Contents of heavy metals, polycyclic aromatic hydrocarbons (PA Hs), dichlorodiphenyltrichloroethanes (DDTs) and hexachlorcy- clohexanes (HCHs) in surface sediments from mangrove areas of the Leizhou Peninsula we...Contents of heavy metals, polycyclic aromatic hydrocarbons (PA Hs), dichlorodiphenyltrichloroethanes (DDTs) and hexachlorcy- clohexanes (HCHs) in surface sediments from mangrove areas of the Leizhou Peninsula were analyzed in July and November 2005. Risk assessment criteria applied by Long E R et al. (1995) and Long E D et al. (1995) (effects range low, ERL; effects range mean, ERM) of chemicals in sediments from the gulf or estuary were used to assess the potential ecological risks of heavy metals, PAHs, DDTs and HCHs to aquatic organisms in the studied area. The results indicated that the average contents of zinc, nickel, chromium, lead, copper, arsenic and mercury were (61.97 ± 55.87), (59.99 ± 39.01 ), (47.93 ± 28.37), (26.64± 13.00) , (23.45 ± 41.96), (9.32 ± 3.62), (0.14 ± 0.18) mg/kg in dry weight in the sediment samples col- lected from five studied sites in the Leizhou Peninsula, respectively. Cadmium was not calculated due to its content being below the detection limit ( 〈 0.3 mg,/kg). The average levels of Cr, Cu, Ni, Pb, Zn and Hg exceed their background values. The average contents of Ni were higher than ERM. The contents of PAHs in the sediments from the five studied sites were (79.78 ± 43.70) ng/g in dry weight, far lower than ERL(4 022 ng/g). The contents of DDE, DDD and DDTs in the sediments from five studied sites were (2.60 ± 4.68), ( 17.52 ± 27.25 ), (27.78 ± 46.64) ng/g in dry weight respectively, clearly higher than ERL, and the average contents of DDT were (7.66 ± 15.93) ng/g in dry weight, much higher than ERM. HCHs could be detected in the sediments only from Gaoqiao sampling site, with the average contents (0.07 ± 0.08) ng/g in dry weight.展开更多
The study aims to compare the differences of macrofauna communities of wetlands at 3-year-forest- age, 5-year-forest-age Sonneratia apetala artificial mangroves, 5-year-forest-age Kandelia candel ar- tificial mangrove...The study aims to compare the differences of macrofauna communities of wetlands at 3-year-forest- age, 5-year-forest-age Sonneratia apetala artificial mangroves, 5-year-forest-age Kandelia candel ar- tificial mangroves with the same restoration background, and the naked tidal flat in the Qi’ao Island Mangrove Nature Reserve of Zhuhai, Guangdong Province. The results show that there were signif- icant structural differences in macrofauna communities among four kinds of habitats. The increase of biomass and species diversity of macrofauna at 3-year-forest-age S. apetala artificial mangroves was obviously faster than that at 5-year-forest-age K. candel artificial mangroves whose average tree height was close to that of 3-year-forest-age S. apetala artificial mangroves. The BIOENV analysis shows that it was related to the rapid growth of S. apetala, which rapidly changed the light level and shading conditions in the forests. The 5-year-forest-age S. apetala artificial mangroves had lower macrofauna species diversity but higher density and biomass than K. candel artificial mangroves with the same forest age. This was due to the rapid changes of physical and chemical properties of habitat soil by the ecological restoration of S. apetala artificial mangroves as well as the changed food sources possibly caused by the leaf-litter of such non-indigenous mangrove species S. apetala. However, further survey should be conducted on whether there are any negative ecological impacts of large-scale cultivation of S. apetala on macrofauna communities, so as to evaluate correctly S. apetala’s role in the restoration of coastal mangrove ecosystems.展开更多
实验被设计暴露喂过滤器的瓣鳃类 Perna viridisto 不同的污染 Cd 的水环境以便比较 Cd 通过被积累的不同小径。结果证明贻贝能在时间的一个短时期通过海水,食物,沉积和推迟的粒子小径积累 Cd。贻贝“通过海水小径的 Cd 的举起到达最...实验被设计暴露喂过滤器的瓣鳃类 Perna viridisto 不同的污染 Cd 的水环境以便比较 Cd 通过被积累的不同小径。结果证明贻贝能在时间的一个短时期通过海水,食物,沉积和推迟的粒子小径积累 Cd。贻贝“通过海水小径的 Cd 的举起到达最高的集中比通过水藻和沉积小径大约 3 和 9 倍分别地在 7 d 以后。这显示通过海水的 theCd 累积是很有效的。结果也显示举起直接通过贻贝摄取的污染水藻,粒子或沉积是不太重要的什么时候与由通过海水小径的贻贝的 Cd 的举起相比。由海洋的瓣鳃类的简历累积的金属举起小径和机制也在这篇论文被讨论。展开更多
