Carotenoid skin ornaments as flexible indicators of male foraging behavior in a marine predator: Variation among Mexican colonies of brown booby (Sula leucogaster)
Por:
Michael N.P., Torres R., Welch A.J., Felis J., Adams J., Bonillas-Monge M.E., Hodgson S., Lopez-Marquez L., Martínez-Flores A., Castro-Mejias G.E., Wiley A.E.
Publicada:
1 ene 2024
Resumen:
Carotenoid-dependent ornaments can reflect animals’ diet and foraging behaviors. However, this association should be spatially flexible and variable among populations to account for geographic variation in optimal foraging behaviors. We tested this hypothesis using populations of a marine predator (the brown booby, Sula leucogaster) that forage across a gradient in ocean depth in and near the Gulf of California. Specifically, we quantified green chroma for two skin traits (foot and gular color) and their relationship to foraging location and diet of males, as measured via global positioning system tracking and stable carbon isotope analysis of blood plasma. Our three focal colonies varied in which foraging attributes were linked to carotenoid-rich ornaments. For gular skin, our data showed a shift from a benthic prey-green skin association in the shallow waters in the north to a pelagic prey-green skin association in the deepest waters to the south. Mean foraging trip duration and distance of foraging site from coast also predicted skin coloration in some colonies. Finally, brown booby colonies varied in which trait (foot versus gular skin color) was associated with foraging metrics. Overall, our results indicate that male ornaments reflect quality of diet and foraging–information that may help females select mates who are adapted to local foraging conditions and therefore, are likely to provide better parental care. More broadly, our results stress that diet-dependent ornaments are closely linked to animals’ environments and that we cannot assume ornaments or ornament signal content are ubiquitous within species, even when ornaments appear similar among populations. © The Author(s) 2024.
Filiaciones:
Michael N.P.:
University of Akron, Akron, OH, United States
Torres R.:
Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico
Welch A.J.:
Durham University, Durham, United Kingdom
Felis J.:
Western Ecological Research Center, United States Geological Survey, Santa Cruz, CA, United States
Adams J.:
Western Ecological Research Center, United States Geological Survey, Santa Cruz, CA, United States
Bonillas-Monge M.E.:
Durham University, Durham, United Kingdom
Hodgson S.:
University of Akron, Akron, OH, United States
Lopez-Marquez L.:
Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico
Martínez-Flores A.:
Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico
Castro-Mejias G.E.:
Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico
Wiley A.E.:
University of Akron, Akron, OH, United States
Bowie State University, Bowie, MD, United States
hybrid, All Open Access; Hybrid Gold Open Access
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