Environment Waikato Technical Report 2009/13. The results showed that the concentrations of heavy metals at all sediment depths in the S. apetala site were significantly higher than that in K. obovata.The geo-accumulation index and potential ecological risk … Mangroves cover a wide latitudinal range in Australia and New Zealand, so it is difficult to summarize the potential synergistic effects of climate change stressors for the entire region. The report recommends several measures to conserve and restore mangroves. Our promise In Louisiana, for example, the effect of rising water is compounded by land sinking due to water removal and sediment compaction. Ju-Der Wei performed the experiments, approved the final draft. Few studies have investigated the negative biological effects of mangroves. thank you in advance for your patience and understanding. The results of the study indicated that surface sediments in the 2005 cleared mown site are similar in 2008 to those in the existing mangrove habitat, with over 50% mud present at both sites. In terms of preferred habitat, Uca arcuate prefers to appear in a wet environment. After mangrove removal, the species returned to their original habitats. J was smallest in September 2016 with a value of 0.77. After mangrove removal, species returned to their original habitats and noteworthy biological values significantly increased in the mangrove regions. On the tidal flats in the non-mangrove region, the crab species included Uca arcuata, Uca lacteal, Mictyris brevidactylus, and Macrophthalmus banzai, and the Bivalvia species included Laternula anatine, Meretrix lusoria, Cycladicama oblonga, Tellina jedonensis, Mactra veneriformis. Two hectares of mangrove vegetation were removed on this occasion; a subset of which was also mown with a tractor to remove seedlings and pneumatophores (above-ground breathing roots). With global losses already in excess of 50%, mangroves are being lost more rapidly than tropical rainforests. The fluctuations in monthly benthic density and the number of species are shown in Fig. The process of mechanical removal is divided into five steps: trenching, shoveling, digging, compacting, and healing. This study presents evidence to argue that mangrove removal benefits benthic organisms. “The rate of sea-level rise keeps going up,” says Geselbracht, who was not affiliated with the study. (2011) proved that NDVI and ground-based measurements are a positively related. The mangrove cricket, Apteronemobius asahinai, possesses both circatidal and circadian clocks, and simultaneously exhibits circatidal and circadian rhythms in its locomotor activity. In subtropical estuarine wetlands, fishes, crabs, gastropods, prawns, and other megafauna require mudflats to serve as critical habitats. 3. This area is also known as the Siangshan Wetland (Fig. “The rate of sea-level rise keeps going up,” says Geselbracht, who was not affiliated with the study. The crab species included Uca arcuata, Uca lacteal, and Helice formosensis. peatlands), freshwater streams and rivers. Generally, scholars think that natural coast habitats provide healthier ecosystems than those that are artificially constructed. Mangroves (Rhizophora spp. In 2001, Siangshan Wetland was officially named the Hsinchu City Coastal Wildlife Sanctuary. (Taiwan). These results showed that the benthic density and species change seasonally in Siangshan Wetland, decreasing in winter and spring and increasing in summer. In this project, the mangrove forest was divided into two dense regions and a scattered region; a mechanical removal method was applied in the dense regions and manual removal in the scattered region. 11 p. The number of species within the mangrove regions increased after mangrove removal. The area studied in this work extends from the Sanxing stream to the Haishan Fishing Port, all of which lie to the west of Hsinchu, Taiwan. Effects of mangrove removal on benthic organisms in the Siangshan Wetland in Hsinchu, Taiwan Introduction. The dominant benthic organisms obtain nutrients from various sources, including bacteria and algae; the effect of mangrove-derived nutrients on the food web may be local, with minimal exports of organic material to surrounding habitats (e.g., sandflats) (Alfaro et al., 2006). 1. Stokes, D. 2009: Assessment of Physical Changes after Mangrove Removal: Whangamata Harbour 2008. 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