Beginning Jan. 18, 2022, the Zoo is open Thursdays, Fridays, Saturdays and Sundays from 8 a.m. to 3 p.m. (last admittance 2:30 p.m.). Select animal buildings remain closed. Entry passes are required for all guests, including infants. All visitors ages 2 and older are required to wear a mask in all indoor spaces at the Zoo, regardless of their vaccination status. Fully vaccinated visitors do not need to wear a mask in outdoor areas.

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Katherine Mertes, Ph.D.

Postdoctoral Research Fellow
B.S., Middlebury College; M.S., Stanford University; Ph.D., Yale University

Katherine Mertes is a postdoctoral research fellow at the Smithsonian Conservation Biology Institute's Conservation Ecology Center. Her research combines remote sensing and field data on environmental conditions with occurrence and movement data to investigate how mobile individuals, populations and species perceive and respond to their environment. She is working with Jared Stabach, Melissa Songer and Peter Leimgruber on the reintroduction of the scimitar-horned oryx (Oryx dammah) to the Ouadi Rimé-Ouadi Achim Game Reserve in Chad.

Mertes’ dissertation research evaluated the spatial scales (grains) at which species respond to environmental factors. From 2011 to 2015, she conducted focal sampling surveys and deployed miniaturized GPS/UHF tags on four bird species across Kenya, and developed a comprehensive database of field-derived and remotely sensed environmental data for the region. Mertes demonstrated that each species perceived and responded to its environment at characteristic spatial scales, which can be predicted by species attributes (primarily diet and home range size). These scales of response define important parameters for research and conservation, including the optimal size and spacing of study sites, appropriate resolution of remote sensing data, and minimum effective area for management actions.
Mertes grew up right outside Washington, D.C., and received her undergraduate degree from Middlebury College in 2004. She earned a master’s degree from Stanford University in 2008, where she used multi-temporal classification of Landsat imagery to estimate forest loss and land-cover change in Southeastern Mexico from 2000 to 2008. Mertes earned her Ph.D. from Yale University in May 2017.
Recent Publications: 

Mertes, K, and W Jetz. 2018. Disentangling scale dependencies in species environmental niches and distributions. Ecography 41 (10): 1604 – 1615.

Chuven, J, J Newby, S Monfort, K Mertes, T Wacher, S Al Dhaheri, and R Pusey. 2018. Reintroduction of the scimitar–horned oryx in to the Ouadi Rime-Ouadi Achim Game Reserve, Chad. Global Reintroduction Perspectives: Case studies from around the globe, p.165.