Reproductive seasonality of seven neotropical passerine species

Wikelski, Martin; Hau, Michaela; Robinson, W. Douglas; Wingfield, John C.

Reproductive seasonality of seven neotropical passerine species

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Date

2003

Authors

Wikelski, Martin

Hau, Michaela

Robinson, W. Douglas

Wingfield, John C.

DOI (citable link)

10.1650/7251

Collections

Biologie

Title in another language

Estacionalidad Reproductiva de Siete Especies Passeriformes Neotropicales

Publication type

Journal article

Publication status

Published

Published in

The Condor : Ornithological Applications ; 105 (2003), 4. - pp. 683-695. - ISSN 0010-5422. - eISSN 1938-5129

Abstract

We investigated gonad sizes, nesting patterns, and plasma hormone concentrations of seven Neotropical passerine species in a lowland tropical rainforest (Panama) at 9°N latitude over at least one annual cycle. All species had entirely regressed gonads for several months of the year (October to January), coinciding with the end of heavy rainfall. Gonadal recrudescence started in the dry season between January and March. Nesting began earlier (March) for open-habitat species than for forest-interior species (April), and lasted until August or December, respectively. Species differed widely in maximal relative testes sizes and reproductive hormone concentrations, but both measures were lower than in most temperate-zone species. Although we cannot provide a phylogenetically controlled comparison, polygynous and group-living species appeared to have larger testes than monogamous species, possibly indicating sperm competition. Testosterone concentrations were highest in polygynous species, intermediate in socially monogamous species, and lowest in a group-living species, indicating that testosterone is more influenced by social systems than by gonad cycles. Tropical birds may generally maintain low testosterone concentrations and relatively small gonads to decrease overall energy expenditure compared to temperate-zone relatives.

Summary in another language

Investigamos los tamaños de las gónadas, los patrones de nidificación y las concentraciones hormonales plasmáticas de siete especies de aves paserinas Neotropicales en una selva lluviosa tropical de tierras bajas en Panamá (9°N) durante por lo menos un ciclo anual. Todas las especies tenían gónadas enteramente retraídas por varios meses del año (octubre a enero), coincidiendo con el fin del periodo de precipitación lluviosa pesada. El crecimiento gonadal comenzó en la estación seca, entre enero y marzo. La nidificación comenzó primero en las especies de hábitat abierto (marzo) que en las especies de interior de bosque (abril) y duró hasta agosto y diciembre, respectivamente. Las especies difirieron extensamente en los tamaños relativos máximos de las gónadas y en las concentraciones de la hormona reproductiva, aunque ambas medidas fueron menores que para la mayoría de las especies de la zona templada. Aunque no podemos proveer una comparación controlada por filogenia, las especies poliginias y las especies que viven en grupo tenían testículos más grandes que las especies monógamas, lo que posiblemente podría estar indicando competencia espermática. Las concentraciones de testosterona fueron mayores en las especies poliginias, intermedias en las socialmente monógamas, y menores en las especies que viven en grupo, indicando que la testosterona estaría más influenciada por el sistema social que por los ciclos de las gónadas. Las aves tropicales podrían generalmente mantener niveles bajos de testosterona y tamaños relativamente pequeños de gónadas con el fin de disminuir los gastos energéticos totales en comparación a las especies emparentadas de las zonas templadas.

Subject (DDC)

570 Biosciences, Biology

Keywords

breeding season, gonad cycles, hormones, Panama, rainforest, seasonality, tropical

Cite This

ISO 690

WIKELSKI, Martin, Michaela HAU, W. Douglas ROBINSON, John C. WINGFIELD, 2003. Reproductive seasonality of seven neotropical passerine species. In: The Condor : Ornithological Applications. 105(4), pp. 683-695. ISSN 0010-5422. eISSN 1938-5129. Available under: doi: 10.1650/7251

BibTex

@article{Wikelski2003Repro-42608,
  year={2003},
  doi={10.1650/7251},
  title={Reproductive seasonality of seven neotropical passerine species},
  number={4},
  volume={105},
  issn={0010-5422},
  journal={The Condor : Ornithological Applications},
  pages={683--695},
  author={Wikelski, Martin and Hau, Michaela and Robinson, W. Douglas and Wingfield, John C.}
}

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