Notes 3 - Biodiversity Jan 30 Biodiversity includes -All...

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Biodiversity Jan 30 Biodiversity includes -All forms of life (i.e. bacteria, fungi, plants, invertebrates, vertebrates) -All levels of organization of living things (i.e. genetic variation, species, populations, communities, ecosystems and landscapes, biomes -The interactions among the forms of life and their levels of organization- the ways the various parts interact with each other (i.e. competition, predation and symbiosis) Geographic distribution of species -Species numbers increase with proximity to equator and rainfall Biodiversity is not simply a question of numbers, uniqueness matters Endemism (an endemic species = species found nowhere else) Species-area relationships -Larger areas hold more species -Islands and small, isolated areas host fewer species Biotic factors that promote diversity: structural engineers Human activities directly threatening biodiversity 1. Habitat loss or degradation a. Replace biodiverse natural ecosystem with monoculture 2. Over-exploitation a. Species
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Notes 3 - Biodiversity Jan 30 Biodiversity includes -All...

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