Gray ratsnake (Elaphe spiloides) COSEWIC assessment and status report: chapter 15

Information Sources

Andrews, K.M., and J.W. Gibbons. 2005. How do highways influence snake movement? Behavioral responses to roads and vehicles. Copeia 2005:772-782.

Ashley E.P., and J.T. Robinson. 1996. Road mortality of amphibians, reptiles and other wildlife on the long point causeway, Lake Erie, Ontario. Canadian Field Naturalist 110:403-412.

Baird, S.F., and C. Girard. 1853. Catalogue of North American reptiles in the museum of the Smithsonian Institution: part 1: Serpents. Smithsonian Miscellaneous Collection 2:1-172.

Beschel, R.E., P.J. Webber, and R. Tippett. 1962. Woodland transects of the Frontenac Axis region, Ontario. Ecology 43:386-396.

Bjorgan, L. 2005. Habitat use and movement patterns of juvenile black ratsnakes (Elaphe obsoleta) and their conservation implications. M.Sc. Thesis, University of Ottawa, Ottawa, Ontario, Canada. 66 pp.

Blouin-Demers, G., and P.J. Weatherhead. 2000. A novel association between a beetle and a snake: Parasitism of Elaphe obsoleta by Nicrophorus pustulatus. Ecoscience 7:395-397.

Blouin-Demers, G., K.A. Prior, and P.J. Weatherhead. 2000. Patterns of variation in spring emergence by black rat snakes (Elaphe obsoleta obsoleta). Canadian Journal of Zoology 80:1162-1172.

Blouin-Demers, G., and P.J. Weatherhead. 2001a. Habitat use by black rat snakes (Elaphe obsoleta obsoleta) in fragmented forests. Ecology 82:2882-2896.

Blouin-Demers, G., and P.J. Weatherhead. 2001b. Thermal ecology of black rat snakes (Elaphe obsoleta) in a thermally challenging environment. Ecology 82:3025-3043.

Blouin-Demers, G., and P.J. Weatherhead. 2001c. An experimental test of the link between foraging, habitat selection and thermoregulation in black rat snakes (Elaphe obsoleta obsoleta). Journal of Animal Ecology 70:1006-1013.

Blouin-Demers, G., K.A. Prior, and P.J. Weatherhead. 2002. Comparative demography of black rat snakes (Elaphe obsoleta) in Ontario and Maryland. Journal of Zoology 256:1-10.

Blouin-Demers, G., and P.J. Weatherhead. 2002a. Implications of movement patterns for gene flow in black rat snakes (Elaphe obsoleta). Herpetologica 56:175-188.

Blouin-Demers, G., and P.J. Weatherhead. 2002b. Habitat-specific behavioural thermoregulation by black rat snakes (Elaphe obsoleta obsoleta). Oikos 97:59-68.

Blouin-Demers, G., P.J. Weatherhead, and H.A. McCracken. 2003. A test of the thermal coadaptation hypothesis with black rat snakes (Elaphe obsoleta) and northern water snakes (Nerodia sipedon). Journal of Thermal Biology 28:331-340.

Blouin-Demers, G., P.J. Weatherhead, and J.R. Row. 2004. Phenotypic consequences of nest-site selection in black rat snakes (Elaphe obsoleta). Canadian Journal of Zoology 82:449–456.

Blouin-Demers, G., pers. comm. 2005. Conversation with J. Row. September 2005. Associate Professor, University of Ottawa.

Blouin-Demers, G., H.L. Gibbs, and P.J. Weatherhead. 2005. Genetic evidence for sexual selection in black ratsnakes, (Elaphe obsoleta). Animal Behaviour 69:225-234.

Brana, F., and X. Ji. 2000. Influence of incubation temperature on morphology, locomotor performance, and early growth of wall lizards (Podarcis muralis). Journal of Experimental Zoology 286:422-433.

Brooks, R.J., G.P. Brown, and D.A. Galbraith. 1991. Effects of a sudden increase in natural mortality of adults on a population of the common snapping turtle, Chelydra serpentina. Canadian Journal of Zoology 69:1314-1320.

Burbrink, F.T., R. Lawson, and J.B. Slowinski. 2000. Mitochondrial DNA phylogeography of the polytypic North American rat snake (Elaphe obsoleta): A critique of the subspecies concept. Evolution 54(6):2107-2118.

