Biology 3445F Lecture Notes - Lecture 10: Propagule, Introduced Species, Community Structure
15 Nov 2016
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Bio3445 lec10 colonisation: establishment (2 step process): 1. Colonisation spatial process where a population becomes established in an area where it was previously absent. Closed systems: focus on single spatial scales and do not explicitly consider space (local scale dynamics) Open systems: interacting organisms and materials across multiple spatial scales (eg. local and regional scales) Community structure is caused by processes operating at multiple spatial scales. Explicitly consider spatial structure in describing community dynamics. Open community: a community that experience immigration and emigration. @ local spatial scales: selection is the main process driving community structure. @ regional scales: population drift dominates community structure. @ global scales: speciation drives community structure. Dispersal is the process that links all spatial scales. Propagule: a colonizing organism, individual or vegetative structure capable of establishing a self-sustaining population. Metacommunity set of local communities linked by dispersal of multiple, potentially interacting species. Active dispersal involves movement of the entire organism through its own ability.
