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Browsing by Subject "range expansion"

Now showing 1 - 5 of 5
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    Complete data for Overwinter survival of Corbicula fluminea in a central Minnesota lake
    (2021-11-01) Weber, Megan M; Cibulka, Daniel; mmweber@umn.edu; Weber, Megan M; Minnesota Aquatic Invasive Species Research Center
    Corbicula fluminea is regarded as one of the most pervasive freshwater aquatic invasive species in the world. It has been widely cited to have a lower lethal temperature threshold of 2 degrees Celcius, which suggests the species would be unable to survive in Minnesota outside of areas of thermal refuge from sources such as power plant, water treatment facility, and other raw water user effluent). In August 2020 a volunteer participating in Starry Trek, an aquatic invasive species early detection event, recovered live C. fluminea from an inland Minnesota lake with no known thermal refuge (Briggs Lake, Sherburne County). This data set documents the distribution, overwinter survival, and size class structure of the population in Briggs Lake and observational data at a nearby lake (Big Lake, Sherburne County) where additional clams were discovered by a volunteer towards the end of the Briggs Lake project timeline. The data from this study are available here for public use.
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    Data from: Development of an aggressive bark beetle on novel hosts: Implications for outbreaks in an invaded range
    (2017-11-11) Rosenberger, Derek W; Venette, Robert C; Aukema, Brian H; dwrosenberger@olivet.edu; Rosenberger, Derek W
    Mountain pine beetle (Dendroctonus ponderosae Hopkins) is an aggressive bark beetle native to western North America currently expanding its range east. Should it reach northeastern North American pine forests, it is unclear how novel pine hosts might affect traits related to reproduction and development. These data are the result of studies meant to determine how four novel pine hosts might impact mountain pine beetle reproduction and development, relative to two historical hosts.
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    Range expansion of Lymantria dispar dispar (L.) (Lepidoptera: Erebidae) along its north-western margin in North America despite low predicted climatic suitability
    (2018-09-27) Aukema, Brian H; bhaukema@umn.edu; Aukema, Brian H; University of Minnesota Forest Entomology Lab
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    Risk of invasion by walnut twig beetle throughout eastern North America
    (2016-08) Hefty, Andrea
    The walnut twig beetle (Pityophthorus juglandis Blackman) is a domestic alien invasive bark beetle in the United States of America (USA) that vectors a phytopathogenic fungus. Together, the beetle and fungus cause thousand cankers disease in species of Juglans and Pterocarya. Geographic range expansion by P. juglandis from its native range in the southwestern USA throughout the western United States and isolated areas of the eastern United States provides evidence for human-mediated movement. The disease is now present in more than 120 counties on naïve native and cultivated hosts in the eastern and western USA and in northern Italy. This research describes the cold mortality and host suitability of P. juglandis. I measured the cold tolerance of P. juglandis adults and larvae from a northern California population monthly from January 2013 to May 2014. I found significant seasonal changes in adult supercooling points in fall, winter, and spring. I observed a shift in cold-tolerance strategy in P. juglandis adults from freeze-intolerance (December 2013 and January 2014) to partial freeze-tolerance (February 2014). Adults appear to be more cold-hardy than larvae. Predicted winter survivorship in the southeastern USA is higher than in the northeastern USA. I conducted field and laboratory trials to determine if reproduction by P. juglandis varies between two black walnut (Juglans nigra L.) parent trees and black walnut and butternut (Juglans cinerea L.). Fewer adult offspring developed in branch sections of the black walnut maternal ‘Sparrow’ parent than the paternal ‘Schessler’ parent over three summer months and one winter month in the lab. In the field, P. juglandis reproduction in black walnut and butternut did not differ. In an expanded laboratory study of host suitability, I screened 11 Juglans spp., one Pterocarya sp., and two Carya spp. over two years. Eleven Juglans and one Pterocarya species supported complete brood development. Julgans nigra, J. californica, and J. hindsii had the greatest levels of reproduction. Less suitable hosts include native southwestern United States hosts (J. major and J. microcarpa), Eurasian species (J. regia), Asian butternuts (J. ailantifolia, J. mandshurica, and J. cathayensis), and native eastern United States butternut (J. cinerea) and Japanese walnut-butternut hybrid (J. ailantifolia × cinerea). The two Carya species were not hosts. Finally, I present a framework that provides strategies for accessing stakeholder knowledge of unspecified pathways that may move forest insect pests. Using social science, stakeholder analysis, and design principles, the framework provides risk managers a tool to consult stakeholders for pathway information. The result is a list of pathways that can be validated independently. My research provides biological information of the potentially limiting factors of the spread and establishment of P. juglandis. Although the impacts of thousand cankers disease appear variable, the probability of exposure of walnut to P. juglandis appears to be limited by cold temperatures and host species. The overall risk of P. juglandis to the eastern United States is not determined by this body of work. The national perception of risk or concern over P. juglandis to walnut has decreased since I began this dissertation. Despite the shift in national perception, however, the completion of this work provides state and federal regulators information for improved decision-making regarding trapping and monitoring, quarantines, and how to research unspecified pathways of movement.
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    Susceptibility and suitability of northeastern North American pines for mountain pine beetle, Dendroctonus ponderosae Hopkins
    (2016-06) Rosenberger, Derek
    The mountain pine beetle (Dendroctonus ponderosae Hopkins) is the most aggressive bark beetle (Coleoptera: Curculionidae) in western North America. This insect is currently expanding its range eastward through the Canadian boreal forest. Continued range expansion, or introduction via infested material from western North America, could lead to novel associations between the mountain pine beetle and eastern pines. This research seeks to determine the susceptibility and suitability of pine species common to northeastern North America for mountain pine beetle. Studies were conducted in a common garden environment on logs of four common eastern pines, red (Pinus resinosa), jack (P. banksiana), eastern white (P. strobus) and Scots (P. sylvestris) pine, and two historic hosts, lodgepole (P. contorta) and ponderosa (P. ponderosa) pine. Constitutive defenses pose no significant barrier to colonization of eastern pines by mountain pine beetle. The proportion of female beetles that established fertile egg galleries differed among eastern pines, but were similar to historic hosts. Foraging beetles were generally no more attracted to logs of eastern pines containing boring beetles than to a control. Chemical analysis of the phloem suggests that host kairomones critical for secondary attraction were minimal among novel pines and likely resulting in less attraction than to historic hosts. Overwintering capacity of developing brood was affected by eastern pines. Rapid development in novel pines resulted in greater proportions of brood entering winter in less cold tolerant life stages than historic hosts. The strategy and degree of cold tolerance of fourth instars were affected by natal pine host. Field validation of logistic regression models demonstrated that models based on the insect freezing temperature underestimate cold mortality, while lower lethal temperature curves more accurately project mortality due to cold. Finally, we found that constitutive defenses pose no barrier to reproduction among novel pines. Indeed, novel pines can have up to twice the reproductive potential, and demonstrate greater brood fitness than historic hosts. However, variable rates of development among novel hosts could result in desynchronized or extended emergence periods in mixed stands. Matches between species specific development rates and climate will be crucial for outbreaks to occur in eastern forests.