Goulder, R. (2021) Pondweeds (Potamogetonaceae) in of Yorkshire and neighbouring counties. The Naturalist 146: 44 – 61.

Appendix 1. References to studies that give details of survey sites and dates

Canals surveyed References Canal Goulder (2019a) Beverley Beck Goulder (2019a) and unpublished1 Calder & Hebble Navigation Goulder (2015, 2019a) and unpublished2 , Derbyshire Goulder (2014a) and unpublished3 Chesterfield Canal, South Yorkshire & Goulder (2013, 2017a, 2019a) Nottinghamshire Cromford Canal, Derbyshire Goulder (2014a, 2017a) and unpublished4 Dearne & Dove Canal Goulder (2019a) Driffield Canal Goulder (2019b) Erewash Canal, Derbyshire & Nottinghamshire Goulder, unpublished5 Grantham Canal, Leicestershire Goulder (2017a) Huddersfield Broad Canal Goulder (2012, 2019a, 2020a), Goulder & Morphy (2013) Huddersfield Narrow Canal, Yorkshire Goulder (2012, 2019a), Goulder & Morphy (2013) Huddersfield Narrow Canal, Cheshire & Goulder (2016a) Lancashire Knottingley & Goole Canal Goulder (2017e, 2019a) Lancaster Canal, Cumbria & Lancashire Goulder (2020b) Leeds & Liverpool Canal, Yorkshire Goulder (2016a, b, 2019a) Goulder (2017c, 2019a) Goulder (2017e, 2019a) Pocklington Canal Goulder (2014b, 2017c, 2019a) Ripon Canal Goulder (2013, 2019a) Selby Canal Goulder (2014c, 2019a) South Yorkshire Navigations, Sheffield to Goulder (2017b, 2019a) Bramwith Stainforth & Keadby Canal, Yorkshire & Goulder (2017b, 2019a) Lincolnshire 1The most recent survey of Beverley Beck was in August 2019. 2On the Calder & Hebble Navigation the latest survey of the Dewsbury Arm (1.2km, 1 length), the canal from Thornhill Double Locks to Thornhill Flood Lock (c.2.3km, 1 length) and from Brighouse Bottom Lock to Sowerby Bridge (c.11km, 11 lengths) was in June-July 2019. 3During May-September 2013, six lengths along c.7km of restored but isolated canal between Chesterfield and Staveley were surveyed, plus 8 lengths along c.9.5km of largely derelict canal between Staveley and Norwood Tunnel. 4The stub end of the Cromford Canal northward from Langley Bridge Lock at Langley Mill (1 length, c.0.4km) was surveyed in August 2017. 5The Erewash Canal from Langley Bridge Lock southward for c.2.7km (4 lengths) was surveyed in August-September 2017.