Research and analysis
The ecology of four scarce wetland molluscs
This study used a blend of large-scale surveys, small-scale surveys and field experiments to assess likely biotic and abiotic effects on distribution and abundance of scarce molluscs.
Ref: ISBN 1844320812, LIT 1545 PDF, 1.11MB, 217 pages
This file may not be suitable for users of assistive technology. Request an accessible format.
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email email@example.com. Please tell us what format you need. It will help us if you say what assistive technology you use.
In 1995, the United Kingdom (UK) Biodiversity Action Plan listed four wetland molluscs of Red Data Book status that required urgent conservation measures to prevent further reduction in their distribution: Segmentina nitida (Muller 1774), Anisus vorticulus (Troschel 1834), Valvata macrostoma (Morch 1864) and Pisidium pseudosphaerium (Schlesch 1947). All four typically occur in drainage ditches of large lowland grazing marshes of southern Britain and have shown marked decline in range, particular Segmentina nitida. However, despite their relative rarity, little is known of their ecological requirements, the reasons behind their decline, nor the management measures that might benefit their numbers. This study used a blend of large-scale surveys, small-scale surveys and field experiments to assess likely biotic and abiotic effects on distribution and abundance.