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9 - Habitat loss and fragmentation

16 bio 3115 universit dottawa university of ottawa

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Unformatted text preview: on Biology 2009-2010 With habitat loss, area-sensitive species are lost first… …so extensive habitat loss lowers diversity and changes community composition. Species requiring large habitat area Species not requiring large habitat area II. Loss of areasensitive species % of original species remaining 100 80 60 40 20 0 100 80 60 40 20 0 % of original habitat remaining M9.17 BIO 3115 Université d’Ottawa / University of Ottawa 2012 The relationship between persistence and habitat loss is usually a saturating relationship, so that as habitat declines, further habitat loss has increasingly large effects on extinction rates. % of species originally found in a given area Impact of habitat loss on species extinction and species persistence 100 90 50 0 0 10 50 100 % of total area preserved M9.18 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M9.9 BIO 3115 Conservation Biology 2009-2010 Habitat fragmentation by roads For many species, roads represent “inhospitable” habitat and/or barriers to movement, so that road construction represents an important form of habitat fragmentation. M9.19 BIO 3115 Université d’Ottawa / University of Ottawa 2012 III.1. Movement barriers an...
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