Biology - Ecology need ecology assignment done

Due April 24 Consumer Resource and Competition Problem Set Name:_________

Complete the following problems and turn in on D2L to the appropriate assignment folder on April 24 by 11:59 pm. 1) Two species of butterflies visit flowers to feed on nectar. One prefers to forage in the cooler

mornings while the other tends to forage at mid-day. At times, both species forage at the same time and place. Previous research has indicated that α12 = 1.2 and α21 = 1.1. On the graph below, draw the zero net growth isoclines for each species and identify the x and y intercepts for each. What is the outcome (or potentially several possible outcomes) of competition? For each species, is it competing more strongly with the other species or members of its own species? (10 points)

N2 N1 2) Two species occur in the same habitat. Individuals of species 1 have a greater competitive effect on individuals of the same species (i.e., intraspecific competition) than they do on individuals of the other species (i.e., interspecific competition). Individuals of species 2 have a greater effect on individuals of species 1 than on other individuals of species its own species. Draw a graph of the population of species one vs. the population of species 2 and use it to demonstrate what the result of this competition will be. Be sure to draw the zero net growth isoclines and identify the intercepts for the isoclines. Also, identify any stable or unstable equilibria. What are the relative sizes of the two interspecific competition coefficients? (i.e., What is the value of the coefficients relative to 1?) (10 points)

N2 N1

Due April 24 Consumer Resource and Competition Problem Set Name:_________

3) A. Below is a graph of the population sizes of a predator and its prey. The current population sizes are represented by the point in the graph. Draw the zero net growth isoclines for each population, and draw an arrow on the graph showing how you would expect the point to move in the immediate near future. (4 points)

NPredator r/c

d/ac NPrey

B. Draw a graph showing the general trends of prey population and predator population sizes over time. Be sure to draw a line for each population. Make sure the two lines are carefully placed to show how changes in one population lead to changes in the other. (4 points)

NPredator

Or NPrey Time