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Biological Sciences Profiles

Matthew Koski

Assistant Professor
Biological Sciences Department

Office: 134 Long Hall
Phone: 864-656-3163
Personal Website:


 Educational Background

Ph.D Ecology & Evolution
University of Pittsburgh 2015

B.S. Environmental Science
University of Michigan 2009

 Courses Taught

BIOL 3350 Evolutionary Biology
BIOL 8000 Concepts in Evolution, Ecology and Organismal Biology (Microevolution section)


Vice-Chair; Plant Population Ecology Section, Ecological Society of America

 Research Interests

I study the ecological and evolutionary processes that generate diversity in flowering plants. I'm particularly interested in floral adaptation to changing abiotic and biotic conditions across both space and time. To this end, I study adaptation across large-scale latitudinal and altitudinal gradients, and evaluate phenotypic responses to global change using retrospective herbarium-based approaches. I address questions primarily focused on floral pigmentation and plant mating systems, spanning levels of biological organization from populations to large clades.


Koski, M. H., Galloway, L.F. 2020. Geographic variation in floral color and reflectance correlates with temperature and colonization history. Frontiers in Plant Science.

Koski, M. H. 2020. Macroevolution of floral color patterning: biased transition rates and correlations with flower size. Frontiers in Plant Science. In press.

Koski, M. H. 2020. The role of sensory drive in floral evolution. New Phytologist. In press.

Koski, M. H., Berardi, A., and L. F. Galloway. 2020. Pollen color morphs take different paths to fitness. Journal of Evolutionary Biology. In press.

Koski, M. H., Layman, N. C., Prior, C. J., Busch, J. W., and L. F. Galloway. 2019. Selfing ability and drift load evolve with range expansion. Evolution Letters 3: 500-512.

Koski, M. H., Galloway, L. F., and J. W. Busch. 2019. Pollen Limitation and selfing ability interact to shape variation in outcrossing rate across a species range. American Journal of Botany 106: 1240-1247.

van der Kooi, C. J., Kevan, P. G., and M. H. Koski. 2019. The thermal ecology of flowers. Annals of Botany 124: 343-353.

Ison, J. L., E. S. L. Tuan, M. H. Koski, J. S. Whalen, and L. F. Galloway. 2018. The role of pollinator preference in the maintenance of pollen color variation. Annals of Botany 123 :951-960.

Koski, M. H., J. L. Ison, A. Padilla, A. Pham, and L. F. Galloway. 2018. Linking pollinator effectiveness to patterns of pollen limitation: small bees exploit the plant-pollinator mutualism. Proceedings of the Royal Society B 285: 20180635.

Leibman, L., A. Rowe, M. H. Koski, and L. F. Galloway. 2018. Populations with greater flexibility in floral traits modify mating system in response to the pollination environment. Functional Ecology 32: 1457-1466.

Brittingham, H. A., M. H. Koski, and T.-L. Ashman. 2018. Higher ploidy is associated with reduced range breadth in the Potentilleae tribe. American Journal of Botany 105: 700-710

Koski, M. H., L. Kuo, K. Niedermaier, and L. F. Galloway. 2018. Timing is everything: dichogamy and pollen germinability underlie variation in autonomous selfing among populations. American Journal of Botany 105: 241-248.

Koski, M. H., and L. F. Galloway. 2018. Geographic variation in pollen color is associated with temperature stress. New Phytologist 218: 370-379.

Koski, M. H.*, D. Grossenbacher*, J. Busch, and L. F. Galloway. 2017. A geographic cline in the ability to self-fertilize is unassociated with the pollination environment. Ecology 98: 2930-2939.

Koski, M. H. and T.-L. Ashman. 2016. Reproductive character displacement and environmental filtering shape floral variation between sympatric sister taxa. Evolution 70: 2616-2622.

Koski, M. H., and T.-L. Ashman. 2016. Macroevolutionary patterns of ultraviolet floral pigmentation explained by geography and associated abiotic factors. New Phytologist 211: 708-718.

Ashman, T.-L., J. Tennessen, R. Dalton, R. Govindarajulu, M. H. Koski, and A. Liston. 2015. Multilocus sex determination revealed in two populations of gynodioecious wild strawberry, Fragaria vesca subsp. bracteata. G3 Genes, Genome, Genetics 5: 2759-2773.

Koski, M. H., and T.-L. Ashman. 2015. An altitudinal cline in UV floral pattern corresponds with a behavioral change of a generalist pollinator assemblage. Ecology 12: 3343-3353.

Koski, M. H., and T.-L. Ashman. 2015. Patterns of floral pigmentation provide example of Gloger's rule in plants. Nature Plants 1.1.

Koski, M. H.*, G. A. Meindl*, G. Arceo-Gomez, M. Wolowski, K.A. Lecroy, T.-L. Ashman. 2015 Plant-flower visitor networks in a serpentine metacommunity: Assessing traits associated with keystone plant species. Arthropod-Plant Interactions 9: 9-21.

Koski, M. H., and T.-L. Ashman. 2014. Dissecting pollinator responses to a ubiquitous ultraviolet floral pattern in the wild. Functional Ecology 28: 868-877.

Koski, M. H., and T.-L. Ashman 2013. Quantitative variation, heritability, and trait correlations for ultraviolet floral traits in Argentina anserina (Rosaceae): Implications for floral evolution. International Journal of Plant Sciences 174: 1109-1120.

Dalton, R., M. H. Koski, and Ashman, T-L. 2013. Maternal sex effects and Inbreeding depression under varied environmental conditions in gynodioecious Fragaria vesca subsp. bracteata. Annals of Botany 112: 613-621.

Li, J., M. H. Koski, and T.-L. Ashman. 2012. Functional characterization of gynodioecy in Fragaria vesca ssp. bracteata. Annals of Botany 109: 545-552.