A sedimentological, petrographic, and geochemical study of beach, dune, and river sands was carried out along the northwestern Gulf of Mexico. The main goal of this work is to show how beach and dune sands are control...A sedimentological, petrographic, and geochemical study of beach, dune, and river sands was carried out along the northwestern Gulf of Mexico. The main goal of this work is to show how beach and dune sands are controlled texturally, compositionally, and chemically by the nearby rivers for each beach location using a particle size analyser, a polarized microscope, a X-ray fluorescence and ICP mass spectrometer to obtain the following: grain-size values from one river (Carrizal River) are similar in range to their counterpart beach sands but not similar to the dune sands (Barra del Tordo). Rivers (Panuco and Carrizal) are compositionally controlling the quartz and feldspar contents of their counterpart beach and dune sands (i.e., Playa Miramar and Barra del Tordo). Rivers (Soto La Marina River) are directly influencing the composition of the beach sands (La Pesca) based upon the total quartz content, beach and dune sands. The concentration of magnetite grain fractions (Barra del Tordo beach and dune sands) is not under the influence of the nearby river (Carrizal River). In this case the compositional influence of beach and dune sands is related to sediment discharges by other fluvial systems, redistribution of the beach and dune sands along the coast and deflation/winnowing of light minerals. The Eu positive anomaly in the beach and dune sands from the three sites (i.e. Playa Miramar, Barra del Tordo, La Pesca) is linked to an increase in the P(plagioclase)/K(potash feldspar) ratio. The (La/Lu)cn highest ratio for river sands (Carrizal River) suggests quartz enrichment compared to their beach and dune sands counterparts. The (Gd/Yb)cn ratio for one river (i.e., Carrizal River) indicates that it is low in heavy rare earth elements. HREE compared to their beach and dune sands counterparts indicates less concentration of heavy minerals as potential carriers of HREE seawards.展开更多
Agrometeorology and agricultural statistics methods were used to analyze the cases of high temperature heat damage to crab breeding since 2008 in Hongze Lake Beach, finding that the high temperature heat damage was ma...Agrometeorology and agricultural statistics methods were used to analyze the cases of high temperature heat damage to crab breeding since 2008 in Hongze Lake Beach, finding that the high temperature heat damage was mainly under the comprehensive effects of the highest temperature, duration of high temperature weather, amount of precipitation and sunshine hours. Based on the function relation between the high temperature heat damage index and the influence factors, the linear model was used to describe the weight coefficient of each heat damage factor by using the synthesis correlation of multiple factors. The historical values of the influencing factors were used to make statistical calculation of the heat damage index model of crab culture in Hongze Lake Beach, which achieved good effects when applied in the meteorological operation of river crab culture.展开更多
Objective:To investigate the prevalence of Calodium hepaticum(C.hepaticum)in rodents and insectivores from Wuhan section of the Yangtze River in China,and to provide evidence for the prevention and treatment of hepati...Objective:To investigate the prevalence of Calodium hepaticum(C.hepaticum)in rodents and insectivores from Wuhan section of the Yangtze River in China,and to provide evidence for the prevention and treatment of hepatic Calodium infection.Methods:Rodents and insectivores were captured from three selected Yangtze River beaches using mousetraps.The three survey sites were divided into six areas according to natural conditions,with 60 mousetraps placed in each area.The liver lesions in the captured rodents were observed by the naked eye and the eggs in the liver tissue were observed by microscopic examination.Results:A total of 1080 mousetraps were placed,and 1075 mousetraps were retrieved,with the retrieve rate as 99.5%.A total of 101 Apodemus agrarius,12 Rattus norvegicus,and 9 Crocidura attenuata were caught.The average density of rodents and insectivores was 10.5%and 0.8%,respectively.DNA of egg nodules from infected rodents showed 98%similarity with that of C.hepaticum 18 S rRNA(LC425008.1).One Rattus norvegicus was infected with C.hepaticum,with an infection rate of 3.23%in the Erqi river beach;the other two beaches did not show the incidence of C.hepaticum.Conclusions:The monitoring of C.hepaticum in the Yangtze River beaches should be strengthened to reduce the risk of human C.hepaticum infection.展开更多
