Ecology & Evolutionary Biology Research

Studies from these disciplines focus on conservation, response to climate change, population genetics, physiological ecology, and the ecology and evolution of both social insects and symbiosis. Researchers use a combination of modeling, molecular ecology, genomics, and phylogenetics to address these focal areas. This work also combines manipulative and observational lab experiments with field research in sites across Costa Rica, central Africa, and the American subtropics.

Faculty Conducting Research in Ecology & Evolutionary Biology

	Faculty Member	Expertise
	Edward (Ted) Daeschler Professor; Curator and Chair of Vertebrate Zoology, Academy of Natural Sciences of Drexel University Academy of Natural Sciences of Drexel University 1900 Benjamin Franklin Parkway Philadelphia, PA 19103 ebd29@drexel.edu	Vertebrate Paleontology History of the Earth Late Devonian fossil vertebrates Origin of tetrapods Fossil collecting Museum curation
	Jon Gelhaus Curator and Department Chair, Entomology Department, Academy of Natural Sciences Department of Entomology, Academy of Natural Sciences of Drexel University jkg78@drexel.edu	Taxonomy Systematics Entomology Biodiversity Water Quality Museum Collections
	Danielle Kreeger Research Associate Professor, Department of Biodiversity, Earth & Environmental Science PISB 315 dak29@drexel.edu
	Tatyana Livshultz Associate Professor, Department of Biodiversity, Earth & Environmental Science Assistant Curator of Botany, ANS ANS tl534@drexel.edu	The ca. 250,000 species of flowering plants around us display a vast diversity of floral forms. The fundamental questions I’m interested in are how differences in floral form produce different floral functions and how natural selection acts on floral function to produce the diversity of floral forms that we see. My focus is on the Apocynaceae, the milkweed and dogbane family, a group of ca. 5000 species of flowering plants. Milkweeds (ca. 3000 of the 5000 Apocynaceae species) have evolved some of the most remarkable countermeasures to the unreliability of animal pollinators. The average pollen transfer efficiency (percentage of removed pollen grains deposited on conspecific stigmas) of milkweeds is greater than 10 percent while more typical animal-pollinated flowers with pollen dispersed in monads have an average pollen transfer efficiency of less than 1 percent). This extra-ordinary function is produced by some of the most structurally complex flowers in the world, comparable only to those of orchids. I’m using a diversity of approaches including pollination biology, evolutionary tree reconstruction, biogeography, climate niche analysis, and comparative development to understand where, when, how and why milkweeds got so efficient. I’m also studying the evolution and species diversity of the genus Dischidia, a group of about 80 species from Southeast Asia that have evolved a symbiotic relationship with ants including some remarkable chemical and morphological modifications that function in this relationship. Species of Dischidia have ant-attractive seeds, inducing the ants to collect them, and some also modified leaves that function as ant houses. As curator of the PH herbarium, one of my priorities is to develop databases that allow researchers to easily access information from herbarium specimens to track changes in plant distributions, flowering times and associations. These data are fundamental to helping us understand the unprecedented global change that we are experiencing today. As one of the oldest herbaria in North America, with specimens dating to the 18th century, the Academy’s collection represents a uniquely long record of plants over time. The information contained in these specimens is currently difficult to use since it is distributed among a million plus individual samples. Assembling this information into a database where it can be easily accessed and queried will help reveal how our environment has been changing over the past 300 years.
	John G. Lundberg Professor Emeritus, Department of Biodiversity, Earth & Environmental Science; Curator Emeritus, ANS jgl43@drexel.edu	Most of my research concerns the diversity and diversification of fishes. I seek to document and interpret the character (morphological and molecular) and taxonomic diversity of living and fossil fishes in the interrelated fields of systematics, faunistics and biogeography, and paleobiology. My work has a significant field component with exploration and collecting in poorly-known tropical freshwater habitats and regions.
	Richard M. McCourt Professor; Curator of Botany, Director of the Center for Systematic Biology and Evolution, Academy of Natural Sciences of Drexel University Academy of Natural Sciences of Drexel, Botany Department rmm45@drexel.edu	Molecular systematics Algae Evolution Taxonomy Algal ecology
	Michael O'Connor Professor; Chair, Institutional Animal Care and Use Committee PISB 318 oconnomp@drexel.edu	Thermal, hydric, & energetic effects on the activity and distribution of reptiles and amphibians Physical constraints on heat and mass exchange by reptiles and amphbians Physiological and physical constraints on gas exchange in sea turtle nests - effects on metabolism and development
	Sean O'Donnell Professor PISB 324 so356@drexel.edu	Brain plasticity and the evolution of brain structure Social behavior and division of labor, especially of eusocial Hymenoptera Thermal ecology and thermal physiology Network models of social group organization Behavior and ecology of bird-army ant interactions Human-safe insecticides
