#Lotka-Volterra model

Lotka Volterra Model

Which of the following assumptions is made in Lotka–Volterra model?

“Environment is constant” for which of the following assumptions is made in lotka–volterra model. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Evidence should connect encounter rates or resource use to survival, growth, or reproduction. The ecological label follows that causal effect rather than superficial proximity between organisms. The remaining alternatives—“Resources are unlimited”, “Population growth is independent”, “Linear isoclines”—refer to different states, processes, or scales and

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13-14

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Lotka Volterra Model

Which is generally stronger?

“Intraspecific competition” for which is generally stronger. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Species interactions are classified by their net effects on the fitness of each participant, but those effects can change with density, resource supply, life stage, and environmental stress. Competition reduces access to shared limiting factors, whereas predation and parasitism transfer resources from victim to consumer. The remaining alternatives—“Interspecific competition”, “Mutualism”, “

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13-14

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Lotka Volterra Model

CSIR NET: For α = 1, β = 1.3, KA = 150, KB = 200, outcome will be:

“Species B wins” for csir net: for α = 1, β = 1.3, ka = 150, kb = 200, outcome will be. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Coexistence requires stabilizing differences that make each species limit itself more strongly than it limits its competitor, or an equalizing process that keeps fitness differences small. Without such mechanisms, persistent competitive asymmetry tends toward exclusion. The remaining alternatives—“Species A wins”, “Stable equilibrium”, “Unstable equilibrium”—refer

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13-14

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Lotka Volterra Model

In Lotka–Volterra equations, what does β represent?

“Effect of species 1 on species 2” for in lotka–volterra equations, what does β represent. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Species interactions are classified by their net effects on the fitness of each participant, but those effects can change with density, resource supply, life stage, and environmental stress. Competition reduces access to shared limiting factors, whereas predation and parasitism transfer resources from victim to consumer. The remaining alternatives—“Effect of sp

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13-14

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Lotka Volterra Model

When both isoclines cross, and interspecific competition < intraspecific, the result is:

“Stable coexistence” for when both isoclines cross, and interspecific competition < intraspecific, the result is. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Species interactions are classified by their net effects on the fitness of each participant, but those effects can change with density, resource supply, life stage, and environmental stress. Competition reduces access to shared limiting factors, whereas predation and parasitism transfer resources from victim to consumer. The remaining alt

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13-14

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Lotka Volterra Model

Species 1 wins when:

“α12 > α21” for species 1 wins when. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Coexistence requires stabilizing differences that make each species limit itself more strongly than it limits its competitor, or an equalizing process that keeps fitness differences small. Without such mechanisms, persistent competitive asymmetry tends toward exclusion. The remaining alternatives—“α21 > α12”, “K1 < K2”, “N1 is smaller”—refer to different states, processes, or scales and therefore do not express th

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13-14

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Lotka Volterra Model

If α12 = 0.5 and α21 = 0.5, the outcome is:

“Stable coexistence” for if α12 = 0.5 and α21 = 0.5, the outcome is. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Coexistence requires stabilizing differences that make each species limit itself more strongly than it limits its competitor, or an equalizing process that keeps fitness differences small. Without such mechanisms, persistent competitive asymmetry tends toward exclusion. The remaining alternatives—“Species 1 wins”, “Species 2 wins”, “Unstable coexistence”—refer to different states, p

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13-14

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Lotka Volterra Model

Which condition leads to stable coexistence of two species?

“Intraspecific competition > interspecific” for which condition leads to stable coexistence of two species. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Coexistence requires stabilizing differences that make each species limit itself more strongly than it limits its competitor, or an equalizing process that keeps fitness differences small. Without such mechanisms, persistent competitive asymmetry tends toward exclusion. The remaining alternatives—“Interspecific competition > intraspecific”, “Eq

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13-14

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Predator Prey Model

The prey isocline in Lotka-Volterra model represents:

A prey zero-growth isocline contains combinations of prey and predator densities for which the prey population’s instantaneous net growth is zero. In the basic Lotka–Volterra equation dN/dt = rN − aNP, setting the derivative to zero for positive N gives P = r/a. Below that predator density, prey births exceed losses to predation and prey increase; above it, prey decline. The isocline therefore summarizes how prey growth changes with predator density, which is the intended meaning of “prey population growth versus predator density.” It is not itself a predator-mortality relation or merely a pre

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 14

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Predator Prey Model

In the Lotka-Volterra model, oscillations in predator and prey numbers are:

Classical Lotka–Volterra predator–prey equations generate coupled cycles because each population changes the growth rate of the other. Prey increase when predators are scarce, creating more food and allowing predator numbers to rise after a lag. Increased predation then drives prey downward; food shortage subsequently reduces predators, permitting prey recovery. In the ideal deterministic model, trajectories form closed orbits around a neutrally stable equilibrium, and cycle amplitude depends on initial conditions. The oscillations are therefore linked rather than independent or random. They a

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 14

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