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Research Document - 2011/027

Recovery Potential Assessment for Hotwater Physa (Physella wrighti)

By R. Lauzier, S.C. Davies, and J. Heron

Abstract

Hotwater physa (Physella wrighti) is a freshwater pulmonate snail endemic to the hot springs complex of the Liard River Hotsprings Provincial Park The snail is present in two hot springs pools, their outlet streams and in a portion of a warm-water swamp. Survey estimates of previous studies are reviewed, and the results of the most recent survey are provided along with a survey protocol designed to minimize harm and habitat disturbance, yet provide consistency for estimates of relative abundance. Relative abundance estimates are likely biased low due to the cryptic nature of the animal and complexity of the habitat it occupies. While specific life history parameters are unknown, the semelparous life history strategy, short generation time and evidence from other related species implies the productivity is high. The occupying habitat characteristics are provided. Potential threats of proposed industrial development to the source water are provided. Potential threats and impacts to the habitat by recreational use of the hot springs complex are provided along with mitigating measures to ensure sustainability of the endemic population at its present relative abundance and distribution. Recommendations are provided for further research required to fill basic information gaps to understand the biological parameters of Hotwater physa in order to better assess the risks and vulnerabilities of the Hotwater physa population exposed to human activities.

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