bioRxiv preprint doi: https://doi.org/10.1101/107268; this version posted February 10, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 2 TITLE Between semelparity and iteroparity: empirical evidence for a continuum of modes of 4 parity 6 8 AUTHOR P. William Hughes 10 Max Planck Institute for Plant Breeding Research Carl-von-Linné-Weg 10 12 50829 Köln Email:
[email protected] 14 bioRxiv preprint doi: https://doi.org/10.1101/107268; this version posted February 10, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. ABSTRACT 16 The number of times an organism reproduces (i.e. its mode of parity) is a fundamental life-history character, and evolutionary and ecological models that compare 18 the relative fitness of strategies are common in life history theory and theoretical biology. Despite the success of mathematical models designed to compare intrinsic rates of 20 increase between annual-semelparous and perennial-iteroparous reproductive schedules, there is widespread evidence that variation in reproductive allocation among semelparous 22 and iteroparous organisms alike is continuous. This paper reviews the ecological and molecular evidence for the continuity and plasticity of modes of parity—that is, the idea 24 that annual-semelparous and perennial-iteroparous life histories are better understood as endpoints along a continuum of possible strategies.