Flashcards in Exam I (supplement 3) Deck (8)
What are the most species rich environments?
-mediterranean type communities
What is an endemic species?
species that is found in a particular location and nowhere else
Variation in climate and environment
note: it is clear that local variation in climate, environment, topography and geological age are factors that affect patterns in species richness
-in terrestrial communities: species richness tends to increase due to decreasing elevation, increasing solar radiation, and increasing precipitation (hot, rainy, and lowland)
-these factors must act in combination for high rate of species
Variation in topography, geological age, and habitat size
-species richness can be greater where complex topography and great geographical age provide more environmental variation, which allows genetic isolation, local adaptation, and specification to occur
-larger areas also can provide a greater range of habitats in which species can evolve and live
fundamental niche + competition -> realized niche
-> niche portioning
Why are there so many species in the tropics?
-number of species increases closer to the equator
-receive more solar energy over the course of a year than temperate regions, and many of them have abundant rainfall
-species of tropical communities have had longer periods of stability than species of temperate communities, which have had to disperse in response to periods of glaciation
-warm temperatures and high humidity in many tropical areas provide favorable conditions for the growth and survival of many species
-greater niche specialization
How many species are on the planet? why is it important to know?
-1.5 million have been described, estimated to be between 5-10 million though.
-in order to know the level of biodiversity we have and to determine what we have before we lose it