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Composition and relative health of remnant vegetation fringing lakes along a salinity and waterlogging gradient

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Abstract

Extensive land clearing for agriculture in south-west Western Australia has led to highly fragmented patches of remnant vegetation. In this landscape, the fringing vegetation of lakes has an important conservation priority in a biologically diverse region but is vulnerable to altered hydrological regimes and easily degraded by waterlogging and salinity. Protection of the fringing vegetation with direct intervention approaches such as drainage or pumping schemes requires knowledge of the tolerance or ‘coping’ range of species targeted for conservation. To obtain this information the health of vegetation in relation to waterlogging and salinity is assessed in two lake systems north of Esperance in south-western Australia. The lower reaches of both systems are dominated by healthy halophytic species. Mesophytes, phreatophytes, xerophytes, and combinations of these classes dominate the upper reaches but are mostly degraded. There are unhealthy and healthy pockets of mesophytic, phreatophytic, xerophytic species, and combinations of these classes occurring at similar elevations above shallow groundwater, indicating that temporal hydroperiod thresholds are important for these species.

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Acknowledgments

This research was supported by the Department of Environment and Conservation (DEC), Water Corporation and the Centre for groundwater studies. We are grateful to Tilo Massenbauer, Daniel Winton and Nikki Cowcher of the DEC for providing logistic and field support. We thank Elizabeth Mattiske and Sarah Robinson from Mattiske Consulting Pty Ltd. for field support, taxonomical identification and analytical discussions. Thanks to Katie Hill, Dyah Kusumastuti and David Reynolds from School of Environmental Systems Engineering for field support.

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Correspondence to K. R. J. Smettem.

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Horsnell, T.K., Smettem, K.R.J., Reynolds, D.A. et al. Composition and relative health of remnant vegetation fringing lakes along a salinity and waterlogging gradient. Wetlands Ecol Manage 17, 489–502 (2009). https://doi.org/10.1007/s11273-008-9126-2

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  • DOI: https://doi.org/10.1007/s11273-008-9126-2

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