Diurnal and semi-diurnal tides in the Taiwan Strait and its adjacent areas are calculated by using a two-dimensional finite-difference model. Compared with data of more than 20 observation stations around the Taiwan S...Diurnal and semi-diurnal tides in the Taiwan Strait and its adjacent areas are calculated by using a two-dimensional finite-difference model. Compared with data of more than 20 observation stations around the Taiwan Strait, the model-produced results agree quite well with those of previous researches using observational data from coastal tidal gauge stations. According to the results, the co-tidal and co-range charts are given. Furthermore, the characteristics of 8 major tidal constituents have been uminated respectively. The result shows that： （1） The tide motion can be attributed to the interaction between the degenerative rotary tidal system in the north and the progressive tidal system in the south. （2） The southward and northward tidal waves of semi-diurnal tide converge in the middle of the Taiwan Strait while the diurnal tidal waves propagate southwestward through the Taiwan Strait and the Luzon Strait. （3） The maximum amplitude of semi-diurnal tides exists at the area between the Meizhou Bay and Xinghua Bay, and that of diurnal tides appears in the region to the east of the Leizhou Peninsula, （4） The patterns of co-tidal and co-range charts of N2, K2 and P1, Q1 tidal constituents are similar to those of M2, S2 and K1 O1 tidat constituents, respectively展开更多
Length-frequency data of eight commercial fish species in the Beibu Gulf （Golf of Tonkin）, northern South China Sea, were collected during 2006-2007. Length-weight relationships and growth and mortality parameters w...Length-frequency data of eight commercial fish species in the Beibu Gulf （Golf of Tonkin）, northern South China Sea, were collected during 2006-2007. Length-weight relationships and growth and mortality parameters were analyzed using FiSAT II software. Five species had isometric growth, two species had negative allometric growth, and one species had positive allometric growth. Overall, the exploitation rates of the eight species were lower in 2006 2007 than in 1997-1999： for four species （Saurida tumbil, Saurida undosquamis, Argyrosomus macrocephalus, and Nemipterus virgatus） it was lower in 2006-2007 than in 1997 1999, for two species （Parargyrops edita and Trichiurus haumela） it remained the same, and for the other two species （Trachurus japonicus and Decapterus maruadsi） it was higher in 2006~007 than in 1997-1999. The exploitation rates might have declined because of the decline in fishing intensity caused by high crude oil prices. The optimum exploitation rate, estimated using Beverton-Holt dynamic pool models, indicated that although fishes in the Beibu Gulf could sustain high exploitation rates, the under-size fishes at first capture resulted in low yields. To increase the yield per recruitment, it is more effective to increase the size at first capture than to control fishing effort.展开更多
A survey on the hyperbenthic communities was carried out in the coastal waters of Sishili Bay in the Yellow Sea in July 2009,to investigate the impact of putative anthropogenic activities related to the presence of a ...A survey on the hyperbenthic communities was carried out in the coastal waters of Sishili Bay in the Yellow Sea in July 2009,to investigate the impact of putative anthropogenic activities related to the presence of a sewage outfall,a harbor and an aquaculture site on the benthic ecosystem.An Agassiz net trawl was used to collect hyperbenthos at 10 sampling stations.Species,diversity,abundance,and biomass were analyzed against water sample data and historical data obtained from records from nearby Yantai City.Fifty-two species were identified in the region,of which Crustacea were the most abundant taxon,followed by Echinodermata.Dominant species included five crustaceans,two echinoderms,one mollusk and one fish species.The results of a BIOENV analysis show that the concentrations of NO3-N and Chl-a were slightly positively correlated with hyperbenthic community structure,while other factors were negatively correlated,including sediment grain size and the percentage of TN and TOC in sediment.Abundance- Biomass Comparison(ABC method) curves indicate that the hyperbenthos in Sishili Bay had been disturbed by putative sources of human activities.Eight out of 10 stations were classified as "moderately perturbed" to "perturbed".展开更多
We collected leiognathid fishes from the Hainan Island and Beibu Gulf between November 2007 and December 2008.Ten of these specimens were identified as Nuchequula blochii (Valenciennes 1835),which is the first record ...We collected leiognathid fishes from the Hainan Island and Beibu Gulf between November 2007 and December 2008.Ten of these specimens were identified as Nuchequula blochii (Valenciennes 1835),which is the first record of this species in China's waters.These specimens are distinguished by the combination of these characteristics:breast fully scaled,cheek naked,anteroventral profile of the lower jaw almost straight,a conspicuous dark blotch distally on the anterior part of spinous portion of dorsal fin,a yellow blotch distally on posterior part of spinous portion of dorsal fin,and a dark blotch on nape.This paper reviews the genus Nuchequula and describes three species that occur in China's waters.展开更多
