current researchI am a recipient of the University of Kentucky's (UK) University Research Postdoctoral Fellowship. My highly collaborative research out of the Weisrock Lab at UK is focused on species tree reconstruction in Madagascar's lemurs. Publications pending.
I am also co-leading a project about species limits and gene flow in the North American tiger salamander species complex. This project is currently in peer review but available on bioRxiv. Dissertation researchMy PhD research with the Olson Lab in the University of Alaska Museum Mammals Collection focused on phylogeography and species delimitation in Madagascar's tenrecs. A tenrec is any species in the mammal family Tenrecidae, only found on the island-country of Madagascar -- you can learn more about them below. My four dissertation chapters have been published:
Everson, KM, SA Jansa, SM Goodman, and LE Olson. 2020. “Montane regions drive recent diversification in small mammals and reptiles from Madagascar’s humid forest.” Journal of Biogeography 47(10): 2059-2072.* doi:10.1111/jbi.13945 *Featured as the Editor’s Choice article Everson, KM, SM Goodman, and LE Olson. 2020. “Speciation and gene flow in two sympatric mammals from Madagascar, Microgale fotsifotsy and M. soricoides (Mammalia: Tenrecidae).” Molecular Ecology 29(9): 1717-1729. doi:10.1111/mec.15433 Everson, KM, KBP Hildebrandt, SM Goodman, and LE Olson. 2018. “Caught in the act: incipient speciation across a latitudinal gradient in a semifossorial mammal from Madagascar, the mole tenrec Oryzorictes hova (Tenrecidae).” Molecular Phylogenetics and Evolution 126:74-84. doi:10.1016/j.ympev.2018.02.024 Everson, KM, V Soarimalala, SM Goodman, and LE Olson. 2016. “Multiple loci and complete taxonomic sampling resolve the phylogeny and biogeographic history of tenrecs (Mammalia: Tenrecidae) and reveal higher speciation rates in Madagascar’s humid forests.” Systematic Biology 65(5): 890-909.* doi:10.1093/sysbio/syw034 *featured on cover; received Publisher’s Award for Excellence in Systematic Research During my PhD I was also first-author of a study out of Dr. Kevin Winker's lab about speciation and gene flow in a lineage of birds containing both migratory and non-migratory species: Everson, KM, McLaughlin, JF, Cato, IA, Evans, MM, Gastaldi, AR, Mills, KK, Shink, KG, Wilbur, SM, and Winker, K. 2019. “Speciation, gene flow, and seasonal migration in Catharus thrushes." Molecular Phylogenetics and Evolution 139:106564. doi:10.1016/j.ympev.2019.106564 |
GLOSSARY
Phylogeography is a subset of evolutionary biology. It is the study of the geographic distributions of organisms and how this relates to phylogenetic patterns. This field is helpful in understanding the processes that drive speciation and diversification of living things. Species delimitation is the discovery or delineation of new species, often by studying the genetics and biogeography of existing, recognized species. It is critical for a host of biological inquiry, as species are the fundamental units of ecology, systematics, and conservation biology. Are you a student applying for the NSF Graduate Research Fellowship this year? Here are my successful 2014 materials:
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Why study evolution in Madagascar?
Madagascar is a natural model system for studying evolution and diversification. It is located about 400 km off Africa's southeastern coast, and is sometimes called the "8th continent" due to its long history of isolation and its unique biota. Madagascar is a top biodiversity hotspot with remarkable levels of both species richness and endemism, including 100% endemism of its 105 terrestrial mammal species (Goodman & Bernstead, 2005). Despite its apparent proximity to Africa, only four lineages of mammals were able to colonize the island: tenrecs, carnivorans, lemurs, and nesomyine rodents. Evidence suggests that each of these native groups radiated from a single common ancestor between 18-65 MYA (Poux et al., 2008). Scientists are not yet sure what cause the in situ diversification of Madagascar’s biota, but they have several hypotheses related to climate (Pearson & Raxworthy, 2009), rivers (Wilmé et al., 2006), and mountains (Wollenberg et al., 2008).
Only includes native species. SM Goodman & JP Benstead. 2005. Oryx 39:73.
