EEB215H1 Lecture Notes - Lecture 5: Alpha Diversity, Species Richness, Chemosynthesis
22 Sep 2016
School
Department
Course
Professor
Document Summary
How much of it do we have. Known amount and amount that is estimated can be very different: ex. How to estimate what we don"t know: ex. Count how many invertebrates are in a tree and extrapolate for that or estimate. Thousands of new species are described each year: through diversity surveys, or molecular biology/clarification of taxonomy. Understand what a species or a hybrid is (textbook) We know less about underrepresented species: inconspicuous species. But estimated to be in the millions: those that live in remote habitats. Tube worms that don"t need light that use a chemosynthetic process. Species richness: number of species: alpha diversity: # in a certain place. A mountain peak: gamma: # in a broader geographical region. A mountain change: beta: how many species in the whole area divided by how many per mountain. Differences associated with habitat or spatial scale. Richness (counting the number of species) vs. evenness (biodiversity more evenly distributed)
