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         Joseph A. Cook

    Professor and Curator of Mammals
    Ph.D., University of New Mexico, 1990
    Mammalian Evolution; Molecular Systematics

    Phone: +1-505-277-1358
    email: Arctos



    Our research and teaching efforts use DNA variation to investigate historical biogeography, conservation biology, and molecular evolution. Our funded research initiatives include:

    Conservation Genetics, Demography and Comparative Phylogeography of Western North America

    We are investigating molecular variation across >20 mammals of the North American West. Our investigations of mitochondrial and nuclear DNA sequence variation have revealed a complex history of population expansion and colonization from multiple glacial refugia during the Holocene. Repeated spatial and temporal patterns of lineage divergence within species reflects the common signature of climate change on structuring genetic variation and may also indicate the long-term association and persistence of communities across dynamic geologic events such as glacial advances. We are especially focused on mammals that are endemic to island archipelagos along the North Pacific Coast of Alaska (Alexander Archipelago and Aleutian Islands).

    Molecular Evolution and Speciation in South American Vertebrates

    This project stems from my doctoral dissertation on chromosomal evolution and speciation in the South American tuco-tuco (Rodentia: genus Ctenomys), the most chromosomally-variable mammalian genus known (2n = 10-70). We are collaborating with Enrique Lessa (Uruguay) to compare and contrast nuclear and mitochondrial patterns at various levels, ranging from population to interspecific comparisons. Using a phylogenetic framework based on DNA sequences, we are now exploring the evolutionary rate and rhythm of particular genes within and among species.

    Beringia Coevolution Project

    Beringia (a large Pleistocene refugium) and the Bering Land Bridge or “Crossroads of the Northern Continents” have become a third major focus of our molecular genetic work. Along with Eric Hoberg (USDA National Parasite Lab), Heikki Henttonen & colleagues (Finnish Forest Research Institute), Nikolai Dokuchaev, Anatoli Lazhutkin, & Felix Chernyavski (Russian Academy of Sciences--Magadan), Diane Goade (Department of Medicine, University of New Mexico) and others, we are examining diversification of host/parasite coevolutionary systems in Beringia. Presumably, genetic and morphologic variation has been influenced by the repeated inundation of the Bering Land Bridge and separation of the Beringian fauna from other continental faunas (e.g. high latitude endemics). Intriguing developments in coalescent theory (and application) provide opportunities to test ideas related to co-differentiation of hosts and parasites, faunal interchange among continents, and colonization dynamics. Climate change is radically shifting species distributions at high latitudes and this research is providing the historical and contemporary framework necessary to interpret the scale and impact of these changes on Alaska and Siberia’s incomparable fauna.


    Curriculum Vita

    Cook Molecular Ecology and Evolution Lab

    Research Projects