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Zhang Z.,Huzhou Teachers College | Zhang Z.,Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio resource | Wang X.,Huzhou Teachers College | Mo X.,Huzhou Teachers College | Qi H.,Weifang Medical University
Carbohydrate Polymers | Year: 2013

Polysaccharide extracted from Enteromorpha linza possesses excellent antioxidant activities, but its molecular weight was greatly high which influences the activity. In this study, the combination of ascorbic acid and H2O2 was used as degradation reagents in order to obtain the lower molecular weight product. The results suggested that the most effective molar ratio of the two reagents was 1. Three degraded polysaccharides were selected to evaluate their antioxidant activities in vitro and characterized the relationship between antioxidant activity and chemical characteristics. It was found that the degraded sample with lower molecular weight possessed the higher antioxidant activities. © 2012 Elsevier Ltd. Source

Pan Y.,Zhejiang University | Zhai M.,Zhejiang University | Lin L.,Zhejiang University | Lin Y.,Zhejiang University | And 5 more authors.
Habitat International | Year: 2016

Islands, which deliver a diversity of fundamental services, are subject to increasing pressure from urbanization and human activities, particularly in developing countries. This paper integrates socioeconomic drivers, topographic variables, and policy guidance to characterize the spatiotemporal dynamics of urban expansion between 1980 and 2013 in the Zhoushan islands, China. Our results indicate that the Zhoushan islands experienced remarkable urban expansion and economic prosperity over that period, with a clear acceleration since 2000. The increase in built initially occurred in urban cores and then spread to peri-ocean areas over the last decade. These hotspots were the outcomes of co-occurrence of ports, harbors, and coastal industries or tourism establishments, suggesting a considerable disparity among islands with different functions. We further quantified the socioeconomic drivers of urban expansion using multivariable regression. Generally, the major drivers were secondary and tertiary industry growth because of the effect of governmental interventions and changing economic conditions on coastal industries and tourism development. Cross-sea bridges also served to accelerate island development, while population had a lesser impact. Compared with other successful cases worldwide, extensive development and inefficient land use are prevalent in the Zhoushan islands. Available land has become more rare on the islands and reclamation from the ocean has been increasingly applied to expand land area for construction. There are still large gaps in island sustainable development, suggesting that intensive and reasonable land-use planning should be prioritized over exploring the potential for urban development. The results of this study can inform ecological management, and provide a scientific case for urban development and contributed to sustainability of islands and coastal regions. © 2015 Elsevier Ltd. Source

Wu D.,Zhejiang University | Nie P.,Zhejiang University | Nie P.,Nanchang Hangkong University | He Y.,Zhejiang University | And 3 more authors.
International Journal of Food Properties | Year: 2013

Visible and shortwave-near-infrared spectroscopy was used to predict protein content in Spirulina powder. Three variable selection algorithms of partial least square based uninformative variable elimination, partial least square based genetic algorithm, and successive projections algorithm were analyzed. Results showed that it was necessary to operate partial least square based uninformative variable elimination before successive projections algorithm. Successive projections algorithm performed better than partial least square based genetic algorithm, because it had a better result and fewer selected variables. The results showed that partial least square based uninformative variable elimination-successive projections algorithm was a good hybrid algorithm for the multivariable selection, and it was feasible for using visible and shortwave-near-infrared spectroscopy to non-destructively estimate protein content in Spirulina powder. Copyright © 2013 Taylor & Francis Group, LLC. Source

Peng X.,Zhejiang Metallurgical Research Institute | Peng X.,Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio resource | Xie Q.,Zhejiang Metallurgical Research Institute | Xie Q.,Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio resource | And 9 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2011

