Authors: Dana Michalcová Joanne C Gilbert Clare S Lawson David J G Gowing Rob H Marrs
Publish Date: 2010/12/07
Volume: 212, Issue: 5, Pages: 879-888
Abstract
Developing a strategy for evidencebased conservation is often problematic where a given habitat is found on relatively few small sites Here we investigate the important environmental variables that control species αdiversity in wet mesotrophic grasslands in lowland England We analysed data on species richness and three soils variables from 10 mesotrophic grasslands to test the following hypothesis is species diversity related to these soil factors and if so which is the most important Generalised linear modelling was used to derive minimum adequate models of these relationships The analysis identified degree of waterlogging and its interaction with both soil available phosphorus and soil pH as significant Species diversity decreased with increasing waterlogging and available phosphorus If species richness is to be conserved in these mesotrophic grasslands it would be best done by maintaining low levels of waterlogging 0–1 m weeks and low available phosphorus concentrations 10 μg P g−1 However this approach may predicate against specialist wetland species Our results will help develop sound conservation strategies for these mesotrophic grasslands and points the way for further investigative researchWe thank DEFRA and the Wildfowl and Wetlands Trust for funding the data collection Kate Barber for helping with soil collection and analysis and Mike Prosser Hilary Wallace and Owen Mountford for assistance with the collecting the botanical data Dana Michalcová was supported by Institutional Research Plan MSM0021622416 Masaryk University Milan Chytrý made valuable comments on an early draft
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