Assessing impacts of habitat modification on a subtropical salt marsh: 20 years of monitoring |
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Authors: | Pat E R Dale |
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Institution: | (1) Griffith School of Environment, Griffith University, Nathan, QLD, 4111, Australia |
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Abstract: | The impacts of habitat modification for mosquito control by runnelling in a sub-tropical salt marsh in eastern Australia were
evaluated over 20 years (1985–2005) on a quarterly basis. Runnels are shallow channels that connect isolated pools to the
tidal inlet. Differences between the first month and the last were assessed as two snapshots in time and showed a similar
nature of change between the two times for treatment and controls, though these were significant only for substrate moisture
(higher in runnel samples) and salinity (lower in runnel samples). Over the whole 20 years the impacts at the Coomera site
were to reduce mosquito larval populations, with small magnitude impacts on the environment. These were, for the runnel samples
compared to controls: increased substrate moisture, lower substrate salinity, less dense and smaller Sporobolus and Sarcocornia, slightly lower and less saline water table and more crab holes. These differences reflected a similar direction of change
for both runnel and control samples, in all the variables observed and may be associated with regional land use or climate
or sea level changes. During the last 5 years substrate moisture was higher near runnels than controls and this may be a response
to drought conditions over this period. The modification has had no maintenance. |
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Keywords: | Aedes vigilax Habitat modification Impacts Mosquito control Salt marsh Runnel |
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