Burbrink, F.T. 2001. Systematics of the Eastern Ratsnake complex (Elaphe obsoleta). Herpetological Monographs 15:1-53.

Carson, H.L. 1959. Genetic conditions which promote or retard the formation of species. Cold Spring Harbor Symposium in Quantitative Biology 24:87-105.

Conant, R., and J.T. Collins. 1998. A field guide to the reptiles and amphibians of Eastern and Central North America, Third Edition. Houghton Mifflin Company, Boston, Massachusetts.

Congdon, J.D., A.E. Dunham, and R.C. Van Loben Sels. 1993. Delayed sexual maturity and demographics of Blanding's Turtles (Emydoidea blandingii): implications for conservation and management of long-lived organisms. Conservation Biology 7:826-833.

Costanzo, J.P. 1989. Effects of humidity, temperature, and submergence behaviour on survivorship and energy use in hibernating garter snakes, Thamnophis sirtalis. Canadian Journal of Zoology 67:2486-2492.

Christian K.A., and Tracy C.R. 1981. The effect of the thermal environment on the ability of hatchling Galapagos land iguanas to avoid predation during dispersal. Oecologia 49:218-223

Crother, B. I. et al. 2003.Scientific and standard English names of amphibians and reptiles of North America north of Mexico: update. Herpetological Review 34(3):196-203.

Durner, G.M., and J.D. Gates. 1993. Spatial ecology of black rat snakes on Remington farms, Maryland. Journal of Wildlife Management 57:812-826.

Duméril, A.M.C., G. Bibron, and A.H.A. Duméril. 1854. Erpétologie Générale Historie Naturelle Compléte des Reptiles. Librarie Encyclopédia de Roret. Paris Vol 7. Pt. 1:1-780.

Ernst, C.H., and R.W. Barbour. 1989. Snakes of Eastern North America. George Mason University Press, Fairfax, Virginia, USA.

Ernst, C.H., and E.M. Ernst. 2003. Snakes of the United States and Canada. Smithsonian Institute Press, Washington D.C., USA.

Fitch, H.S. 1963. Natural history of the Black Rat Snake (Elaphe o. obsoleta) in Kansas. Copeia 1963:649-653.

Futuyma, D.J. 1986. Evolutionary biology; Second Edition. Sinauer, Sunderland, Massachusetts, USA.

Gapare, W.J., S.N. Aitken, and C.E. Ritland. 2005. Genetic diversity of core and peripheral Sitka spruce (Picea sitchensis (Bong.) Carr) populations: implications for conservation of widespread species. Biological Conservation 123:113-123.

Gannon, V. 1978. Factors limiting the distribution of the prairie rattlesnake. Blue Jay 36:142-144.

Gartshore, M., pers. comm. 2006. Conversation with J. Row. June 2006. Consulting Ecologist, Walsingham, Ontario.

Gibbs, H.L., S.J. Corey, G. Blouin-Demers, K.A. Prior, and P.J. Weatherhead. 2006. Hybridization between mt-DNA-defined phylogeographic lineages of ratsnakes (Pantherophis sp.). Molecular Ecology 15:3755-3768.

Gibson, A.R., D.A. Smucny, and J. Kollar, 1989. The effects of feeding and ecdysis on temperature selection by young garter snakes in a simple thermal mosaic. Canadian Journal of Zoology 67:19-23.

Gillingham, J.C. 1980. Communication and combat behaviour of the black rat snake (Elaphe obsoleta). Herpetologica 36:120-127.

Holbrook, J.E. 1836. North American Herpetology; or, a Description of the Reptiles inhabiting the United States, Vol. 3. J. Dobson, Pittsburgh, USA.

Huey, R.B., and J.G. Kingsolver. 1989. Evolution of thermal sensitivity of ectotherm performance. Trends in Ecology and Evolution 4:131-135.

Keller, L.F., and D.M. Waller. 2002. Inbreeding effects in wild populations. Trends in Ecology and Evolution 17:230-241.

Kelly, K. 1990. Damaged and efficient landscapes in rural southern Ontario, 1880-1900. Pp. 213-227 in G. Wynn (ed.). People, places, patterns, processes: geographical perspectives on the Canadian past. Copp Clark Pitman, Toronto, Ontario.

