The red imported fire ant, Solenopsis invicta, is a problematic invasive species in China since at least 2003. Over the past 15 years, a numerous studies were published on the impacts of this species on flora, fauna, ...The red imported fire ant, Solenopsis invicta, is a problematic invasive species in China since at least 2003. Over the past 15 years, a numerous studies were published on the impacts of this species on flora, fauna, and ecosystem function in natural and agricultural systems. We reviewed the literature on S. invicta invasion biology and impacts on biodiversity in South China. Both monogyne and polygyne colonies of S. invicta were introduced to China and polygyne colony is the dominant type. The range expansion rate of S. invicta may reach 26.5–48.1 km yr–1 in China. S. invicta forage activities occur year-round, peaking in the summer and fall in South China and show a preference for insects and plant seeds. We describe the ecological impacts of S. invicta on various habitats in South China, including arthropod community structure disruption and decreases in diversity and abundance of native ant species. S. invicta can replace the role of native ants in mutualisms between ants and honeydew-producing Hemiptera, which results in loss of important food resources for native ants and natural enemies of hemipterans. Further research is required to assess the complex ecosystem-level impacts of S. invicta in introduced areas.展开更多
Understanding and predicting species range-expansions and biological invasions is an important challenge in modem ecology because of rapidly changing environments. Recent studies have revealed that consistent within-s...Understanding and predicting species range-expansions and biological invasions is an important challenge in modem ecology because of rapidly changing environments. Recent studies have revealed that consistent within-species variation in behavior （i.e. animal personality） can be imperative for dispersal success, a key stage in the invasion process. Here we investigate the composition and correlation of two important personality traits associated with invasion success, activity and boldness, and how they are connected to sex and individual size in a newly colonised population of the Chinese mitten crab Eriocheir sinensis in Lake Vanem, Sweden. We found no effect of sex or size on behavioral expressions orE. sinensis but a clear positive correlation between boldness and activity. In addition, this study generates important baseline data for monitoring behavioral develop ment, and thereby changing ecological impact, of an invading population over time. This has implications for predicting ecological effects of invasive species as well as for managing ecological invasions.展开更多
The introduction of species is a leading cause of biodiversity loss and habitat alteration.Several species have invaded Mexican freshwater ecosystems,adversely affecting native fishes.Specifically,in the Amacuzac Rive...The introduction of species is a leading cause of biodiversity loss and habitat alteration.Several species have invaded Mexican freshwater ecosystems,adversely affecting native fishes.Specifically,in the Amacuzac River of the Balsas Basin(Central Mexico),at least four non-native cichlids have been recorded:tilapia Oreochromis sp.,convict cichlid Amatitlania nigrofasciata,spotcheek cichlid Thorichthys maculipinnis,and green terror Andinoacara rivulatus.These species co-occur with the Mexican mojarra Amphilophus istlanus,the only native cichlid in the Basin.Invasive cichlids compete for resources such as shelter and food,and prey on offspring of the Mexican mojarra.In the presence of invasive cichlids,the costs and risks of foraging and finding available shelter increase for the native cichlid.Predation pressure from invasive cichlid fishes on the Mexican mojarra increases the time invested by parents in caring for offspring and their stress levels,potentially contributing to Mexican mojarra population declines.Here,we gathered the best evidence available to discuss some mechanisms and consequences of such co-occurrences in relation to reproductive behaviors,parental care,competition for resources,and dominance hierarchy,and how the four invasive cichlids have negatively affected the Mexican mojarra.展开更多
This paper is concerned with the existence and asymptotic behavior of invasion wave solutions for a time-discrete delayed diffusion competitive system with non-quasimonotone conditions. The existence of invasion wave ...This paper is concerned with the existence and asymptotic behavior of invasion wave solutions for a time-discrete delayed diffusion competitive system with non-quasimonotone conditions. The existence of invasion wave solution is investigated by applying upper lower solutions method and Schauder＇s fixed point theorem. Further, with the help of Ikeharas＇ theorem, we establish the exponential decay asymptotic behavior of traveling wave solutions at the minus/plus infinity.展开更多
