2.1: intro to Biodiversity

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Presentation transcript:

2.1: intro to Biodiversity

The variety of life on earth

Three scales of biodiversity 1. Genetic Diversity: Genetic variation among individuals in a population (what’s a population?)

Environmental stressors Physical Stress (natural disasters) Wildfires Pollution Thermal stress Radiation Climatic (light, temperature) Biological (predation, competition, parasitism, lack of mates)

Bottleneck Effect

2. Species Diversity: The number of species in a region or habitat (in a community or ecosystem)

A species can interbreed and produce viable offspring. # Identified and catalogued by scientists: 2 million # Estimates of actual total number on earth: 5-100 million Most common estimate: 10 million

Most common animal?

Most common organism: the bacterium Pelagibacter ubique (1/3rd of all single-celled ocean organisms)

CED Textbook 3. Habitat/Ecosystem diversity: the variety of habitats that exist within a given region

Generalist species can live under a wide range of biotic/abiotic conditions

Specialist species live under a very narrow range of conditions or feed on one or a very small group of species

hehe

Species Richness: # of Total Species

Species Evenness: Abundance of individuals within each species

(Apple!)