Lacey, R. C., M. Borbat, and J. P. Pollak. 2003. VORTEX: A Stochastic Simulation of the Extinction Process, Version 9. Chicago Zoological Society, Brookfield, Illinois, USA.

Leggo, J., pers. comm. 2005. Email Correspondence to J. Row. November 2005. Ecosystem Scientist, St. Lawrence Islands National Park.

Lesica P. and F.W. Allendorf. 1995. When are peripheral populations valuable for conservation? Conservation Biology 9:753-760.

Levin, D.A. 1993. Local speciation in plants: the rule not the exception. Systematic Botany 18:197-208.

Lindsay, R.V. 1931. The Pilot Black-Snake in Ontario. Canadian Field-Naturalist 45:83-85.

Lougheed, S.C., H.L. Gibbs, and K.A. Prior. 1999. Hierarchical patterns of genetic population structure in black rat snakes (Elaphe obsoleta obsoleta) as revealed by microsatellite DNA analysis. Evolution 53:1995-2001.

Logier, E.B.S. 1925. Note on the herpetology of Point Pelee, Ontario. Canadian Field-Naturalist 39:91-95.

Logier, E. B. S. 1957. Changes in the amphibian and reptile fauna of Ontario. Pp. 13-18 in F. A. Urquhart (ed). Changes in the fauna of Ontario. University of Toronto Press, Toronto, Ontario.

Martin, D., pers. comm. 2006. Email conversation to J. Row. April 2006.

McKenzie, R. 1967. Leeds and Grenville: their first two hundred years. McClelland and Stewart, Toronto, Ontario, Canada.

NatureServe. 2007. NatureServe Explorer: An online encyclopedia of life. Version 6.1. NatureServe, Arlington, Virginia, USA.

Norris, T., pers. comm. 2005. Email correspondance to J. Row. District Ecologist, Peterborough District, Ontario Ministry of Natural resources.

Neill, W.T. 1949. A new subspecies of rat snake (genus Elaphe), and notes on related forms. Herpetologica 5:1-12.

Oldham, M.J. and W.F. Weller. 2000. Ontario Herpetofaunal Atlas. Natural Heritage Information Centre, Ontario Ministry of Natural Resources.

Peterson, C.R., A.R. Gibson, and M.E. Dorcas. 1993 Snake thermal ecology: the causes and consequences of body temperature variation. Pp. 241-314 in R.A. Seigel, J.T. Collins, and S.S. Novak (eds.). Snakes: Ecology and Behaviour, McGraw-Hill, New York.

Pielou, E. C. 1991. After the ice age: the return of life to glaciated North America. The University of Chicago Press, Chicago, Illinois.

Prior, K.A. and C.M. Shilton. 1996. Post-hibernation mortality in black rat snakes, Elaphe obsoleta obsoleta. Journal of Herpetology 30:275-278.

Prior K.A., and P.J. Weatherhead. 1996. COSEWIC status report on the Black Rat Snakes (Elaphe obsoleta obsoleta). Committee on the Status of Endangered Wildlife in Canada. Ottawa. 1-37pp.

Prior, K.A., H.L. Gibbs, and P.J. Weatherhead. 1997. Population genetic structure in the black rat snake: implications for management. Conservation Biology 11: 1147-1158.

Prior, K.A., G. Blouin-Demers, and P.J. Weatherhead. 2001. Sampling biases in demographic analyses of black rat snakes (Elaphe obsoleta). Herpetologica 57:460-469.

Qualls, C.P., and R.M. Andrews. 1999. Cold climates and the evolution of viviparity in reptiles: cold incubation temperatures produce poor-quality offspring in the lizard, Sceloporus virgatus. Biological Journal of the Linnean Society 67:353-376.

Rigley, L. 1971. “Combat dance” of the black rat snake, Elaphe o. obsoleta. Journal of Herpetology 5:65-66.

Rodda, G.H. 1990. Highway madness revisited: road-killed Iguana iguana in the llanos of Venezuela. Journal of Herpetology 24:209-211.

