BIOL 308 Lecture Notes - Lecture 16: Salp, Frequency Distribution
Document Summary
Regulation: balance between birth and death (by nature) The range of population that can exist in balance changed from a single point to a range. Leads to the frequency distribution graph: how likely of population size to be (bell distribution from the carrying capacity) The steeper the curve the stronger of regulation (density dependence), converge faster to. K, not much room for environmental variation, range of population size is smaller. Increase environmental fluctuation increases the population size fluctuation. Interaction between regulation and fluctuation (with interspecific interactions) Temperature and area of ice cover fluctuates between years. Salp growth increases when less ice, krill growth increases with more ice (refuge from predator for young krills, and more abundant food source for adults) Competition between 2 species mediated by fluctuations in environment, and mediated by predation. A group of potentially interacting species that occupy a given space. The fundamental unit concept: community is a strong ecological units (not always true)
