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Algal flux affects the clearance rates of recently metamorphosed freshwater mussels

机译：藻类通量影响最近变态的淡水贻贝的清除率

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摘要

Despite their role as ecosystem engineers, which is in large part a consequence of their suspension feeding activities, the early life history of unionid mussels is not well understood. We examined the suspension feeding rates (i.e., clearance rates, CR) of recently metamorphosed juvenile Lampsilis siliquoidea (1-4 week old), Lampsilis fasciola (1-3 week old), Villosa iris (2 week old), and Ligumia nasuta (1 week old) under ecologically relevant flux conditions in a recirculating racetrack flow chamber system. The range of velocities examined was determined experimentally using a permeameter containing riverbed material (63 mu m to 6.5 cm diameter) in which juvenile mussels are thought to reside. The CR of the juvenile unionid species increased linearly with algal flux and the ranking of CR among species was V. iris > L. siliquoidea > L. nasuta > L. fasciola. CR also increased with the age (or size) of the mussel cohort but within a species CR increased non-linearly with shell length of the individual. These results provide new insight into the feeding abilities of recently metamorphosed juvenile mussels as well as potential threats to their growth and survival, which contributes to our understanding of their habitat requirements and may assist in the conservation of this imperiled taxon.
机译：尽管他们是生态系统工程师，这在很大程度上是悬浮饲料活动的结果，但对混成贻贝的早期生活史却知之甚少。我们检查了最近变态的幼龄美洲鳄兰（1-4周龄），fasciola（1-3周龄），虹膜鸢尾（2周龄）和鼻柳（Ligumia nasuta）（ 1周大），在循环赛道流动室系统中在与生态相关的通量条件下进行。使用含有河床物质（直径为63微米至6.5厘米）的渗透仪，通过实验确定了检查的速度范围，认为其中存在贻贝。幼小类混虫种的CR随藻类通量线性增加，在种间的CR等级为鸢尾>鸢尾>纳苏塔>水松L. fasciola。 CR随贻贝种群的年龄（或大小）而增加，但在一个物种内，CR与个体的壳长成非线性关系。这些结果为新近变态的贻贝的摄食能力以及对它们的生长和生存的潜在威胁提供了新的见解，有助于我们了解它们的栖息地需求，并可能有助于保护这一濒临灭绝的分类单元。

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