Oral Presentation Society for Freshwater Science 2025 Annual Meeting

Characterising the terrestrial-aqautic biodiveristy of winterbourne streams to inform the design of restoration schemes (117324)

Robert Collier 1 , Erika Whiteford 1 , Tim Sykes 2 , Judy England 2 , Rachel Stubbington 1
  1. School of Science and Technology, Nottingham Trent University, Nottingham, Nottinghamshire, England
  2. Environment Agency, Southampton, Hampshire, England

England’s ‘winterbourne’ streams are seasonally intermittent non-perennial streams, and host high habitat diversity and thus support high biodiversity, including both aquatic and terrestrial species.  Most have been altered by anthropogenic influences including abstraction, pollution and physical habitat modification, threatening their natural form, function and their biodiverse communities. As such, tailored restoration actions are needed to improve the ecological health of winterbournes. The core aim of our research is to evaluate how restoration alters the physical habitat diversity and biodiversity of winterbourne streams.  We compared the effects of specific restoration actions including, restoring a river’s natural course, removal of artificial structures, mob grazing and shade reduction on two winterbourne streams. We characterised aquatic macroinvertebrate biodiversity using kick and Surber methodology and we sampled terrestrial invertebrates using pitfall traps. ‘MoRPh’ (Modular River Physical habitat) surveys were used to assess physical habitats before and after restoration, during both wet and dry phases. This presentation will report the conditions and communities characterised before and after restoration.. There were no significant differences in taxa richness before and after restoration on either winterbourne. However, there were significant compositional differences before and after restoration on both winterbournes as well increases in the abundance of winterbourne specialists such as Nemoura lacustris (Plecoptera), Paraleptophlebia werneri (Ephemeroptera) and Metacnephia amphora (Diptera). Our ultimate goal is to inform the design of restoration schemes that enhance biodiversity within winterbourne streams.