Lect. 22 Landscape web

Lect 22 Landscape - “ edge ” species those not found in ecotones = “ interior ” species 4 Landscape Structure and Dispersal • Landscape

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1 Landscape Ecology = relationships b/n ecosystems Landscape : Heterogeneous area composed of several ecosystems. Landscape Elements : Visually distinctive, homogeneous patches (ecosystems) in a landscape. Forest, meadow, stream, etc. Scale can vary greatly, landscape for an ant different from that of a bird for e.g.
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2 Landscape Structure How large are the landscape elements (a.k.a. patch size)? What is the shape of the patches? How many patches are there? What is there relative position to one another? How does all that affect ecosystem processes, community structure, populations?
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3 Patches are not cleanly separated or distinct, usu. there are transitional zones between patches Ecotones = transitional habitat b/n 2 ecosystems. Physical and biological mix of ecosystems. Edge effects = conditions w/n ecotones. Often higher richness: species from each ecosystem + unique ecotone ( edge ) species Species within ecotone =
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Unformatted text preview: “ edge ” species; those not found in ecotones = “ interior ” species. 4 Landscape Structure and Dispersal • Landscape structure may influence migration. – Metapopulations : Subpopulations in isolated patches w/ significant exchange of individuals. • Rate of movement can affect species persistence in a landscape. Landscape ecologists try to understand such things… 5 Landscape Structure and the Dispersal of Mammals • Smaller patches = greater distances to travel, less movement b/n patches • Larger patches = smaller distances, more movement 6 Origins of Landscape Structure and Change • Geological processes – volcanoes, sedimentation, and erosion = sources of landscape structure. • Climate – Precipitation and temperature = erosion, nutrient flux • Organisms – Humans grow food, alter landscapes – Elephants, beavers, alligators, kangaroo rats...
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This note was uploaded on 01/13/2012 for the course BIO 8 taught by Professor Prestongalusky during the Fall '11 term at Riverside Community College.

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Lect 22 Landscape - “ edge ” species those not found in ecotones = “ interior ” species 4 Landscape Structure and Dispersal • Landscape

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