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Landskapsekologi

Landskapsekologi. Carl Troll, 1939. Strukturer matris fläckar korridorer. Processer bränder stormar klimat predation konkurrens översvämningar etc …. Funktioner bestäms av särskilda strukturer - > kanteffekter isolering. Störningar -> Högre artrikedom. Fragmentering ->

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Landskapsekologi

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  1. Landskapsekologi Carl Troll, 1939 • Strukturer • matris • fläckar • korridorer • Processer • bränder • stormar • klimat • predation • konkurrens • översvämningar • etc….. • Funktioner • bestäms av särskilda strukturer - > • kanteffekter • isolering Störningar -> Högre artrikedom Fragmentering -> Lägre artrikedom ?

  2. Öbiogeografi (Mac Arthur & Wilson 1967) S= CAz eller oftast: logS = z logA + logC S= artantal, C= konstant, skärning med y-axeln, A= area, z= regressionslinjens lutning

  3. Förklaringar • Area per se • Habitat diversity hypothesis • Passive sampling hypothesis • Extreme value function model: P •[1– exp(–exp(ylogA+logd))] • Self-similarity model: Si = cAiz med z = −log2a

  4. Simberloff & Wilson, 1970)

  5. Eftersom lämpliga habitat är ojämnt fördelade kommer även populationerna att finnas inom olika områden Metapopulationsekologi subpopulation subpopulation subpopulation subpopulation subpopulation Metapopulation

  6. Exemplet ängsnätfjärilen

  7. Mnemiopsisleidyi Invandrade arter

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