironmentportal.org.in/category/author/edd-hammill-et-al
[6] http://admin.indiaenvironmentportal.org.in/category/journal/conservation-biology
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/birds
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/endangered-species
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/australia
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/extinct-species
