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    Consequences for lotic ecosystems of invasion by signal crayfish 
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    Consequences for lotic ecosystems of invasion by signal crayfish

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    HAYESConsequencesFor2012.pdf (1.647Mb)
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    Queen Mary University of London
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    Abstract
    Non-native invasive species are major drivers of biodiversity loss and ecosystemlevel modification. The signal crayfish (Pacifastacus leniusculus) is a highly successful invasive species and demonstrates traits often seen in keystone species, including top-down predatory effects, a high degree of omnivory, and an ability to physically modify its habitat. From field surveys, and in situ and artificial channel experiments, I show that signal crayfish have direct and indirect impacts on the benthos, as well as ecosystem process rates, in lowland, chalk stream ecosystems. Furthermore, I show that these effects are often dependent on crayfish life stage. I demonstrate that two native fish species (chub, Leuciscus cephalus and bullhead, Cottus gobio) may be affected positively, as well as negatively, by signal crayfish invasion. In addition, population genetics reveals overall high levels of genetic diversity in populations of signal crayfish in the UK.
    Authors
    Hayes, Richard Birchall
    URI
    http://qmro.qmul.ac.uk/xmlui/handle/123456789/2484
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    • Theses [3592]
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    The copyright of this thesis rests with the author and no quotation from it or information derived from it may be published without the prior written consent of the author
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