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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.)

Devoted fathers or selfish lovers? Conflict between mating effort and parental care in a harem-defending arachnid

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Alissa, L. M. ; Muniz, D. G. ; Machado, G.
Total Authors: 3
Document type: Journal article
Source: JOURNAL OF EVOLUTIONARY BIOLOGY; v. 30, n. 1, p. 191-201, JAN 2017.
Web of Science Citations: 3

When there is a temporal trade-off between mating effort and parental care, theoretical models predict that intense sexual selection on males leads to reduced paternal care. Thus, high-quality males should invest more in mating effort because they have higher chances of acquiring mates, whereas low-quality males should bias their investment towards parental care. Once paternal care has evolved, offspring value should also influence males' decisions to invest in offspring attendance. Here, we performed a manipulation under field conditions to investigate the factors that influence male allocation in either mating effort or parental care. We predicted that facultative paternal care in the harem-holding harvestman Serracutisoma proximum would be negatively influenced by male attractiveness and positively influenced by offspring value. We found that attractive males were less likely to engage in egg attendance and that the higher the perceived paternity, the higher the caring frequency. Finally, egg mortality was not related to caring frequency by males, but predation pressure was much lower than that recorded in previous studies with the same population. Thus, the benefits of facultative male care may be conditional to temporal variation in the intensity of egg predation. In conclusion, males adjust their investment in either territory defence or egg attendance according to their recent mating history and perceived paternity. Our findings suggest that exclusive paternal care can evolve from facultative paternal care only if the trade-off between mating effort and parental care is circumvented. (AU)

FAPESP's process: 12/23022-7 - Trade-off between parental and mating effort in the harvestman Serracutisoma proximum (Arachnida: Opiliones): devoted fathers or selfish lovers?
Grantee:Louise Alissa de Morais
Support type: Scholarships in Brazil - Scientific Initiation
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: 15/10448-4 - Interplay between paternal care and sexual selection in harvestmen
Grantee:Glauco Machado
Support type: Regular Research Grants