Predator-Prey Strategies

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Questions and Answers

What primarily limits a generalist predator's choice of prey?

  • The experience of the predator in hunting
  • Energy used to catch prey and calorie gain (correct)
  • The number of predators in the area
  • The time of year and weather conditions

What factor controls the population size of owls, according to the information provided?

  • Competition with other predators
  • Abundance of prey species alone
  • Seasonal changes in climate
  • Availability of territories (correct)

How do climatic factors affect lion populations in the Serengeti?

  • They regulate the birth rates of the prey species
  • They determine the number of available mates
  • They control survival during dry seasons (correct)
  • They cause migrations to new territories

What happens to a predator's feeding behavior when a particular prey type becomes abundant?

<p>The predator will prioritize that prey type. (D)</p> Signup and view all the answers

What is the typical response of a predator when the population of its primary prey species is reduced?

<p>The predator will switch to a secondary prey species. (C)</p> Signup and view all the answers

What is a characteristic of energy maximisers among predators?

<p>They require frequent catching of food. (A)</p> Signup and view all the answers

Which of the following best describes time minimizers in predator strategies?

<p>They spend little energy and can survive with minimal food. (C)</p> Signup and view all the answers

What defines a specialist predator?

<p>They focus on a small number of prey and become highly efficient at catching them. (A)</p> Signup and view all the answers

Which predator relies primarily on snowshoe hares for its diet?

<p>Canadian lynx (A)</p> Signup and view all the answers

What type of energy strategy do active hunters use?

<p>Energy maximization (B)</p> Signup and view all the answers

How do antlions catch their prey?

<p>By waiting in ambush in pits. (D)</p> Signup and view all the answers

What effect do lynxes have on snowshoe hare populations?

<p>Lynxes control hare populations, causing oscillations. (C)</p> Signup and view all the answers

Which predator is considered a key predator for controlling prey populations?

<p>Canadian lynx (B)</p> Signup and view all the answers

What is a primary factor that allows different predator species to coexist?

<p>Specialization in hunting methods (C)</p> Signup and view all the answers

Which predator uses its speed to specialize in catching prey?

<p>Cheetah (C)</p> Signup and view all the answers

What is one of the benefits of group living for prey animals?

<p>Improved predator detection (B)</p> Signup and view all the answers

How do crows utilize group defense against predators?

<p>They attack the predator collectively (C)</p> Signup and view all the answers

What hunting strategy do hunting dogs use to catch large prey?

<p>Running until the prey collapses (A)</p> Signup and view all the answers

Which prey strategy is NOT mentioned as a way to reduce predation?

<p>Camouflaging with surroundings (C)</p> Signup and view all the answers

What characteristic allows zebras to effectively participate in group defense?

<p>Exceptional eyesight (C)</p> Signup and view all the answers

What is a disadvantage of group living for prey animals?

<p>Higher competition for food (B)</p> Signup and view all the answers

Flashcards

Energy Maximizer Predator

Predators who actively hunt and capture prey using energy-intensive methods. They often target the weakest prey for easier capture.

Time Minimizer Predator

Predator species that conserve energy by waiting for prey to come to them. They often have a wide range of prey types.

Specialist Predator

Predators that specialize in hunting a limited number of prey species, usually just one. This allows them to develop highly efficient methods for catching their preferred targets.

Key Predator

Predators that have a significant impact on the population size of their prey, controlling their numbers.

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Non-Key Predator

Predators whose impact on their prey populations is minimal.

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Predator-Prey Oscillation

The interaction between predator and prey populations where their size fluctuates in response to each other.

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Predator Adaptability

The ability of a predator to adapt and successfully hunt a variety of prey species.

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Predator Prey Selection

The way a predator chooses its prey, often targeting weak or vulnerable individuals.

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Generalist Predator

A predator that eats a wide variety of prey items, not specializing in any one type.

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Generalist Predator Abundance Control

The abundance of a generalist predator's population can be controlled by other factors besides prey abundance. These factors might include territory availability, climate, or resources.

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Specialist Predator Abundance Control

The abundance of a specialist predator's population is strongly influenced by the availability of their specific prey.

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Predator-Prey Fluctuations

Both predator and prey populations can fluctuate over time, with the predator's population often lagging behind changes in the prey population.

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Predator Niches

Different predator species share the same environment by specializing in different types of prey, reducing competition and ensuring survival.

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Hunting Specialization

The ability of a predator to catch specific prey types based on its size and hunting techniques.

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Prey Strategies

The ability of prey species to avoid being caught by predators, ensuring their survival.

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Group Living

When prey animals live in groups, they gain the advantage of increased vigilance, making it harder for predators to single out individuals.

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Group Defense

Prey animals in a group can work together to drive away or confuse a predator, increasing their chances of survival.

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Combined Sensory Advantage

Prey animals like zebra, wildebeest, and antelope have different strengths when it comes to detecting predators, making their combined senses more comprehensive.

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Confusion in Group Defense

When a predator focuses on one prey, the rest of the group has a chance to escape, and the predator may end up with nothing.

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Center of the Herd

The individuals at the center of a herd are safer than those on the edges, as they constantly exchange positions, reducing risk for everyone.

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Study Notes

Predator Strategies and Prey Populations

  • Predator strategies vary in the energy used for hunting, categorized as energy maximizers (high energy) and time minimizers (low energy)

  • Energy maximizers actively hunt their prey, requiring frequent catches to replenish energy

  • Time minimizers are inactive predators who wait for prey to come to them

  • Time minimizers use little energy and must be adaptable

  • Predators also vary in the number of prey types they consume, categorized into specialists (few prey types) and generalists (many prey types)

  • Specialists feed on a limited number of prey, maximizing efficiency in finding and catching that specific prey

  • Generalists feed on a large variety of prey, limiting their choice due to energy expenditure and prey size.

Prey Strategies

  • Prey employ various strategies to evade predators and maintain population numbers
  • Prey with highly developed senses are better able to detect predators from a distance
  • Speed is a crucial defensive mechanism for some prey species
  • Hiding is a common defensive strategy
  • Some prey possess defense mechanisms like being poisonous or venomous
  • Group living, such as herds or flocks, can enhance predator avoidance due to increased predator detection capabilities.

Predator-Prey Interactions

  • Predator and prey populations often fluctuate in cycles
  • Lynx and snowshoe hare populations show a notable 9-11 year cycle
  • Prey abundance often influences predator population size. If a prey population crashes, so will its predator
  • A predator may switch to a different prey if its primary prey becomes scarce
  • Competition between predators can lead to specialization of hunting strategies
  • Different hunting strategies can allow coexistence of predators.

Prey Population Abundance

  • Generalist predators are influenced by factors other than prey abundance, such as territory availability and survival during unfavorable seasons (e.g., dry season).
  • Prey abundance can affect the predator's food choice, with predators concentrating their efforts on the most abundant prey types.

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