Lake Erie Wetlands Wildlife
Wildlife Preservation Canada first became involved in this region in 2004, when we supported research into the nesting success of at-risk turtles at two sites on Lake Erie. This study revealed that virtually 100 per cent of the eggs at these sites were being destroyed before they could hatch. The culprit? Natural predators such as raccoons and skunks, whose populations have exploded in recent decades thanks to food and shelter they find at campsites and cottages.
In response, researcher Ryan Bolton evaluated a variety of methods to protect turtle nests, including caging individual nests, relocating them to large predator-proof enclosures and artificially incubating them in a lab setting.
When Ryan’s project ended in 2011, we supported research and recovery efforts led by former Canada’s New Noah Dr. Christina Davy through 2017. To protect turtle nests from over-predation, Dr. Davy and her team use artificial incubation, which ensures the highest possible rate of hatchling production.
To measure the success of these efforts, they permanently mark all hatchlings before releasing them back into the wild, and continue to monitor the populations through trapping and nesting surveys. This is a long-term endeavour, as some turtle species take up to twenty years to reach sexual maturity.
In addition to the ongoing turtle nest protection program, Dr. Davy has examined the conservation genetics of spotted, snapping and softshell turtles in Ontario, creating insights that will help us better manage and recover these species.
From 2013-17, the project team also tracked eastern foxsnakes using radio telemetry to learn more about how they use habitat and select hibernation sites within a human-modified environment. The team also investigated the distribution of snake fungal disease, an emerging threat to snake populations in north-eastern North America. In 2015 Dr. Davy began identifying critical breeding habitat for the Fowler’s toad and assessing the impacts of erosion and invasive phragmites reeds in these sensitive areas.
Going forward, we are evaluating the need for hands-on intervention to help these species at other sites in the region, and assessing the feasibility of taking action to help other species such as the small-mouthed salamander and the extirpated Blanchard’s cricket frog.
As of fall 2017, our intervention had resulted in over 13,000 Blanding’s, spiny softshell, northern map, and snapping turtle hatchlings being saved and released into Lake Erie, while scientists working in the program have added to the overall body of conservation knowledge by routinely publishing research papers. Ryan Bolton’s study showed that each nest protection method he tested has its strengths and weaknesses, but all have a positive impact. While artificial incubation is the most costly method, it ensures the highest possible survival rate. Meanwhile, Dr. Davy has developed new genetic markers for snapping and softshell turtles, which have helped define the population structure and important management units for these species in Ontario.
The eastern foxsnake radio-tracking study allowed us to observe previously undocumented diving and mud-bathing behaviour, and to track shifting hotspots in road mortality. Our study population is affected by snake fungal disease (SFD), thus providing an opportunity to add to our understanding of the true impacts of this disease on a wild population.
Our nest protection effort addressed the single biggest threat to turtles along the shores of Lake Erie: nest predation. By ensuring that new generations of turtles hatch, we’ve helped secure a future for these species.
Although it will be many years before our rescued hatchlings reach breeding age, population monitoring has already shown that they can survive in the wild. Survey efforts have also increased surveillance in the area, protecting the spotted turtle population from one of its greatest risks: poaching for the pet trade.
At the same time, Dr. Davy’s molecular markers now allow law enforcement to identify the origin of illegally poached and traded turtles, contributing to efforts to combat these illegal activities. Her insights into the landscape-scale genetic structure of several turtle species have helped to prioritize areas for applied conservation approaches that increase connectivity, such as wildlife corridors and translocations.
Catrysse, J., E. Slavik, A. Leifso, J. Choquette and C.M. Davy. 2015. Mass mortality of mature female Northern Map Turtles (Graptemys geographica). Canadian Field Naturalist 129(1): 80-83.
Oddie, M., S.C. Coombes & C.M. Davy. 2015. Investigation of cues used by predators to detect snapping turtle (Chelydra serpentina) nests. Canadian Journal of Zoology 93(4): 299-304.
Davy, C.M., J.E. Paterson & A.E. Leifso. 2014. When righting is wrong: performance measures require rank repeatability for estimates of individual fitness. Animal Behaviour, 93C: 15-23.
Davy, C.M. & R.W. Murphy. 2014. Conservation genetics of the endangered spotted turtle (Clemmys guttata) illustrates the risks of “bottleneck tests”. Canadian Journal of Zoology, 92(2): 149–162.
Davy, C.M. 2013. Conservation genetics of Ontario freshwater turtles. (Ph.D. Thesis) Toronto: University of Toronto, 163 pp.
Davy, C.M., P.H. Bernardo & R.W. Murphy. 2013. A Bayesian approach to conservation genetics of Blanding’s turtle (Emys blandingii) in Ontario, Canada. Conservation Genetics. DOI: 10.1007/s10592-013-0540-5.
Davy, C.M., D.M.R. Storisteanu, I.M. Conflitti & R.W. Murphy. 2012. Isolation and characterization of eleven novel polymorphic microsatellite loci in the spiny softshell turtle (Apalone spinifera). Conservation Genetics Resources. DOI: 10.1007/s12686-012-9638-1.
Davy, C.M., A.E. Leifso, I.M. Conflitti & R.W. Murphy. 2012. Characterization of 10 novel microsatellite loci and cross-amplification of two loci in the snapping turtle (Chelydra serpentina). Conservation Genetics Resources. DOI: 10.1007/s12686-012-9624-7.
Bolton, R.M. 2007. Effects of anthropogenic disturbance, nest-site selection, and Dipteran infestation on spiny softshells (Apalone spinifera). (M.Sc. Thesis) Guelph: University of Guelph, 103 pp.
After completing his graduate research, Ryan Bolton went on to pursue a career in wildlife photography and videography. He founded The Art of Conservation, an organization that produces and donates wildlife imagery to conservation groups worldwide.
Dr. Christina Davy began her research on Lake Erie turtles in 2008. A graduate of our Canada’s New Noah training program, Christina focuses on applied species conservation and the use of conservation genetics and in situ threat mitigation in species recovery. She has a particular interest in the importance of wildlife disease in biodiversity conservation.
Dr. Davy’s PhD thesis at the University of Toronto investigated the conservation genetics of turtles in Ontario and the genetic effects of population fragmentation on threatened and endangered turtle species. In 2013, Dr. Davy was awarded the prestigious Liber Ero fellowship, supporting her exploration of gene flow and disease susceptibility of Canadian Bats.
Dr. Davy is now a Wildlife Research Scientist for Species at Risk with the Ontario Ministry of Natural Resources and Forestry.
- The K. M. Hunter Charitable Foundation