Signal crayfish burrowing, bank retreat and sediment supply to rivers: A biophysical sediment budget

Burrowing into riverbanks by animals transfers sediment directly into river channels and has been hypothesised to accelerate bank erosion and promote mass failure. A field monitoring study on two UK rivers invaded by signal crayfish (Pacifastacus leniusculus) assessed the impact of burrowing on bank erosion processes. Erosion pins were installed in 17 riverbanks across a gradient of crayfish burrow densities and monitored for 22 months. Bank retreat increased significantly with crayfish burrow density. At the bank scale (<6 m river length), high crayfish burrow densities were associated with accelerated bank retreat of up to 253% and more than a doubling of the area of bank collapse compared with banks without burrows. Direct sediment supply by burrowing activity contributed 0.2% and 0.6% of total sediment at the reach (1.1 km) and local bank (<6 m) scales. However, accelerated bank retreat caused by burrows contributed 12.2% and 29.8% of the total sediment supply at the reach and bank scales. Together, burrowing and the associated acceleration of retreat and collapse supplied an additional 25.4 t km−1 a−1 of floodplain sediments at one site, demonstrating the substantial impact that signal crayfish can have on fine sediment supply. For the first time, an empirical relation linking animal burrow characteristics to riverbank retreat is presented. The study adds to a small number of sediment budget studies that compare sediment fluxes driven by biotic and abiotic energy but is unique in isolating and measuring the substantial interactive effect of the acceleration of abiotic bank erosion facilitated by biotic activity. Biotic energy expended through burrowing represents an energy surcharge to the river system that can augment sediment erosion by geophysical mechanisms.

Albertson, L.K. & Allen, D.C. (2015) Meta-analysis: Abundance, behaviour, and hydraulic energy shape biotic effects on sediment transport in streams. Ecology, 96(5), 1329–1339. https://doi.org/10.1890/132138.1 Arce, J.A. & Dieguez-Uribeondo, J. (2015) Strucutral damage caused by the invasive crayfish Procambarus clarkii (Girard, 1852) in rice fields of the Iberian Peninsula: A study case. Fundamental and Applied Limnology, 186(3), 259–269. https://doi.org/10.1127/fal/ 2015/0715 Bai, S. & Lung, W.-S. (2005) Modelling sediment impact on the transport of fecal bacteria. Water Research, 39(20), 5232–5240. https://doi.org/ 10.1016/j.watres.2005.10.013 Barbaresi, S., Tricarico, E. & Gherardi, F. (2004) Factors inducing the intense burrowing activity by the red swamp crayfish, Procambarus clarkii, an invasive species. Naturwissenschaften, 91, 342–435. Belchier, M., Edsman, L., Sheehy, M.R.J. & Shelton, P.M.J. (1998) Estimating age and growth in long-lived temperate freshwater crayfish using lipofuscin. Freshwater Biology, 39(3), 439–446. https://doi.org/10. 1046/j.1365-2427.1998.00292.x Bilotta, G.S. & Brazier, R.E. (2008) Understanding the influence of suspended solids on water quality and aquatic biota. Water Research, 42(12), 2849–2861. https://doi.org/10.1016/j.watres.2008. 03.018 Bird, S., Hogan, D. & Schwab, J. (2010) Photogrammetric monitoring of small streams under a riparian forest canopy. Earth Surface Processes and Landforms, 35(8), 952–970. https://doi.org/10.1002/ esp.2001 Borgatti, L., Forte, E., Mocnik, A., Zambrini, R., Cervi, F., Martinucci, D. et al. (2017) Detection and characterization of animal burrows within river embankments by means of coupled remote sensing and geophysical techniques: Lessons from river Panaro (northern Italy). Engineering Geology, 226, 277–289. https://doi.org/10.1016/j.enggeo.2017. 06.017 British Geological Survey. (2020) Available at: www.bgs.ac.uk [Accessed 07 May 2020].
