Stable Isotopes, Mercury and Organochlorines in the Eastern Foxsnake (Pantherophis vulpinus) and Eastern Gartersnake (Thamnophis siratilis sistalis) from Southwestern Ontario, Canada.

IF 1.9 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Bulletin of Environmental Contamination and Toxicology Pub Date : 2026-07-22 DOI:10.1007/s00128-026-04302-2

Ken G Drouillard, Ava Cashera, Melanie Gosselin, Dennis Otieno, Nargis Ismail, Julie Charlton, Crystal Antaya, Melanie LeFaive, Tammy Dobbie

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引用次数: 0

Abstract

Road-killed Eastern Foxsnakes (Pantherophis vulpinus) and Eastern Gartersnakes (Thamnophis sirtalis sirtalis) from Southwestern Ontario, Canada, inclusive of samples from Point Pelee National Park (PPNP), were analysed for stable isotopes, mercury and organochlorines. Stable isotopes revealed differences in feeding ecology between the species, with foxsnakes presenting higher trophic status relative to gartersnakes at PPNP. Total Hg did not differ between location, species or body size. Foxsnakes from PPNP were enriched in ∑PCBs and ∑DDTs over gartersnakes but also distinct in chemical signatures from foxsnakes from other locations. 30% of foxsnakes and gartersnakes from PPNP had ∑DDTs/∑PCBs ratios > 2 suggesting foraging ranges of some individuals overlap with former DDT application areas of the park. Hazard assessment revealed high ∑DDT concentrations relative to Canadian tissue residue guidelines for the protection of wildlife in some individual foxsnakes from PPNP, but not for gartersnakes.

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加拿大安大略省西南部东部狐蛇（Pantherophis vulpinus）和东部蛇（Thamnophis siratiis sistalis）的稳定同位素、汞和有机氯。

对来自加拿大安大略省西南部被公路撞死的东部狐蛇（Pantherophis vulpinus）和东部蛇（Thamnophis sirtalis sirtalis），包括来自Pelee角国家公园（PPNP）的样本进行了稳定同位素、汞和有机氯的分析。稳定同位素揭示了不同物种之间摄食生态的差异，在PPNP中，狐蛇相对于吊袜带蛇具有更高的营养地位。总汞含量在地点、物种和体型之间没有差异。PPNP狐狸蛇的∑PCBs和∑DDTs含量高于吊袜带蛇，但化学特征与其他地区的狐狸蛇不同。PPNP中30%的狐蛇和吊带蛇的DDTs/ PCBs比值为bbb2，表明部分个体的觅食范围与公园前DDT使用区域重叠。危害评估显示，相对于加拿大野生动物组织残留保护指南，某些狐蛇个体的∑DDT浓度较高，但吊袜带蛇的∑DDT浓度不高。

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来源期刊

Bulletin of Environmental Contamination and Toxicology 环境科学-毒理学

CiteScore

5.60

自引率

3.70%

发文量

230

审稿时长

1.7 months

期刊介绍： The Bulletin of Environmental Contamination and Toxicology(BECT) is a peer-reviewed journal that offers rapid review and publication. Accepted submissions will be presented as clear, concise reports of current research for a readership concerned with environmental contamination and toxicology. Scientific quality and clarity are paramount.