Scorpion assemblages in threatened Brazilian forests

 

Understanding the scorpion biodiversity, distribution, species composition in time and space between and within habitats is important, especially in a time were many scorpion habitats and ecosystems are threatened, both by human impact and climate changes.  

André Lira and co-workers have recently published a study on the role of environmental factors in explaining beta-diversity patterns in threatened Brazilian forests. André (personal communication) kindly explained to me what bet-diversity is: "Basically, beta diversity addresses the change in species composition between one place and another. In my article, I used two components of beta diversity, species replacement and differences in species richness, each of which gives an answer about how the composition of a given community is structured."

The main conclusion of the study is that the scorpion species composition does not vary in a consistent way between different forest types investigated. See abstract and article for more details.

Abstract:
1. A systematic understanding of the variation in species composition across time and space is urgently needed to protect threatened Brazilian forests.

2. This study has disentangled the among-site variation in beta diversity among scorpion assemblages from the Caatinga and Atlantic Forest. We calculated the relative contribution of species replacement and differences in species richness in explaining the beta diversity in each forest, correlating such metrics with environmental characteristics. Finally, we estimated the relative site-specific contribution to identify potential environmental drivers determining unique combinations of species composition.

3. The average among-site dissimilarity in scorpion assemblages was higher in the Caatinga than that in the Atlantic Forest. The differences in species composition among Caatinga sites were mainly due to the spatial replacement of species. Differences in species richness at the local scale explained most of the variation in species composition among Atlantic Forest sites.

4. Environmental variables related to topography and land use partially explained the variation in among-site dissimilarity, species replacement, differences in species richness and the ecological uniqueness in terms of species composition in the Caatinga. Environmental variables describing topography and land use were also important in explaining differences in species richness and local contributions to the beta diversity among Atlantic Forest sites. The relative site-specific contribution to beta diversity was higher in Caatinga sites located in ecotonal zones and Atlantic Forest sites situated within conservation reserves.

5. Using scorpions as biological models, we have demonstrated that the species composition does not vary in a consistent way between different forest types.

Reference:
de Araujo Lira AF, de Moura GJB, Foerster SÍA. Scorpion assemblages in threatened Brazilian forests: The role of environmental factors in explaining beta‐diversity patterns. Insect Conservation and Diversity. 2023;First published 15 November 2023. [Sunscription required for full text]

Thanks to André for sending me their article and updating my ecology knowledge.