A multiple-site similarity measure independent of richness.

Departamento de Biodiversidad y Biología Evolutiva, Museo Nacional de Ciencias Naturales-CSIC, c/José Gutiérrez Abascal 2, 28006 Madrid, Spain.
Biology letters (Impact Factor: 3.43). 12/2007; 3(6):642-5. DOI: 10.1098/rsbl.2007.0449
Source: PubMed

ABSTRACT The Diserud-Ødegaard multiple-site similarity index makes use of data on species shared by two or more sites, but produces equal similarity values in two different circumstances: species loss and true species turnover. We developed a new multiple-site similarity measure, which is independent of richness and performs better than the Diserud-Ødegaard index under conditions of equal richness between sites, because it discriminates between situations in which shared species are distributed evenly among sites or concentrated in few pairs of sites. We conducted several simulations to assess the relative performance of both the indices. The use of the new measure is recommended, enabling the simultaneous analysis of turnover and richness gradients based on two independent measures.

Download full-text


Available from: Andrés Baselga, Jul 03, 2015
1 Follower
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The biological diversity of the Earth is being rapidly depleted due to the direct and indirect consequences of human activities. Specialist or rare species are generally thought to be more extinction prone than generalist or common species. Testing this assumption however requires that the rarity and ecological specialization of the species are quantified. Many indices have been developed to classify species as generalists vs. specialists or as rare vs. common, but large data sets are needed to calculate these indices. Here, we present a list of specialization and rarity values for more than 2,800 plant species of continental France, which were computed from the large botanical and ecological dataset SOPHY. Three specialization indices were calculated using species co-occurrence data. All three indices are based on (dis)similarity among plant communities containing a focal species, quantified either as beta diversity in an additive [6] or multiplicative [15] partitioning of diversity or as the multiple site similarity of Baselga et al. [1]. Species rarity was calculated as the inverse of a species occurrence.
    03/2015; 3. DOI:10.1016/j.dib.2015.02.015
  • Source
    Communication in Statistics- Simulation and Computation 12/2014; DOI:10.1080/03610918.2013.827715 · 0.29 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Recent studies have demonstrated that dispersal limitation, which refers to the limited ability of individuals to reach distant geographic areas, is an important influence on the species that are found in primate assemblages. In this study, we investigate the relative influences of dispersal limitation and environmental filtering in 131 African primate assemblages in 9 biogeographic regions throughout sub- Saharan Africa. Specifically, we evaluate the dispersal-ecological specialization hy- pothesis, which posits that there are trade-offs between dispersal ability and ecological specialization that are influenced by climatic variation along latitudinal gradients. The hypothesis predicts that species in assemblages near the equator, where climatic conditions are more stable, will exhibit stronger dispersal limitation and greater eco- logical specialization than species within assemblages located further from the equator, where climate is more variable. In contrast, assemblages located at higher latitudes are expected to be influenced more strongly by environmental filtering than dispersal limitation. We used hierarchical cluster analysis to identify regions, conducted partial Mantel tests to evaluate the contributions of dispersal limitation and environmental filtering in each region, and evaluated predictors of those contributions with linear regression. In all regions, dispersal limitation was a stronger predictor of community similarity than was environmental filtering, yet the strength of dispersal limitation varied. Dispersal limitation was greatest at low latitudes and declined with increasing absolute latitude. Thus, primate assemblages exhibited a significant latitudinal gradient in dispersal limitation, but not in environmental filtering. These results support aspects of the dispersal-ecological specialization hypothesis and call for future mechanistic studies to address this broad-scale pattern.
    International Journal of Primatology 12/2014; 35:1088-1104. DOI:10.1007/s10764-014-9773-5 · 1.99 Impact Factor