The influence of fine-scale habitat heterogeneity on invertebrate assemblage structure in upland semi-natural grassland

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Abstract

The Scottish uplands consist of a variety of semi-natural habitats of high nature value that are typically managed by extensive livestock grazing. However, as a result of the decoupling of financial subsidies from production in the recent Common Agricultural Policy reform, sheep numbers in the uplands have significantly declined and there is concern that the conservation value of these habitats is at risk. A large-scale experiment that manipulated sheep grazing management provided an excellent opportunity to examine the influence of fine-scale habitat characteristics on invertebrate assemblages. A Geographical Information System was used to extract habitat data at four spatial scales ranging from 0.25 m to 5.0 m in ellipses around pitfall transects. Multivariate analyses were applied to determine the most appropriate spatial scale and the primary habitat characteristics influencing three categories of invertebrates (i.e., mobile arthropods, immobile invertebrates and carabid beetles). Sites that were grazed year-round, and thus more intensively, were associated with smaller mobile arthropods (e.g., money spiders), tipulid larvae and earthworms, while sites that were grazed during summer months only were associated with larger mobile arthropods (e.g., wolf spiders and Carabus beetles) and sawfly and lepidopteran larvae. Grazing regime and the area of fine and broad-leaved grasses were found to influence all three groups of invertebrates at a range of spatial scales, thus indicating the importance of these variables in predicting assemblage structure. The optimum spatial scale at which to collect associated habitat information was from within 0.25 m for immobile invertebrates, and from within 3 m for mobile arthropods and carabids. This supports the hypothesis that immobile invertebrates react to their surrounding habitat at a finer spatial scale than mobile invertebrates and draws into question the effectiveness of collecting habitat information from directly adjacent to the pitfall traps when studying mobile arthropods.
Original languageEnglish
Pages (from-to)69 - 80
Number of pages12
JournalAgriculture, Ecosystems and Environment
Volume136
Issue number1-2
Publication statusFirst published - 2010

Fingerprint

highlands
grasslands
invertebrates
arthropods
habitats
grazing
Coleoptera
sheep
Common Agricultural Policy
sawflies
Lycosidae
grazing management
larvae
pitfall traps
subsidies
earthworms
geographic information systems
Araneae
livestock
Lepidoptera

Bibliographical note

65800024
646017

Keywords

  • Arthropods
  • Geographic Information System
  • Habitat
  • Spatial scale
  • Upland Grazing
  • Vegetation structure

Cite this

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title = "The influence of fine-scale habitat heterogeneity on invertebrate assemblage structure in upland semi-natural grassland",
abstract = "The Scottish uplands consist of a variety of semi-natural habitats of high nature value that are typically managed by extensive livestock grazing. However, as a result of the decoupling of financial subsidies from production in the recent Common Agricultural Policy reform, sheep numbers in the uplands have significantly declined and there is concern that the conservation value of these habitats is at risk. A large-scale experiment that manipulated sheep grazing management provided an excellent opportunity to examine the influence of fine-scale habitat characteristics on invertebrate assemblages. A Geographical Information System was used to extract habitat data at four spatial scales ranging from 0.25 m to 5.0 m in ellipses around pitfall transects. Multivariate analyses were applied to determine the most appropriate spatial scale and the primary habitat characteristics influencing three categories of invertebrates (i.e., mobile arthropods, immobile invertebrates and carabid beetles). Sites that were grazed year-round, and thus more intensively, were associated with smaller mobile arthropods (e.g., money spiders), tipulid larvae and earthworms, while sites that were grazed during summer months only were associated with larger mobile arthropods (e.g., wolf spiders and Carabus beetles) and sawfly and lepidopteran larvae. Grazing regime and the area of fine and broad-leaved grasses were found to influence all three groups of invertebrates at a range of spatial scales, thus indicating the importance of these variables in predicting assemblage structure. The optimum spatial scale at which to collect associated habitat information was from within 0.25 m for immobile invertebrates, and from within 3 m for mobile arthropods and carabids. This supports the hypothesis that immobile invertebrates react to their surrounding habitat at a finer spatial scale than mobile invertebrates and draws into question the effectiveness of collecting habitat information from directly adjacent to the pitfall traps when studying mobile arthropods.",
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author = "LJ Cole and ML Pollock and D Robertson and JP Holland and DI McCracken and W Harrison",
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language = "English",
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T1 - The influence of fine-scale habitat heterogeneity on invertebrate assemblage structure in upland semi-natural grassland

