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#organism examples

2 public questions tagged with this topic.

Population Regulation

Which organism exhibits semelparity?

Coho salmon are semelparous: adults migrate to freshwater, invest heavily in one spawning season, and die after reproduction. Their stored energy is spent on migration, competition, nest construction, gamete production, and defense rather than future survival. Loggerhead turtles and long-lived trees generally reproduce in multiple years, making them iteroparous. Selection can favor a large terminal effort when future survival is poor or when concentrating resources yields accelerating fecundity gains. Repeated breeding is favored when adults commonly survive and spreading reproduction buffers

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

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Population Ecology

Which organism is NOT semelparous?

The keyed exception is “Dracena.” In the context of which organism is not semelparous, that statement differs from the governing ecological pattern and must be evaluated against the mechanism rather than accepted from wording alone. Survivorship curves summarize age-specific mortality: Type I concentrates loss late in life, Type II approximates a constant hazard, and Type III concentrates loss early. They are empirical patterns, not rigid taxonomic rules. The remaining alternatives—“Bamboo”, “Cicada”, “Mayfly”—refer to different states, processes, or scales and therefore do not express the sam

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

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