Males of lined seedeaters suggest the nest site, but do not build the nest

Ferreira, Dalila de Fátima; Cunha, Filipe Cristovão Ribeiro da; Lopes, Leonardo Esteves

doi:10.1163/1568539x-bja10151

Cited by 1 publication

(1 citation statement)

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“…Lined Seedeater males are responsible for suggesting nest site to females. 40 Hence, due to their inexperience in choosing better nesting sites, brownish males may offer lower reproductive output. However, still little is known about nest predators and which factors influence nest predation in the study species.…”

Section: Discussionmentioning

confidence: 99%

Male plumage colouration predicts female reproductive investment and nestling survival in a colour dimorphic tropical songbird

Ferreira

Cunha

Lopes

2023

Avian Biology Research

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In sexually colour dimorphic bird species, males can exhibit phenotypic variation, with males breeding in either dull female-like plumage or brightly coloured plumage. Two contradictory hypotheses predict that the male phenotype variation can influence the female investment in a given breeding attempt. Whereas females usually prefer males in bright coloured plumage, the “differential allocation hypothesis” predicts that females should invest more in their reproductive output when mating with them; while the “compensatory investment hypothesis” predicts that females should invest more when mating with non-preferred males. To test those predictions, we analysed reproductive data for two consecutive breeding seasons (2018–2019 and 2019–2020) of Lined Seedeaters Sporophila lineola. S. lineola is a socially monogamous songbird species in which males exhibit two breeding phenotypes, a black-and-white plumage being the most common, and a less common female-like brownish plumage. Our findings show that females mated with brownish males have a higher reproductive investment (i.e., egg volume) than those mated with black-and-white males. Despite the lower investment of females in egg volume, our results showed that black-and-white males have a higher nestling survival, producing more hatchings and fledglings per season than brownish males, which could suggest a higher fitness. Our findings indicate that investment allocation on the eggs and offspring survival rates can be attributed to the plumage colour of males.

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Section: Discussionmentioning

confidence: 99%