Principal Investigator

Dr. Njal Rollinson, in Algonquin Park

I am interested in a wide array of topics, including maternal effects, thermal ecology, and the evolution of life histories. I work with ectothermic vertebrates, and I use non-model systems to answer fundamental and applied questions in evolutionary ecology and conservation.

Previously, I worked with Dr. Ron Brooks (MSc. U. Guelph), Dr. Jeff Hutchings (PhD. Dalhousie U.), and Dr. Locke Rowe (PDF University of Toronto). 

Most of my current research program is based out of Algonquin Park in Ontario.

PhD Students


Jessica hails from Scotland, where she studied at the University of Stirling and the University of Glasgow. Her previous work looked at the trade-off between reproduction and survival in wild Soay sheep. Here in Toronto, she has developed an interest in understanding the effect of temperature and climate change on embryonic development in the common snapping turtle & painted turtle. An area of study made even more important because the incubation temperature of the embryo permanently determines it sex. More broadly she is interested in understanding variation in life-history strategy, and how temperature affects life-history traits including offspring sex ratio.


Hollis is interested in how organisms diversify and evolve in dynamic geographic arrangements and environments. She holds a long-time enthusiasm for herpetology, as well as Chinese culture and language. An advocate for scientific outreach, cultural exchange, and international scientific collaboration, she will continue to travel to China and collaborate with researchers there.


Patrick is interested in evolutionary ecology, herpetology, conservation, and natural history. His research is based at the Algonquin Wildlife Research Station, where he focuses on the sensitivity to environmental change in the spotted salamander and the long-term life history study of turtles. Patrick is the recipient of several awards, including Canada’s New Noah Scholarship, and he is a strong proponent of scientific research, evidence-based policy, and stewardship programming to raise public awareness for conservation. If you would like to learn more about Patrick’s amazing work you can visit his website here!

Robin Lloyd

Robin is studying the evolutionary ecology of temperature-dependent sex determination through a combination of meta-analytic and experimental approaches. In his free time, Robin enjoys BBQing and riding the Leviathan at Canada’s wonderland.

MSc Students


Claudia is interested in the intersection of behavioural ecology, evolutionary ecology, and conservation biology. With a particular enthusiasm for herptiles, her research focuses on understanding the connection between hatchling turtle social behaviour and acoustic signalling (a.k.a. vocalizations!). She is also an advocate for science communication, education, and outreach. In her free time, Claudia enjoys wildlife photography, rock climbing, and playing volleyball. 

Celina Yang

Celina is studying the patterns and driving forces of body size gradients across latitude for turtles and other herpetofauna. Her research investigates why we often see larger turtles at higher latitudes and the ecological forces that are behind this body size cline. Celina is additionally interested in teaching and science communication, and generally sharing her love of the natural world. Her passion for studying herpetology and ecology also comes through in her favourite pastimes of wildlife photography and board games.



Now: Writing papers :))

RYAN WOLFE, MSc 2020-2022

Now: Conservation Biologist with Ontario Nature


Now: Assistant Professor at Cornell, see here

KATIE ZIEBARTH, MSc 2018-2020 (co-supervised by MARIE-JOSEE FORTIN)

Now: Spatial Analyst for Toronto Police Services

MELANIE MASSEY, MSc 2016- 2018

Now: PhD Student at Dalhousie University

Melanie is a critter enthusiast, artist, and public outreach advocate. During her time in the Rollinson Lab, she studied how the thermal environment of eggs affect sex ratios and development in Snapping Turtles. Now, she is doing a Ph. D. at Dalhousie University, where she is looking at how environmental variability affects developmental physiology of the zebrafish, a model organism. In addition to staring at eggs all day, Melanie is also working on an outreach initiative in Nova Scotia for Black, Indigenous, and people of colour youth, to engage them with Ecology. You can check out Melanie’s website here!

Undergraduate Alumni & Research Topics


Malcolm Fenech – Social behaviour in adult turtles
Aisha Faruqui – EEB397 – Evolution and maintenance of TSD
Claudia Lacroix – EEB397 – Social behaviour in hatchling turtles
Dante Ravenhearst – EEB498 – Ecology and evolution of turtle barbles
Jared Connoy – EEB498 – Evolution of TSD and nesting patterns
Hayley Vlcek – REP – Nest site selection in painted turtles
Gloria Gao – REP – Abnormalities of spotted salamanders in natural ecosystems
Pallavi Pal – Trinity One Internship
Lucas Warma – Trinity One Internship


Daire Crawford – REP – Condition-dependent reproductive timing in toads
Mariel Terebiznik – REP – Phenotypic – environmental correlation of sex in turtles
Lauren Lawson – EEB498 – Incubation regimes in turtle conservation programs
Natalia Hrynko – EEB498 – Reproductive biomass of amphibians in Algonquin


Carter Rouleau – REP – Evolution of thermal reaction norms in turtles
Deborah Hawkshaw – EEB498 – Evolution of sexual weaponry in turtles
Ann Francis – REP – Nest site selection in natural vs anthropogenic sites
Christopher Reid – CGCS scholar – Climate change & early growth of turtles
Dana Berg – CGCS scholar – Climate change and phenology of turtles
Vivian Shum – NSERC USRA – Evolution of senescence in Daphnia


Jessica Santilli – EEB498 – Bergmann’s Rule in Turtles
Lucian Wang – EEB398 – Evolution of maternal effects in Daphnia