Butler, D.R. (1995) Zoogeomorphology: Animals as Geomorphic Agents. Cambridge: Cambridge University Press. https://doi.org/10.1017/ CBO9780511529900 Camici, S., Barbetta, S. & Moramarco, T. (2014) Levee body vulnerability to seepage: The case study of the levee failure along the Foenna stream on 1 January 2006 (Central Italy). Journal of Flood Risk Management, 10 (3), 314–325. Cooper, R.J., Outram, F.N. & Hiscock, K.M. (2016) Diel turbidity cycles in a headwater stream: Evidence of nocturnal bioturbation? Journal of Soils and Sediments, 16(6), 1815–1824. https://doi.org/10.1007/s11368016-1372-y Couper, P., Stott, T. & Maddock, I. (2002) Insights into river bank erosion processes derived from analysis of negative erosion-pin recordings: Observations from three recent UK studies. Earth Surface Processes and Landforms, 27(1), 59–79. https://doi.org/10.1002/esp.285 Darby, S.E., Alabyan, A.M. & van de Wiel, M.J. (2002) Numerical simulation of bank erosion and channel migration in meandering rivers. Water Resources Research, 38(9), 2-1-2-21. Environment Agency. (2020) Freshwater Fish Counts for all Species, all Areas, and all Years. Available at: https://data.gov.uk/dataset/ f49b8e4b-8673-498e-bead-98e6847831c6/freshwater-fish-countsfor-all-species-all-areas-and-all-years [Accessed 07 May 2020]. Faller, M., Harvey, G.L., Henshaw, A.J., Bertoldi, W., Bruno, M.C. & England, J. (2016) River bank burrowing by invasive crayfish: Spatial distribution, biophysical controls and biogemorphic significance. Science of the Total Environment, 569-570, 1190–1200. https://doi.org/ 10.1016/j.scitotenv.2016.06.194 Fei, S., Phillips, J. & Shouse, M. (2014) Biogeomorphic impacts of invasive species. Annual Review of Ecology, Evolution, and Systematics, 45(1), 69–87. https://doi.org/10.1146/annurev-ecolsys-120213-091928 Foucher, A., Salvador-Blanes, S.-B., Vandromme, R., Cerdan, O. & Desmet, M. (2017) Quantification of bank erosion in a drained agricultural lowland catchment. Hydrological Processes, 31(6), 1424–1437. https://doi.org/10.1002/hyp.11117 Fox, G.A., Wilson, G.V., Simon, A., Langedoen, E.J., Akay, O. & Fuchs, J.W. (2007) Measuring streambank erosion due to ground water seepage: Correlation to bank pore water pressure, precipitation and stream stage. Earth Surface Processes and Landforms, 32(10), 1558–1573. https://doi.org/10.1002/esp.1490 Fredlund, D.G., Morgenstern, N.R. & Widger, R.A. (1978) The shear strength of saturated soils. Canadian Geotechnical Journal, 15(3), 313–321. https://doi.org/10.1139/t78-029 Fredlund, D.G. & Rahardjo, H. (1993) Soil Mechanics of Unsaturated Soils. (Vol. 517). New York: Wiley. https://doi.org/10.1002/ 9780470172759 Guan, R.Z. (1994) Burrowing behaviour of signal crayfish, Pacifastacus leniusculus (Dana), in the river great Ouse, England. Freshwater Forum, 4, 155–168. Guan, R.Z. & Wiles, P. (1997) The home range of the signal crayfish in a British lowland river. In: Freshwater Forum. (Vol. 8, pp. 45–54). Harvey, G., Henshaw, A., Brasington, J. & England, J. (2019) Burrowing invasive species: And unquantified erosion risk at the aquaticterrestrial interface. Reviews of Geophysics, 57(3), 1018–1036. https:// doi.org/10.1029/2018RG000635 Harvey, G.L., Henshaw, A.J., Moorhouse, T.P., Clifford, N.J., Holah, H., Grey, J. et al. (2014) Invasive crayfish as drivers of fine sediment dynamics in rivers: Field and laboratory evidence. Earth Surface Processes and Landforms, 39(2), 259–271. https://doi.org/10.1002/ esp.3486 Harvey, G.L., Moorhouse, T.P., Clifford, N.J., Henshaw, A.J., Johnson, M.F., Macdonald, D.W. et al. (2011) Evaluating the role of invasive aquatic species as drivers of fine sediment-related river management problems: The case of the signal crayfish (Pacifastacus leniusculus). Progress in Physical Geography, 35(4), 517–533. https://doi.org/10.1177/ 0309133311409092