The whole metazoan community inhabiting Laizhou Bay and adjacent Bohai Sea waters were sampled in late autumn, 2006. Secondary production estimates for macrofauna and meiofauna were made separately. Total benthic seco...The whole metazoan community inhabiting Laizhou Bay and adjacent Bohai Sea waters were sampled in late autumn, 2006. Secondary production estimates for macrofauna and meiofauna were made separately. Total benthic secondary production was as high as 8.38 ±4.08 g ash-free dry weight （AFDW） m^-2 a^-1, which represented the autumn production level. In general, macrofaunal secondary production in Laizhou Bay was much lower than that in adjacent Bohai Sea areas. In contrast, meiofaunal secondary production in Laizhou Bay was higher than that in adjacent Bohai Sea areas. Macrofatma contributed 61% to benthic secondary production （5.09 ±3.26 g AFDW m^-2 a^-1）, lower than the value in previous studies in Bohai Sea. Sediment granulometric characteristics and bottom-water salinity could explain the substantial variability in the macrofauna biomass and production. Meiofaunal production was an important component of benthic production and exceeded macrofauna production under exceptional conditions, e.g. in Laizhou Bay, where macrofauna was restricted. Chlorophyll pigments （Chl-a） concentrations in sediment explained the general meiofaunal biomass and production distribution here.展开更多
基金supported by the National Natural Science Foundation of China under contract Nos. 40576015, 40810069004 and 40821063by the key research project of Fujian Province under contract No. 2004N203by the Fujian demonstrating region of the "863" Project of the Ministry of Science and Technology of China
文摘Diurnal and semi-diurnal tides in the Taiwan Strait and its adjacent areas are calculated by using a two-dimensional finite-difference model. Compared with data of more than 20 observation stations around the Taiwan Strait, the model-produced results agree quite well with those of previous researches using observational data from coastal tidal gauge stations. According to the results, the co-tidal and co-range charts are given. Furthermore, the characteristics of 8 major tidal constituents have been uminated respectively. The result shows that： （1） The tide motion can be attributed to the interaction between the degenerative rotary tidal system in the north and the progressive tidal system in the south. （2） The southward and northward tidal waves of semi-diurnal tide converge in the middle of the Taiwan Strait while the diurnal tidal waves propagate southwestward through the Taiwan Strait and the Luzon Strait. （3） The maximum amplitude of semi-diurnal tides exists at the area between the Meizhou Bay and Xinghua Bay, and that of diurnal tides appears in the region to the east of the Leizhou Peninsula, （4） The patterns of co-tidal and co-range charts of N2, K2 and P1, Q1 tidal constituents are similar to those of M2, S2 and K1 O1 tidat constituents, respectively
基金Supported by the Chinese Ministry of Agriculture under the Investigation of Fishery Stocks in China Seas Program (No. 070404)the Special Project of the Social Commonwealth Research National Institute (Nos.2009TS08, 2010YD10)
文摘Length-frequency data of eight commercial fish species in the Beibu Gulf （Golf of Tonkin）, northern South China Sea, were collected during 2006-2007. Length-weight relationships and growth and mortality parameters were analyzed using FiSAT II software. Five species had isometric growth, two species had negative allometric growth, and one species had positive allometric growth. Overall, the exploitation rates of the eight species were lower in 2006 2007 than in 1997-1999： for four species （Saurida tumbil, Saurida undosquamis, Argyrosomus macrocephalus, and Nemipterus virgatus） it was lower in 2006-2007 than in 1997 1999, for two species （Parargyrops edita and Trichiurus haumela） it remained the same, and for the other two species （Trachurus japonicus and Decapterus maruadsi） it was higher in 2006~007 than in 1997-1999. The exploitation rates might have declined because of the decline in fishing intensity caused by high crude oil prices. The optimum exploitation rate, estimated using Beverton-Holt dynamic pool models, indicated that although fishes in the Beibu Gulf could sustain high exploitation rates, the under-size fishes at first capture resulted in low yields. To increase the yield per recruitment, it is more effective to increase the size at first capture than to control fishing effort.
