12 Flashcards
Species area curve?
X axis: area of land in log
Y axis: species richness in log
What really determines population growth between different areas?
Abiotic conditions.
What is everything that could increase species richness with increasing area?
•Increasing the number of different habitats
•the more space a species can use to reduce extinction.
•extinction rate due to stochasticity in a larger population is less likely
Which types of islands have higher immigration rates: far/near?
Near
Assumptions of Island biogeography theory (IBT) and how these assumptions play into ecological processes? 6•
Assumptions:
•all organisms are equally likely to colonize an island
•all organisms are equally likely to establish
•all organisms are equally likely to go extinct
Based on assumptions then:
•Population abundance: same
•Abiotic requirements: same
•Biotic interactions: same
Why do larger areas have a higher immigration rate?
Larger areas are more detectable by colonists in a probabilistic view.
What affects extinction rates?
The conditions of the area, not the size.