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Spatial and temporal population differences in male density and condition in the American rubyspot, Hetaerina americana (Insecta: Calopterygidae)

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Ecological Research

Abstract

Increased resource availability should favor higher animal density. It may also affect sex ratio, the male condition, and mating competition over access to females, although the direction of these variables is not straightforward to predict. Using a non-experimental approach, we carried out preliminary research using the territorial American rubyspot (Hetaerina americana) by comparing two spatially separated populations and the same population in two different seasons (each comparison with varying population densities). We first compared the sex ratio by counting males (using two categories, territorial and non-territorial) and females; relative foraging time (as an indicator of how much feeding resources each site provides); wing spot size (a sexual ornament), body size and immune melanization response (these two variables were used to assess male condition); and fighting time and contest number (to assess competition). For the seasonal comparison we used a third population in which we only compared male spot size and two indicators of condition and immune response, phenoloxidase (PO) and nitric oxide (NO) activity. The high-density population had higher values of non-territorial males (but similar sex ratio), relative foraging time, contest time and number, wing spot (but similar body size) and melanization response than the low-density population. According to season, at high density, males had higher values of wing spots, PO, and NO. Our results suggest that in a population where animals have more dietary resources, males reach a better condition despite the competition being more intense.

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Acknowledgments

We would like to thank Norma E. Martínez Lendech and Iván S. Sánchez Martínez for their help in the field, the Comisariado Ejidal de Alpuyeca for the facilities to collect inside Palo Bolero. This research was funded by PAPIIT (projects IN211506 and IN230603; Universidad Nacional Autónoma de México). We also thank Raúl I. Martínez Becerril and Julie Irons for their help in the preparation of this manuscript and Gina Raihani for correcting our English grammar. When using our study animals we adhered to the Mexican ethical standards for the use of animals in research. Finally, we thank Masakado Kawata for his enriching and critical comments.

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Authors and Affiliations

  1. Unidad de Entomología Aplicada, Instituto de Ecología, A. C., Km. 2.5 Ant. Carr. a Coatepec no. 351, Congregación El Haya, 91070, Xalapa, Veracruz, Mexico

    Jorge Contreras-Garduño

  2. Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Apdo. Postal 70-275, Ciudad Universitaria, 04510, Mexico D.F, Mexico

    Jorge Canales-Lazcano, Jesús Guillermo Jiménez-Cortés, Nahum Juárez-Valdez & Alex Córdoba-Aguilar

  3. Centro de Investigación Sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública, Avda. Universidad 655. Col. Sta. María Ahuacatitlán, 62508, Cuernavaca, Morelos, Mexico

    Humberto Lanz-Mendoza

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  1. Jorge Contreras-Garduño
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Correspondence to Alex Córdoba-Aguilar.

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Contreras-Garduño, J., Canales-Lazcano, J., Jiménez-Cortés, J.G. et al. Spatial and temporal population differences in male density and condition in the American rubyspot, Hetaerina americana (Insecta: Calopterygidae). Ecol Res 24, 21–29 (2009). https://doi.org/10.1007/s11284-008-0476-2

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  • DOI: https://doi.org/10.1007/s11284-008-0476-2

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