基金Supported by the Knowledge Innovation Program of Chinese Academy of Sciences(No.KZCX2-YW-Q07-04)the National Natural Science Foundation of China(No.NSFC41061130543)the Science and Technology Planning Project of Shandong Province(No.2011GGF01003)
文摘A survey on the hyperbenthic communities was carried out in the coastal waters of Sishili Bay in the Yellow Sea in July 2009,to investigate the impact of putative anthropogenic activities related to the presence of a sewage outfall,a harbor and an aquaculture site on the benthic ecosystem.An Agassiz net trawl was used to collect hyperbenthos at 10 sampling stations.Species,diversity,abundance,and biomass were analyzed against water sample data and historical data obtained from records from nearby Yantai City.Fifty-two species were identified in the region,of which Crustacea were the most abundant taxon,followed by Echinodermata.Dominant species included five crustaceans,two echinoderms,one mollusk and one fish species.The results of a BIOENV analysis show that the concentrations of NO3-N and Chl-a were slightly positively correlated with hyperbenthic community structure,while other factors were negatively correlated,including sediment grain size and the percentage of TN and TOC in sediment.Abundance- Biomass Comparison(ABC method) curves indicate that the hyperbenthos in Sishili Bay had been disturbed by putative sources of human activities.Eight out of 10 stations were classified as "moderately perturbed" to "perturbed".
基金Supported by the National Natural Science Foundation of China (Nos.30970317 and 41006084)Scientific Research Foundation for Guangdong Ocean University (No. 0912173)Special Foundation for Introduction Talent of Educational Commission of Guangdong Province (No. 0909128)
文摘We collected leiognathid fishes from the Hainan Island and Beibu Gulf between November 2007 and December 2008.Ten of these specimens were identified as Nuchequula blochii (Valenciennes 1835),which is the first record of this species in China's waters.These specimens are distinguished by the combination of these characteristics:breast fully scaled,cheek naked,anteroventral profile of the lower jaw almost straight,a conspicuous dark blotch distally on the anterior part of spinous portion of dorsal fin,a yellow blotch distally on posterior part of spinous portion of dorsal fin,and a dark blotch on nape.This paper reviews the genus Nuchequula and describes three species that occur in China's waters.
基金supported by the National Natural Science Foundation of China (Nos 40730847, 40906063)
文摘The whole metazoan community inhabiting Laizhou Bay and adjacent Bohai Sea waters were sampled in late autumn, 2006. Secondary production estimates for macrofauna and meiofauna were made separately. Total benthic secondary production was as high as 8.38 ±4.08 g ash-free dry weight （AFDW） m^-2 a^-1, which represented the autumn production level. In general, macrofaunal secondary production in Laizhou Bay was much lower than that in adjacent Bohai Sea areas. In contrast, meiofaunal secondary production in Laizhou Bay was higher than that in adjacent Bohai Sea areas. Macrofatma contributed 61% to benthic secondary production （5.09 ±3.26 g AFDW m^-2 a^-1）, lower than the value in previous studies in Bohai Sea. Sediment granulometric characteristics and bottom-water salinity could explain the substantial variability in the macrofauna biomass and production. Meiofaunal production was an important component of benthic production and exceeded macrofauna production under exceptional conditions, e.g. in Laizhou Bay, where macrofauna was restricted. Chlorophyll pigments （Chl-a） concentrations in sediment explained the general meiofaunal biomass and production distribution here.
