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Factors influencing the distribution and abundance of endemic pigeons on São Tomé Island (Gulf of Guinea)

  • MARIANA CARVALHO (a1), JOHN E. FA (a2), FRANCISCO C. REGO (a1), RICARDO F. DE LIMA (a3), GABRIEL SANTOS (a4) and JORGE M. PALMEIRIM (a3)...
Summary
Summary

Understanding the factors that determine habitat use and abundance of exploited species is essential to develop effective conservation strategies. We studied the four forest pigeons on São Tomé Island to assess the species’ distribution and abundance patterns. We determined ecological factors likely to be associated with each species’ use of habitats and numbers, as well as the influence of hunting pressure. In total, 35 km of line transects were surveyed in the rainy season and at the start of the dry season. Pigeons differed in their use of habitats; there were also strong seasonality effects. The most abundant species was the Lemon Dove Columba simplex, the only non-hunted species. The São Tomé Green Pigeon Treron sanctithomae and Maroon Pigeon Columba thomensis were less abundant and had more restricted ranges. Both species were strongly associated with old-growth forests. In contrast, the Bronze-naped Pigeon Columba malherbii was relatively abundant and widespread; this species favours human-altered habitats such as shade forests and non-forested areas. Fruit availability measured within the different habitats was linked with the distribution and abundance of the three hunted species. Potential human predation pressure on all species was determined from hunting signs found along the surveyed transects. There was a significant negative correlation between the abundance of two of the hunted species and hunting pressure. Our results indicate the importance of adequately protecting old-growth and secondary forests as core habitats for the survival of viable populations of all pigeon species in the island. However, control of hunting is also crucial.

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*Author for correspondence; e-mail: jfa949@gmail.com
References
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G. T. Bancroft , R. Bowman and R. J Sawicki . (2000) Rainfall, fruiting phenology and the nesting season of White-Crowned Pigeons in the Upper Florida Keys. Auk 117: 416426.

D. A Bannerman . (1931) The maroon pigeon of São Thomé. Ibis 73: 652654.

J. Barlow , J. Louzada , L. Parry , M. I. M. Hernández , J. Hawes , C. A. Peres , F. Z. Vaz-de-Mello and T. A Gardner . (2010) Improving the design and management of forest strips in human-dominated tropical landscapes: a field test on Amazonian dung beetles. J. Appl. Ecol. 47: 779788.

B. M. Bolker , M. E. Brooks , C. J. Clark , S. W. Geange , J. R. Poulsen , M. H. H. Stevens and J. S. S White . (2009) Generalized linear mixed models: a practical guide for ecology and evolution. Trends Ecol. Evol. 24: 127–35.

D. Borcard , F. Gillet and P Legendre . (2011) Numerical ecology with R. New York: Springer.

S. T. Buckland , S. J. Marsden and R. E Green . (2008) Estimating bird abundance: making methods work. Bird Conserv. Internatn. 18: 91108.

M. Dallimer , T. King and R. J Atkinson . (2009) Pervasive threats within a protected area: conserving the endemic birds of São Tomé, West Africa. Anim. Conserv. 12: 209219.

R. F. De Lima , M. Dallimer , P. W. Atkinson and J Barlow . (2012) Biodiversity and land-use change: understanding the complex responses of an endemic-rich bird assemblage. Divers. Distrib. 19: 411422.

S. J. DeWalt , S. K. Maliakal and J. S Denslow . (2003) Changes in vegetation structure and composition along a tropical forest chronosequence: implications for wildlife. For. Ecol. Manage. 182: 139151.

L. A. Hart , G. R. H. Grieve and C. T Downs . (2013) Fruiting phenology and implications of fruit availability in the fragmented Ngele Forest Complex, KwaZulu-Natal, South Africa. South African J. Bot. 88: 296305.

F. R Lambert . (1989) Pigeons as seed predators and dispersers of figs in a Malaysian lowland forest. Ibis 131: 521527.

D. J Levey . (1988) Spatial and temporal variation in Costa Rican fruit and fruit-eating bird abundance. Ecol. Monogr. 58: 251269.

P. R Minchin . (1987) An evaluation of the relative robustness of techniques for ecological ordination. Vegetation 69: 89107.

P. Oliveira , D. Menezes , M. Jones and M Nogales . (2006) The influence of fruit abundance on the use of forest and cultivated field habitats by the endemic Madeira laurel pigeon Columba trocaz: Implications for conservation. Biol. Conserv. 130: 538548.

I. P. Owens and P. M Bennett . (2000) Ecological basis of extinction risk in birds: habitat loss versus human persecution and introduced predators. Proc. Natl. Acad. Sci. U.S.A. 97: 1214412148.

N. B. Peet and P. W Atkinson . (1994) The biodiversity and conservation of the birds of São Tomé and Principe. Biodivers. Conserv. 3: 851867.

D. W Snow . (1950) The birds of São Tomé and Príncipe in the Gulf of Guinea. Ibis 92: 579595.

A. M. Strong and M. D Johnson . (2001) Exploitation of a seasonal resource by nonbreeding plain and white-crowned pigeons: implications for conservation of tropical dry forests. Wilson Bull. 113: 7377.

J. S Walker . (2007a) Geographical patterns of threat among pigeons and doves (Columbidae). Oryx 41: 289299.

J. S Walker . (2007b) Dietary specialization and fruit availability among frugivorous birds on Sulawesi. Ibis 149: 345356.

A. F. Zuur , E. N. Ieno , N. Walker , A. A. Saveliev and G. M Smith . (2009) Mixed effects models and extensions in ecology with R. New York: Springer.

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Bird Conservation International
  • ISSN: 0959-2709
  • EISSN: 1474-0001
  • URL: /core/journals/bird-conservation-international
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