Shore water pollution has increased prominently as the rapid development of agriculture and industry. Nine ponds in the mangrove plantation-aquaculture A, B and C systems were established. The results showed that algal abundance ranged from 10.5x10(5) to 3744.3x10(5) ind./L and had positive correlations with Chl a, DO, COD and TP (r=0.697, 0.302, 0.350, 0.276, respectively; p<0.01). Removal rates in mangrove Bruguiera gymnorhiza and Rhizophora stylosa for NH3-N, NO3-N, TN, PO4-P were 41.74%-88.43%. NH3-N and PO4-P were lowerd by 55.91%-75.31% in Aegiceras corniculatum. The system stability was enhanced after mangrove plantation by the indication of algal abundance and species composition. (C) 2012 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of International Organizing Committee for AOAIS-1

Carrying capacity is critical for the sustainable development of fishery. Based on the data obtained from bimonthly surveys during the period from October 2008 to August 2009,a trophic model of a mangrove planting-aquaculture coupling system was constructed by using the ECOPATH model with Ecosim software. Energy flows and ecological carrying capacity( ECC) of the coupling system were analyzed and evaluated. The results showed that the constructed ECOPATH model consists of 14 functional groups,with the trophic level ranging from 1.00 to 3.05. The geometric mean of the trophic transfer efficiencies was 6.9%,with 7.2% from detritus and 6.6% from primary producers within the system. The lower efficiencies were attributable to that most energy flows back to detritus,suggesting that the food web was more dependent on detritus than on primary producers to support fishery. The ecosystem attributes statistics:TPP/TR( total primary production / total respiration) was 8.021,together with low connectivity index (CI) being 0.243,Finn’s cycling index( FCI) being 0.26 and mean path length( MPL) being 2.139,indicating this system is at a development stage according to Odum’s theory. Furthermore,we estimated the carrying capacity for tilapia( Oreochromis niloticus),grass carp( Ctenopharyngodon idellus),silver carp( Hypophthalmichthys molitrix) and bighead carp( Aristichthys nobilis),which are the main cultured species in the system. The ECC was defined as the maximum biomass that a specified environment can support without significant change of major energy fluxes or structure of the food web. The ECC of tilapia,grass carp,silver carp and bighead carp culture should be 5.82 t/hm2,1.81 t/hm2,2.62 t/hm2 and 4.76 t/hm2,respectively in the system. Furthermore,the effects of uncertainty of input parameters and sensitivity analysis of the ECOPATH were also explored.

Four times of investigation concerning phytoplankton and N-and P nutrients were carried out in twelve plantation-aquaculture coupling ponds of mangrove in the Pearl River estuary.The results showed that single plantation or coupled plantation of four mangrove species Kandelia cande,Aegiceras corniculatum,Bruguiera gymnorrhiza,and Rhizophora stylosa could purify DIN and PO4-P to a certain extent,but algal abundance was still in eutrophication or super-eutrophication status in each pond.Using cluster and NMDS analyses,it was proved that mangrove could change the community structure,but it could not decrease the abundance and eutrophication of the algae in short period.The complex inner-mechanism relationship of mangrove with algae should be studied further.

Mangroves are the diverse communities of tropical to subtropical trees and shrubs growing in inter-tidal zone.This particular zone endows the mangrove plants the capability of resisting and reducing contamination.However,there are still controversies about whether natural mangrove forests can be utilized to treat wastewater.According to the types of constructed mangrove wetlands,they are classified into three groups,i.e.,simulated tide wetland system,constructed wetland wastewater treatment system,and integrated mangrove-aquiculture system.The first one simulates the tidal situation of true seashore;the second one resembles most of ordinary constructed wetlands;while the third one is the aquiculture pond planted with mangrove to remove organic matter and nutrients.Different types of the constructed wetlands are the evidences of the progress in research work,showing the gradual process from theory to practice.It is feasible and promising to use constructed mangrove wetlands for wastewater treatment.

Seagrass are endogen plants living in intertidal and subtidal zones develope a series of eco-physiological changes adaptive to submersed sea water environments.This paper reviewed seagrass photosynthesis that is impacted by factors such as light, temperature, inorganic carbon and salinity, of which light and inorganic carbon are the common restriction factors.Seagrass are capable of acquiring HCO-3 as a source of inorganic carbon because of the shortage of inorganic carbon in the seawater. Less available light radiation also restricts the rate of their photosynthesis. Global climate change and human activities would influence the succession of the seagrass beds through variation of environmental elements such as temperature and light etc.