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Abundance of an invasive bivalve,
 Corbicula fluminea
 , is negatively related to growth of freshwater mussels in the wild

Freshwater mussels (Order Unionoida) once dominated benthic biomass in many streams worldwide, but they are now among the most imperilled organisms on Earth (Lopes-Lima et al., 2017; Strayer et al., 2004). In the 1970s, entire mussel assemblages began to disappear rapidly in U.S.A. streams, and these declines continue across a large area (Haag, 2019). These declines are enigmatic because clear causes are not evident and other components of aquatic communities are relatively unaffected. Several anthropogenic sources of water pollution are proposed causes of mussel declines (e.g. ammonia, coal mining; Wang et al., 2007; Zipper et al., 2016). However, Received: 26 May 2020 | Revised: 18 August 2020 | Accepted: 15 October 2020 DOI: 10.1111/fwb.13651