Effects of the Cardiff Bay tidal barrage on the abundance, ecology and behaviour of shelducks Tadorna tadorna
1. Closure of the Taff/Ely Estuary by the Cardiff Bay barrage in 1999 resulted in the replacement of intertidal mudflats by a permanent freshwater lake. This led to an 89% reduction in the population of shelducks Tadorna tadorna. 2. The birds switched from foraging mainly for Nereis diversicolor and...
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| Veröffentlicht in: | Aquatic conservation 2009-06, Vol.19 (4), p.466-473 |
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| creator | Ferns, Peter N. Reed, James P. |
| description | 1.
Closure of the Taff/Ely Estuary by the Cardiff Bay barrage in 1999 resulted in the replacement of intertidal mudflats by a permanent freshwater lake. This led to an 89% reduction in the population of shelducks Tadorna tadorna.
2.
The birds switched from foraging mainly for Nereis diversicolor and Hydrobia ulvae by scything with the bill as they walked across the mudflats at low tide, to feeding on benthic chironomid midge larvae while swimming in shallow water around the margins of the lake.
3.
The population decline occurred as a consequence of a decrease in the area available for foraging — from about 1 km2 of mudflats to about 0.1 km2 of water shallow enough for shelducks to reach the bottom when dabbling, head dipping and upending.
4.
Contrary to expectation, the amount of time shelducks spent feeding was similar pre‐ and post‐barrage, and their body and plumage condition improved.
5.
A tidal rhythm in activity persisted, with a reduced amount of feeding at high tide, probably because of the slight rise in water levels that sometimes occurred at this time.
Copyright © 2008 John Wiley & Sons, Ltd. |
| doi_str_mv | 10.1002/aqc.1011 |
| format | Article |
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Closure of the Taff/Ely Estuary by the Cardiff Bay barrage in 1999 resulted in the replacement of intertidal mudflats by a permanent freshwater lake. This led to an 89% reduction in the population of shelducks Tadorna tadorna.
2.
The birds switched from foraging mainly for Nereis diversicolor and Hydrobia ulvae by scything with the bill as they walked across the mudflats at low tide, to feeding on benthic chironomid midge larvae while swimming in shallow water around the margins of the lake.
3.
The population decline occurred as a consequence of a decrease in the area available for foraging — from about 1 km2 of mudflats to about 0.1 km2 of water shallow enough for shelducks to reach the bottom when dabbling, head dipping and upending.
4.
Contrary to expectation, the amount of time shelducks spent feeding was similar pre‐ and post‐barrage, and their body and plumage condition improved.
5.
A tidal rhythm in activity persisted, with a reduced amount of feeding at high tide, probably because of the slight rise in water levels that sometimes occurred at this time.
Copyright © 2008 John Wiley & Sons, Ltd.</description><identifier>ISSN: 1052-7613</identifier><identifier>EISSN: 1099-0755</identifier><identifier>DOI: 10.1002/aqc.1011</identifier><language>eng</language><publisher>Chichester, UK: John Wiley & Sons, Ltd</publisher><subject>Animal, plant and microbial ecology ; Applied ecology ; Biological and medical sciences ; Brackish ; Conservation, protection and management of environment and wildlife ; Fundamental and applied biological sciences. Psychology ; General aspects ; Hydrobia ulvae ; Marine ; Nereis diversicolor ; Parks, reserves, wildlife conservation. Endangered species: population survey and restocking ; shelduck abundance ; Tadorna tadorna ; tidal barrage ; time budget</subject><ispartof>Aquatic conservation, 2009-06, Vol.19 (4), p.466-473</ispartof><rights>Copyright © 2008 John Wiley & Sons, Ltd.</rights><rights>2009 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3641-1a1d9a809a4bda0faf6852eba2a9e8ce8b780823ea02ebef327b0993885c184a3</citedby><cites>FETCH-LOGICAL-c3641-1a1d9a809a4bda0faf6852eba2a9e8ce8b780823ea02ebef327b0993885c184a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Faqc.1011$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Faqc.1011$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1416,27922,27923,45572,45573</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21507464$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Ferns, Peter N.</creatorcontrib><creatorcontrib>Reed, James P.</creatorcontrib><title>Effects of the Cardiff Bay tidal barrage on the abundance, ecology and behaviour of shelducks Tadorna tadorna</title><title>Aquatic conservation</title><addtitle>Aquatic Conserv: Mar. Freshw. Ecosyst</addtitle><description>1.
Closure of the Taff/Ely Estuary by the Cardiff Bay barrage in 1999 resulted in the replacement of intertidal mudflats by a permanent freshwater lake. This led to an 89% reduction in the population of shelducks Tadorna tadorna.
2.
The birds switched from foraging mainly for Nereis diversicolor and Hydrobia ulvae by scything with the bill as they walked across the mudflats at low tide, to feeding on benthic chironomid midge larvae while swimming in shallow water around the margins of the lake.
3.
The population decline occurred as a consequence of a decrease in the area available for foraging — from about 1 km2 of mudflats to about 0.1 km2 of water shallow enough for shelducks to reach the bottom when dabbling, head dipping and upending.
4.
Contrary to expectation, the amount of time shelducks spent feeding was similar pre‐ and post‐barrage, and their body and plumage condition improved.
5.
A tidal rhythm in activity persisted, with a reduced amount of feeding at high tide, probably because of the slight rise in water levels that sometimes occurred at this time.
