Principle Investigator: Dr. Jacob Westhoff
Students and Staff: Master's student TBD
Objectives:
Design a multi-method sampling protocol for mussels capable of implementation across a wide variety of potential habitat types
Conduct intensive mussel surveys in nine stream reaches where habitat mapping is planned and link local-scale distributions to habitat characteristics
Summarize fish-mussel host relationships based on fish and mussel data collected within target rivers
Overview:
Freshwater mussels are one of the most imperiled faunal groups in Missouri and in North America. The latest estimate indicates that 70% of the North American fauna has been accorded some level of conservation status (Stein et al. 2000). In Missouri, nearly 50% of the mussel fauna is considered a species of conservation concern (SOCC; S1-S3), ranking them second only to crayfish (by percentage) as the most threatened fauna in the state. Most of the mussel SOCC, 14 species, are S1 or Critically Imperiled. Fifteen species are recognized under The Wildlife Code as State Endangered, and eleven are listed as Federally Threatened or Endangered (MDC 2022). Approximately 65 species of freshwater mussels occur in Missouri, with species richness and diversity higher in Ozark rivers.
The Missouri Mussel Conservation and Management Plan (MDC 2008) guides MDC’s mussel conservation efforts and identifies high priority objectives to “Establish standardized quantitative and qualitative mussel sampling protocols to facilitate resource management evaluations, status assessments, presence/absence determinations, and relocations” and “Determine suitable physical and chemical habitat requirements for all life stages to identify factors limiting populations”. This proposed project will address both of those information needs and will advance our knowledge to the point where we can develop regional or statewide predictive models of mussel distribution and create a long-term standardized sampling program capable of tracking the status of mussel communities at priority locations.
The first objective will involve sampling select river reaches around the state of Missouri using multiple mussel sampling methods to determine which methods are most efficient and what level of effort is required to meet sampling goals. For the second objective, we will use data collected from Objective 1 and combine it with detailed habitat mapping from a companion project to assess habitat associations. The third objective will take advantage of an existing dataset of fish data to compare to the mussel data for any insights into fish-host relationships.
Partners:
Steve McMurray (MO Dept. Conservation Project Lead), Andy Roberts (U.S. Fish and Wildlife Service Missouri Ecological Services Field Office), MO Department of Conservation Staff (Travis Moore, Annie Hentschke, Kelly Rezac, Blake Stephens, Paul Cielewicz, Brian McKeage, Jason Persinger, Dyan Pursell, Sherry Gao), Brandon Sansom (USGS Columbia Environmental Research Center)
Funding:
Missouri Department of Conservation
Duration:
Autumn 2025 - Autumn 2027 or Winter 2028 ( 2 - 2.5 years)