The Sonneratia apetala artificial mangroves in the intertidal zone of Da Wei Bay at Qi’ao Island of Zhu-hai, South China were chosen as the macrofauna succession plots while bare tidal flats of the same size were est...The Sonneratia apetala artificial mangroves in the intertidal zone of Da Wei Bay at Qi’ao Island of Zhu-hai, South China were chosen as the macrofauna succession plots while bare tidal flats of the same size were established as control plots in surrounding interference-free areas. Conventional change indicators of community structure, such as biomass and biodiversity, and indicators, such as exergy and specific exergy, which reflect the information change of overall communities, were used to analyze the succession of macro-fauna communities inS. apetala artificial mangroves. The similarities and differences in variation tendency of the different ecological indicators and their reflected ecological principles were compared. The results showed that from D-1 to D-1275 after plantingS. apetala, the biomass of the macrofauna communities first increased, which was then followed by an increase in the network relationship between the macrofauna communities (analysis of the Pielou evenness index and Shannon-Wiener diversity index). The system in-formation (specific exergy) increased the slowest. Between D-1460 and D-2370 after plantingS. apetala, there was a decrease in biomass, network structure, and system information in the succession plots. After the decrease in the system information (the specific exergy), there was a decline in the network relationships (Pielou evenness index and Shannon-Wiener diversity index). Biomass was the last indicator to decrease. The similarities and differences among the different ecological indicators varied during the succession pro-cess, which reflected the relativity and differences among the indicators. This study suggested that, although the species diversity index can be an effective indicator of two types of changes (network structure and system information), it was quite clear that species diversity measurement was not suitable for expressing the changes in biomass during the succession process. While exergy and specific exergy can provide useful information about the structural development of communities, they cannot identify the information state of the system. Therefore, when evaluating macrofaunal succession inS. apetala artificial mangrove wetlands, it would be better to apply a number of different ecological indicators, rather than just one single indicator.展开更多
The morphology, microstructure and demographic parameters of statolith of Sthenoteuthis oualaniensis were studied from 90 individuals captured in the central South China Sea in September and October, 2012. The marphol...The morphology, microstructure and demographic parameters of statolith of Sthenoteuthis oualaniensis were studied from 90 individuals captured in the central South China Sea in September and October, 2012. The marphologic results showed that the statolith has great lateral dome and wing dome, small dorsal dome, and long narrow rostrum dome. S. Oualaniensis could be divided into three populations by statolith morphology in the central South China Sea. Five most important featured parameters including total statolith length (TSL), wing length (WL), maximum width (MW) were described by logarithmic functions with mental length (ML) (P 〈 0.05 ) ; rostnnn length ( RSL), dorsolateral length (DLL) were described by linear functions with ML( P 〈 0.05 ). With the squid growth, the size of statolith gradually develops, while the ratio of each featured parameter to ML slowly decreases, the ratio of DLL, LDL, RSL and WL to TSL almost remain the same level, corresponding to 48.05%, 60.05%, 35.44%, 67.59%, and the ratio of LDL and WL to SL show little higher.展开更多
基金Zhang Hongda Science Research Fund of Sun Yat-sen Universitythe Young and Middle-aged Excellet Reacher's Research Fund of Guangdong Education Institute in China.
