A comprehensive study of the invasive icefish Neosalanx taihuensis feeding ecology in Erhai Lake was conducted from November 2009 to October 2010. Prey items in the guts of the icefish sampled varied significantly acc...A comprehensive study of the invasive icefish Neosalanx taihuensis feeding ecology in Erhai Lake was conducted from November 2009 to October 2010. Prey items in the guts of the icefish sampled varied significantly according to season. This finding suggests a relationship between fluctuations in available prey in the environment and selective feeding by icefish. N. taihuensis preferred large-sized zooplankton,such as Daphnia and calanoids. Additionally,the gut fullness values differed significantly( P <0.001) among sampling times. To compare the values at different times,samples were taken over a 24 h period every 2 months for the entire year. The feeding activities of the fish were concentrated either in the morning(8:00) and/or at dusk(20:00),except in September 2010. This finding can be explained primarily by the variation in optimum light intensity. Daily N. taihuensis zooplankton consumption varied significantly,both diurnally and among seasons. The daily consumption values ranged from 0.089 to 0.237 g(wet weight) per 100 g wet fish weight in temperatures between 11.50°C and 24.68°C. This is the first report of diel feeding periodicity and daily food consumption of icefish in their invaded ecosystems.展开更多
目的探讨住院老年患者衰弱综合征与下肢运动功能的相关性。方法采用便利抽样法,于2022年12月—2023年5月选取四川大学华西医院老年医学中心65岁及以上住院患者。采用衰弱评估量表、简易机体功能评估量表(Short Physical Performance Bat...目的探讨住院老年患者衰弱综合征与下肢运动功能的相关性。方法采用便利抽样法,于2022年12月—2023年5月选取四川大学华西医院老年医学中心65岁及以上住院患者。采用衰弱评估量表、简易机体功能评估量表(Short Physical Performance Battery,SPPB)、“起立-行走”测试(Timed Up and Go Test,TUGT)对其衰弱程度、下肢运动功能进行评估,并探索衰弱与下肢运动功能的相关性。结果共纳入老年患者501例,男325例(64.9%),女176例(35.1%);衰弱256例(51.1%),衰弱前期161例(32.1%),非衰弱84例(16.8%)。住院老年男性患者衰弱的发生率高于女性患者(P<0.05);80~99岁年龄段患者的衰弱发生率高于65~79岁(P<0.05)。Spearman相关分析结果显示,SPPB各维度与衰弱均呈负相关(P<0.001)、TUGT与衰弱呈正相关(r=0.776,P<0.001)。多重线性回归分析结果显示,下肢运动功能越差,衰弱得分越高。结论住院老年患者衰弱综合征与下肢运动功能关系密切,在临床中可采用下肢运动功能评估预测衰弱的发生,并可通过提高下肢运动功能的针对性干预措施以改善老年患者的衰弱程度。展开更多
The seasonal dynamics of a crustacean zooplankton community in Erhai Lake was investigated from May 2010 to April 2011. In total, 11 species were recorded, including six(6 genera) cladoceran and five(5 genera) copepod...The seasonal dynamics of a crustacean zooplankton community in Erhai Lake was investigated from May 2010 to April 2011. In total, 11 species were recorded, including six(6 genera) cladoceran and five(5 genera) copepod species. The crustacean zooplankton densities ranged from 24.3 to 155.4 ind./L. In winter and spring, the large-bodied cladoceran Daphnia galeata dominated the crustacean plankton community. In summer and autumn, when the colonial or filamentous algae dominated the phytoplankton communities, the small-bodied species(e.g. B osmina fatalis, Ceriodaphnia quadrangular, and Mesocyclops leuckarti) replaced the large-bodied ones. One-way ANOVA and redundancy analysis revealed that community structure was dependent upon total nitrogen, total phosphorus, water temperature, transparency, and the biomass of small algae. The variation in both phytoplankton structure and environmental variables were important factors in the seasonal succession of crustacean zooplankton structure in Erhai Lake.展开更多
基金Supported by the National Major Technology Projects of Water Pollution Control and Management(No.2012ZX07105-004)the National Natural Science Foundation of China(Nos.41173118,40703017,40873079)
文摘A comprehensive study of the invasive icefish Neosalanx taihuensis feeding ecology in Erhai Lake was conducted from November 2009 to October 2010. Prey items in the guts of the icefish sampled varied significantly according to season. This finding suggests a relationship between fluctuations in available prey in the environment and selective feeding by icefish. N. taihuensis preferred large-sized zooplankton,such as Daphnia and calanoids. Additionally,the gut fullness values differed significantly( P <0.001) among sampling times. To compare the values at different times,samples were taken over a 24 h period every 2 months for the entire year. The feeding activities of the fish were concentrated either in the morning(8:00) and/or at dusk(20:00),except in September 2010. This finding can be explained primarily by the variation in optimum light intensity. Daily N. taihuensis zooplankton consumption varied significantly,both diurnally and among seasons. The daily consumption values ranged from 0.089 to 0.237 g(wet weight) per 100 g wet fish weight in temperatures between 11.50°C and 24.68°C. This is the first report of diel feeding periodicity and daily food consumption of icefish in their invaded ecosystems.
文摘目的探讨住院老年患者衰弱综合征与下肢运动功能的相关性。方法采用便利抽样法,于2022年12月—2023年5月选取四川大学华西医院老年医学中心65岁及以上住院患者。采用衰弱评估量表、简易机体功能评估量表(Short Physical Performance Battery,SPPB)、“起立-行走”测试(Timed Up and Go Test,TUGT)对其衰弱程度、下肢运动功能进行评估,并探索衰弱与下肢运动功能的相关性。结果共纳入老年患者501例,男325例(64.9%),女176例(35.1%);衰弱256例(51.1%),衰弱前期161例(32.1%),非衰弱84例(16.8%)。住院老年男性患者衰弱的发生率高于女性患者(P<0.05);80~99岁年龄段患者的衰弱发生率高于65~79岁(P<0.05)。Spearman相关分析结果显示,SPPB各维度与衰弱均呈负相关(P<0.001)、TUGT与衰弱呈正相关(r=0.776,P<0.001)。多重线性回归分析结果显示,下肢运动功能越差,衰弱得分越高。结论住院老年患者衰弱综合征与下肢运动功能关系密切,在临床中可采用下肢运动功能评估预测衰弱的发生,并可通过提高下肢运动功能的针对性干预措施以改善老年患者的衰弱程度。
基金Supported by the National Natural Science Foundation of China(No.31070387)the National Water Pollution Control and Management Technology Major Projects of China(No.2008ZC07105-005)
文摘The seasonal dynamics of a crustacean zooplankton community in Erhai Lake was investigated from May 2010 to April 2011. In total, 11 species were recorded, including six(6 genera) cladoceran and five(5 genera) copepod species. The crustacean zooplankton densities ranged from 24.3 to 155.4 ind./L. In winter and spring, the large-bodied cladoceran Daphnia galeata dominated the crustacean plankton community. In summer and autumn, when the colonial or filamentous algae dominated the phytoplankton communities, the small-bodied species(e.g. B osmina fatalis, Ceriodaphnia quadrangular, and Mesocyclops leuckarti) replaced the large-bodied ones. One-way ANOVA and redundancy analysis revealed that community structure was dependent upon total nitrogen, total phosphorus, water temperature, transparency, and the biomass of small algae. The variation in both phytoplankton structure and environmental variables were important factors in the seasonal succession of crustacean zooplankton structure in Erhai Lake.
