The ceo-geographical division of forest insects in China is generally divided into 4 levels: region, subrcgion, area and province. The region is formed by isolation of ocean, high mountain and desert etc. The division...The ceo-geographical division of forest insects in China is generally divided into 4 levels: region, subrcgion, area and province. The region is formed by isolation of ocean, high mountain and desert etc. The division of subrcgion is on the basis of resistance of extreme temperature humidity in winter. The division of area or province is on the basis of landform, type of vegetation in forest zone and temperature zone.展开更多
An investigation method with sample plots was used to study insect communities in four different growth phases of natural Populus euphratica forests, which are juvenile, middle aged, over-mature and degraded forests, ...An investigation method with sample plots was used to study insect communities in four different growth phases of natural Populus euphratica forests, which are juvenile, middle aged, over-mature and degraded forests, in Tarim, Xinjiang in July, 2005 and April, 2006. In our studies, 5,116 insect specimens, belonging to 12 orders, 61 families and 141 species, were collected. Lepidoptera and Coleoptera were the dominant orders. In middle-aged forests, species, individual numbers and diversity indices of insect com-munities were higher than those in other woodlands. The species richness and diversity indices were lowest in degraded forests be-cause of extremely scarce vegetation.展开更多
Under global climate change,high and low temperature extremes can drive shifts in species distributions.Across the range of a species,thermal tolerance is based on acclimatization,plasticity,and may undergo selection,...Under global climate change,high and low temperature extremes can drive shifts in species distributions.Across the range of a species,thermal tolerance is based on acclimatization,plasticity,and may undergo selection,shaping resilience to temperature stress.In this study,we measured variation in cold temperature tolerance of early instar larvae of an invasive forest insect,Lymantria dispar dispar L.(Lepidoptera:Erebidae),using populations sourced from a range of climates within the current introduced range in the Eastern United States.We tested for population differences in chill coma recovery(CCR)by measuring recovery time following a period of exposure to a nonlethal cold temperature in 2 cold exposure experiments.A 3rd experiment quantified growth responses after CCR to evaluate sublethal effects.Our results indicate that cold tolerance is linked to regional climate,with individuals from populations sourced from colder climates recovering faster from chill coma.While this geographic gradient is seen in many species,detecting this pattern is notable for an introduced species founded from a single point-source introduction.We demonstrate that the cold temperatures used in our experiments occur in nature during cold spells after spring egg hatch,but impacts to growth and survival appear low.We expect that population differences in cold temperature performance manifest more from differences in temperature-dependent growth than acute exposure.Evaluating intraspecific variation in cold tolerance increases our understanding of the role of climatic gradients on the physiology of an invasive species,and contributes to tools for predicting further expansion.展开更多
Eleven species of alien invasive forest insect pests have been found since the early time that insect species had been taken recorded in China. Their origins, inland distribution, invasive time, hosts, causing damage ...Eleven species of alien invasive forest insect pests have been found since the early time that insect species had been taken recorded in China. Their origins, inland distribution, invasive time, hosts, causing damage are recorded in this paper for the evidence of biological invasion. Their control methods are also studied or discussed.展开更多
文摘The ceo-geographical division of forest insects in China is generally divided into 4 levels: region, subrcgion, area and province. The region is formed by isolation of ocean, high mountain and desert etc. The division of subrcgion is on the basis of resistance of extreme temperature humidity in winter. The division of area or province is on the basis of landform, type of vegetation in forest zone and temperature zone.
文摘An investigation method with sample plots was used to study insect communities in four different growth phases of natural Populus euphratica forests, which are juvenile, middle aged, over-mature and degraded forests, in Tarim, Xinjiang in July, 2005 and April, 2006. In our studies, 5,116 insect specimens, belonging to 12 orders, 61 families and 141 species, were collected. Lepidoptera and Coleoptera were the dominant orders. In middle-aged forests, species, individual numbers and diversity indices of insect com-munities were higher than those in other woodlands. The species richness and diversity indices were lowest in degraded forests be-cause of extremely scarce vegetation.
基金conducted under USDA APHIS permit numbers P526P-17-03681 and P526P-20-02026(K.L.G.)and P526P-16-04388(D.P.)supported by the National Science Foundation under Grant DEB 1702701(K.L.G.)and 1702312(D.P.)under the Macrosystems Biology Program and the Thomas F.and Kate Miller Jeffress Memorial Trust+1 种基金funding was provided by the Slow-the-Spread Foundationthe University of Richmond School of Arts&Sciences.
文摘Under global climate change,high and low temperature extremes can drive shifts in species distributions.Across the range of a species,thermal tolerance is based on acclimatization,plasticity,and may undergo selection,shaping resilience to temperature stress.In this study,we measured variation in cold temperature tolerance of early instar larvae of an invasive forest insect,Lymantria dispar dispar L.(Lepidoptera:Erebidae),using populations sourced from a range of climates within the current introduced range in the Eastern United States.We tested for population differences in chill coma recovery(CCR)by measuring recovery time following a period of exposure to a nonlethal cold temperature in 2 cold exposure experiments.A 3rd experiment quantified growth responses after CCR to evaluate sublethal effects.Our results indicate that cold tolerance is linked to regional climate,with individuals from populations sourced from colder climates recovering faster from chill coma.While this geographic gradient is seen in many species,detecting this pattern is notable for an introduced species founded from a single point-source introduction.We demonstrate that the cold temperatures used in our experiments occur in nature during cold spells after spring egg hatch,but impacts to growth and survival appear low.We expect that population differences in cold temperature performance manifest more from differences in temperature-dependent growth than acute exposure.Evaluating intraspecific variation in cold tolerance increases our understanding of the role of climatic gradients on the physiology of an invasive species,and contributes to tools for predicting further expansion.
文摘Eleven species of alien invasive forest insect pests have been found since the early time that insect species had been taken recorded in China. Their origins, inland distribution, invasive time, hosts, causing damage are recorded in this paper for the evidence of biological invasion. Their control methods are also studied or discussed.
