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Breeding in the monsoon: semi-annual reproduction in the Seychelles warbler (Acrocephalus sechellensis)

Journal of Ornithology volume 146, pages 305–313 (2005)Cite this article

Abstract

Despite the absence of pronounced changes in day length, there is considerable climatological seasonality in the tropics. Its expression can be complex like in the monsoon climate of the Indian Ocean Islands. The land mass distribution on both sides of the equator leads to seasonal changes in prevailing wind direction and seasonal patterns in food supply, which are distinct between different coasts. Here we assess that territory quality of the Seychelles warbler, endemic to the small island of Cousin peaks during the South East monsoon (April to September) in most of the island. The Southeastern wind-exposed side is exceptional by being generally poor and having slightly increased food supply in the opposite season (NW monsoon; October to March). In response, the warblers in most territories breed primarily during the SE season, while on the SE shores they tend to breed in both seasons. The result is a semi-annual periodicity in breeding. Individual pairs can breed in 6 months intervals. In the poorer territories on the SE shore most of them indeed do this, while in the richer central habitats most pairs restrict themselves to the best (SE) season. The frequency of breeding thereby increases with territory quality in the SE season, and decreases with quality in the NW season. Withholding from breeding in the NW season despite the high food supply may have long-term advantages for the birds occupying the richer habitat. Such flexible adjustment of seasonality to local circumstances requires not only an immediate response mechanism but also access to accurate information about time of year. The subtle sensitivity of tropical songbirds to photoperiod, demonstrated so convincingly by Eberhard Gwinner (Biological rhythms, Hokkaido University Press, Sapporo, pp19–40, 2005), may well have profound adaptive meaning in taking temporally optimized reproductive decisions in response to both food and time of year.

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Notes

  1. Territory quality index: tq a Σ (c x i x)/100, with a=mean territory size (to the nearest 0.01ha), c x is mean foliage cover for plant species x,i x is mean monthly insect totals for plant species x per unit leaf area (10×10cm), integrated over 12 plant species (see Komdeur 1992).)

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Acknowledgements

This work would not have been possible without the support of BirdLife International and Nature Seychelles, who kindly permitted the fieldwork and provided accommodation and facilities on Cousin Island. We thank Roelof Hut for providing the harmonic regression tool for the analysis of semi-annual periodicity. BirdLife International, the Netherlands Foundation for the Advancement of Tropical Research (NWO—WOTRO projects 84-368 and 82-289) and the Netherlands Organisation for Scientific Research (NWO—VICI project 865.03.003) have consistently supported the research on the Seychelles warbler, for which we are very grateful.

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Authors and Affiliations

  1. Animal Ecology Group, Centre for Ecological and Evolutionary Studies, University of Groningen, PO Box 14, 9750, AA Haren, The Netherlands

    Jan Komdeur

  2. Behavioural Biology and Chronobiology, University of Groningen, PO Box 14, 9750, AA Haren, The Netherlands

    Serge Daan

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  1. Jan Komdeur
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  2. Serge Daan
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Correspondence to Jan Komdeur.

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Communicated by F. Bairlein

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Komdeur, J., Daan, S. Breeding in the monsoon: semi-annual reproduction in the Seychelles warbler (Acrocephalus sechellensis). J Ornithol 146, 305–313 (2005). https://doi.org/10.1007/s10336-005-0008-6

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  • DOI: https://doi.org/10.1007/s10336-005-0008-6

Keywords

  • Neotropical birds
  • Seasonal breeding
  • Trophical photoperiod
  • Avian reproduction
  • Seychelles warbler