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#life history traits

3 public questions tagged with this topic.

Population Ecology

Which of the following life history trait pairs is a trade-off?

“Offspring size and number” for which of the following life history trait pairs is a trade-off. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Mechanistic support comes from showing how resource limitation, enemies, mate availability, or physiological stress changes demographic performance. A descriptive association alone does not establish regulation or causation. The remaining alternatives—“Growth and dispersal”, “Lifespan and color”, “Habitat and territory”—refer to different states, processes

Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology

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Population Ecology

Which of the following is an r-selected trait?

“Early semelparity” for which of the following is an r-selected trait. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Mechanistic support comes from showing how resource limitation, enemies, mate availability, or physiological stress changes demographic performance. A descriptive association alone does not establish regulation or causation. The remaining alternatives—“High parental care”, “Low fecundity”, “Stable population size”—refer to different states, processes, or scales and therefore do no

Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology

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Population Ecology

Which of the following traits is NOT characteristic of r-selected tree species?

The keyed exception is “Strong density-dependent mortality.” In the context of which of the following traits is not characteristic of r-selected tree species, that statement differs from the governing ecological pattern and must be evaluated against the mechanism rather than accepted from wording alone. Interpretation must distinguish absolute population change from a per-capita rate and must state the time interval and population boundary. Age structure, dispersal, environmental variation, and delayed responses can all make observed trajectories depart from a simple model. The remaining alter

Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology

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