	Daniel Otte Professor Emeritus, Department of Biodiversity, Earth & Environmental Science; Senior Curator Emeritus, ANS Entomology, ANS do332@drexel.edu	I am a taxon scientist who specializes on the the taxonomy and biogeography of Orthoptera (grasshoppers, crickets, katydids and their relatives), but I concentrate mainly on grasshoppers (Acridoidea) and crickets (Grylloidea). My principal interest, besides discovering new taxa, is in studying the origin of species. Over my career I have worked mainly on large faunal treatments of crickets (crickets of Australia, Hawaii, the Caribbean, Fiji, and New Caledonia) and grasshoppers (North America and southern Africa). I have discovered and named approximately 1600 species and have discovered nearly 25% of the World’s 5000+ cricket species. My main emphasis has been in studying the earliest stages of speciation. In crickets I use mainly the songs for initial recognition of species. This allowed me to discover large numbers of species that could not be distinguished by morphology alone. I spent approximately 15 years assembling major online catalogs to the world’s species of Orthoptera, Mantodea, Phasmida and Blattodea. All told, the catalogs cover about 45,000 species. The databases are almost unique in biology in scope; they cover all known species and have begun to accumulate everything known about the world’s species (images, distribution, habitat, ecology, life cycles, etc). The Orthoptera Species File is now financially endowed and will be supported in perpetuity. No other taxonomic databases are as comprehensive. I am currently attempting to complete two faunal treatments of grasshoppers: an all-species taxonomic treatment of North American grasshoppers, covering the entire continent (plus the Caribbean basin), plus an all-species treatment of the grasshoppers of Southern Africa (from the Zambezi southwards). Each volume will contain approximately 1000 species (of these about 20% of the species are expected to be new to science). I spend much of my time working in museums that have good holdings of North American and southern African grasshoppers (Berlin, London, Madrid, Paris, University of Michigan, California Academy of Sciences, and the National Insect Collection in Pretoria).
	Marina Potapova Associate Professor, Department of Biodiversity, Earth & Environmental Science Assistant Curator of Diatoms, ANS Diatom Herbarium, ANS mp895@drexel.edu	My research is on the taxonomy, ecology and biogeography of diatoms. I am using light and scanning electron microscopy, geometric morphometric shape analysis, molecular methods and ecological modeling techniques to study diatom communities of various geographical areas, to understand how environmental change affects their structure and function and to reveal biogeographical patterns of diatoms. Current projects include 1) diatoms of mid-Atlantic coastal wetlands as indicators of pollution, sea level and climate change; 2) environmental DNA metabarcoding of microeukaryotic assemblages in rivers and streams; 3) effects of stream restoration on diatoms, 4) biogeography of Beringian diatoms (Northeastern Siberia and Alaska).
	Gary Rosenberg Professor, Department of Biodiversity, Earth & Environmental Science; Pilsbry Chair of Malacology, ANS Malacology, ANS gr347@drexel.edu	My research centers on the magnitude and origin of species-level diversity in the Mollusca. Estimates of the total number of living mollusk species range from less than 100,000 to more than 200,000, but that the actual number known is about 75,000. I use an informatics approach to better document the known diversity of mollusks and to estimate their total diversity. I developed Malacolog, an online database of Western Atlantic marine gastropods, and am an editor for the Mollusca in the World Register of Marine Species. My field work is currently centered in the Philippines, which has the world’s highest diversity of marine mollusks, where I am a Co-PI on the Philippine Mollusk Symbiont ICBG, and in Jamaica, which has one of the most diverse faunas of terrestrial mollusks in the world, for which I have developed an interactive key.
	Jacob A. Russell Professor PISB 325 jar337@drexel.edu	Roles of bacterial symbionts in ant evolution Function, stability, and dynamics of heritable symbiont communities in aphids Genomic mechanisms driving correlations between symbiosis and insect ecology Coevolutionary histories between insects and their microbes
	Alexis Schulman Assistant Research Professor, Department of Biodiversity, Earth and Environmental Science; Director of the Environmental Studies and Sustainability Program Dolan Fellow for Innovation in Water Science, Patrick Center for Environmental Research, ANS Patrick Center 336 as5293@drexel.edu	Environmental policy and politics Urban planning Sustainability and resilience transitions Policy implementation Local knowledge and community science
	Jocelyn A. Sessa Assistant Professor; Assistant Curator, Invertebrate Paleontology Department, Academy of Natural Sciences of Drexel University Academy of Natural Sciences of Drexel University 1900 Benjamin Franklin Parkway Philadelphia, PA 19103 jsessa@drexel.edu	Ocean acidification Mollusks Climate change Paleobiology
	Loÿc Vanderkluysen Associate Professor PISB, Room 322 loyc@drexel.edu	Volcano remote sensing and monitoring Volcanic gasses Igneous petrology and geochemistry Large Igneous Provinces
	David Velinsky Professor The Academy of Natural Sciences, 2nd Floor 1900 Benjamin Franklin Parkway, Philadelphia, PA velinsky@drexel.edu	Fate and transport of chemical contaminants Stable isotope and nutrient biogeochemistry Sediment geochemistry and deposition Water quality
	Dane Ward Assistant Teaching Professor, Department of Biodiversity, Earth & Environmental Science PISB 315 dcw33@drexel.edu	Urban Ecology Conservation Biology Pine Barrens Ecology Marine Ecology STEM Diversity & Inclusion International Education International STEM Mentorship
	Jason D. Weckstein Associate Professor, Associate Curator of Ornithology, Academy of Natural Sciences of Drexel University Academy of Natural Sciences of Drexel University Ornithology Department 1900 Benjamin Franklin Parkway Philadelphia, PA 19096 jdw342@drexel.edu	Phylogenetics Host-parasite coevolution; Ornithology Systematic biology; Comparative biology Biodiversity surveys Genomics