Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Freshwater mussels (Bivalvia: Unionidae) are the most imperilled taxon in Canada. To facilitate species recovery efforts, an understanding of species distribution and habitat that supports species persistence is needed. Detecting mussels presents unique challenges and requires considerable effort owing to their complex life histories and widespread declines. Here, observations of the imperilled Wavyrayed Lampmussel (Lampsilis fasciola Rafinesque, 1820) from the Grand and Thames rivers, Ontario, Canada, were used to quantify species detection and occupancy probabilities, and the relationship between occupancy probability and substrate size. The best model for the data included a river-specific covariate for detection and an intercept model for occupancy. Detection probability of Wavyrayed Lampmussel was higher in the Grand River than in the Thames River. Limited variation in substrate size measurements restricted occupancy modelling, but field measurements qualitatively aligned with previous habitat descriptions. Overall, knowledge of species detection and occupancy probabilities for Wavyrayed Lampmussel will not only enhance the understanding of species distribution and habitat associations, but also ensure that the response of the species to threats and recovery actions are captured.

中文翻译：

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加拿大安大略省Wavyrayed Lampmussel (Lampsilis fasciola) 的占有率和检测

加拿大渔业和水产科学杂志，提前印刷。
淡水贻贝（双壳类：Unionidae）是加拿大最危险的分类群。为了促进物种恢复工作，需要了解支持物种持久性的物种分布和栖息地。由于贻贝复杂的生活史和广泛的衰退，检测贻贝提出了独特的挑战，需要付出相当大的努力。在这里，对来自加拿大安大略省格兰德河和泰晤士河的濒危 Wavyrayed Lampmussel (Lampsilis fasciola Rafinesque, 1820) 的观察被用来量化物种检测和占用概率，以及占用概率与底物大小之间的关系。数据的最佳模型包括用于检测的特定河流协变量和用于占用率的截距模型。波浪纹蓝贻贝在格兰德河的检测概率高于泰晤士河。基质尺寸测量的有限变化限制了占用建模，但现场测量定性地与先前的栖息地描述一致。总体而言，Wavyrayed Lampmussel 物种检测和占用概率的知识不仅可以增强对物种分布和栖息地关联的理解，还可以确保捕捉到物种对威胁和恢复行动的反应。