Presentation Title

Community Composition and Seedling Recruitment at Mai Po Nature Reserve

Start Date

November 2016

End Date

November 2016

Location

HUB 302-#36

Type of Presentation

Poster

Abstract

Mai Po Nature Reserve in Hong Kong provides an interesting case study in ecosystem management, specifically in the management of mangrove forest. The reserve consists of twenty individual wetlands separated by bunds, these wetlands are known as Gei Wai. They have been modified from man-made fish/shrimp ponds to instead support migratory birds; being intermittently drained one at a time, on a two-week interval, November thru March for this purpose. We examined six Gei Wais that are managed under different circumstances; these circumstances are delineated primarily by differences in the salinity of their water. Of the six Gei Wais that we looked at two were freshwater and four were brackish. Another region, the intertidal functioned as the control as it still experiences natural tidal flushing and is also the least managed/built. Through the collection of data on plant cover/distribution, seedling recruitment, and light environment of three species (Acanthus ilicifolius, Aegiceras corniculatum, Kandelia obovata), a comparison can be made about which Gei Wai best supports mangroves. Cover was recorded along a 50 meter transects and every five meters a plot of two by two meters was taken to record seedling recruitment/plant distribution, this was done in three Gei Wais and in the intertidal region. Light environment was recorded with a AccuPar LP-80, with measurements taken of three individuals for each of the species in the seven areas. With this data several trends become evident; both Aegiceras corniculatum, Kandelia obovata have similar relative densities but in the freshwater Gei Wai Aegiceras corniculatum was more abundant. Aegiceras corniculatum in general prefers areas of lower light whereas Acanthus ilicifolius was more abundant in areas of greater light. In terms of seedling recruitment only two area had any, these being the intertidal region and one of the brackish Gei Wai.

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Nov 12th, 4:00 PM Nov 12th, 5:00 PM

Community Composition and Seedling Recruitment at Mai Po Nature Reserve

HUB 302-#36

Mai Po Nature Reserve in Hong Kong provides an interesting case study in ecosystem management, specifically in the management of mangrove forest. The reserve consists of twenty individual wetlands separated by bunds, these wetlands are known as Gei Wai. They have been modified from man-made fish/shrimp ponds to instead support migratory birds; being intermittently drained one at a time, on a two-week interval, November thru March for this purpose. We examined six Gei Wais that are managed under different circumstances; these circumstances are delineated primarily by differences in the salinity of their water. Of the six Gei Wais that we looked at two were freshwater and four were brackish. Another region, the intertidal functioned as the control as it still experiences natural tidal flushing and is also the least managed/built. Through the collection of data on plant cover/distribution, seedling recruitment, and light environment of three species (Acanthus ilicifolius, Aegiceras corniculatum, Kandelia obovata), a comparison can be made about which Gei Wai best supports mangroves. Cover was recorded along a 50 meter transects and every five meters a plot of two by two meters was taken to record seedling recruitment/plant distribution, this was done in three Gei Wais and in the intertidal region. Light environment was recorded with a AccuPar LP-80, with measurements taken of three individuals for each of the species in the seven areas. With this data several trends become evident; both Aegiceras corniculatum, Kandelia obovata have similar relative densities but in the freshwater Gei Wai Aegiceras corniculatum was more abundant. Aegiceras corniculatum in general prefers areas of lower light whereas Acanthus ilicifolius was more abundant in areas of greater light. In terms of seedling recruitment only two area had any, these being the intertidal region and one of the brackish Gei Wai.