BIOL10001 Lecture 27: BIOL10001 Lecture 27 Notes
20 Sep 2018
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Document Summary
Biological diversity: the variety of life on earth, variety of species, genes and systems. Diversity within a species classi ed by the variety of genes within a species. Causes of variance within populations mutations genetic drift interbreeding adaptation. Causes of variation among populations environmental drivers natural selection genetic drift migration of individuals. 226,000 marine species described up to 741,000 species yet to be discovered di erent functionalities and services. Variety across ecological systems, in terms of species composition, geographic. Community/ecosystem diversity context, physical structures, functions and connectivity. Scale of biodiversity species richness of a place. Gamma di erence in species richness among habitats species diversity in a landscape. Creates opportunities for di erent genotypes, species and communities. Primary hypotheses processes centre via dispersal on ocean currents oceanic conditions and past geological events. Centre of diversity is centre of speciation and dispersal of species out or vicariant. Centre of accumulation is speciation in isolated archipelagos and transport to.
