Investigation of stressors on freshwater mussel populations

地球上淡水贻贝的多样性最大的是北美；不幸的是，它们是最危险的生物群之一。例如，安大略省南部拥有加拿大发现的53种淡水贻贝中的42种，其中13种被归类为濒危或濒危物种。监测淡水贻贝种群的传统方法是资源和劳动力密集型的(例如，定时搜索和样方调查)。也可能需要5到10年的时间才能确定人口的显著下降。例如，渔业和海洋部监测被列为濒临灭绝的淡水贻贝种群，但由于监测一个物种和濒危贻贝物种的数量需要大量资源，他们只能每五年轮流评估特定地点的种群。这就需要一种更快速的非致命性诊断工具来评估濒危淡水贻贝种群的健康状况。因此，我的研究计划的最终研究问题是，新陈代谢组的变化是否将是淡水贻贝种群内压力的有效非致命性衡量标准。我的研究计划的三个短期目标集中在了解导致实验室培养和野生种群血淋巴代谢组变化的因素。 1)研究原产于加拿大的淡水贻贝物种血淋巴中代谢组的变化 2)研究淡水贻贝在不同类型应激源下血淋巴代谢组的变化。 3)调查了安大略省五大湖流域野生淡水贻贝血淋巴代谢组的变化。 了解新陈代谢组变异的基本驱动因素，对于描述在淡水贻贝种群中使用新陈代谢组作为应激指标的统计能力至关重要。血淋巴被选为目标组织，因为代谢分析所需的体积可以被移除，而不会对单个贻贝产生不利影响。制定非致命性终点将允许直接评估受威胁和濒危淡水贻贝物种的压力源，而不会对自然种群产生影响。 长期目标是应用我们所学到的知识来实现这三个短期目标，以扩大血淋巴代谢分析的应用，以调查栖息地变化的影响(例如，温度、养分输入、总悬浮固体等)。以及对淡水贻贝健康的微生物威胁。希望我们能够开发一种诊断工具，使我们能够以非致命性的方式收集关于濒危人口健康的数据，然后这些数据可以帮助制定和监测恢复和重新引入计划。

The greatest diversity of freshwater mussels on the planet is found in North America; unfortunately, they are one of the most imperiled group of organisms. For example, the southern portion of the province of Ontario contains 42 of the 53 freshwater mussel species found in Canada, and 13 of these species are classified as threatened or endangered. The traditional approach to monitoring freshwater mussel populations is resource and labour intensive (e.g., timed searches and quadrat survey). It can also take 5 to 10 years before the significant decline of a population is identified. For example, the Department of Fisheries and Oceans monitor freshwater mussel populations classified as at risk of extinction, but due to the large amount of resources required to monitor one species and the number of imperiled mussel species, they are only able to assess populations at a specific site on a five-year rotation. This generates the need for a more rapid non-lethal diagnostic tool to assess the health of a population of at-risk freshwater mussel species. Consequently, the ultimate research question for my program of study is whether changes in the metabolome will be an effective non-lethal measure of stress within freshwater mussel populations. The three short-term objectives of my research program focus on understanding factors that contribute to variation in the hemolymph metabolome of laboratory-cultured and wild populations. 1) Investigate the variation in the metabolome present in the hemolymph of freshwater mussel species native to Canada 2) Investigate changes in the hemolymph metabolome of freshwater mussel species under various types of stressors. 3) Investigate the variation in the hemolymph metabolome of wild freshwater mussel species in the Great Lakes basin of Ontario. Understanding basic drivers of variation in the metabolome is critical to characterizing the statistical power of using the metabolome as an indicator of stress in a freshwater mussel population. Hemolymph has been chosen as the target tissue because the volume required for metabolomic analyses can be removed without having an adverse effect on the individual mussel. The development of a non-lethal endpoint would allow for a direct assessment of stressors on threatened and endangered freshwater mussel species without having an impact on natural populations. The long-term objective is the apply what we have learnt accomplishing these three short-term objectives to expand the use of metabolomic analyses of hemolymph to investigate the effect of habitat alteration (e.g., temperature, nutrient inputs, total suspended solids, etc.) and microbiological threats on the health of freshwater mussels. The hope is that we can develop a diagnostic tool that will allow us to non-lethally collect data on the health of endangered populations, which could then aid in the development and monitoring of recovery and reintroduction plans.