Escapement, route choice, barrier passage and entrainment of seaward migrating European eel, Anguilla anguilla, within a highly regulated lowland river
Fluvial disconnectivity can have important impacts on fish populations, including hindering movement between habitats required for different ontogenic stages. Recruitment of the European eel (Anguilla anguilla) has reduced by over 90% since the early 1980's, in part due to the effect of riverin...
Published in: | Ecological Engineering |
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Online Access: | https://eprints.soton.ac.uk/353278/ https://eprints.soton.ac.uk/353278/1/Piper_2013_escapement_eprints.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:353278 2023-07-30T03:56:13+02:00 Escapement, route choice, barrier passage and entrainment of seaward migrating European eel, Anguilla anguilla, within a highly regulated lowland river Piper, Adam T. Wright, Ros Walker, Alan Kemp, P.S. 2013-08 text https://eprints.soton.ac.uk/353278/ https://eprints.soton.ac.uk/353278/1/Piper_2013_escapement_eprints.pdf en English eng https://eprints.soton.ac.uk/353278/1/Piper_2013_escapement_eprints.pdf Piper, Adam T., Wright, Ros, Walker, Alan and Kemp, P.S. (2013) Escapement, route choice, barrier passage and entrainment of seaward migrating European eel, Anguilla anguilla, within a highly regulated lowland river. Ecological Engineering, 57, 88-96. (doi:10.1016/j.ecoleng.2013.04.030 <http://dx.doi.org/10.1016/j.ecoleng.2013.04.030>). Article PeerReviewed 2013 ftsouthampton https://doi.org/10.1016/j.ecoleng.2013.04.030 2023-07-09T21:47:05Z Fluvial disconnectivity can have important impacts on fish populations, including hindering movement between habitats required for different ontogenic stages. Recruitment of the European eel (Anguilla anguilla) has reduced by over 90% since the early 1980's, in part due to the effect of riverine barriers on its catadromous migration. There is a legislative requirement to restore free passage, increase habitat availability, and limit anthropogenic losses at intakes to aid eel recovery and good ecological status; necessitating an improved understanding of underlying processes. Escapement, route choice, delay at structures, and entrainment at water abstraction points of downstream migrating silver eels were examined using acoustic and Passive Integrated Transponder (PIT) telemetry in the heavily regulated lower river Stour, UK. Downstream migrating adult eel (n = 69) were trapped approximately 10 km upstream of the tidal limit, surgically implanted with an acoustic transducer and PIT transponder, and released between October and December in 2009 and 2010. Movements of tagged individuals were monitored by a linear array of 19 fixed acoustic receivers extending from the release site, through the last 9.2 km of the freshwater catchment. Three groups of water control structures, two water abstraction intakes and several possible routes of migration are present in the reach. Seventy six and 65% of tagged eels escaped from the study reach in 2009 and 2010, respectively. Entrainment at a single intake was the principal cause of loss and positively related to rapid increases in abstraction whilst eels were in the vicinity of the intake. Route choice into the estuary was dependent on discharge over a large intertidal weir; opening regimes of a tidal gate at the termination of the alternative channel; and abstraction rate at a nearby water intake. Long delays (up to 68.5 days) and recurrent behaviour were associated with several structures in the study reach; high variability between individuals reflected the management of ... Article in Journal/Newspaper Anguilla anguilla University of Southampton: e-Prints Soton Weir ENVELOPE(177.167,177.167,-84.983,-84.983) Ecological Engineering 57 88 96 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Fluvial disconnectivity can have important impacts on fish populations, including hindering movement between habitats required for different ontogenic stages. Recruitment of the European eel (Anguilla anguilla) has reduced by over 90% since the early 1980's, in part due to the effect of riverine barriers on its catadromous migration. There is a legislative requirement to restore free passage, increase habitat availability, and limit anthropogenic losses at intakes to aid eel recovery and good ecological status; necessitating an improved understanding of underlying processes. Escapement, route choice, delay at structures, and entrainment at water abstraction points of downstream migrating silver eels were examined using acoustic and Passive Integrated Transponder (PIT) telemetry in the heavily regulated lower river Stour, UK. Downstream migrating adult eel (n = 69) were trapped approximately 10 km upstream of the tidal limit, surgically implanted with an acoustic transducer and PIT transponder, and released between October and December in 2009 and 2010. Movements of tagged individuals were monitored by a linear array of 19 fixed acoustic receivers extending from the release site, through the last 9.2 km of the freshwater catchment. Three groups of water control structures, two water abstraction intakes and several possible routes of migration are present in the reach. Seventy six and 65% of tagged eels escaped from the study reach in 2009 and 2010, respectively. Entrainment at a single intake was the principal cause of loss and positively related to rapid increases in abstraction whilst eels were in the vicinity of the intake. Route choice into the estuary was dependent on discharge over a large intertidal weir; opening regimes of a tidal gate at the termination of the alternative channel; and abstraction rate at a nearby water intake. Long delays (up to 68.5 days) and recurrent behaviour were associated with several structures in the study reach; high variability between individuals reflected the management of ... |
format |
Article in Journal/Newspaper |
author |
Piper, Adam T. Wright, Ros Walker, Alan Kemp, P.S. |
spellingShingle |
Piper, Adam T. Wright, Ros Walker, Alan Kemp, P.S. Escapement, route choice, barrier passage and entrainment of seaward migrating European eel, Anguilla anguilla, within a highly regulated lowland river |
author_facet |
Piper, Adam T. Wright, Ros Walker, Alan Kemp, P.S. |
author_sort |
Piper, Adam T. |
title |
Escapement, route choice, barrier passage and entrainment of seaward migrating European eel, Anguilla anguilla, within a highly regulated lowland river |
title_short |
Escapement, route choice, barrier passage and entrainment of seaward migrating European eel, Anguilla anguilla, within a highly regulated lowland river |
title_full |
Escapement, route choice, barrier passage and entrainment of seaward migrating European eel, Anguilla anguilla, within a highly regulated lowland river |
title_fullStr |
Escapement, route choice, barrier passage and entrainment of seaward migrating European eel, Anguilla anguilla, within a highly regulated lowland river |
title_full_unstemmed |
Escapement, route choice, barrier passage and entrainment of seaward migrating European eel, Anguilla anguilla, within a highly regulated lowland river |
title_sort |
escapement, route choice, barrier passage and entrainment of seaward migrating european eel, anguilla anguilla, within a highly regulated lowland river |
publishDate |
2013 |
url |
https://eprints.soton.ac.uk/353278/ https://eprints.soton.ac.uk/353278/1/Piper_2013_escapement_eprints.pdf |
long_lat |
ENVELOPE(177.167,177.167,-84.983,-84.983) |
geographic |
Weir |
geographic_facet |
Weir |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_relation |
https://eprints.soton.ac.uk/353278/1/Piper_2013_escapement_eprints.pdf Piper, Adam T., Wright, Ros, Walker, Alan and Kemp, P.S. (2013) Escapement, route choice, barrier passage and entrainment of seaward migrating European eel, Anguilla anguilla, within a highly regulated lowland river. Ecological Engineering, 57, 88-96. (doi:10.1016/j.ecoleng.2013.04.030 <http://dx.doi.org/10.1016/j.ecoleng.2013.04.030>). |
op_doi |
https://doi.org/10.1016/j.ecoleng.2013.04.030 |
container_title |
Ecological Engineering |
container_volume |
57 |
container_start_page |
88 |
op_container_end_page |
96 |
_version_ |
1772812099826745344 |