Row, J.R. 2006. Ranking the suitability and importance of habitat for Eastern Ratsnakes (Elaphe obsoleta) in eastern Ontario. Report for the Interdepartmental Recovery Fund.

Row, J.R., G. Blouin-Demers, P.J. Weatherhead. 2007. Demographic effects of road mortality on black ratsnakes (Elaphe obsoleta). Biological Conservation 137:117-124.

Say, T. 1823. Clouber obsoletus, Pp. 140. in E. James (ed.). Account of an Expedition to the Rocky Mountains, Performed in the Years 1819 and ’20. Logman, Hurst, Rees, Ovme and Brown, London.

Shine, R., M. Lemaster, M. Wall, T. Langklide and R. Mason. 2004. Why did the snake cross the road? Effects of roads on movement and location of mates by garter snakes (Thamnophis sirtalis parietalis). Ecology and Society 9:9.

Simpson, G.G. 1944. Tempo and mode in evolution. Columbia University Press, New York.

Smith, P.W. 1957. An analysis of post-Wisconsin biogeography of the prairie peninsula region based on distributional phenomena among terrestrial vertebrate populations. Ecology 38:205-218.

Tews, J. 2005. Individual-based population viability analysis of the black rat snake Elaphe obsoleta obsoleta. ELUTIS Modelling and Consulting Inc. Report for St. Lawrence Islands National Park.

Thompson, S., pers. comm. 2005. Email correspondance to J. Row. November 2005. District Ecologist, Kemptville District, Ontario Ministry of Natural Resouces.

Thompson, S., pers. comm., 2006. Email correspondance to J. Row. April 2006. District Ecologist, Kemptville District, Ontario Ministry of Natural Resouces.

Toner, G.C. 1934. Pilot Black-snake, Elaphe o. obsoleta, in Ontario. Copeia 1934:47.

Weatherhead, P.J. 1989. Temporal and thermal aspects of hibernation of black rat snakes (Elaphe obsoleta) in Ontario. Canadian Journal of Zoology 67:2332-2335.

Weatherhead, P.J., and D.J. Hoysak. 1989. Spatial and activity patterns of black rat snakes (Elaphe spiloides) from radiotelemetry and recapture data. Canadian Journal of Zoology 67:463-468.

Weatherhead, P.J., G. Blouin-Demers, and K.A. Prior. 2002. Synchronous variation and long-term trends in two populations of black rat snakes. Conservation Biology 16(6):1602-1608.

Weatherhead, P.J., G. Blouin-Demers and K. Cavey. 2003. Seasonal and prey-size dietary patterns of black ratsnakes (Elaphe obsoleta obsoleta). American Midland Naturalist 150:275-281.

Weber, J.H. 1928. Herpetological observations in the Adirondack Mountains, New York. Copeia 1928:106-112.

Woodliffe, A., pers. comm. 2006. Review of draft report. October 2006. Ministry of Natural Resources.

Yagi, A.R. and R. Tervo. 2006. Black ratsnake telemetry project 2001 to 2002 Oriskany sandstone area- Carolinian population final report for Ontario Ministry of Natural Resources Species at Risk, Peterborough, Ontario. 19 pp.


Biographical Summary of Report Writer

Jeffrey Row completed his undergraduate degree from Queen’s University in 2001 and since that time has been researching the ecology and evolution of snakes. He has been assisting with long-term research projects on Eastern Ratsnakes at the Queen’s University Biological Station and concurrently completed a Master’s Degree on the thermal ecology and behaviour of eastern milksnakes at the University of Ottawa (2003–2005). He has also worked closely with the Eastern Ratsnake recovery team in completing an assessment of suitable habitat for Eastern Ratsnakes across the Frontenac Axis (2006). Relevant publications include:

Row, J.R. and G. Blouin-Demers. (In Press) Thermal quality influences habitat selection at multiple spatial scales in milksnakes. Ecoscience.

Row, J.R. and G. Blouin-Demers. 2006. Thermal quality influences effectiveness of thermoregulation, habitat use and behaviour in milk snakes. Oecologia 148:1-11.

Blouin-Demers, B., P.J. Weatherhead, and J.R. Row. 2004. Phenotypic consequences of nest-site selection in black rat snakes (Elaphe obsoleta). Canadian Journal of Zoology 82:449-456.

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