lecture 20

lecture 20 - Landscapes (Chap 21) 1 1 Landscape Ecology -...

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Unformatted text preview: Landscapes (Chap 21) 1 1 Landscape Ecology - Landscape Ecology - Chapter 21 Chapter 21 Landscape Structure Landscape Structure Landscape Processes Landscape Processes Habitat Patches and Corridors Habitat Patches and Corridors Landscape Position Landscape Position Origins of Landscape Structure and Origins of Landscape Structure and Change Change Climate Climate Organisms Organisms 2 Definitions Definitions Landscape Ecology: Study of landscape Landscape Ecology: Study of landscape Landscape: Heterogeneous area Landscape: Heterogeneous area Landscape Elements: Landscape Elements: 3 Landscape Structure Landscape Structure Bowen Bowen and and Burgess Burgess published quantitative published quantitative analysis of several Ohio landscapes. analysis of several Ohio landscapes. Quantified patch shape by ratio of patch Quantified patch shape by ratio of patch perimeter to perimeter of a circle with an area perimeter to perimeter of a circle with an area equal to that of the patch. equal to that of the patch. DON DON T WORRY ABOUT DETAILS T WORRY ABOUT DETAILS S = P/[2( S = P/[2( A) A) 0.5 0.5 ] S = Patch shape S = Patch shape Increasing value indicates less circular shape Increasing value indicates less circular shape P = Patch perimeter P = Patch perimeter A = Patch area A = Patch area 4 Landscape Structure Landscape Structure Landscapes (Chap 21) 2 5 6 Fractal Geometry of Landscapes Fractal Geometry of Landscapes Perimeter estimates of a complex shape Perimeter estimates of a complex shape depend on size of measuring device. depend on size of measuring device. Why Study Landscape Structure? Why Study Landscape Structure? Landscape structure influences Landscape structure influences processes processes 7 Landscape Structure and Dispersal of Landscape Structure and Dispersal of Small Mammals Small Mammals Ecologists have proposed landscape Ecologists have proposed landscape structure can influence movement of structure can influence movement of organisms organisms Metapopulations: Groups of subpopulations Metapopulations: Groups of subpopulations in spatially isolated patches in spatially isolated patches Rate of movement of individuals between Rate of movement of individuals between subpopulations can affect subpopulations can affect 8 Landscape Structure and Landscape Structure and Dispersal of Small Mammals Dispersal of Small Mammals Diffendorfer Diffendorfer studied studied how patch how patch size affects size affects movement movement of small of small mammals. mammals. Landscapes (Chap 21) 3 9 Landscape Structure and Landscape Structure and Dispersal of Small Mammals Dispersal of Small Mammals Diffendorfer et al....
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lecture 20 - Landscapes (Chap 21) 1 1 Landscape Ecology -...

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