Abstract
Habitat heterogeneity has a complex effect on ant species richness and community structure (both alpha- and beta-diversity). Savannahs and forests are thought to have distinct species assemblages, but studies comparing savannah–forest mosaics produced conflicting results, with savannah (the less complex ecosystem) poorer in species, equally rich, or richer than forest (the most complex habitat). We compared subterranean and above ground ant assemblages in savannah and forests of Lamto Reserve (Côte d’Ivoire) to examine how habitat heterogeneity and vertical stratification drive species composition and structure patterns. The Ants of the Leaf Litter (ALL) protocol and soil monolith were used to sample ants along 16 transects of 200 m in the three main habitats (gallery forest, forest islands, and savannah). In total, 138 species from 44 genera were collected. Forested habitats held assemblages that matched those found in savannah in terms of species density and richness; however, they differed in composition. Taxonomic structure varied among habitats, with Formicinae and Amblyoponinae prevailing in savannah, and Myrmicinae numerically dominant in forests. Ants were clearly vertically stratified. Subterranean assemblages had a less even distribution of occurrences among species as compared to above ground ones. The patterns observed agree with the heterogeneity-diversity theory relative to beta-diversity but not alpha-diversity, emphasizing the difficulty to generalize across continents about factors structuring ant assemblages. Our results support the need to conserve both forest and savannah to maintain biodiversity at landscape level in Côte d’Ivoire.
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Acknowledgements
This Project was conducted at Lamto Ecology Station in Côte d’Ivoire and the authors are grateful to Kouakou Firmin and Kouassi Kouassi (Apo) for their help during field work. The authors thank Brian L. Fisher and anonymous referees for their constructive comments on previous versions of the manuscript. The authors are grateful to Barry Bolton, Stephan Cover, and Gary Alpert as well as Janine Casevitz-Weulersse for their help during ant identification at Natural History Museum (London), Museum of Comparative Zoology (Cambridge), and Muséum National d’Histoire Naturelle (Paris), respectively. This work was financed by the French government (co-tutelle de thèse 2002-2004), Conservation International (Rapid Assessment Programs), and the Ernst Mayr Grant (Harvard University). Thibaut Delsinne thanks the Secretary of Higher Education, Science, Technology and Innovation (SENESCYT) of the Government of Ecuador for financial support (Prometeo Grant) during the statistical analyses and writing of this paper.
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Yeo, K., Delsinne, T., Konate, S. et al. Diversity and distribution of ant assemblages above and below ground in a West African forest–savannah mosaic (Lamto, Côte d’Ivoire). Insect. Soc. 64, 155–168 (2017). https://doi.org/10.1007/s00040-016-0527-6
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DOI: https://doi.org/10.1007/s00040-016-0527-6