文摘Contents of heavy metals, polycyclic aromatic hydrocarbons (PA Hs), dichlorodiphenyltrichloroethanes (DDTs) and hexachlorcy- clohexanes (HCHs) in surface sediments from mangrove areas of the Leizhou Peninsula were analyzed in July and November 2005. Risk assessment criteria applied by Long E R et al. (1995) and Long E D et al. (1995) (effects range low, ERL; effects range mean, ERM) of chemicals in sediments from the gulf or estuary were used to assess the potential ecological risks of heavy metals, PAHs, DDTs and HCHs to aquatic organisms in the studied area. The results indicated that the average contents of zinc, nickel, chromium, lead, copper, arsenic and mercury were (61.97 ± 55.87), (59.99 ± 39.01 ), (47.93 ± 28.37), (26.64± 13.00) , (23.45 ± 41.96), (9.32 ± 3.62), (0.14 ± 0.18) mg/kg in dry weight in the sediment samples col- lected from five studied sites in the Leizhou Peninsula, respectively. Cadmium was not calculated due to its content being below the detection limit ( 〈 0.3 mg,/kg). The average levels of Cr, Cu, Ni, Pb, Zn and Hg exceed their background values. The average contents of Ni were higher than ERM. The contents of PAHs in the sediments from the five studied sites were (79.78 ± 43.70) ng/g in dry weight, far lower than ERL(4 022 ng/g). The contents of DDE, DDD and DDTs in the sediments from five studied sites were (2.60 ± 4.68), ( 17.52 ± 27.25 ), (27.78 ± 46.64) ng/g in dry weight respectively, clearly higher than ERL, and the average contents of DDT were (7.66 ± 15.93) ng/g in dry weight, much higher than ERM. HCHs could be detected in the sediments only from Gaoqiao sampling site, with the average contents (0.07 ± 0.08) ng/g in dry weight.
基金The Science and Technology Project of Guangdong under contract No. 2009B030600006National Science and Technology Support Program sub-topics under contract No. 2009BADB2B0401-02Appropriative Researching Fund for Professors and Doctors, Guangdong University of Education under contract No. 10ARF01
文摘The study aims to compare the differences of macrofauna communities of wetlands at 3-year-forest- age, 5-year-forest-age Sonneratia apetala artificial mangroves, 5-year-forest-age Kandelia candel ar- tificial mangroves with the same restoration background, and the naked tidal flat in the Qi’ao Island Mangrove Nature Reserve of Zhuhai, Guangdong Province. The results show that there were signif- icant structural differences in macrofauna communities among four kinds of habitats. The increase of biomass and species diversity of macrofauna at 3-year-forest-age S. apetala artificial mangroves was obviously faster than that at 5-year-forest-age K. candel artificial mangroves whose average tree height was close to that of 3-year-forest-age S. apetala artificial mangroves. The BIOENV analysis shows that it was related to the rapid growth of S. apetala, which rapidly changed the light level and shading conditions in the forests. The 5-year-forest-age S. apetala artificial mangroves had lower macrofauna species diversity but higher density and biomass than K. candel artificial mangroves with the same forest age. This was due to the rapid changes of physical and chemical properties of habitat soil by the ecological restoration of S. apetala artificial mangroves as well as the changed food sources possibly caused by the leaf-litter of such non-indigenous mangrove species S. apetala. However, further survey should be conducted on whether there are any negative ecological impacts of large-scale cultivation of S. apetala on macrofauna communities, so as to evaluate correctly S. apetala’s role in the restoration of coastal mangrove ecosystems.
