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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A sexual network approach to sperm competition in a species with alternative mating tactics

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Muniz, Danilo G. [1, 2] ; Guimaraes, Jr., Paulo R. [2] ; Buzatto, Bruno A. [3] ; Machado, Glauco [2]
Total Authors: 4
[1] Univ Sao Paulo, Programa Posgrad Ecol, Dept Ecol, Inst Biociencias, BR-05508900 Sao Paulo - Brazil
[2] Univ Sao Paulo, LAGE, Dept Ecol, Inst Biociencias, BR-05508900 Sao Paulo - Brazil
[3] Univ Western Australia, Sch Anim Biol, Ctr Evolutionary Biol, Crawley, WA 6009 - Australia
Total Affiliations: 3
Document type: Journal article
Source: BEHAVIORAL ECOLOGY; v. 26, n. 1, p. 121-129, JAN-FEB 2015.
Web of Science Citations: 16

Alternative mating tactics are common among species exhibiting resource defense polygyny. While large territorial males aggressively defend harems, small sneaker males generally invade these harems to mate furtively. The result is a sexual network that provides information on the sperm competition intensity (SCI) faced by males of both morphs. Here, we use metrics derived from the network approach to compare SCI between sneakers and territorials of the male-dimorphic harvestman Serracutisoma proximum. We also tested hypotheses about the influence of harem size and spatial distribution of harems on the SCI faced by territorial males. Sneakers faced, on average, higher levels of SCI than territorials, while the SCI faced by territorials was more variable than that of sneakers. Owners of large harems faced less intense sperm competition than owners of small harems, suggesting that sperm competition is more diluted among females in large harems. At the population level, sneakers concentrated their invasions on neighboring harems that were spatially aggregated. We argue that the spatial distribution of harems is an important element influencing the topology of the sexual network, and that the spatially explicit approach we used here can bring new insights to the study of sperm competition and mating systems in a wide range of organisms. (AU)

FAPESP's process: 11/12795-2 - Effects of the availability of egg-laying sites on the mating system of the harvestman Serracutisoma proximum (Arachnida: Opiliones)
Grantee:Danilo Germano Muniz da Silva
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 12/50229-1 - Macroecology of sexual selection: large-scale influence of climate on sexually selected traits
Grantee:Glauco Machado
Support type: Regular Research Grants