Conservation implications of long-term changes detected in a lowland heath plant metacommunity

•We measured long-term changes in a vascular plant heathland metacommunity over 70years.•We compared results if partly degraded sites were excluded from the metacommunity.•In both cases we found significant decreases in α and γ diversity and loss of metacommunity structure.•Changes were due to local...

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Veröffentlicht in:Biological conservation 2013-11, Vol.167, p.325-333
Hauptverfasser: Diaz, Anita, Keith, Sally A., Bullock, James M., Hooftman, Danny A.P., Newton, Adrian C.
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container_title Biological conservation
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creator Diaz, Anita
Keith, Sally A.
Bullock, James M.
Hooftman, Danny A.P.
Newton, Adrian C.
description •We measured long-term changes in a vascular plant heathland metacommunity over 70years.•We compared results if partly degraded sites were excluded from the metacommunity.•In both cases we found significant decreases in α and γ diversity and loss of metacommunity structure.•Changes were due to local management differences and wider environmental change.•Findings support the need for regional-scale conservation strategies and plans. Conservation management that is focused on the scale of individual habitat patches rarely considers the implications for conservation of metacommunities at the regional scale. Here we examine the conservation implications of long-term changes identified in a vascular plant metacommunity associated with lowland heathland in Dorset, UK. This was achieved by re-surveying 150 patches that were first surveyed in the 1930s and assessing changes in species distributions, diversity, community composition and metacommunity structure. Results were compared for two sets: (i) all remaining heathland patches and (ii) intact heaths, excluding partly degraded sites. Overall, patterns of change were similar for the two sets. Values of γ- and α-diversity both decreased over time as individual patches shifted towards either woodland or improved grassland communities. However, only the intact heaths set exhibited a significant decrease in β-diversity. Both sets lost metacommunity structure over time, suggesting a change in underlying processes. These changes were attributable both to management regimes adopted at local sites, relating to their differing ownership, and to wider processes of environmental change. These results highlight the need to place site-based conservation actions in the context of regional-scale processes, to ensure the long-term conservation of metacommunity structure and function.
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Conservation management that is focused on the scale of individual habitat patches rarely considers the implications for conservation of metacommunities at the regional scale. Here we examine the conservation implications of long-term changes identified in a vascular plant metacommunity associated with lowland heathland in Dorset, UK. This was achieved by re-surveying 150 patches that were first surveyed in the 1930s and assessing changes in species distributions, diversity, community composition and metacommunity structure. Results were compared for two sets: (i) all remaining heathland patches and (ii) intact heaths, excluding partly degraded sites. Overall, patterns of change were similar for the two sets. Values of γ- and α-diversity both decreased over time as individual patches shifted towards either woodland or improved grassland communities. However, only the intact heaths set exhibited a significant decrease in β-diversity. 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source ScienceDirect Journals (5 years ago - present)
subjects Animal, plant and microbial ecology
Applied ecology
biogeography
Biological and medical sciences
Biological diversity
Communities
community structure
Conservation
Conservation, protection and management of environment and wildlife
Diversity
Extinction
Fundamental and applied biological sciences. Psychology
General aspects
Grasslands
habitats
heathlands
Land use change
Lowlands
Management
Parks, reserves, wildlife conservation. Endangered species: population survey and restocking
Plants (organisms)
Succession
Wildlife conservation
Woodlands
title Conservation implications of long-term changes detected in a lowland heath plant metacommunity
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