No.01

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Abstract

¡@¡@Mangroves were intentionally and massively planted in the Xiangshan Wetlands in1998.  In 2009, most high tide areas were occupied by dense mangroves forest in the Xiangshan Wetlands.  The mature seeds falling period, pen-shaped seedlings of Kandelia obovata and seeds of Avicennia marina were drifting far away by monsoon and tides.  North of KeYa Water Recycling Center to south of TaChong Creek embankment, the alongshore was covered by mangrove forest.  This area is also the most important proliferation source for both species of mangrove tree in the Xiangshan Wetlands.  If mangrove trees expanding continuously, intertidal zone nearby will gradually become mangrove swamps.  After that, the habitat diversity will decrease as the mangrove forest growth.  Under mangrove forest, many crabs, shellfish, and polychaetes, will disappear as habitat diversity decrease. This important feeding habitat for migratory birds also will disappear. For the conservation of the biodiversity, it is crucial to remove some of mangrove from the Xiangshan Wetlands.  SOWH (Society of Wildness, HsinCHu) is in charge of mangrove removal at the area of Sanxing Creek estuary, and the south-west of embankment of KeYa Water Recycling Center in 2009.  From July 15 to Oct. 30, 2009, a total of 5 hectares mangrove forest had been cleaned up.  In the mean time, species composition and population density of crabs were monitored as an indicator to evaluate the effects of mangrove forest clear cutting.

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