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The ecology and aspects of behaviour of the invasive alien amphipod Arcitalitrus dorrieni (Hunt) in South West Wales (UK). / Isabella Caroline Julietta Brey

Swansea University Author: Isabella Caroline Julietta Brey

Abstract

This study initially provides a detailed investigation of the population dynamics of the introduced terrestrial amphipod Arcitalitrus dorrieni in a coastal deciduous woodland. It also assesses this alien's effect on the native leaf-litter fauna. The mean population density of A. dorrieni in thi...

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Published: 2005
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42558
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spelling 2018-08-02T16:24:29.6654041 v2 42558 2018-08-02 The ecology and aspects of behaviour of the invasive alien amphipod Arcitalitrus dorrieni (Hunt) in South West Wales (UK). 8f71fe784225a9c8be236c347c9928b9 NULL Isabella Caroline Julietta Brey Isabella Caroline Julietta Brey true true 2018-08-02 This study initially provides a detailed investigation of the population dynamics of the introduced terrestrial amphipod Arcitalitrus dorrieni in a coastal deciduous woodland. It also assesses this alien's effect on the native leaf-litter fauna. The mean population density of A. dorrieni in this habitat was 364 individuals/m . The maximum densities (around 880 individuals/m2) occurred in habitat with leaf litter of Quercus ilex overlying friable soil. Population density was strongly affected by low temperatures, suggesting that frost is one of the major regulating factors controlling the amphipod's spread. Native invertebrate communities were not significantly altered by the presence of A. dorrieni, but some groups seemed to benefit from the landhopper's presence, while others appeared to suffer. The latter part of this study is devoted to the design of effective handling and maintenance techniques for A. dorrieni, and a series of laboratory-based experiments investigating both ecological and behavioural aspects of its biology. These include a determination of the amphipod's feeding rates and food preferences, assessments of the potential predation pressure by native species, and examination of A. dorheni's activity rhythms and dispersal capabilities. A. dorrieni feeds exclusively on dead plant material, and consumes around 20% of its bodyweight per day at ambient temperatures of 13-20&deg;C. Feeding ceases at temperatures around 4&deg;C. In deciduous woodland, A. dorrieni is estimated to consume 25-35% of the annual litter fall at the experimental location. Many native predators accept A. dorheni as a food item, and thus it probably faces considerable predation pressure in Britain. This may be slowing population expansion. It was established that A. dorrieni has an essentially crepuscular activity rhythm. Its ability to successfully cross a minimum of 2m of open space in one night was demonstrated. Overall, the results indicate much potential for a continued spread of the alien amphipod across the British Isles. E-Thesis Ecology.;Zoology. 31 12 2005 2005-12-31 COLLEGE NANME Biosciences COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:29.6654041 2018-08-02T16:24:29.6654041 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Isabella Caroline Julietta Brey NULL 1 0042558-02082018162503.pdf 10805307.pdf 2018-08-02T16:25:03.9570000 Output 27804041 application/pdf E-Thesis true 2018-08-02T16:25:03.9570000 false
title The ecology and aspects of behaviour of the invasive alien amphipod Arcitalitrus dorrieni (Hunt) in South West Wales (UK).
spellingShingle The ecology and aspects of behaviour of the invasive alien amphipod Arcitalitrus dorrieni (Hunt) in South West Wales (UK).
Isabella Caroline Julietta Brey
title_short The ecology and aspects of behaviour of the invasive alien amphipod Arcitalitrus dorrieni (Hunt) in South West Wales (UK).
title_full The ecology and aspects of behaviour of the invasive alien amphipod Arcitalitrus dorrieni (Hunt) in South West Wales (UK).
title_fullStr The ecology and aspects of behaviour of the invasive alien amphipod Arcitalitrus dorrieni (Hunt) in South West Wales (UK).
title_full_unstemmed The ecology and aspects of behaviour of the invasive alien amphipod Arcitalitrus dorrieni (Hunt) in South West Wales (UK).
title_sort The ecology and aspects of behaviour of the invasive alien amphipod Arcitalitrus dorrieni (Hunt) in South West Wales (UK).
author_id_str_mv 8f71fe784225a9c8be236c347c9928b9
author_id_fullname_str_mv 8f71fe784225a9c8be236c347c9928b9_***_Isabella Caroline Julietta Brey
author Isabella Caroline Julietta Brey
author2 Isabella Caroline Julietta Brey
format E-Thesis
publishDate 2005
institution Swansea University
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description This study initially provides a detailed investigation of the population dynamics of the introduced terrestrial amphipod Arcitalitrus dorrieni in a coastal deciduous woodland. It also assesses this alien's effect on the native leaf-litter fauna. The mean population density of A. dorrieni in this habitat was 364 individuals/m . The maximum densities (around 880 individuals/m2) occurred in habitat with leaf litter of Quercus ilex overlying friable soil. Population density was strongly affected by low temperatures, suggesting that frost is one of the major regulating factors controlling the amphipod's spread. Native invertebrate communities were not significantly altered by the presence of A. dorrieni, but some groups seemed to benefit from the landhopper's presence, while others appeared to suffer. The latter part of this study is devoted to the design of effective handling and maintenance techniques for A. dorrieni, and a series of laboratory-based experiments investigating both ecological and behavioural aspects of its biology. These include a determination of the amphipod's feeding rates and food preferences, assessments of the potential predation pressure by native species, and examination of A. dorheni's activity rhythms and dispersal capabilities. A. dorrieni feeds exclusively on dead plant material, and consumes around 20% of its bodyweight per day at ambient temperatures of 13-20&deg;C. Feeding ceases at temperatures around 4&deg;C. In deciduous woodland, A. dorrieni is estimated to consume 25-35% of the annual litter fall at the experimental location. Many native predators accept A. dorheni as a food item, and thus it probably faces considerable predation pressure in Britain. This may be slowing population expansion. It was established that A. dorrieni has an essentially crepuscular activity rhythm. Its ability to successfully cross a minimum of 2m of open space in one night was demonstrated. Overall, the results indicate much potential for a continued spread of the alien amphipod across the British Isles.
published_date 2005-12-31T03:53:12Z
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score 11.012678

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