{"accessLevel": "public", "bureauCode": ["010:24"], "contactPoint": {"@type": "vcard:Contact", "fn": "NPS IRMA Help", "hasEmail": "mailto:NRSS_DataStore@nps.gov"}, "description": "Datasheets scans in .pdf format for years 1 and 2 of the mussel inventory at Ozark National Scenic Riverways. Labelled based on eventID.\n\nThe Ozark National Scenic Riverways (OZAR) is a national\u202fpark unit located in\u202fthe Ozarks region of Missouri and encompasses\u202fmuch of the mainstem Jacks Fork and Current River.\u202fPast surveys of freshwater mussel populations indicated potential declines for many species\u202fin OZAR.\u202fWe conducted occupancy-based surveys at\u202f60 randomly selected sites during 2023\u20132024\u202fto update species inventories and establish a repeatable baseline.\u202fWe also examined fish and mussel records to determine if the absence of host fish should be further investigated as a potential cause of mussel decline.\u202fVisual searches detected 13 mussel species, with catch-per-unit-effort (CPUE) and species richness lower than previous surveys, suggesting continued decline.\u202fMean species-level occupancy across the mussel community\u202f(i.e., all species detected)\u202fwas low (<25%), and detection probability for observing a freshwater mussel during a 45-minute\u202fperson-survey averaged 29%.\u202fMussel occurrence decreased in\u202fspring-influenced reaches and riffle habitats but increased in off-channel and glide/race habitats. A\u202fhost\u202ffish linkage index indicated that most mussel species have viable hosts present, though species dependent on few or lentic-associated hosts may face reproductive limitations. These results provide managers with actionable data for conservation planning and\u202foutline potential future\u202fsurvey methods, including\u202ftargeted habitat\u202fsampling\u202fto sustain mussel diversity in OZAR.", "distribution": [{"@type": "dcat:Distribution", "description": "Year 1 datasheet scans from OZAR mussel inventory", "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/758928?Reference=2318483", "format": "zip", "mediaType": "application/zip", "title": "OZAR_MusselInventory_Year1DataSheetScans.zip"}, {"@type": "dcat:Distribution", "description": "Year 2 datasheet scans from OZAR mussel inventory", "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/758929?Reference=2318483", "format": "zip", "mediaType": "application/zip", "title": "OZAR_MusselInventory_Year2DataSheetScans.zip"}], "identifier": "http://datainventory.doi.gov/id/dataset/NPS_DataStore_2318483", "issued": "2026-05-21T00:00:00Z", "keyword": ["Bivalves", "Freshwater mussels", "IMD", "Mussels", "NPS", "NPS Inventory and Monitoring Division", "NPS Species Inventory Program", "National Park Service", "OZAR", "Open-format", "Ozark National Scenic Riverways"], "landingPage": "https://irma.nps.gov/DataStore/Reference/Profile/2318483", "modified": "2026-05-21T00:00:00Z", "programCode": ["010:118", "010:119"], "publisher": {"@type": "org:Organization", "name": "National Park Service"}, "spatial": "-91.69997,36.81306,-90.88682,37.4557228", "temporal": "2023-06-20/2024-07-25", "theme": ["Generic Dataset"], "title": "Mussel Inventory at Ozark National Scenic Riverways - Datasheet scans"}