Ecology and Genetics of Spread of Zebra Mussels to Inland Water Bodies in Minnesota

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1 Ecology and Genetics of Spread of Zebra Mussels to Inland Water Bodies in Minnesota Michael A. McCartney and Sophie Mallez MAISRC, University of Minnesota April 15, 2016 State of Water Conference Alexandria, Minnesota

2 Ecology and genetics of ZM spread: research projects at MAISRC Rates of spread suggest that invasion pathways in Minnesota differ from other US states Identifying pathways can target prevention

3 Ecology and genetics of ZM spread: research projects at MAISRC 1. Research on mechanisms (vectors) of spread waterways and overland 2. Determining sources and pathways: genetics and genomics

4 Mechanisms (vectors) of zebra mussel spread to inland lakes Overland via recreational boating Veligers in water (in hulls, live wells, etc.) Mussels attached to vegetation (entangled on trailers, motors, etc.) or to docks, lifts, boat hulls Natural spread through interconnected waterways Downstream dispersal of veliger larvae or other life stages (e.g. rafting juveniles)

5 Studies of downstream spread: US lake-stream systems, From Bobeldyk et al. (2005)

6 2 4 1 Map River/strea m Study years 1 Gull River Pine River Minnehaha Creek Pelican River 2014, 2015 Twin Cities Metro Region

7 Pelican Prairie Lizzie Pelican River Watershed Discharge (2015 summer average) Infested lakes upstream Focal downstream water bodies Distance downstream Otter Tail Co. 1,249,541 acres (Otter Tail) 123 cfs (upper), 218 cfs (lower) 6864 acres Otter Tail River, Reservoirs 80 km 10 km

8 Downstream from Gull and Pine Rivers: 230 km (143 mi) of Mississippi River with patchy zebra mussel populations

9 Minnehaha Creek Watershed Discharge (2015 summer average) Infested lake upstream Focal downstream water body Distance downstream Hennepin Co. 115,840 acres 34 cfs 14,205 acres Lakes Hiawatha, Nokomis 32 km

10 Downstream drift studies in Minnesota Samples, at increasing distances downstream from the infested lake, ending near the inlet: Settlement of juvenile mussels; reproductive season (June-October) Veliger concentrations (June- October); 150 L water pumped and 50-micron filtered

11 Cinder block samplers for settlement Pelican Brook below Lake Ossawinamakee, 06/24/2015. Photos by Dan Swanson

12 Settlement in streams is highly localized near the upstream lake

13 Settlement in streams is highly localized near the upstream lake

14 Settlement in streams is highly localized near the upstream lake

15 Settlement in streams is highly localized near the upstream lake

16 Source lake Destination lake The scenario for spread down streams, often assumed

17 Source lake Destination lake

18 Source lake Destination lake

19 Source lake Destination lake

20 Source lake Destination lake

21 Source lake Destination lake Is incorrect

22 Source lake Destination lake This is closer to correct

23 Veliger pump-sampling, Gray s Bay Dam, Minnehaha Creek 06/16/2015 Stream discharge measurement, Pelican River 06/11/2015

24

25 Estimating veliger supply to sites downstream Concentration (veligers/l) from counts is not sufficient Flux numbers of larvae flowing past a stream cross section per unit time Considers stream discharge Flux = (veligers/liter)(liters/sec) = veligers/sec

26 Pelican 1 Lizzie 3 Prairie 4 5 Site Distance (km) km Otter Tail River 80.2 Red River 152

27 Veligers, Pelican River 2015

28 Veligers decline downstream in all cases; strong seasonality Site Month Comparison of slopes Regression Coefficent F (regression) Gull River (2014) July July = August * Gull River (2014) August ** Pine River June June < (July = August) * Pine River July ** Pine River August ** Minnehaha Creek June June < July < August *** Minnehaha Creek July *** Minnehaha Creek August *** Pelican River June June < July *** Pelican River July *** Pelican River August ns