SANDERS ET AL. 15
Haussmann, N.S. (2017) Soil movement by burrowing mammals: A review comparing excavation size and rate to body mass of excavators. Progress in Physical Geography, 41(1), 29–45. https://doi.org/10.1177/ 0309133316662569 Iwasaki, T., Yamaguchi, S. & Yabe, H. (2018) Numerical simulation of bedload tracer transport associated with sand bar formation, bank erosion, and channel migration. E3S Web of Conferences, 40, 02013. https://doi.org/10.1051/e3sconf/20184002013 Jensen, D.W., Steel, E.A., Fullerton, A.H. & Pess, G.R. (2009) Impact of fine sediment on egg-to-fry survival of Pacific Salmon: A meta-analysis of published studies. Reviews in Fisheries Science, 17(3), 348–359. https:// doi.org/10.1080/10641260902716954 Johnson, M.F., Rice, S.P. & Reid, I. (2014) The activity of signal crayfish (Pacifastacus leniusculus) in relation to thermal and hydraulic dynamics of an alluvial stream, UK. Hydrobiologia, 724(1), 41–54. https://doi. org/10.1007/s10750-013-1708-1 Jones, J.I., Collins, A.L., Naden, P.S. & Sear, D.A. (2012) The relationship between fine sediment and macrophytes in rivers. River Research and Applications, 28(7), 1006–1018. https://doi.org/10.1002/rra.1486 Jugie, M., Gob, F., Virmoux, C., Brunstein, D., Tamisier, V., Le Coeur, C. et al. (2018) Characterizing and quantifying the discontinuous bank erosion of a small low energy river using structure-from-motion photogrammetry and erosion pins. Journal of Hydrology, 563, 418–434. https://doi.org/10.1016/j.jhydrol.2018.06.019 Kemp, P., Sear, D., Collins, A., Naden, P. & Jones, I. (2011) The impacts of fine sediment on riverine fish. Hydrological Processes, 25(11), 1800–1821. https://doi.org/10.1002/hyp.7940 Kronvang, B., Andersen, H.E., Larsen, S.E. & Audet, J. (2013) Importance of bank erosion for sediment input, storage and export at the catchment scale. Journal of Soils and Sediments, 13(1), 230–241. https://doi.org/ 10.1007/s11368-012-0597-7 Lane, S.N., Tayefi, V., Reid, S.C., Yu, D. & Hardy, R.J. (2007) Interactions between sediment delivery, channel change, climate change and flood risk in a temperate upland environment. Earth Surface Processes and Landforms, 32(3), 429–446. https://doi.org/10.1002/ esp.1404 Laubel, A., Kronvang, B., Hald, A.B. & Jensen, C. (2003) Hydromorphological and biological factors influencing sediment and phosphorus loss via bank erosion in small lowland rural streams in Denmark. Hydrological Processes, 17(17), 3443–3463. https://doi.org/ 10.1002/hyp.1302 Lawler, D.M., Grove, J.R., Couperthwaite, J.S. & Leeks, G.J.L. (1999) Downstream change in river bank erosion rates in the swale–Ouse system, northern England. Hydrological Processes, 13(7), 977–992. https://doi. org/10.1002/(SICI)1099-1085(199905)13:7<977::AID-HYP785>3.0. CO;2-5 Lisle, T.E. & Church, M. (2002) Sediment transport-storage relations for degrading, gravel bed channels. Water Resources Research, 38(11), 1219, 1–14. https://doi.org/10.1029/2001WR001086 Marston, R.A., Girel, J., Pautou, G., Piegay, H., Bravard, J.-P. & Arneson, C. (1995) Channel metamorphosis, floodplain disturbance and vegetation development, Ain River, France. Geomorphology, 13(1–4), 121–132. https://doi.org/10.1016/0169-555X(95)00066-E Micheletti, M., Chandler, J.H. & Lane, S.N. (2014) Investigating the geomorphological potential of freely available and accessible structurefrom-motion photogrammetry using a smartphone. Earth Surface Processes and Landforms, 40(4), 473–486. Moore, J.W. (2006) Animal ecosystem engineers in streams. Bioscience, 56 (3), 237–246. https://doi.org/10.1641/0006-3568(2006)056[0237: AEEIS]2.0.CO;2 Mutton, D. & Haque, C.E. (2004) Human vulnerability, dislocation and resettlement: Adaptation processes of river-bank erosion-induced displacees in Bangladesh. Disasters, 28(1), 41–62. https://doi.org/10. 1111/j.0361-3666.2004.00242.x