基金supported by the National Key Research and Development Program of China(2016YFC1201204)the Key Project for Science and Technology Development of Guangdong Province,China(2017B020202009)
文摘The red imported fire ant, Solenopsis invicta, is a problematic invasive species in China since at least 2003. Over the past 15 years, a numerous studies were published on the impacts of this species on flora, fauna, and ecosystem function in natural and agricultural systems. We reviewed the literature on S. invicta invasion biology and impacts on biodiversity in South China. Both monogyne and polygyne colonies of S. invicta were introduced to China and polygyne colony is the dominant type. The range expansion rate of S. invicta may reach 26.5–48.1 km yr–1 in China. S. invicta forage activities occur year-round, peaking in the summer and fall in South China and show a preference for insects and plant seeds. We describe the ecological impacts of S. invicta on various habitats in South China, including arthropod community structure disruption and decreases in diversity and abundance of native ant species. S. invicta can replace the role of native ants in mutualisms between ants and honeydew-producing Hemiptera, which results in loss of important food resources for native ants and natural enemies of hemipterans. Further research is required to assess the complex ecosystem-level impacts of S. invicta in introduced areas.
文摘Understanding and predicting species range-expansions and biological invasions is an important challenge in modem ecology because of rapidly changing environments. Recent studies have revealed that consistent within-species variation in behavior （i.e. animal personality） can be imperative for dispersal success, a key stage in the invasion process. Here we investigate the composition and correlation of two important personality traits associated with invasion success, activity and boldness, and how they are connected to sex and individual size in a newly colonised population of the Chinese mitten crab Eriocheir sinensis in Lake Vanem, Sweden. We found no effect of sex or size on behavioral expressions orE. sinensis but a clear positive correlation between boldness and activity. In addition, this study generates important baseline data for monitoring behavioral develop ment, and thereby changing ecological impact, of an invading population over time. This has implications for predicting ecological effects of invasive species as well as for managing ecological invasions.
基金This study was supported by a CONACYT Frontier Science Grant(64372)Animal Behavior Society(ABS),Developing Nations Research Grant(108).
文摘The introduction of species is a leading cause of biodiversity loss and habitat alteration.Several species have invaded Mexican freshwater ecosystems,adversely affecting native fishes.Specifically,in the Amacuzac River of the Balsas Basin(Central Mexico),at least four non-native cichlids have been recorded:tilapia Oreochromis sp.,convict cichlid Amatitlania nigrofasciata,spotcheek cichlid Thorichthys maculipinnis,and green terror Andinoacara rivulatus.These species co-occur with the Mexican mojarra Amphilophus istlanus,the only native cichlid in the Basin.Invasive cichlids compete for resources such as shelter and food,and prey on offspring of the Mexican mojarra.In the presence of invasive cichlids,the costs and risks of foraging and finding available shelter increase for the native cichlid.Predation pressure from invasive cichlid fishes on the Mexican mojarra increases the time invested by parents in caring for offspring and their stress levels,potentially contributing to Mexican mojarra population declines.Here,we gathered the best evidence available to discuss some mechanisms and consequences of such co-occurrences in relation to reproductive behaviors,parental care,competition for resources,and dominance hierarchy,and how the four invasive cichlids have negatively affected the Mexican mojarra.
文摘This paper is concerned with the existence and asymptotic behavior of invasion wave solutions for a time-discrete delayed diffusion competitive system with non-quasimonotone conditions. The existence of invasion wave solution is investigated by applying upper lower solutions method and Schauder＇s fixed point theorem. Further, with the help of Ikeharas＇ theorem, we establish the exponential decay asymptotic behavior of traveling wave solutions at the minus/plus infinity.