AU - Cole, LJ

AU - Pollock, ML

AU - Robertson, D

AU - Holland, JP

AU - McCracken, DI

AU - Harrison, W

N1 - 65800024 646017

PY - 2010

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N2 - The Scottish uplands consist of a variety of semi-natural habitats of high nature value that are typically managed by extensive livestock grazing. However, as a result of the decoupling of financial subsidies from production in the recent Common Agricultural Policy reform, sheep numbers in the uplands have significantly declined and there is concern that the conservation value of these habitats is at risk. A large-scale experiment that manipulated sheep grazing management provided an excellent opportunity to examine the influence of fine-scale habitat characteristics on invertebrate assemblages. A Geographical Information System was used to extract habitat data at four spatial scales ranging from 0.25 m to 5.0 m in ellipses around pitfall transects. Multivariate analyses were applied to determine the most appropriate spatial scale and the primary habitat characteristics influencing three categories of invertebrates (i.e., mobile arthropods, immobile invertebrates and carabid beetles). Sites that were grazed year-round, and thus more intensively, were associated with smaller mobile arthropods (e.g., money spiders), tipulid larvae and earthworms, while sites that were grazed during summer months only were associated with larger mobile arthropods (e.g., wolf spiders and Carabus beetles) and sawfly and lepidopteran larvae. Grazing regime and the area of fine and broad-leaved grasses were found to influence all three groups of invertebrates at a range of spatial scales, thus indicating the importance of these variables in predicting assemblage structure. The optimum spatial scale at which to collect associated habitat information was from within 0.25 m for immobile invertebrates, and from within 3 m for mobile arthropods and carabids. This supports the hypothesis that immobile invertebrates react to their surrounding habitat at a finer spatial scale than mobile invertebrates and draws into question the effectiveness of collecting habitat information from directly adjacent to the pitfall traps when studying mobile arthropods.

AB - The Scottish uplands consist of a variety of semi-natural habitats of high nature value that are typically managed by extensive livestock grazing. However, as a result of the decoupling of financial subsidies from production in the recent Common Agricultural Policy reform, sheep numbers in the uplands have significantly declined and there is concern that the conservation value of these habitats is at risk. A large-scale experiment that manipulated sheep grazing management provided an excellent opportunity to examine the influence of fine-scale habitat characteristics on invertebrate assemblages. A Geographical Information System was used to extract habitat data at four spatial scales ranging from 0.25 m to 5.0 m in ellipses around pitfall transects. Multivariate analyses were applied to determine the most appropriate spatial scale and the primary habitat characteristics influencing three categories of invertebrates (i.e., mobile arthropods, immobile invertebrates and carabid beetles). Sites that were grazed year-round, and thus more intensively, were associated with smaller mobile arthropods (e.g., money spiders), tipulid larvae and earthworms, while sites that were grazed during summer months only were associated with larger mobile arthropods (e.g., wolf spiders and Carabus beetles) and sawfly and lepidopteran larvae. Grazing regime and the area of fine and broad-leaved grasses were found to influence all three groups of invertebrates at a range of spatial scales, thus indicating the importance of these variables in predicting assemblage structure. The optimum spatial scale at which to collect associated habitat information was from within 0.25 m for immobile invertebrates, and from within 3 m for mobile arthropods and carabids. This supports the hypothesis that immobile invertebrates react to their surrounding habitat at a finer spatial scale than mobile invertebrates and draws into question the effectiveness of collecting habitat information from directly adjacent to the pitfall traps when studying mobile arthropods.

KW - Arthropods

KW - Geographic Information System

KW - Habitat

KW - Spatial scale

KW - Upland Grazing

KW - Vegetation structure

M3 - Article

VL - 136

SP - 69

EP - 80

JO - Agriculture, Ecosystems and Environment

JF - Agriculture, Ecosystems and Environment

SN - 0167-8809

IS - 1-2

ER -