Nagata, N., Hosoda, T. & Muramoto, Y. (2000) Numerical analysis of river channel processes with bank erosion. Journal of Hydraulic Engineering, 126(4), 243–252. https://doi.org/10.1061/(ASCE)0733-9429(2000) 126:4(243) National Biodiversity Network. (2020) Available at: www.nbn.org.uk [Accessed 07 May 2020]. Onda, Y. & Itakura, N. (1997) An experimental study on the burrowing activity of river crabs on subsurface water movement and piping erosion. Geomorphology, 20(3-4), 279–288. https://doi.org/10.1016/ S0169-555X(97)00029-9 Orlandini, S., Moretti, G. & Albertson, J.D. (2015) Evidence of an emerging levee failure mechanism causing disastrous floods in Italy. Water Resources Research, 51(10), 7995–8011. https://doi.org/10.1002/ 2015WR017426 Palmer, J.A., Schilling, K.E., Isenhart, T.M., Schultz, R.C. & Tomer, M.D. (2014) Streambank erosion rates and loads within a single watershed: Bridging the gap between temporal and spatial scales. Geomorphology, 209, 66–78. https://doi.org/10.1016/j.geomorph.2013.11.027 Peay, S. (2001) Eradication of alien crayfish populations. Scott Wilson Resource Consultants. R&D Technical Report W1-037/TR1. Rice, S., Pledger, A., Toone, J. & Mathers, K. (2019) Zoogeomorphological behaviours in fish and the potential impact of benthic feeding on bed material mobility in fluvial landscapes. Earth Surface Processes and Landforms, 44(1), 54–66. https://doi.org/10.1002/esp.4541 Rice, S.P., Johnson, M.F., Extence, C., Reeds, J. & Longstaff, H. (2014) Diel patterns of suspended sediment flux and the zoogeomorphic agency of invasive crayfish. Cuadernos de Investigacion Geografica, 40(1), 7–27. https://doi.org/10.18172/cig.2508 Rice, S.P., Johnson, M.F., Mathers, K., Reeds, J. & Extence, C. (2016) The importance of biotic entrainment for base flow fluvial sediment transport. Journal of Geophysical Research - Earth Surface, 21(5), 890–906. Rice, S.P., Johnson, M.F. & Reid, I. (2012) Animals and the Geomorphology of Gravel-bed Rivers. In: Church, M., Biron, P. & Roy, A. (Eds.) Gravel Bed Rivers: Tools, Processes, Environments. Wiley-Blackwell, pp. 225–241. https://doi.org/10.1002/9781119952497.ch19 Saghaee, G., Mousa, A.A. & Meguid, M.A. (2017) Plausible failure mechanisms of wildlife-damaged earth levees: Insights from centrifuge modelling and numerical analysis. Canadian Geotechnics, 54(10), 1496–1509. https://doi.org/10.1139/cgj-2016-0484 Sanders, H. (2020) Biotic and abiotic controls of burrowing by signal crayfish (Pacifastacus leniusculus) and the implications for sediment recruitment to rivers. PhD Thesis, Loughborough University viewed 07 May 2020. Sear, D.A., Jones, J.I., Collins, A.L., Hulin, A., Burke, N., Bateman, S. et al. (2016) Does fine sediment source as well as quantify affect salmonid embryo mortality and development? Science of the Total Environment, 541, 957–968. https://doi.org/10.1016/j.scitotenv.2015. 09.155 Sibley, P. (2000) Signal crayfish management in the River Wreake catchment. In: Rogers, D. & Brickland, J. (Eds.) Crayfish Conference Leeds. pp. 84–96. Sidorchuk, A.Y. & Golosov, V.N. (2003) Erosion and sedimentation on the Russian plain, II: The history of erosion and sedimentation during the period of intensive agriculture. Hydrological Processes, 17(16), 3347–3358. https://doi.org/10.1002/hyp.1391 Simon, A. & Collison, A.J.C. (2001) Pore-water pressure effects on the detachment of cohesive streambeds: Seepage forces and matric suction. Earth Surface Processes and Landforms, 26(13), 1421–1442. https://doi.org/10.1002/esp.287 Sofia, G., Masin, R. & Tarolli, P. (2016) Prospects for crowdsourced information on the geomorphic ‘engineering’ by the invasive coypu (Myocastor coypus). Earth Surface Processes and Landforms, 42(2), 367–377.
