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1 January 2000 DOES EVOLUTION OF ITEROPAROUS AND SEMELPAROUS REPRODUCTION CALL FOR SPATIALLY STRUCTURED SYSTEMS?
Esa Ranta, David Tesar, Susanna Alaja, Veijo Kaitala
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Abstract

A persistent question in the evolution of life histories is the fitness trade-off between reproducing only once (semelparity) in a lifetime or reproducing repeated times in different seasons (iteroparity). The problem can be formulated into a research agenda by assuming that one reproductive strategy is resident (has already evolved) and by asking whether invasion (evolution) of an alternative reproductive strategy is possible. For a spatially nonstructured system, Bulmer (1994) derived the relationship v PA < 1 (PA is adult survival; vbS and bS are offspring numbers for iteroparous and semelparous breeding strategies, respectively) at which semelparous population cannot be invaded by an iteroparous mutant. When the inequality is changed to v PA > 1, invasion of a semelparous mutant is not possible. From the inequalities, it is easy to see that possibilities for evolutionary establishment of a novel reproductive strategy are rather narrow. We extended the evolutionary scenario into a spatially structured system with dispersal linkage among the subunits. In this domain, a rare reproductive strategy can easily invade a population dominated by a resident reproductive strategy. The parameter space enabling invasion is far more generous with spatially structured evolutionary scenarios than in a spatially nonstructured system.

Corresponding Editor: D. Roff

Esa Ranta, David Tesar, Susanna Alaja, and Veijo Kaitala "DOES EVOLUTION OF ITEROPAROUS AND SEMELPAROUS REPRODUCTION CALL FOR SPATIALLY STRUCTURED SYSTEMS?," Evolution 54(1), 145-150, (1 January 2000). https://doi.org/10.1554/0014-3820(2000)054[0145:DEOIAS]2.0.CO;2
Received: 26 January 1999; Accepted: 1 August 1999; Published: 1 January 2000
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KEYWORDS
Annual and perennial plants
evolution
evolutionarily stable strategy
iteroparity
semelparity
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