Copyright © 2008 John Wiley & Sons, Ltd.</description><subject>Animal, plant and microbial ecology</subject><subject>Applied ecology</subject><subject>Biological and medical sciences</subject><subject>Brackish</subject><subject>Conservation, protection and management of environment and wildlife</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>General aspects</subject><subject>Hydrobia ulvae</subject><subject>Marine</subject><subject>Nereis diversicolor</subject><subject>Parks, reserves, wildlife conservation. Endangered species: population survey and restocking</subject><subject>shelduck abundance</subject><subject>Tadorna tadorna</subject><subject>tidal barrage</subject><subject>time budget</subject><issn>1052-7613</issn><issn>1099-0755</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNp1kMtOwzAQRSMEEqUg8QnegFgQsJ2HnSVU5SUEQkBZWhNn3IamcWsnQP-elFbdsbpXo6MjzQ2CY0YvGKX8Eha6K4ztBD1GsyykIkl2Vz3hoUhZtB8ceP9JKc1SlvaC2dAY1I0n1pBmgmQAriiNIdewJE1ZQEVycA7GSGz9B0De1gXUGs8JalvZ8ZJAXZAcJ_BV2tatRH6CVdHqqSdvUFhXA2nWeRjsGag8Hm2yH7zfDN8Gd-Hj8-394Oox1FEas5ABKzKQNIM4L4AaMKlMOObAIUOpUeZCUskjBNpd0URc5N2vkZSJZjKGqB-crr1zZxct-kbNSq-xqqBG23rFqRRcMtGBZ2tQO-u9Q6PmrpyBWypG1WpP1e2pVnt26MnGCV5DZVw3Qum3PGcJFXEad1y45r7LCpf_-tTVy2Dj3fClb_Bny4ObqlREIlEfT7dqJB5e09FDrGj0C17iks8</recordid><startdate>200906</startdate><enddate>200906</enddate><creator>Ferns, Peter N.</creator><creator>Reed, James P.</creator><general>John Wiley & Sons, Ltd</general><general>Wiley</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7SN</scope><scope>7ST</scope><scope>7TN</scope><scope>7U6</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H95</scope><scope>H97</scope><scope>L.G</scope><scope>SOI</scope></search><sort><creationdate>200906</creationdate><title>Effects of the Cardiff Bay tidal barrage on the abundance, ecology and behaviour of shelducks Tadorna tadorna</title><author>Ferns, Peter N. ; Reed, James P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3641-1a1d9a809a4bda0faf6852eba2a9e8ce8b780823ea02ebef327b0993885c184a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Animal, plant and microbial ecology</topic><topic>Applied ecology</topic><topic>Biological and medical sciences</topic><topic>Brackish</topic><topic>Conservation, protection and management of environment and wildlife</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>General aspects</topic><topic>Hydrobia ulvae</topic><topic>Marine</topic><topic>Nereis diversicolor</topic><topic>Parks, reserves, wildlife conservation. Endangered species: population survey and restocking</topic><topic>shelduck abundance</topic><topic>Tadorna tadorna</topic><topic>tidal barrage</topic><topic>time budget</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ferns, Peter N.</creatorcontrib><creatorcontrib>Reed, James P.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aqualine</collection><collection>Ecology Abstracts</collection><collection>Environment Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Sustainability Science Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 3: Aquatic Pollution & Environmental Quality</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Environment Abstracts</collection><jtitle>Aquatic conservation</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ferns, Peter N.</au><au>Reed, James P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effects of the Cardiff Bay tidal barrage on the abundance, ecology and behaviour of shelducks Tadorna tadorna</atitle><jtitle>Aquatic conservation</jtitle><addtitle>Aquatic Conserv: Mar. Freshw. Ecosyst</addtitle><date>2009-06</date><risdate>2009</risdate><volume>19</volume><issue>4</issue><spage>466</spage><epage>473</epage><pages>466-473</pages><issn>1052-7613</issn><eissn>1099-0755</eissn><abstract>1.
Closure of the Taff/Ely Estuary by the Cardiff Bay barrage in 1999 resulted in the replacement of intertidal mudflats by a permanent freshwater lake. This led to an 89% reduction in the population of shelducks Tadorna tadorna.
2.
The birds switched from foraging mainly for Nereis diversicolor and Hydrobia ulvae by scything with the bill as they walked across the mudflats at low tide, to feeding on benthic chironomid midge larvae while swimming in shallow water around the margins of the lake.
3.
The population decline occurred as a consequence of a decrease in the area available for foraging — from about 1 km2 of mudflats to about 0.1 km2 of water shallow enough for shelducks to reach the bottom when dabbling, head dipping and upending.
4.
Contrary to expectation, the amount of time shelducks spent feeding was similar pre‐ and post‐barrage, and their body and plumage condition improved.
5.
A tidal rhythm in activity persisted, with a reduced amount of feeding at high tide, probably because of the slight rise in water levels that sometimes occurred at this time.
Copyright © 2008 John Wiley & Sons, Ltd.</abstract><cop>Chichester, UK</cop><pub>John Wiley & Sons, Ltd</pub><doi>10.1002/aqc.1011</doi><tpages>8</tpages></addata></record> |
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| subjects | Animal, plant and microbial ecology Applied ecology Biological and medical sciences Brackish Conservation, protection and management of environment and wildlife Fundamental and applied biological sciences. Psychology General aspects Hydrobia ulvae Marine Nereis diversicolor Parks, reserves, wildlife conservation. Endangered species: population survey and restocking shelduck abundance Tadorna tadorna tidal barrage time budget |
| title | Effects of the Cardiff Bay tidal barrage on the abundance, ecology and behaviour of shelducks Tadorna tadorna |
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