16 SANDERS ET AL.
Soulsby, C., Youngson, A.F., Moir, H.J. & Malcolm, I.A. (2001) Fine sediment influence on salmonid spawning habitat in a lowland agricultural stream: A preliminary assessment. Science of the Total Environment, 265(1–3), 295–307. https://doi.org/10.1016/S00489697(00)00672-0 Stanton, J.A. (2004) Burrowing behaviour and movements of the signal crayfish Pacifastacus leniusculus (Dana). Thesis: University of Leicester, viewed 07 May 2020. Statzner, B. (2012) Geomorphic implications of engineering bed sediments by lotic animals. Geomorphology, 157-158, 49–65. https://doi.org/10. 1016/j.geomorph.2011.03.022 Suttle, K.B., Power, M.E., Levine, J.M. & McNeely, C. (2004) How fine sediment in riverbeds impairs growth and survival of juvenile salmonids. Ecological Applications, 14(4), 969–974. https://doi.org/10.1890/035190 Thorne, C.R. (1981) Field measurements of rates of bank erosion and bank material strength. In Erosion and Sediment Transport Measurement (Proceedings of the Florence Symposium, June 1981). IAHS Publication 133, International Association of Hydrological Sciences: Wallingford; pp. 503–512. Veihe, A., Jensen, N.H., Schiotz, I.G. & Nielsen, S.L. (2010) Magnitude and process of bank erosion at a small stream in Denmark. Hydrological Processes, 25(10), 1597–1613. Viero, D.P., D'Alpaos, A., Carniello, L. & Defina, A. (2013) Mathematical modelling of flooding due to river bank failure. Advances in Water Resources, 59, 82–94. https://doi.org/10.1016/j.advwatres.2013. 05.011 Vu, H.D., Wieski, K. & Pennings, S.C. (2017) Ecosystem engineers drive creek formation in salt marshes. Ecology, 98(1), 162–174. https://doi. org/10.1002/ecy.1628 West, R.J. (2010) Non-native crayfish: A new approach to trapping. A review of signal crayfish trapping on the River Lark at Barton Mills, Suffolk from 2001 to 2013. Lark Angling & Preservation Society. Wilkes, M.A., Gittins, J.R., Mathers, K.L., Mason, R., Casas-Mulet, R., Vanzo, D. et al. (2019) Physical and biological controls on fine sediment transport and storage in rivers. Wiley Interdisciplinary Reviews Water, 6(2), e1331. Wood, P.J. & Armitage, P.D. (1997) Biological effects of fine sediment in the lotic environment. Environmental Management, 21(2), 203–217. https://doi.org/10.1007/s002679900019
ADDED REFERENCES Chadwick, D.D.A. (2019) Invasion of the signal crayfish, Pacifastacus leniusculus, in England: implications for the conservation of the whiteclawed crayfish, Austropotamobius pallipes. PhD Thesis, University College London viewed 08 November 2020. Guan, R.Z. & Wiles, P.R. (1999) Growth and reproduction of the introduced crayfish Pacifastacus leniusculus in a British lowland river. Fisheries Research, 42(3), 245–259. https://doi.org/10.1016/S0165-7836 (99)00044-2 Henshaw, A.J., Thorne, C.R. & Clifford, N.J. (2013) Identifying causes and controls of river bank erosion in a British upland catchment. Catena, 100, 107–119. https://doi.org/10.1016/j.catena.2012.07.015 Holdich, D.M. (2000) The Development of Ecological Requirements to Inform the Production of Conservation Objectives for White-Clawed Crayfish. Peterborough: English Nature. Luppi, L., Rinaldi, M., Teruggi, L.B., Darby, S.E. & Nardi, L. (2009) Monitoring and numerical modelling of riverbank erosion processes: A case study along the Cecina River (Central Italy). Earth Surface Processes and Landforms, 34(4), 530–546. https://doi.org/10.1002/esp.1754 Pledger, A.G., Rice, S.P. & Millett, J. (2016) Bed disturbance via foraging fish increases bedload transport during subsequent high flows and is controlled by fish size and species. Geomorphology, 253, 83–93. https://doi.org/10.1016/j.geomorph.2015.09.021 Rinaldi, M. & Nardi, L. (2013) Modeling interactions between riverbank hydrology and mass failures. Journal of Hydrologic Engineering, 18 (10), 1231–1240. https://doi.org/10.1061/(ASCE)HE.1943-5584.0000716 Viles, H.A., Naylor, L.A., Carter, N.E.A. & Chaput, D. (2008) Biogeomorphological disturbance regimes: Progress in linking ecological and geomorphological systems. Earth Surface Processes and Landforms, 33(9), 1419–1435. https://doi.org/10.1002/esp.1717