Study

Effects of seawater flooding on Orthoptera and the yellow meadow ant Lasius flavus during New Zealand pygmy weed Crassula helmsii eradication at Old Hall Marshes, Essex, England

  • Published source details Gardiner T. & Charlton P. (2012) Effects of seawater flooding on Orthoptera and the yellow meadow ant Lasius flavus during New Zealand pygmy weed Crassula helmsii eradication at Old Hall Marshes, Essex, England. Conservation Evidence, 9, 50-53.

Summary

Coastal grazing marsh was flooded with seawater in a successful attempt to eradicate New Zealand pygmy weed Crassula helmsii at Old Hall Marshes in 2006. The abundance of Orthoptera and the presence of yellow meadow ants Lasius flavus were broadly similar between the flooded grazing marsh and unflooded ground in 2011 indicating that inundation did not have a deleterious impact on these non-target terrestrial insects. Ant hills in areas of lower ground within the flooded area, which were fully inundated in 2006, had a lower occupancy rate (44%) than those on higher ground (94% occupied), suggesting that unflooded refuges may be important.

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