Marc-André Lachance, PhD
Yeast Ecology and Evolution
Lachance studies the evolution, biogeography, biodiversity, and systematics of ascomycetous yeasts. The objectives are to document yeast biodiversity in natural habitats at the interface of insects and plants, the process of species formation in nature, and the underlying causes of the global distribution of yeasts. The habitats include floricolous insects, particularly Coleoptera, leaf-eating caterpillars, and tree exudates and the various invertebrates that inhabit them.
One current focus of our laboratory is a group of large-spored Metschnikowia species associated with nitidulid beetles that visit flowers of Convolvulacae and other plants that produce short-lived flowers. The biogeography of these yeasts, their mechanisms of reproductive isolation, and the reconstruction of speciation events are being examined in populations whose distribution ranges across the New World and the Australian-Pacific region. Another focus is the biodiversity of ascomycetous yeasts in the Neotropics. We make extensive use of polymorphic DNA loci to study the genetic structure of yeast populations.
A recent area of interest is the nature of the interaction between yeasts, nematodes, and insects.
Degrees and Institutions
- 1969 - B.A. Liberal Arts, Université de Montréal
- 1972 - B.Sc. Biology, spec. Microbiology, Université de Montréal
- 1973 - M.Sc. Microbiology, Macdonald College of McGill University, Montréal
- 1977 - Ph.D. Microbiology, University of California, Davis
- Lachance MA & Kurtzman CP 2013 The yeast genus Tortispora gen. nov., description of Tortispora ganteri sp. nov., Tortispora mauiana f.a., sp. nov., Tortispora agaves f.a., sp. nov., Tortispora sangerardonensis f.a., sp. nov., Tortispora cuajiniquilana f.a., sp. nov., Tortispora starmeri f.a., sp. nov., and Tortispora phaffii f.a., sp. nov., reassignment of Candida caseinolytica to Tortispora caseinolytica f.a., comb. nov., emendation of Botryozyma, and assignment of Botryozyma, Tortispora gen. nov., and Trigonopsis to the family Trigonopsidaceae fam. nov. Int J Syst Evol Microbiol 63:3104–3114.
- Guzmán B, Lachance MA, Herrera CM 2013 Phylogenetic analysis of the angiosperm-floricolous insect-yeast association: have yeast and angiosperm lineages co-diversified? Mol Phylogen Evol 68:161-175.
- Lachance MA, Perri A, Farahbakhsh A & Starmer WT 2013 Genetic structure of Kurtzmaniella cleridarum, a cactus flower beetle yeast of the Sonoran and Mojave Deserts: speciation by distance? FEMS Yeast Research 13:674-681.
- Lachance MA, Fedor AN 2014 Catching speciation in the act: Metschnikowia bowlesiae sp. nov., a yeast species found in nitidulid beetles of Hawaii and Belize. Antonie van Leeuwenhoek 105:541-550.
- de Vega C, Guzmán B, Steenhuisen SL, Johnson SD, Herrera CM, Lachance MA 2014 Metschnikowia drakensbergensis sp. nov. and Metschnikowia caudata sp. nov., two endemic yeasts associated with Protea flowers in South Africa. Int J Syst Evol Microbiol 64(Pt 11):3724-3732.