Lecture%209%20answers

Lecture%209%20answers - Answers to study questions Lecture...

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Answers to study questions Lecture 9, Population regulation and competition 1. A system with strong negative feedback is likely to respond to an experimental perturbation a. by moving away from the equilibrium at an accelerating rate b. by moving to a new equilibrium c. by tending to move the system back to its original equilibrium d. by amplifying the original perturbation e. in a density-independent manner Answer: c 2. We talked in class about competition as a possible source of positively density- dependent mortality in natural populations (i.e., mortality increases as density increases). But, there are other sorts of processes that can occur within many natural populations that can generate very different sorts of density dependent processes. For example, in many populations of sexually reproducing organisms, it can be difficult for individuals to find mates when the population density gets very low. a. Draw a graph of birth rate versus population density for a sexually reproducing organism in which mates become hard to find at low population densities. Assume that competition for resources is not important.
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This note was uploaded on 04/22/2011 for the course BIS 2B taught by Professor Strong during the Winter '08 term at UC Davis.

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Lecture%209%20answers - Answers to study questions Lecture...

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