Title: Unit 8 Quiz
Course: BIS 205 Field Ecology - Copy > Section: BIS 205 Field Ecology - Copy

Q: Bats have an impact on cotton farming in the Southern US by
- consuming crops and reducing productivity.
- preying on crop pests.
- preying on crop pests and thereby reducing pesticide applications.
- preying on insects that help control cotton pests.
- acting as parasites on species that damage crops.
A: preying on crop pests and thereby reducing pesticide applications.

Q: An organism that causes disease in their host is called a [_____]
A: pathogen

Q: Imagine you are studying a very simple zooplankton community in a southern Illinois strip mine lake. Because of the low pH, the lake has no fish. There are two species of zooplankton in which one replaces the other in fall. Scapholebris lives through the summer and into fall when it is replaced by Brachionus. Design a series of experiments to test whether predation, competition, or simple physiological limitation causes this change of species. Keep in mind, although there are no fish predators, it does not mean that there are no predators.

Q: A species feeding on the tissue of its host, while not killing it directly, is a
- parasitoid
- predator
- parasite
- phototaxis
- cannibal
A: parasite

Q: Thomas Park and colleagues showed that the presence of a parasite of flour beetles (Tribolium castaneum and Tribolium confusum)
- can reverse the predicted outcomes of competition
- decreases the likelihood both species coexist
- increases the likelihood of coexistence
- causes the extinction of both species
- has no impact on the effects of competition
A: can reverse the predicted outcomes of competition

Q: When Gause initially tried to test the Lotka-Volterra predation model experimentally, he failed to find support of it because
- Didinium in an inefficient predator
- Paramecium was effective at avoiding predation
- Didinium was too effective of a predator and eliminated Paramecium
- Parasites contaminated the aquaria
- The model only works with large mammals
A: Didinium was too effective of a predator and eliminated Paramecium

Q: Parasites, such as Plagiorhynchus cylindraceus and Puccinia monoica, alter their host's behavior in order to
- increase the likelihood of transmission to the next host
- increase the host's reproduction, resulting in more infected offspring
- increase how long they can survive in their host
- decrease the mortality risk in their host
- decrease the chance of their host acquiring another parasite
A: increase the likelihood of transmission to the next host

Q: The Lotka-Volterra predation model predicts a prey population would respond in what manner if there was an absence of predators?
- Logistic growth
- Sigmoidal growth
- Exponential growth
- Exponential growth followed by a crash
- Decline over time until extinction
A: Exponential growth

Q: In the Lotka-Volterra predation model, the number of predator deaths is represented by
- c
- p
- d_p
- d_pN_p
- dN_p/dt
A: d_pN_p

Q: Which of the following predator-prey species have exhibited a well known pattern of repeated coupled oscillations in population sizes.
- Cicada and elm tree
- Lynx and snowshoe hare
- Sea lamprey and trout
- Brazilian free tailed bat and bollworm
- Barnacles in the genus Cerithidea and Batillaria
A: Lynx and snowshoe hare

Q: What is the effect of predator satiation on the number of prey killed?
- It has no effect on the number of prey killed.
- It increases the number of prey killed at high prey densities.
- It decreases the number of prey killed at high prey densities.
- It decreases the number of prey killed at low prey densities.
A: It decreases the number of prey killed at high prey densities.

Q: In most laboratory experiments, it is easy to observe predators and prey held together in simple habitats displaying repeated cycles of population sizes.
- True
- False
A: False

Q: Which of the following could act as a refuge for prey?
- A region of the habitat the predator cannot enter
- A region of the habitat that is isolated and unlikely for predators to find
- Large numbers of prey making it difficult for predators to effectively attack
- Prey that can outgrow the size predators can handle
- All of the above
A: All of the above

Q: The decrease in probability of being eaten at high populations of prey is due to [_____].
A: predator satiation

Q: The reintroduction of wolves into Yellowstone park has altered elk behavior. This is known as
- a parasite-host relationship.
- a combined response.
- positive phototaxis.
- "the ecology of fear."
- predator satiation.
A: "the ecology of fear."