Niche CD RP CEP

Niche CD RP CEP

Species coexistence primarily due to:

“Niche differentiation and resource partitioning” for species coexistence primarily due to. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. A niche is the multidimensional set of abiotic conditions, resources, and biotic relationships under which a population can persist. The fundamental niche reflects physiological and resource limits, while the realized niche is modified by competitors, consumers, mutualists, and dispersal barriers. The remaining alternatives—“Genetic drift”, “Competitive exclus

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

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Niche CD RP CEP

Increased niche overlap generally:

“Leads to competitive exclusion” for increased niche overlap generally. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. A niche is the multidimensional set of abiotic conditions, resources, and biotic relationships under which a population can persist. The fundamental niche reflects physiological and resource limits, while the realized niche is modified by competitors, consumers, mutualists, and dispersal barriers. The remaining alternatives—“Enhances coexistence”, “Expands habitats”, “Causes gene

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

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Niche CD RP CEP

Character displacement typically:

“Decreases niche overlap” for character displacement typically. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Niche differentiation reduces overlap by separating species along resource, space, or time axes. Such partitioning can stabilize coexistence when each species performs relatively better under the conditions it uses most strongly. The remaining alternatives—“Increases competition”, “Results in extinction”, “Causes genetic drift”—refer to different states, processes, or scales and therefor

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

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Niche CD RP CEP

Competitive exclusion occurs when:

“Identical niches occupied” for competitive exclusion occurs when. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Niche differentiation reduces overlap by separating species along resource, space, or time axes. Such partitioning can stabilize coexistence when each species performs relatively better under the conditions it uses most strongly. The remaining alternatives—“Different niches occupied”, “Resources abundant”, “Predation increases”—refer to different states, processes, or scales and there

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

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Niche CD RP CEP

Niche differentiation allows species to:

“Reduce competition and coexist” for niche differentiation allows species to. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. A niche is the multidimensional set of abiotic conditions, resources, and biotic relationships under which a population can persist. The fundamental niche reflects physiological and resource limits, while the realized niche is modified by competitors, consumers, mutualists, and dispersal barriers. The remaining alternatives—“Merge genetically”, “Increase competition”, “Use

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

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Niche CD RP CEP

Realized niches smaller primarily due to:

“Competitive interactions” for realized niches smaller primarily due to. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. A niche is the multidimensional set of abiotic conditions, resources, and biotic relationships under which a population can persist. The fundamental niche reflects physiological and resource limits, while the realized niche is modified by competitors, consumers, mutualists, and dispersal barriers. The remaining alternatives—“Mutation rates”, “Genetic variability”, “High resource

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

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Niche CD RP CEP

Fundamental equals realized niche without:

“Competition and predation” for fundamental equals realized niche without. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. A niche is the multidimensional set of abiotic conditions, resources, and biotic relationships under which a population can persist. The fundamental niche reflects physiological and resource limits, while the realized niche is modified by competitors, consumers, mutualists, and dispersal barriers. The remaining alternatives—“Abiotic stress”, “Genetic drift”, “Natural selection

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

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Niche CD RP CEP

Coexistence through niche differentiation:

“Reduced competition” for coexistence through niche differentiation. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. A niche is the multidimensional set of abiotic conditions, resources, and biotic relationships under which a population can persist. The fundamental niche reflects physiological and resource limits, while the realized niche is modified by competitors, consumers, mutualists, and dispersal barriers. The remaining alternatives—“Competitive exclusion”, “Increased predation”, “Genetic dr

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

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Niche CD RP CEP

Niche overlap implies:

Niche overlap means that two species share some portion of resource use or environmental requirements. Greater overlap can increase the potential for competition when the shared resource is limiting, but overlap may be partial rather than identical. Identical resource use represents the extreme of complete overlap, not the general meaning of the term. Species can overlap on one axis, such as food type, while differing on another, such as feeding time or microhabitat. Conversely, measured overlap does not prove competition if resources are abundant. Completely separate niches imply zero overlap

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

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Niche CD RP CEP

Ecological compression occurs over:

Ecological compression is an immediate or short-term contraction of a species’ realized niche in response to competitors. Individuals alter behavior, habitat use, or diet within their existing capacities, and the change can reverse when the competitor disappears. Because no heritable evolutionary change is required, the process operates over ecological timescales—within lifetimes or across a few population cycles. Character displacement, in contrast, involves natural selection and genetic divergence over evolutionary time. Geological timescales concern large Earth-history processes, while “gen

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

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Niche CD RP CEP

Character displacement results in:

Character displacement produces divergence in heritable traits where ecologically similar species coexist. Competition makes phenotypes that rely less on the shared limiting resource relatively advantageous, so natural selection shifts trait distributions apart over generations. As morphology, behavior, or phenology diverges, resource-use overlap declines. Greater similarity or increased overlap would intensify competition and oppose the selective direction. Habitat size need not change; the species differentiate within the available environment. A convincing case requires more than sympatric

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

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Niche CD RP CEP

Resource partitioning involves:

Resource partitioning is the division of limiting resources among coexisting species, reducing overlap in resource use. Species may forage in different habitats, consume different food sizes, feed at different times, or exploit distinct parts of the same plant. Partitioning weakens direct competition because each species has access to a resource dimension in which it performs relatively well. It can arise through behavioral flexibility, phenotypic plasticity, or evolutionary divergence and character displacement. Increased overlap would be the opposite pattern and would generally intensify com

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

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