Exam 14: Predation
Which of the following is a positive numerical response made by a predator in response to an increase in prey density?
C
Discuss the costs and benefits of each of the three hunting methods employed by predators.
The three main hunting methods employed by predators are ambush hunting, pursuit hunting, and stalking hunting. Each method has its own costs and benefits.
Ambush hunting involves predators lying in wait for their prey and then quickly pouncing on them. The benefit of this method is that it requires minimal energy expenditure and can be very effective if the predator is well-camouflaged and patient. However, the cost is that it may require a long wait for the prey to come within striking distance, and there is no guarantee of success.
Pursuit hunting involves predators chasing down their prey over a distance. The benefit of this method is that it can result in a high success rate if the predator is fast and has good endurance. However, the cost is that it requires a lot of energy and can be risky if the prey is also fast and agile.
Stalking hunting involves predators stealthily approaching their prey before launching a surprise attack. The benefit of this method is that it can result in a high success rate if the predator is able to get close enough without being detected. However, the cost is that it requires patience and skill, and there is a risk of the prey escaping if the predator is not careful.
In conclusion, each hunting method has its own costs and benefits, and predators may employ a combination of these methods depending on their species and the specific characteristics of their prey. Ultimately, the success of a hunt depends on a predator's ability to adapt its hunting strategy to the circumstances and to capitalize on its strengths while minimizing its weaknesses.
Unlike a scavenger, a predator is a heterotroph.
False
Carnivores can have an indirect, positive effect on plants by reducing populations of herbivores.
Which of the following is NOT considered an evolved defence of prey against predators?
Which of the following is NOT a class of plant secondary compounds?
Predators can influence prey only through lethal, rather than nonlethal, effects.
As lynx populations increase, snowshoe hare populations ________ and browse vegetation populations ________.
Quantitative inhibitors may constitute up to 60% of the dry weight of a leaf.
The response of a predator's consumption rate to prey density is a key factor as to whether a predator can regulate a prey population.
According to the marginal value theorem, the amount of time a predator spends foraging in a patch will vary with resource quality and the time required to extract the resource.
The trade-off between conflicting demands faced by a predator is described by the ________ theory.
Use a graph to illustrate the differences among the three types of functional responses. Explain the importance of the time a predator spends searching and handling prey to the different functional response types. In which functional responses can predators regulate prey populations and how?
According to the optimal foraging theory, a predator will select prey 1 (P₁)over prey 2 (P₂)when
The recognition of a particular species by a predator is called the ________ image.
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