My research focuses on the evolutionary history of small mammals in the Old World, and in particular, the island archipelagos of Southeast Asia. In general, I combine biodiversity inventories with molecular and morphological systematics to understand how organisms diversify and fill the environment. I am especially interested in the effects of ecological opportunity, time of colonization, and incumbency on the tempo and mode of speciation in island-dwelling lineages. Additional details are provided on my lab web-site.
Esselstyn JA, AS Achmadi & KC Rowe. 2012. Evolutionary novelty in a rat with no molars. Biology Letters. DOI: 10.1098.rsbl.2012.0574.
Esselstyn JA, BJ Evans, JL Sedlock, FAA Khan & LR Heaney. 2012. Single-locus species de- limitation: A test of the mixed Yule-coalescent model, with an empirical application to Philippine round-leaf bats. Proceedings of the Royal Society B: Biological Sciences. 279:3678–3686.
Esselstyn JA, SP Maher & RM Brown. 2011. Species interactions during diversification and community assembly in an island radiation of shrews. PLoS ONE. 6:e21885. DOI: 10.1371/journal.pone.0021885.
Esselstyn JA & CH Oliveros. 2010. Colonization of the Philippines from Taiwan: a multi-locus test of the biogeographic and phylogenetic relationships of isolated populations of shrews. Journal of Biogeography. 37:1504–1514.
Esselstyn JA, CH Oliveros, RG Moyle, AT Peterson, JA McGuire & RM Brown. 2010. Integrating phylogenetic and taxonomic evidence illuminates complex biogeographic patterns along Huxley’s modification of Wallace’s Line. Journal of Biogeography. 37:2054–2066.
Esselstyn JA & RM Brown. 2009. The role of repeated sea-level fluctuations in the generation of shrew (Soricidae: Crocidura) diversity in the Philippine Archipelago. Molecular Phylogenetics and Evolution. 53:171–181.
Esselstyn JA, RM Timm & RM Brown. 2009. Do geological or climatic processes drive speciation in dynamic archipelagos? The tempo and mode of diversification in Southeast Asian shrews. Evolution. 63:2595–2610.