What is a tenrec?
Photo credits: Steve Zak, Steven Goodman, Link Olson
Tenrecs are small- to medium-sized placental mammals in the family Tenrecidae. Today 32 living species are recognized, all of which are endemic to the island continent of Madagascar. All tenrecs are believed to have evolved from a single species that colonized the island from Africa between 35 and 50 million years ago. Since then, tenrecs have undergone an incredible radiation and now exhibit enormous ecological and phenotypic diversity. They include semiaquatic, semifossorial, and scansorial ecomorphologies; heterothermic as well as homeothermic physiologies; short, velvety pelage to stout, barbed, detachable spines; and body sizes spanning three orders of magnitude (2-2000 grams; Goodman, 2003). The tenrecs have also undergone spectacular convergent evolution with moles, shrews, otters, and hedgehogs, as reflected by their common names (e.g. mole tenrec, shrew tenrec, etc.), but are in fact more closely related to elephants and aardvarks than their namesakes.
Tenrecidae includes three subfamilies (Geogalinae, Tenrecinae, Oryzorictinae), 8 extant genera (Geogale, Limnogale, Tenrec, Echinops, Setifer, Hemicentetes, Oryzorictes, Microgale), and 32 recognized living species.
Tenrecidae includes three subfamilies (Geogalinae, Tenrecinae, Oryzorictinae), 8 extant genera (Geogale, Limnogale, Tenrec, Echinops, Setifer, Hemicentetes, Oryzorictes, Microgale), and 32 recognized living species.
Photo credits: Dr. Link Olson & Dr. Steven Goodman
Other research experiences
photo credit: Dr. Carol Landry
My senior honors thesis as an undergraduate was a study of the evolution and geographical distribution of the Woolly Mouse Opossum (Marmosa demerarae), a small South American marsupial. Working at the University of São Paulo (USP) with Dr. Alexandre Percequillo, we showed that populations on either side of the Madeira River in the Amazon rainforest are morphologically and genetically distinct. I presented my research at the 2012 Denman Undergraduate Research Forum and published my complete thesis with The Ohio State University.
In 2011 I conducted an independent research project on the reproductive biology of Bay Lavender, a common dune plant on San Salvador Island in the Bahamas (advisor Carol Landry). I concluded that Bay Lavender serves as a key foraging plant for at least 12 insect species from three orders and that self-compatibility makes Bay Lavender a good pioneer species, with the ability to colonize new dunes with just one or a few individuals (especially important after a hurricane).
During my first two years at Ohio State (2009-2010) I worked as a Research Assistant in Dr. Kristin Mercer's Plant Evolutionary Ecology Lab, where I participated in studies of gene flow and hybridization between wild and domesticated sunflowers. I also worked as a Research Assistant in Dr. James Bauer's Aquatic Biogeochemistry Lab during my last two years of college (2011-2012). There I learned carbon dating and nutrient analysis methods and used them to study organic and inorganic inputs to aquatic systems. Finally, I spent my summers as an undergraduate working as an assistant at OSU's F.T. Stone Laboratory and Biological Field Station on Gibraltar Island in Lake Erie.
In 2011 I conducted an independent research project on the reproductive biology of Bay Lavender, a common dune plant on San Salvador Island in the Bahamas (advisor Carol Landry). I concluded that Bay Lavender serves as a key foraging plant for at least 12 insect species from three orders and that self-compatibility makes Bay Lavender a good pioneer species, with the ability to colonize new dunes with just one or a few individuals (especially important after a hurricane).
During my first two years at Ohio State (2009-2010) I worked as a Research Assistant in Dr. Kristin Mercer's Plant Evolutionary Ecology Lab, where I participated in studies of gene flow and hybridization between wild and domesticated sunflowers. I also worked as a Research Assistant in Dr. James Bauer's Aquatic Biogeochemistry Lab during my last two years of college (2011-2012). There I learned carbon dating and nutrient analysis methods and used them to study organic and inorganic inputs to aquatic systems. Finally, I spent my summers as an undergraduate working as an assistant at OSU's F.T. Stone Laboratory and Biological Field Station on Gibraltar Island in Lake Erie.