The intertidal zone between the land and the sea was impacted seriously by all kinds of human activities. Influences of environment conditions and pollution can be shown by the macrozoobenthic community and species distributed in the intertidal zone. With rapid economic development and overexploiting, Yueqing Bay (a semi-enclosed bay) is seriously threaten by human activities; such as industrial and agricultural discharges, aquaculture ponds and land reclamation. Resultant effects are; 1) the landscapes of intertidal regions are damaged, 2) polluted water and sediments, and, 3) recession of the marcozoobenthic community. Five different stations were investigated in September 2006 and May 2007 to assess impacts of human activities on intertidal macrozoobenthic community distribution patterns in Yueqing Bay. One hundred and thirteen species were identified, including 40 species of molluscs, 25 of polychetes, 24 of carapace, 9 of echinoderm, and 15 others. The number of species fluctuated across seasons. The 81 species in Autumn exceeded the 68 species in Spring. However, the average macrozoobenthic biomass and inhabit density in spring were (91. 90 ±59. 14) g/m2 and (1541 ± 1261. 41) ind./m2, respectively; which were higher than those in Autumn; these being (29. 20 ± 22. 20)g/m2 and (201 ± 52. 97) ind. /m2, respectively. Dominant species were juveniles of Potamocorbula ustulata (Reeve), Moerella iridescens (Benson), Retusa (Coelophysis) boenensis (A. Adams), Assiminea latericea (H. et A. Adams) in Spring; and, Assiminea brevicula, MoereUa iridescens (Benson), Ilyoplax tansuiensis Sakai, Diopatra neapolitana (Delle Chiaje) in Autumn. The results indicate that the functional status of the macrozoobenthic community changes with seasons. The biodiversity index varied from 2.34 to 3.31, the average being 2. 85 ± 0.35. The index of Margalef's species richness was from 3.02 to 6.42, the average being 4.29 ± 1.10. The Pielou's evenness was from 0.46 to 0.73, the average being 0.62 ± 0.09. Upon analysis of the macrozoobenthic community structure by ABC curve, only the Huanghua section had not been affected in Spring. According to hierarchical clustering analysis and MDS diagrams, community stability is bad in Yueqing Bay. The community with more than 40% of similarity could be clustered into three groups; the first was all of the sections in Spring, the second was sections including Huwu, Ximen Island, Nantang and Wengyang in Autumn, and, the third is the Huanghua section in Autumn. The data analyzed by MDS were consistent with the results of the hierarchical clustering analysis. The above mentioned results show that the structure of macrozoobenthic community had suffered moderate disturbance with the consequence of poor stability in Yueqing Bay. Compared to previous research, biomass and density were significantly decreased, and the dominant species changed from large to small ones; such as Cyclina sinensis (Gmelin), Sinonovacula constricta (Lamarck) and Cultellus scalprum (Gould) being replaced by Retusa (Coelo])hysiss boenensis (A. Adams), Assiminea latericea H. et A. Adams, and Assiminea brevicula. Changed variety of the macrozoobenthic community from its original type to the secondary type reflects the adverse impact of human activities that include excessive exploitation, habitat degradation, coastal engineering and pond farming. Source

Tao J.,Chinese Academy of Sciences | Ai W.,Wenzhou Medical College | Ai W.,Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio resource | Gong Y.,Chinese Academy of Sciences | And 9 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2010

Fisheries acoustics methods have been applied in fisheries investigation and research for decades, which superiored in direct, effectual, economical and does not result in fish mortality in fish sampling. They have been used to acquire the in situ information, such as fish abundances, temporal-spatial distribution and behaviours. Nanxi River is a model stream and is plentiful in fishery resources in the southern part of Zhejiang Province, which is located near the Wenzhou city. The Reach located in Shatou town, Fuli village Shizhu village and Lixi village (Area I -IV) is the major fisheries area. More than 37 fish species had acquired in those areas from 2007 to 2009, with Zacco platypus as the dominant species. In present study, the acoustical fish abundance assessment was conducted in the four Reaches of Nanxi River using EY60 split-beam echosounder (200kHz, Simrad) in 4th and 5th October, 2008. In post processing analysis, the GIS model had been applied to analysis the fish spatial distribution pattern in Area I - III, using the interpolation method of inverse distance weighting (IDW). During such procedure, the survey areas were divided into numerous gridding cells by the grid size of about 30m × 10m in the Area I and Area II, and an grid size of about 10m × 10m in the Area III. The result showed that, the mean target strength of four investigation area is (-55.03 ± 5.44) dB, and the standard length of fishes are ranging from 3 to 10 cm, with the mean length of 7cm, according to the empirical measures of target strength. The deviation of the fish sizes in the four area are not significant (P > 0.05). The mean density of four survey area is 8. 87 ind. / 1000m3, with the 95% confidence interval ranging from 1. 66 ind. /1000m3 to 16.09 ind. /1000m3. The mean fish density of Area III is (20.06±9.34) ind. /1000m3, which is the highest fish density among these areas. The fish spatial distribution in each survey area are aggregated into plaque pattern, based on the GIS modeling. However, the fish distribution pattern of Area IV had not revealed in this study, for the zigzag transects of this area is not dense. As for the fish biomass, the four investigation area are all together possessed of 25 thousand fish individuals, the biomass of each survey area is 3971 ind., ll478ind., 6587ind., 2978ind. respectively, according to vectoring grid technique of fish density, and the volume of element grid. Source

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