Spatial dynamics of beetles living on exposed riverine sediments in the upper River Severn: method development and preliminary results

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@article{cc9e81a453644098a90701f6ba37b31f,
title = "Spatial dynamics of beetles living on exposed riverine sediments in the upper River Severn: method development and preliminary results",
abstract = "1. Exposed riverine sediments (ERS) are habitats for a large number of rare and specialized invertebrates and, as such, are of considerable conservation importance. Actions that threaten ERS specialists operate on a variety of scales and include river engineering, flow regulation and livestock damage. Populations of specific species of ERS specialist beetles are likely to exhibit individual responses to these threats, depending on the spatial structure and dynamics of the population. An understanding of the spatial dynamics of ERS specialist beetles is, therefore, essential if conservation initiatives are to be successful. 2. A mark-recapture experiment was used to investigate the spatial dynamics of beetles on a section of the upper River Severn, mid-Wales, during June and August 2002. Two species of carabid, Bembidion afrocaeruleum Stephens and Bembidion decorum (Zenker), and one elaterid, Fleutiauxcllus inaritimus (Curtis), were individually marked and released on one of nine discrete patches of ERS demonstrating a range of patch size, sediment size, habitat heterogeneity, degree of shading, vegetation cover and grazing intensity. The methods used to trap, handle and individually mark beetles were all found to be suitable. 3. Population size of B. atrocaerideum was mainly determined by ERS patch size, suggesting that, in contrast to F. maritimus, this species used all ERS microhabitats. 4. During the June study, 5.7% of marked and recaptured B. atrocaeruleton and 10% of marked and recaptured B. decorum actively moved between ERS patches over water or through thick vegetation in both upstream and downstream directions. Inter-patch movements of > 65 m for B. atrocaeridetan and > 135 In for B. decorian were detected. Movement rates in August were lower. F. maritimus showed no evidence of inter-patch movement. 5. The lower rate of dispersal and more specific habitat requirements are postulated as reasons for the greater rarity of F. inaritimus. Copyright (c) 2004 John Wiley 5 Sons, Ltd.",
keywords = "mark-recapture., patchy population, Bembidion decorum, Fleutiauxellus maritimus, Bembidion atrocaeruleum, metapopulation",
author = "Adam Bates and Jonathan Sadler and A Fowles and C Butcher",
year = "2005",
month = mar,
day = "1",
doi = "10.1002/aqc.642",
language = "English",
volume = "15",
pages = "159--174",
journal = "Aquatic Conservation: marine and freshwater ecosystems",
issn = "1052-7613",
publisher = "Wiley",
number = "2",

}

RIS

TY - JOUR

T1 - Spatial dynamics of beetles living on exposed riverine sediments in the upper River Severn: method development and preliminary results

AU - Bates, Adam

AU - Sadler, Jonathan

AU - Fowles, A

AU - Butcher, C

PY - 2005/3/1

Y1 - 2005/3/1

N2 - 1. Exposed riverine sediments (ERS) are habitats for a large number of rare and specialized invertebrates and, as such, are of considerable conservation importance. Actions that threaten ERS specialists operate on a variety of scales and include river engineering, flow regulation and livestock damage. Populations of specific species of ERS specialist beetles are likely to exhibit individual responses to these threats, depending on the spatial structure and dynamics of the population. An understanding of the spatial dynamics of ERS specialist beetles is, therefore, essential if conservation initiatives are to be successful. 2. A mark-recapture experiment was used to investigate the spatial dynamics of beetles on a section of the upper River Severn, mid-Wales, during June and August 2002. Two species of carabid, Bembidion afrocaeruleum Stephens and Bembidion decorum (Zenker), and one elaterid, Fleutiauxcllus inaritimus (Curtis), were individually marked and released on one of nine discrete patches of ERS demonstrating a range of patch size, sediment size, habitat heterogeneity, degree of shading, vegetation cover and grazing intensity. The methods used to trap, handle and individually mark beetles were all found to be suitable. 3. Population size of B. atrocaerideum was mainly determined by ERS patch size, suggesting that, in contrast to F. maritimus, this species used all ERS microhabitats. 4. During the June study, 5.7% of marked and recaptured B. atrocaeruleton and 10% of marked and recaptured B. decorum actively moved between ERS patches over water or through thick vegetation in both upstream and downstream directions. Inter-patch movements of > 65 m for B. atrocaeridetan and > 135 In for B. decorian were detected. Movement rates in August were lower. F. maritimus showed no evidence of inter-patch movement. 5. The lower rate of dispersal and more specific habitat requirements are postulated as reasons for the greater rarity of F. inaritimus. Copyright (c) 2004 John Wiley 5 Sons, Ltd.

AB - 1. Exposed riverine sediments (ERS) are habitats for a large number of rare and specialized invertebrates and, as such, are of considerable conservation importance. Actions that threaten ERS specialists operate on a variety of scales and include river engineering, flow regulation and livestock damage. Populations of specific species of ERS specialist beetles are likely to exhibit individual responses to these threats, depending on the spatial structure and dynamics of the population. An understanding of the spatial dynamics of ERS specialist beetles is, therefore, essential if conservation initiatives are to be successful. 2. A mark-recapture experiment was used to investigate the spatial dynamics of beetles on a section of the upper River Severn, mid-Wales, during June and August 2002. Two species of carabid, Bembidion afrocaeruleum Stephens and Bembidion decorum (Zenker), and one elaterid, Fleutiauxcllus inaritimus (Curtis), were individually marked and released on one of nine discrete patches of ERS demonstrating a range of patch size, sediment size, habitat heterogeneity, degree of shading, vegetation cover and grazing intensity. The methods used to trap, handle and individually mark beetles were all found to be suitable. 3. Population size of B. atrocaerideum was mainly determined by ERS patch size, suggesting that, in contrast to F. maritimus, this species used all ERS microhabitats. 4. During the June study, 5.7% of marked and recaptured B. atrocaeruleton and 10% of marked and recaptured B. decorum actively moved between ERS patches over water or through thick vegetation in both upstream and downstream directions. Inter-patch movements of > 65 m for B. atrocaeridetan and > 135 In for B. decorian were detected. Movement rates in August were lower. F. maritimus showed no evidence of inter-patch movement. 5. The lower rate of dispersal and more specific habitat requirements are postulated as reasons for the greater rarity of F. inaritimus. Copyright (c) 2004 John Wiley 5 Sons, Ltd.

KW - mark-recapture.

KW - patchy population

KW - Bembidion decorum

KW - Fleutiauxellus maritimus

KW - Bembidion atrocaeruleum

KW - metapopulation

UR - http://www.scopus.com/inward/record.url?scp=15944399450&partnerID=8YFLogxK

U2 - 10.1002/aqc.642

DO - 10.1002/aqc.642

M3 - Article

VL - 15

SP - 159

EP - 174

JO - Aquatic Conservation: marine and freshwater ecosystems

JF - Aquatic Conservation: marine and freshwater ecosystems

SN - 1052-7613

IS - 2

ER -