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Earth Science | Oceans | Coastal Processes | Mangroves

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  • Data were collected on stable isotope ratios and decomposition of mangrove and seagrass leaves set 'in situ' among the mangrove forest and seagrass beds, respectively, in the Weipa region in 1993/94. The leaf material were set in porous bags intertidally and subtidally. Two experiments, one beginning in June 1993 (dry season), and one beginning in December 1993 (wet season) were conducted. Successive bags were harvested after about 4-8 days, then they were harvested every two months for 10 months and four months (respectively). Data were also collected on litterfall from mangrove trees in three mangrove communities; Rhizophora, Avicennia and Ceriops. Litter traps were set at two sites in each community in March 1993 and harvested every two months for 10 months. These data may only have been stored in EXCEL files and may be lost, though a paper was published on the results of the experiments (see Conacher et al, 1996).

  • During October to December 1997, estuarine habitats in the Joseph Bonaparte Gulf (JBG) were beam trawled to determine the distribution of juvenile red-legged banana prawns, Penaeus indicus (H. Milne Edwards, 1837) and white banana prawns, Penaeus merguiensis (de Mann, 1888). In total 229 beam-trawls at 185 sites were performed, mostly over a 100 m path (3 min duration) between Pearce Point (north of the Victoria River) and just west of the King George River (including Cambridge Gulf). A Global Positioning System (GPS) receiver was used to verify site location. During October to December 1998, three of the rivers that were sampled in 1997 were intensively re-sampled to confirm the gulf-wide distribution of P. indicus and P. merguiensis and to investigate the microhabitat use of P. indicus. Sample sites were chosen from previously-sampled and new sites in Forsyth Creek (eastern Joseph Bonaparte Gulf), the Lyne River (Cambridge Gulf), and the Berkeley River (western Joseph Bonaparte Gulf). A total of 249 trawls were done at 21 sites, mostly over 100 m. Salinity, temperature, secchi, tide and sediment samples were also collected.