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Brood parasitism occurs when a species, such as a cuckoo, lays its eggs in the nest of another species, relying on them to raise its young.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Parasitism and Commensalism
Brood parasitism occurs when one species lays its eggs in another speciesâ nest, such as cuckoos laying eggs in crow nests.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Parasitism and Commensalism
Brood parasitism occurs when one species lays its eggs in another species' nest, as seen in cuckoos using crow nests for incubation.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Parasitism and Commensalism
Brood parasitism occurs when a cuckoo deposits eggs in another bird's nest and shifts incubation and chick-rearing costs to the host. A crow may spend energy feeding the cuckoo chick, lose its own offspring through eviction or competition, and suffer reduced reproductive success, while the cuckoo gains parental care without providing it. This asymmetric fitness outcome is (+,-), characteristic of parasitism. It is not commensal because the host is harmed, not mutualistic because benefits are not reciprocal, and not altruistic because the cuckoo gains rather than pays a fitness cost. Host recognition and egg mimicry can subsequently coevolve through reciprocal selection. A careful interpretation retains the assumptions of the underlying model and avoids extending it beyond available evidence. Within those assumptions, the keyed concept gives the most consistent account of the biological pattern and its expected outcome. This interpretation follows ecological definitions based on effects on fitness, energy flow, behavior, and population performance. It also shows why superficially similar alternatives can represent different mechanisms once the direction of benefit, harm, or resource transfer is considered.
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 8-13
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