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#ecological assumptions

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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 therefore do not express the same causal relationship. 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. This distinction matters because similar surface patterns can arise through different mechanisms, whereas ecological prediction depends on identifying the mechanism that actually changes rates.

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

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Optimal diet models assume:

Optimal diet models assume that foraging choices can be evaluated through rates of energetic or fitness-related return, with energy gained relative to time spent searching and handling playing a central role. Prey are not assumed equal: they differ in energy, encounter rate, capture probability, and handling requirements. Handling time is explicitly important because profitability is often E/h. Prey densities may be treated as parameters during a short decision interval, but the biological premise is not that all densities are universally fixed. The model predicts ranked acceptance decisions that maximize long-term intake rate under stated constraints, providing a benchmark against which real behavior and additional risks can be compared. The alternatives can be separated by asking what changes for each participant and which process causes that change. That approach is more reliable than treating familiar examples as fixed labels, because many interactions shift with environmental context. From an evolutionary perspective, traits persist when their net effects improve inclusive or direct fitness under prevailing conditions. The ecological terminology therefore summarizes both an immediate mechanism and its likely consequences across generations.

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 10

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