Exam 12: Predation

Refer to the figure. - A new hypothetical species of green crabs is discovered that has a handling time of 2.4. Based on other green crabs' behavior, you hypothesize that the new species predator avoidance response index will be approximately

Based on Züst and his colleagues' findings, herbivory

Which statement about the study of the invasive Klamath weed and a leaf-feeding beetle is true?

In the salt marshes bordering the Hudson Bay, the addition of snow geese to areas with no snow geese would likely _______ the marshes because geese _______. The addition of more geese to areas that already have large numbers of geese would likely _______ the marshes.

Refer to the figure. -A student is asked to determine which species of green crab they have found based on the predator avoidance response index. After three independent trials, the average predator avoidance response index was determined to be 12. Which species has the student been studying?

Use the following simple predator-prey relationships to answer the question (assume no other interactions exist in this system): Mice eat grain grown by a farmer before it can be harvested. The mice are consumed by several species of snakes, which themselves are consumed by hawks. If the population of snakes were suddenly wiped out by disease, explain the long-term effects on the grain, mice, and hawk populations, and why these effects would be observed.

Suppose you are studying the effect of predation on levels of cortisol in a species of mouse in the lab. You set up an experiment in which you house some mice in cages with photographs of rabbits on the walls of their cages; others are housed with photographs of flowers on the walls of their cages; while others are housed with photographs of hawks. The cortisol level in mice blood plasma (nmol/L) after exposure to the photographs measures 190 for rabbits, 475 for hawks, and 185 for flowers. Why did you expose the mice to three different types of photographs? What type of relationship would an individual mouse have with the different plant/animal species pictured? Why did the hawk photograph result in the highest levels of cortisol?

How do Lembadion bullinum change in response to their prey?

Which statement best describes the relationship between snow geese and plants in the salt marshes that border the Hudson Bay?

You are studying two species in a community: a carnivorous predator and a herbivorous prey species. When analyzing the data, you realize the population size of the predators is very similar to the population size of the prey. What makes this unusual?