Eastern Hognose Snake (Heterodon Platirhinos)

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R2 Sensitive Species List Recommendation Eastern Hognose Snake (Heterodon platirhinos) By Gary Patton 12/7/01 Recommendation: Not R2 SS, but consider for Other Emphasis Species Lists Rationale: This is an eastern species with limited potential to occur on easternmost R2 grassland units. Over much of its core range, the species still seems reasonably secure, though there are some problems in the upper Midwest and Northeast. In Kansas it is rated as vulnerable and in South Dakota, imperiled. Yet in Nebraska, it is considered apparently secure. Historically, the eastern hognose snake occurred rarely at its western periphery on the Cimarron NG. Collins and Collins (1991), however, believe the species may have been extirpated from the Grasslands during the Dust Bowl years. In Nebraska, this species apparently ranges westward along the Niobrara River drainage to around the Fort Niobrara National Wildlife Refuge. The nearest NFS unit, then, is the Samuel R. McKelvie National Forest, a short distance west of the refuge. So, it is possible that the westernmost extension of this species could reach the SRM NF. Likewise, the species could occur on the Fort Pierre NG in South Dakota. Any potential occurrence of the species on NFS lands will be at the extreme periphery of the species natural range. For this reason, suitable habitat is likely limited or marginal in nature, and species occurrence will be naturally rare and spotty . Still, Mackessy believes the limited sandy habitats of this species along streams and rivers, are very vulnerable and subject to modification through water impoundment, channelization, and ground water depletion. While there may not be justification for sensitive species status for this species on NFS lands, we suggest that NFS grasslands units (especially Nebraska) seek to identify populations at risk, for which FS could contribute to its survival. In such case, we suggest the species be treated as species of local management concern on that unit. Note: In addition to the evaluator’s references, also referred to biodiversity documentation at Natureserve.com,; distribution data from the Colorado Herpetological Society; Collins and Collins (1991) Reptiles and Amphibians of the Cimarron National Grasslands, Morton County, Kansas; Amphibians and Reptiles of Nebraska, 2000, Coop. Unit, Univ. Neb. .

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Habitats Bottomland Forests; Interior Rivers and Streams; Mississippi River
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Appendix A: Reptiles Eastern Hog‐nosed Snake Heterodon platirhinos Federal Listing N/A State Listing E Global Rank G5 State Rank S1 Regional Status Very High Photo by New Boston Air Force Station Justification (Reason for Concern in NH) The eastern hognose snake was listed as Threatened by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) as of January 1, 2001 and is considered a species of regional concern in the northeastern United States (Therres 1999). Eastern hognose snakes were listed as a species of ‘Severe’ and ‘Very High’ concern in the northeast United States (NEPARC 2011, Northeast RSGCN list 2014). In New England, the eastern hognose snake is listed as S2 in Rhode Island, S2S3 in Connecticut, and S4 in Massachusetts; it doesn’t occur in Maine. The species was previously unknown from Vermont but a single individual was confirmed in southeastern part of the state within the last 10 years. New Hampshire’s peripheral population of hognose snakes is state endangered (RSA 212‐A, FIS 1000). Hognose snakes in New Hampshire have large home ranges (LaGory et al. 2009, Goulet 2010, Goulet and Mills 2011, Goulet et al. 2015) and are restricted to the Merrimack River corridor south of Concord, an area where development and human population increases are intense and remaining blocks of suitable habitat are becoming smaller and isolated (SPNHF 2005). In addition, the sandy, well‐drained soils preferred by hognose snakes are easily converted to residential and commercial developments and are targeted for commercial sand extraction operations. Distribution The eastern hognose snake is found from southern New England and Ontario south along Atlantic coast to Florida and west to Texas, Kansas, Nebraska, and South Dakota (Ernst and Ernst 2003).
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Natural History of the Hognose Snakes Heterodon Platyrhinos and Heterodon Nasicus
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