29 Veliger transport to downstream water bodies River Year Month Observed at downstream inlet Predicted* from regression Veligers/da Lower Upper y % decline km to inlet km to 0 95% 95% r 2 Gull 2014 July 2.50 x Gull 2014 August Minnehaha 2015 June 1.74 x Minnehaha 2015 July Minnehaha 2015 August Pine 2015 June 1.04 x Pine 2015 July 6.64 x Pine 2015 August 1.15 x Pelican 2015 June 1.01 x Pelican 2015 July 1.23 x Pelican 2015 August 3.48 x Threat High Moderate Zero *2-parameter exponential

30 Zebra mussel veliger larvae Possible causes of loss during downstream transport Starvation, predation Abiotic factors exceed tolerance limits Settlement in poor habitat Physical removal: e.g. flow through wetlands Turbulence

31 Conclusions Settlement of zebra mussels occurs only a short distance downstream of source lakes In small streams (< ~30 ft wide) Adult populations will not become established far downstream of source water bodies Limits threat e.g. to freshwater mussel populations

32 Conclusions Substantial, highly seasonal threat of spread to connected waterways Extensive (largely unexplained) variation in veliger concentration leaving lake outlets Strong decline with distance why?

33 Some future research needs Determination of survival of larvae as they travel downstream Research on stream reproductive ecology, lake colonization biology Spread forecasts that consider both overland and waterway connections

34 Population genetics: pathways of zebra mussel spread Sampling of infested waterbodies in locations - 19 waterbodies 1281 individuals Dr. Sophie Mallez Genotyping of every individual at 9 microsatellite markers Repeated, short DNA sequence motifs GTTAGTCCAGAGAG.AGAGAGTTCGATCT Optimized so that several markers can be screened at once

35 Population genetics: pathways of zebra mussel spread Genetic Structure Significant differentiation between several locations Fst from to Mean = Well-defined clusters distinguish important lake infestations (Mille Lacs, Prior, Carlos)

36 Population genetics: pathways of zebra mussel spread Testing of invasion pathways Approximate Bayesian Computation (ABC...) Simulation of datasets under competing invasion scenarios Selection of the most likely scenario based on posterior probabilities Undergoing analysis but initial results

37 Population genetics: pathways of zebra mussel spread Mille Lacs Lake A source for inland lakes? Pr.>0.85 Independent-introduction scenario selected in nearly all cases (posterior probabilities from 0.86 to 0.99) Results robust to changes in priors and samples Mille Lacs Lake is not identified as a source

38 Understanding the pattern of spread of zebra mussel in Minnesota Scenario Comparisons Prior Lake Secondary source for inland lakes? Pr.>0.90 Independent introductions scenario selected in all cases (posterior probabilities from 0.92 to 0.99) Results robust to changes in priors and samples Prior Lake is not identified as a source

39 Understanding the pattern of spread of zebra mussel in Minnesota Alexandria-area lakes Carlos and LeHomme Dieu Successive introductions selected LeHomme Dieu Lake (or Lake Carlos) and Lake Darling Independent introductions selected Stepping-stone scenario alone cannot account for this clustered invasion

40 Invasion genetic results: what do they mean? Questions contributions of superspreader lakes Relax watercraft inspections on these lakes? No! In fact, prevention may have reduced spread from them What are the major sources? Mississippi and St. Croix River continue to be good candidates Genomic analysis will give us much greater power to find out

41 Thanks UMN Grace Van Susteren, Sarah Peterson, Sendrea Best, Peter Xiong, Max Kleinhaus (field and lab assistants); Kenneth Beckmann and the UMN Genomics Center RMB Labs Moriya Rufer for discharge data, help and advice in the Pelican River Watershed MnDNR Keegan Lund, Mark Ranweiler, Dan Swanson, Rich Rezanka for field support throughout MN, Gary Montz for advice, help, and archived samples, Joshua Prososki for discharge data on the lower Pelican River USACE Corrine Hodapp for discharge data on the Pine River Clean Water Fund, ENRTF, Gull Chain of Lakes Association, Pelican Lakes Association for funding

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