Welcome to the Dark Side of Biology!

  • Field season part 1

    What begins in May and ends in July? Answer-- FIELD SEASON!

  • How is ice off changing?

    We are currently piloting outdoor experimental tanks (mesocosms) in the alpine environment near CU Boulder's Mountain Research station. It is our hope that the black colored tanks reflect less sunlight than the beige colored tanks, effectively simulating early ice melt. We have plans to seed the tanks with sediment and zooplankton and then conduct dissolved organic carbon manipulations by adding different sized packages of willow leaves into the tanks.  

  • Hazel Barnes Prize winner

    Please join us in CELEBRATING our very own fearless leader, Dr. Pieter Johnson who was awarded CU's most distinguished award a faculty member can recieve! 

  • Wynne earns Bev Sears Grant

    Nine EBIO Graduate Students were awarded funding from the Graduate School through the Beverly Sears Grants and our Wynne Moss was one of them! 

  • Does your mother matter?

    Our newly published work in Experimental Parasitology lead by Dr. Will Stutz provides a reistance and tolerance framework that compares individual versus family level host traits in California newts.  

  • We are growing!

    Please help us welcome Brendan Hobart to the Johnson Laboratory as our new graduate student!

Our research focuses on two pervasive and inter-related forms of biological change: disease emergence and species invasions. Both have important consequences not only for individuals and populations, but for entire ecological communities and ecosystem processes. Invasions and disease can also have costly economic and health repercussions for human society.  Our group strives to bring a broad perspective to these questions by combining field experiments, large-scale spatial and temporal field data, molecular tools and ecological modeling.

Disease Community Ecology


We apply approaches from community ecology to better understand and manage contemporary disease threats of humans and wildlife, which are often the product of interactions among multiple host species, coinfecting parasites, and other species

Our Troubled Waters

Hog Lake manipulation

Lakes, rivers, ponds and streams have become some of the most imperiled habitats on earth. Our group uses diverse tools ranging from genomics to ecosystem experiments to understand how freshwater systems are changing and at what cost

Complexity in Conservation


Effective management requires approaches than can measure, anticipate and ameliorate the consequences of interactive stressors, such as land use change, pollution, invasive species and climate shifts