Department of Zoology, Oregon State University, Corvallis, OR 97331-2914, USA. christim@science.oregonstate.edu|Department of Zoology, Oregon State University, Corvallis, OR 97331-2914, USA. christim@science.oregonstate.edu|Department of Zoology, Oregon State University, Corvallis, OR 97331-2914, USA. christim@science.oregonstate.edu