Quality of food source affects female visitation and display rates of male Broad-tailed Hummingbirds
Abstract
Abstract I studied the relationships among energy availability, female visitation rates, and male display rates in Broad-tailed Hummingbirds (Selasphorus platycercus). Feeders contained 10%, 20%, or 30% sucrose solutions; female visitation rates and male hummingbird display rates were measured. Display rates of male Broad-tailed Hummingbirds and visitation rates of females depended on the quality of the food source. The fact that male display rates matched female visitation rates provides further evidence that dive displays play a role in courtship. More work needs to be done to determine if the relationship between resource quality, female visitation, and male display rates shows a threshold contingent on food availability. La Calidad de los Recursos Alimenticios Afecta las Tasas de Visita de las Hembras y de Despliegues de Cortejo de los Machos en Selasphorus platycercus Resumen. Evalué las relaciones entre la cantidad de energía disponible, la tasa de despliegues de cortejo por parte de los machos y la tasa de visita por parte de las hembras en Selasphorus platycercus. Para los comederos utilicé soluciones de agua azucarada en concentraciones de 10%, 20% ó 30%, y medí las tasas de visita de las hembras y de despliegues de cortejo de los machos en cada período de observación (1 hora por período). Las tasas de cortejo de los machos y de visita de las hembras dependieron de la calidad de los recursos alimenticios. El hecho de que las tasas de despliegue de los machos se relacionaran directamente con las tasas de visita de las hembras indica la importancia de los despliegues de caída libre durante el cortejo en esta especie. Se necesitan más investigaciones para determinar si la relación entre la calidad de recursos alimenticios, las visitas de las hembras y las tasas de despliegue presenta un límite relacionado con la disponibilidad de alimento por encima del cual la forma de esta relación se modifica.
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