文摘A sedimentological, petrographic, and geochemical study of beach, dune, and river sands was carried out along the northwestern Gulf of Mexico. The main goal of this work is to show how beach and dune sands are controlled texturally, compositionally, and chemically by the nearby rivers for each beach location using a particle size analyser, a polarized microscope, a X-ray fluorescence and ICP mass spectrometer to obtain the following: grain-size values from one river (Carrizal River) are similar in range to their counterpart beach sands but not similar to the dune sands (Barra del Tordo). Rivers (Panuco and Carrizal) are compositionally controlling the quartz and feldspar contents of their counterpart beach and dune sands (i.e., Playa Miramar and Barra del Tordo). Rivers (Soto La Marina River) are directly influencing the composition of the beach sands (La Pesca) based upon the total quartz content, beach and dune sands. The concentration of magnetite grain fractions (Barra del Tordo beach and dune sands) is not under the influence of the nearby river (Carrizal River). In this case the compositional influence of beach and dune sands is related to sediment discharges by other fluvial systems, redistribution of the beach and dune sands along the coast and deflation/winnowing of light minerals. The Eu positive anomaly in the beach and dune sands from the three sites (i.e. Playa Miramar, Barra del Tordo, La Pesca) is linked to an increase in the P(plagioclase)/K(potash feldspar) ratio. The (La/Lu)cn highest ratio for river sands (Carrizal River) suggests quartz enrichment compared to their beach and dune sands counterparts. The (Gd/Yb)cn ratio for one river (i.e., Carrizal River) indicates that it is low in heavy rare earth elements. HREE compared to their beach and dune sands counterparts indicates less concentration of heavy minerals as potential carriers of HREE seawards.
文摘Agrometeorology and agricultural statistics methods were used to analyze the cases of high temperature heat damage to crab breeding since 2008 in Hongze Lake Beach, finding that the high temperature heat damage was mainly under the comprehensive effects of the highest temperature, duration of high temperature weather, amount of precipitation and sunshine hours. Based on the function relation between the high temperature heat damage index and the influence factors, the linear model was used to describe the weight coefficient of each heat damage factor by using the synthesis correlation of multiple factors. The historical values of the influencing factors were used to make statistical calculation of the heat damage index model of crab culture in Hongze Lake Beach, which achieved good effects when applied in the meteorological operation of river crab culture.
基金financially supported by the Health Bureau of Wuhan(WG17B04)the Health Bureau of Wuhan(WG18Q05).
文摘Objective:To investigate the prevalence of Calodium hepaticum(C.hepaticum)in rodents and insectivores from Wuhan section of the Yangtze River in China,and to provide evidence for the prevention and treatment of hepatic Calodium infection.Methods:Rodents and insectivores were captured from three selected Yangtze River beaches using mousetraps.The three survey sites were divided into six areas according to natural conditions,with 60 mousetraps placed in each area.The liver lesions in the captured rodents were observed by the naked eye and the eggs in the liver tissue were observed by microscopic examination.Results:A total of 1080 mousetraps were placed,and 1075 mousetraps were retrieved,with the retrieve rate as 99.5%.A total of 101 Apodemus agrarius,12 Rattus norvegicus,and 9 Crocidura attenuata were caught.The average density of rodents and insectivores was 10.5%and 0.8%,respectively.DNA of egg nodules from infected rodents showed 98%similarity with that of C.hepaticum 18 S rRNA(LC425008.1).One Rattus norvegicus was infected with C.hepaticum,with an infection rate of 3.23%in the Erqi river beach;the other two beaches did not show the incidence of C.hepaticum.Conclusions:The monitoring of C.hepaticum in the Yangtze River beaches should be strengthened to reduce the risk of human C.hepaticum infection.
