Oral Presentation Society for Freshwater Science 2025 Annual Meeting

Influence of Soil and Environmental Characteristics on Procambarus clarkii Burrowing in Southeast Michigan Golf Course Waterbodies (117827)

Colin Assenmacher 1 , Sarah Walker 1 , William Ota 1 , Aaron Sullivan 1 , Lucas Nathan 2 , Kathleen Quebedeaux 2 , Brennen Wright 2 , Brian Roth 1
  1. Fisheries and Wildlife, Michigan State University, East Lansing, MI
  2. Fisheries Division, Michigan Department of Natural Resources, Waterford, MI

Procambarus clarkii are the world’s most widespread invasive crayfish species and first established in Michigan in 2017. P.clarkii are of high concern due to their extensive burrowing behavior, which can damage human infrastructure through bank erosion and decrease bank stability. Our research aimed to investigate how soil and environmental characteristics of pond banks relate to P.clarkii burrow density. We measured key soil characteristics and potentially influential environmental variables from July to August of 2024 at 74 sites invaded by P.clarkii in Southeast Michigan to quantify which physical properties influence variations in burrow density within a waterbody and across multiple waterbodies. These sites were spread across 13 invaded waterbodies at three golf courses with varying burrow densities. Calculated burrow density was based on surveys conducted during the 2023 and 2024 field seasons and ranged from 0 to 8.42 burrows per square meter across sample sites and targeted waterbodies. We collected soil cores at each site to determine particle size, percent organic matter, penetration resistance, bulk density, and profile soil horizons. Bank slope, percent vegetation cover, and canopy cover were measured at each coring location. Preliminary analysis indicates that P.clarkii prefer specific soil and environmental characteristics when burrowing. Principle component analysis identifies that the ratio of fine (clay & silt) to coarse (sand & gravel) substrate most strongly influences crayfish burrow density. An increased percentage of fine substrate is positively correlated with burrow density. Other characteristics including bank slope and soil penetration resistance also appear to influence burrowing. These findings help to identify the physical characteristics of high burrowing areas, which will be used to assist in the development of preventative management strategies against P.clarkii establishment and burrowing.