Behavioral Ecology and Sociobiology

, Volume 66, Issue 6, pp 855–864

Adoption and cuckoldry lead to alloparental care in the tessellated darter (Etheostoma olmstedi), a non-group-living species with no evidence of nest site limitation

  • Kelly A. Stiver
  • Stephen H. Wolff
  • Suzanne H. Alonzo
Original Paper

DOI: 10.1007/s00265-012-1334-3

Cite this article as:
Stiver, K.A., Wolff, S.H. & Alonzo, S.H. Behav Ecol Sociobiol (2012) 66: 855. doi:10.1007/s00265-012-1334-3

Abstract

While extensive empirical and theoretical work has focused on the evolution of costly cooperation (particularly in group-living species), less attention has been paid to more low-risk or immediately beneficial forms of cooperation. In some non-group-living darters, alloparental care (or allocare) by subordinates has been noted to result from by-product benefits as small territorial (subordinate) males adopt and provide care to the abandoned eggs of large territorial (dominant) males. In the tessellated darter (Etheostoma olmstedi), allocare also results from sneak fertilization. However, information on the rate of allocare by tessellated darters is contradictory: prior behavioral work suggested that it is very common, while a genetic examination showed males to primarily care for their own young. We found behavioral and genetic evidence of very high levels of allocare at our study location. The relative size of the assigned fathers of young to the alloparental male is consistent with the idea that initial allocare primarily results from sneak fertilization (“cuckoldry-based allocare”), but later allocare results from subordinate males caring at previously abandoned nests (“adoption-based allocare”). Larger males appeared to breed more frequently at different nests, but did not father more individual offspring than smaller males. Finally, low relatedness between abandoning and alloparenting males suggests that kin selection does not contribute to alloparental care. We discuss how variation in nest availability may explain the inconsistent findings of the rate of alloparental care in the tessellated darter, and how increased research in this and similar systems can expand our understanding of the evolution of cooperation.

Keywords

CooperationSocial evolutionBy-product benefitsParentageEcological constraintsKin selection

Supplementary material

265_2012_1334_MOESM1_ESM.pdf (198 kb)
ESM 1(PDF 197 kb)

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Kelly A. Stiver
    • 1
  • Stephen H. Wolff
    • 2
  • Suzanne H. Alonzo
    • 1
  1. 1.Department of Ecology and Evolutionary Biology, Osborn Memorial LaboratoriesYale UniversityNew HavenUSA
  2. 2.Department of EconomicsRice UniversityHoustonUSA