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The potential for disruptive selection on growth rates across genetically influenced alternative reproductive tactics

In English

Författare

  • M. R. Morris
  • R. J. Friebertshauser
  • O. Rios-Cardenas
  • M. N. Liotta
  • J. K. Abbott

Summary, in English

A trade-off between survival to sexual maturity and mating success is common across alternative reproductive tactics (ARTs), and can lead to tactical disruptive selection on shared traits (i.e. positive selection gradient in one tactic, and negative selection gradient in another). We were interested in examining the theoretical possibility of tactical disruptive selection on intrinsic growth rate. The male ARTs in Xiphophorus multilineatus express two distinct life histories: “courters” optimize mating success by maturing later at larger size and coaxing females to mate, while “sneakers” optimize survival to sexual maturity by maturing earlier at a smaller size, using both coaxing and coercive mating behaviors. In addition to differences in mating behaviors, body length, body depth, and the pigment pattern vertical bars, courter males grow faster than sneaker males. We present a new hypothesis for differences in growth rates between genetically influenced ARTs. The “growth-maturity optimization” hypothesis suggests that ARTs with differences in the probability of surviving to sexual maturity may have different optimal growth rates, leading to tactical disruptive selection. We also present a simple model to suggest that when considering both a cost and benefit to faster growth, tactical disruptive selection on growth rates is theoretically possible. In our model, the value that determines when tactical disruptive selection on growth rate will occur is the increase in probability of survival to sexual maturity gained through faster growth multiplied by the cost of faster growth (reduced longevity). Finally, we present empirical evidence to support the prediction that faster growth has a cost in X. multilineatus: in a controlled laboratory setting, courter males that did not survive 1.2 years past sexual maturity grew faster as juveniles (14–70 days) than those that survived.

Publiceringsår

2016-06-01

Språk

Engelska

Sidor

519-533

Publikation/Tidskrift/Serie

Evolutionary Ecology

Volym

30

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Ecology

Nyckelord

  • Alternative reproductive tactics
  • Melanincortin-4 receptor gene
  • Mortality growth trade-off
  • Tactical disruptive selection
  • Xiphophorus
  • “Growth-maturity optimization” hypothesis

Status

Published

Forskningsgrupp

  • Genetics of Sex Differences

ISBN/ISSN/Övrigt

  • ISSN: 0269-7653