@article {308670,
	title = {Kin-selected cooperation without lifetime monogamy: human insights and animal implications.},
	journal = {Trends Ecol Evol},
	volume = {29},
	year = {2014},
	month = {2014 Nov},
	pages = {600-6},
	abstract = {<p>Recent phylogenetic analyses suggest that monogamy precedes the evolution of cooperative breeding involving non-breeding helpers. The rationale: only through monogamy can helper-recipient relatedness coefficients match those of parent-offspring. Given that humans are cooperative breeders, these studies imply a monogamy bottleneck during hominin evolution. However, evidence from multiple sources is not compelling. In reconciliation, we propose that selection against cooperative breeding under alternative mating patterns will be mitigated by: (i) kin discrimination, (ii) reduced birth-intervals, and (iii) constraints on independent breeding, particularly for premature and post-fertile individuals. We suggest that such alternatives require consideration to derive a complete picture of the selection pressures acting on the evolution of cooperative breeding in humans and other animals.</p>
},
	keywords = {Animals, Biological Evolution, Cooperative Behavior, Hominidae, Humans, Pair Bond, Phylogeny, Sexual Behavior, Sexual Behavior, Animal, Social Behavior},
	issn = {1872-8383},
	doi = {10.1016/j.tree.2014.09.001},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/25267298},
	author = {Kramer, Karen L and Russell, Andrew F}
}