文摘实验被设计暴露喂过滤器的瓣鳃类 Perna viridisto 不同的污染 Cd 的水环境以便比较 Cd 通过被积累的不同小径。结果证明贻贝能在时间的一个短时期通过海水,食物,沉积和推迟的粒子小径积累 Cd。贻贝“通过海水小径的 Cd 的举起到达最高的集中比通过水藻和沉积小径大约 3 和 9 倍分别地在 7 d 以后。这显示通过海水的 theCd 累积是很有效的。结果也显示举起直接通过贻贝摄取的污染水藻,粒子或沉积是不太重要的什么时候与由通过海水小径的贻贝的 Cd 的举起相比。由海洋的瓣鳃类的简历累积的金属举起小径和机制也在这篇论文被讨论。
基金The Science and Technology Project of Guangdong under contract No.2009B030600006the National Science and Technology Support Program sub-topics under contract No.2009BADB2B0401-02+2 种基金the Appropriative Researching Fund for Professors and Doctors,Guangdong University of Education under contract No.10ARF01the National Spark Plan of China under contract No.2013GA780019the Scientific Research Project of Guangdong University of Education under contract No.2013yjxm03
文摘The Sonneratia apetala artificial mangroves in the intertidal zone of Da Wei Bay at Qi’ao Island of Zhu-hai, South China were chosen as the macrofauna succession plots while bare tidal flats of the same size were established as control plots in surrounding interference-free areas. Conventional change indicators of community structure, such as biomass and biodiversity, and indicators, such as exergy and specific exergy, which reflect the information change of overall communities, were used to analyze the succession of macro-fauna communities inS. apetala artificial mangroves. The similarities and differences in variation tendency of the different ecological indicators and their reflected ecological principles were compared. The results showed that from D-1 to D-1275 after plantingS. apetala, the biomass of the macrofauna communities first increased, which was then followed by an increase in the network relationship between the macrofauna communities (analysis of the Pielou evenness index and Shannon-Wiener diversity index). The system in-formation (specific exergy) increased the slowest. Between D-1460 and D-2370 after plantingS. apetala, there was a decrease in biomass, network structure, and system information in the succession plots. After the decrease in the system information (the specific exergy), there was a decline in the network relationships (Pielou evenness index and Shannon-Wiener diversity index). Biomass was the last indicator to decrease. The similarities and differences among the different ecological indicators varied during the succession pro-cess, which reflected the relativity and differences among the indicators. This study suggested that, although the species diversity index can be an effective indicator of two types of changes (network structure and system information), it was quite clear that species diversity measurement was not suitable for expressing the changes in biomass during the succession process. While exergy and specific exergy can provide useful information about the structural development of communities, they cannot identify the information state of the system. Therefore, when evaluating macrofaunal succession inS. apetala artificial mangrove wetlands, it would be better to apply a number of different ecological indicators, rather than just one single indicator.
文摘The morphology, microstructure and demographic parameters of statolith of Sthenoteuthis oualaniensis were studied from 90 individuals captured in the central South China Sea in September and October, 2012. The marphologic results showed that the statolith has great lateral dome and wing dome, small dorsal dome, and long narrow rostrum dome. S. Oualaniensis could be divided into three populations by statolith morphology in the central South China Sea. Five most important featured parameters including total statolith length (TSL), wing length (WL), maximum width (MW) were described by logarithmic functions with mental length (ML) (P 〈 0.05 ) ; rostnnn length ( RSL), dorsolateral length (DLL) were described by linear functions with ML( P 〈 0.05 ). With the squid growth, the size of statolith gradually develops, while the ratio of each featured parameter to ML slowly decreases, the ratio of DLL, LDL, RSL and WL to TSL almost remain the same level, corresponding to 48.05%, 60.05%, 35.44%, 67.59%, and the ratio of LDL and WL to SL show little higher.