What factors might favor the evolution of semelparity versus iteroparity in different species of salmon?

A number of factors such as changes in water temperature, size at reproduction, energy loss during reproduction, and post reproductive feeding may significantly affect post reproductive mortality (Baird et al., 1986, 1987.

What is semelparity versus iteroparity?

Living things have two different reproductive options: semelparity and iteroparity. A species is categorized as iteroparous if it experiences several reproductive cycles throughout its existence, and semelparous if it exhibits just one reproductive event before passing away

In truly semelparous species, death following reproduction is a component of a larger plan that includes optimizing reproduction at the expense of future existence. There will always be some iteroparous individuals who pass away between their first and second reproductive episodes, but this is not considered semelparity unless it is a symptom of a syndrome of programmed death after reproduction. Semelparity and iteroparity are extremes along a spectrum of potential methods rather than opposing ones strictly speaking.

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