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Response of macrofauna to drifting tidal sediments

R Zühlke, K Reise, Ruth Callaway

Helgoländer Meeresuntersuchungen, Volume: 48, Issue: 2-3, Pages: 277 - 289

Swansea University Author: Ruth Callaway

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DOI (Published version): 10.1007/BF02367041

Abstract

The effect of hydrodynamically-mobilized sediment on abundance and vertical distribution of macrobenthic fauna was studied in Königshafen, a sheltered tidal bay at the northern end of the Island of Sylt (North Sea). Sediment drift tended to increase from high towards low tide level, while abundance...

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Published in: Helgoländer Meeresuntersuchungen
ISSN: 0174-3597 1438-3888
Published: 1994
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URI: https://cronfa.swan.ac.uk/Record/cronfa13092
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spelling 2019-06-12T16:50:58.6604577 v2 13092 2012-10-16 Response of macrofauna to drifting tidal sediments 61d7fe28cbb286de1c9c43f45014c490 Ruth Callaway Ruth Callaway true false 2012-10-16 FGSEN The effect of hydrodynamically-mobilized sediment on abundance and vertical distribution of macrobenthic fauna was studied in Königshafen, a sheltered tidal bay at the northern end of the Island of Sylt (North Sea). Sediment drift tended to increase from high towards low tide level, while abundance of nearly all species decreased (with the polychaeteSpio filicornis as a notable exception). To test whether this decrease could be attributed to water currents affecting sediment stability, experimental flumes with funnels at both ends were set up to enhance sediment mobility by increasing tidal current velocities. Abundance and vertical distribution of fauna inside and outside the flumes were compared. Responses of individual species depended on their vertical position in the sediment, and resembled those observed along the gradient of sediment drift between high and low tide levels. Mainly juveniles ofPygospio elegans, Scoloplos armiger, Hydrobia ulvae andMacoma balthica, and the small polychaeteMicrophthalmus sczelkowii were washed out of the sediment. No effect of increased erosion inside the flume was found on the numbers ofCapitella capitata and the oligochaetesTubificoides benedii andT. pseudogaster. These oligochaetes probably migrated downwards with increasing erosion in the flumes. Numbers decreased in the upper cm and tended to increase below. A storm had a similar effect on oligochaete vertical distribution, while under conditions of permanently high sediment mobility near low tide level, these species were rare or absent. It is concluded that even under sheltered conditions, differential degrees of sediment mobility may have effects on the zonation of the tidal flat macrofauna. Journal Article Helgoländer Meeresuntersuchungen 48 2-3 277 289 0174-3597 1438-3888 30 6 1994 1994-06-30 10.1007/BF02367041 http://www.springerlink.com/content/av034204tr574842/ COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2019-06-12T16:50:58.6604577 2012-10-16T19:41:56.7393001 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences R Zühlke 1 K Reise 2 Ruth Callaway 3
title Response of macrofauna to drifting tidal sediments
spellingShingle Response of macrofauna to drifting tidal sediments
Ruth Callaway
title_short Response of macrofauna to drifting tidal sediments
title_full Response of macrofauna to drifting tidal sediments
title_fullStr Response of macrofauna to drifting tidal sediments
title_full_unstemmed Response of macrofauna to drifting tidal sediments
title_sort Response of macrofauna to drifting tidal sediments
author_id_str_mv 61d7fe28cbb286de1c9c43f45014c490
author_id_fullname_str_mv 61d7fe28cbb286de1c9c43f45014c490_***_Ruth Callaway
author Ruth Callaway
author2 R Zühlke
K Reise
Ruth Callaway
format Journal article
container_title Helgoländer Meeresuntersuchungen
container_volume 48
container_issue 2-3
container_start_page 277
publishDate 1994
institution Swansea University
issn 0174-3597
1438-3888
doi_str_mv 10.1007/BF02367041
college_str Faculty of Science and Engineering
hierarchytype
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
url http://www.springerlink.com/content/av034204tr574842/
document_store_str 0
active_str 0
description The effect of hydrodynamically-mobilized sediment on abundance and vertical distribution of macrobenthic fauna was studied in Königshafen, a sheltered tidal bay at the northern end of the Island of Sylt (North Sea). Sediment drift tended to increase from high towards low tide level, while abundance of nearly all species decreased (with the polychaeteSpio filicornis as a notable exception). To test whether this decrease could be attributed to water currents affecting sediment stability, experimental flumes with funnels at both ends were set up to enhance sediment mobility by increasing tidal current velocities. Abundance and vertical distribution of fauna inside and outside the flumes were compared. Responses of individual species depended on their vertical position in the sediment, and resembled those observed along the gradient of sediment drift between high and low tide levels. Mainly juveniles ofPygospio elegans, Scoloplos armiger, Hydrobia ulvae andMacoma balthica, and the small polychaeteMicrophthalmus sczelkowii were washed out of the sediment. No effect of increased erosion inside the flume was found on the numbers ofCapitella capitata and the oligochaetesTubificoides benedii andT. pseudogaster. These oligochaetes probably migrated downwards with increasing erosion in the flumes. Numbers decreased in the upper cm and tended to increase below. A storm had a similar effect on oligochaete vertical distribution, while under conditions of permanently high sediment mobility near low tide level, these species were rare or absent. It is concluded that even under sheltered conditions, differential degrees of sediment mobility may have effects on the zonation of the tidal flat macrofauna.
published_date 1994-06-30T03:15:00Z
_version_ 1763750235651178496
score 11.013148

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