Biodiversity & Conservation

, Volume 11, Issue 8, pp 1417–1436

Tree and shrub diversity and abundance in fragmented littoral forest of southeastern Madagascar

  • Marc W. Cadotte
  • Rakotonasolo Franck
  • Ludovic Reza
  • Jon Lovett-Doust
Article

Abstract

In the coastal littoral forest of extreme southeastern Madagascar, westudied tree diameter at breast height (DBH) ≥ 10 cm in 20, 50× 50 m plots in each of four forest fragments, andunderstorywoody vegetation (DBH < 10 cm, ≥1 m tall) in60,10 × 10 m plots in three of the fragments. Oneforestfragment was located in the highly degraded Lokaro region, and three in the nearbySainte-Luce forest. Atotal of 3476 trees, representing 169 species in 55 families, were recorded inthe50 × 50 m plots, and 10282 understory stems, representing195 species in 54 families, were found in the 10 × 10m plots. For each tree, DBH was recorded. Mean tree diameter andpatterns of tree size class distribution did not differ among the four forestfragments. However, the fragments differed significantly in both tree andunderstory stem densities, species richness and diversity values, and familyrichness values, with the Lokaro fragment having the lowest values for allmeasures. Furthermore, floristic patterns, family importance values, and communitysimilarity measures revealed that the species composition at theLokaro fragment was very different from the Sainte-Luce fragments. Anthropogenicdisturbance appears most pronounced in the isolated Lokaro forest, where bioticresources are limited to this single fragment.

Community composition Conservation hotspot Habitat fragmentation Family and genus richness Forest fragment richness Tropical forest diversity 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Marc W. Cadotte
    • 1
  • Rakotonasolo Franck
    • 2
  • Ludovic Reza
    • 2
  • Jon Lovett-Doust
    • 1
  1. 1.Department of Biological SciencesUniversity of WindsorWindsorCanada
  2. 2.Parc Botanique et Zoologique de TsimbazazaTsimbazazaMadagascar

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