Freshwater resources are an integral component of both human and ecosystem health. Surveying the communities of these habitats provide a measure of the health of that system as well providing the raw materials for systematic studies. Surveys in various regions in both the Old and New World tropics show that hydrophilids are routinely 40 to 90% undescribed in these areas. We have described hundreds of species new to science. Our lab has been involved dozens of expeditions in Costa Rica, Venezuela, Guyana and Suriname to survey this incredibly diverse region for aquatic insects. We work with in-country institutions as well as conservation groups (WWF, Conservation International) to maximize the reach and impact of our research. In 2017, we began new survey work in the Brazilian Amazon.
Recent Examples:
We are particularly interested in constructing holistic phylogenies (integrating morphology, DNA sequence data, and fossils) to examine patterns of evolution in aquatic beetles. We employ Sanger sequencing as well as UCE (ultraconserved.org) and RADSeq methods depending on the question of interest. We are particularly interested translating our trees into stable classifications and use them to explore a range of questions related to the evolution and impact of habitat transitions, morphological change and "key" innovations, and diversification rate shifts.
Recent Examples:
Our lab has been increasingly interested in testing apparent biogeographic patterns we have encountered in our beetle groups. Because most subfamily/tribe-level lineages of Hydrophilidae diversified is the Cretaceous (Bloom et al. 2013), the breakup of Gondwana appears to have contributed to how these taxa are presently distributed. We have found lineages, for example, that are congruent with the fragmentation of both East Gondwana (Toussaint, Fikacek & Short 2016) and West Gondwana (Toussaint, Bloom & Short in press). We are also particularly interested in the role of South America as a "museum" and/or "cradle" for water beetle diversity, and the often surprisingly disparate relationships between the Andean and apparently more ancient Guiana and Brazilian Shield faunas of the continent.
Recent Examples: