Versatility of male Curlews Numenius arquata preying upon Nereis diversicolor::deploying contrasting capture modes dependent on prey availability
Curlews Numenius arquata use 2 methods to capture ragworms Nereis diversicolor they search for worms at the surface, which are taken with a single peck (called Npeck) and/or they search for visual cues, such as burrow entrances, and probe deep to extract the worm from the burrow (called Nprobe) Itis...
Published in: | Marine Ecology Progress Series |
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Format: | Article in Journal/Newspaper |
Language: | English |
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1989
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Online Access: | https://hdl.handle.net/11370/ba879115-48a7-4e2e-bbb3-8cad67954bc9 https://research.rug.nl/en/publications/ba879115-48a7-4e2e-bbb3-8cad67954bc9 https://doi.org/10.3354/meps056255 https://pure.rug.nl/ws/files/62554409/Versatility_of_male_curlews_Numenius_arquata.pdf |
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ftunigroningenpu:oai:pure.rug.nl:publications/ba879115-48a7-4e2e-bbb3-8cad67954bc9 2024-06-02T08:12:23+00:00 Versatility of male Curlews Numenius arquata preying upon Nereis diversicolor::deploying contrasting capture modes dependent on prey availability Zwarts, L Esselink, Peter 1989-08-24 application/pdf https://hdl.handle.net/11370/ba879115-48a7-4e2e-bbb3-8cad67954bc9 https://research.rug.nl/en/publications/ba879115-48a7-4e2e-bbb3-8cad67954bc9 https://doi.org/10.3354/meps056255 https://pure.rug.nl/ws/files/62554409/Versatility_of_male_curlews_Numenius_arquata.pdf eng eng https://research.rug.nl/en/publications/ba879115-48a7-4e2e-bbb3-8cad67954bc9 info:eu-repo/semantics/openAccess Zwarts , L & Esselink , P 1989 , ' Versatility of male Curlews Numenius arquata preying upon Nereis diversicolor: deploying contrasting capture modes dependent on prey availability ' , Marine Ecology Progress Series , vol. 56 , no. 3 , pp. 255-269 . https://doi.org/10.3354/meps056255 article 1989 ftunigroningenpu https://doi.org/10.3354/meps056255 2024-05-07T19:07:14Z Curlews Numenius arquata use 2 methods to capture ragworms Nereis diversicolor they search for worms at the surface, which are taken with a single peck (called Npeck) and/or they search for visual cues, such as burrow entrances, and probe deep to extract the worm from the burrow (called Nprobe) Itis argued that male curlews select predominantly active worms, which are either grazing at the surface (Npeck) or are filter feeding within their burrows (Nprobe and sometimes Npeck). Profitability (mg S-' handling) increases with worm length and is greater for NPeck, because of its shorter handling time, than for NP,,&. Worms of both prey types I ca 6 cm are ignored, since profitability is below the intake rate (mg S-' feeding). During low water there is a shift from Nprobe to Npeck, which can be explained by changes in feeding behaviour of the worms. Nprobe, common in summer, disappears during autumn due to the increase of burrow depth (with the corresponding decrease of worms accessible as Nprobe), and to a reduction in filter feeding of the worm, which means that fewer traces are visible. Curlew search rate increases if, relatively, many prey are of the Nperk type. There appears to be a tradeoff between search rate and probab~lity of detection of conspicuous Npeck and cryptic Nprobe. NO evidence was found that curlews ignore one prey type and selectively search for the other We conclude that (1) unprofitable prey sizes are ignored, (2) the greater part of the profitable prey are not available. being hidden in the substrate and n~ostly not accessible even when detectable, (3) curlews continuously readjust their capture technique to changes in the available food supply. Article in Journal/Newspaper Numenius arquata University of Groningen research database Burrows ENVELOPE(163.650,163.650,-74.300,-74.300) Marine Ecology Progress Series 56 255 269 |
institution |
Open Polar |
collection |
University of Groningen research database |
op_collection_id |
ftunigroningenpu |
language |
English |
description |
Curlews Numenius arquata use 2 methods to capture ragworms Nereis diversicolor they search for worms at the surface, which are taken with a single peck (called Npeck) and/or they search for visual cues, such as burrow entrances, and probe deep to extract the worm from the burrow (called Nprobe) Itis argued that male curlews select predominantly active worms, which are either grazing at the surface (Npeck) or are filter feeding within their burrows (Nprobe and sometimes Npeck). Profitability (mg S-' handling) increases with worm length and is greater for NPeck, because of its shorter handling time, than for NP,,&. Worms of both prey types I ca 6 cm are ignored, since profitability is below the intake rate (mg S-' feeding). During low water there is a shift from Nprobe to Npeck, which can be explained by changes in feeding behaviour of the worms. Nprobe, common in summer, disappears during autumn due to the increase of burrow depth (with the corresponding decrease of worms accessible as Nprobe), and to a reduction in filter feeding of the worm, which means that fewer traces are visible. Curlew search rate increases if, relatively, many prey are of the Nperk type. There appears to be a tradeoff between search rate and probab~lity of detection of conspicuous Npeck and cryptic Nprobe. NO evidence was found that curlews ignore one prey type and selectively search for the other We conclude that (1) unprofitable prey sizes are ignored, (2) the greater part of the profitable prey are not available. being hidden in the substrate and n~ostly not accessible even when detectable, (3) curlews continuously readjust their capture technique to changes in the available food supply. |
format |
Article in Journal/Newspaper |
author |
Zwarts, L Esselink, Peter |
spellingShingle |
Zwarts, L Esselink, Peter Versatility of male Curlews Numenius arquata preying upon Nereis diversicolor::deploying contrasting capture modes dependent on prey availability |
author_facet |
Zwarts, L Esselink, Peter |
author_sort |
Zwarts, L |
title |
Versatility of male Curlews Numenius arquata preying upon Nereis diversicolor::deploying contrasting capture modes dependent on prey availability |
title_short |
Versatility of male Curlews Numenius arquata preying upon Nereis diversicolor::deploying contrasting capture modes dependent on prey availability |
title_full |
Versatility of male Curlews Numenius arquata preying upon Nereis diversicolor::deploying contrasting capture modes dependent on prey availability |
title_fullStr |
Versatility of male Curlews Numenius arquata preying upon Nereis diversicolor::deploying contrasting capture modes dependent on prey availability |
title_full_unstemmed |
Versatility of male Curlews Numenius arquata preying upon Nereis diversicolor::deploying contrasting capture modes dependent on prey availability |
title_sort |
versatility of male curlews numenius arquata preying upon nereis diversicolor::deploying contrasting capture modes dependent on prey availability |
publishDate |
1989 |
url |
https://hdl.handle.net/11370/ba879115-48a7-4e2e-bbb3-8cad67954bc9 https://research.rug.nl/en/publications/ba879115-48a7-4e2e-bbb3-8cad67954bc9 https://doi.org/10.3354/meps056255 https://pure.rug.nl/ws/files/62554409/Versatility_of_male_curlews_Numenius_arquata.pdf |
long_lat |
ENVELOPE(163.650,163.650,-74.300,-74.300) |
geographic |
Burrows |
geographic_facet |
Burrows |
genre |
Numenius arquata |
genre_facet |
Numenius arquata |
op_source |
Zwarts , L & Esselink , P 1989 , ' Versatility of male Curlews Numenius arquata preying upon Nereis diversicolor: deploying contrasting capture modes dependent on prey availability ' , Marine Ecology Progress Series , vol. 56 , no. 3 , pp. 255-269 . https://doi.org/10.3354/meps056255 |
op_relation |
https://research.rug.nl/en/publications/ba879115-48a7-4e2e-bbb3-8cad67954bc9 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3354/meps056255 |
container_title |
Marine Ecology Progress Series |
container_volume |
56 |
container_start_page |
255 |
op_container_end_page |
269 |
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1800758788086562816 |