Diet specialisation and foraging efficiency under fluctuating vole abundance: a comparison between generalist and specialist avian predators
Identifieur interne : 000091 ( Main/Exploration ); précédent : 000090; suivant : 000092Diet specialisation and foraging efficiency under fluctuating vole abundance: a comparison between generalist and specialist avian predators
Auteurs : Julien Terraube [Royaume-Uni] ; Beatriz Arroyo [Royaume-Uni] ; Mike Madders [Royaume-Uni] ; François Mougeot [Royaume-Uni]Source :
- Oikos [ 0030-1299 ] ; 2011-02.
Abstract
Specialist species, using a narrow range of resources, are predicted to be more efficient when foraging on their preferred food than generalist species consuming a wider range of foods. We tested whether the foraging efficiency of the pallid harrier Circus macrourus, a vole specialist, and of sympatric Montagu's harriers C. pygargus, a closely related generalist, differed in relation to inter‐annual variations in vole abundance over five years (including two peak‐ one intermediate and two low vole abundance years). We show that the hunting parameters of pallid harriers strongly varied with vole abundance (higher encounter rates, capture rates and proportion of successful strikes in high than intermediate and low vole abundance years, respectively), whereas Montagu's harriers showed stable capture rates and hunting success (proportion of strikes that were successful), irrespective of vole abundance. Encounter rates and capture rates were higher for pallid than for Montagu's harriers when voles were abundant, but lower when voles were scarce. The hunting success of pallid harriers was also lower than that of Montagu's harriers when voles were scarce, and when they had to target alternative preys, in particular birds. Overall, estimated biomass intake rate was 40% higher for pallid harriers than for Montagu's harriers when voles were abundant, but 50% lower when voles were scarce. Our results indicate that specialists predators, like pallid harriers, which evolve specific adaptations or breeding strategies, do better when their preferred prey is abundant, but may face a cost of specialisation, being not efficient enough when their preferred prey is scarce. These results have broader implications for understanding why specialist predators are, in general, more vulnerable than generalists, and for predicting how specialists can cope with rapid environmental changes affecting the abundance or predictability of their preferred resources.
Url:
DOI: 10.1111/j.1600-0706.2010.18554.x
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Diet specialisation and foraging efficiency under fluctuating vole abundance: a comparison between generalist and specialist avian predators</title>
<author><name sortKey="Terraube, Julien" sort="Terraube, Julien" uniqKey="Terraube J" first="Julien" last="Terraube">Julien Terraube</name>
</author>
<author><name sortKey="Arroyo, Beatriz" sort="Arroyo, Beatriz" uniqKey="Arroyo B" first="Beatriz" last="Arroyo">Beatriz Arroyo</name>
</author>
<author><name sortKey="Madders, Mike" sort="Madders, Mike" uniqKey="Madders M" first="Mike" last="Madders">Mike Madders</name>
</author>
<author><name sortKey="Mougeot, Francois" sort="Mougeot, Francois" uniqKey="Mougeot F" first="François" last="Mougeot">François Mougeot</name>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">ISTEX</idno>
<idno type="RBID">ISTEX:E01773335F1B9C9E950989B290968A60C6E57260</idno>
<date when="2011" year="2011">2011</date>
<idno type="doi">10.1111/j.1600-0706.2010.18554.x</idno>
<idno type="url">https://api.istex.fr/document/E01773335F1B9C9E950989B290968A60C6E57260/fulltext/pdf</idno>
<idno type="wicri:Area/Main/Corpus">000A49</idno>
<idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="ISTEX">000A49</idno>
<idno type="wicri:Area/Main/Curation">000A49</idno>
<idno type="wicri:Area/Main/Exploration">000091</idno>
<idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Exploration">000091</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Diet specialisation and foraging efficiency under fluctuating vole abundance: a comparison between generalist and specialist avian predators</title>
<author><name sortKey="Terraube, Julien" sort="Terraube, Julien" uniqKey="Terraube J" first="Julien" last="Terraube">Julien Terraube</name>
<affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country>
<wicri:regionArea>Natural Research Ltd, Hill of Brathens, Glassel, Banchory, AB31 4BY</wicri:regionArea>
<wicri:noRegion>AB31 4BY</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Arroyo, Beatriz" sort="Arroyo, Beatriz" uniqKey="Arroyo B" first="Beatriz" last="Arroyo">Beatriz Arroyo</name>
<affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country>
<wicri:regionArea>Natural Research Ltd, Hill of Brathens, Glassel, Banchory, AB31 4BY</wicri:regionArea>
<wicri:noRegion>AB31 4BY</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Madders, Mike" sort="Madders, Mike" uniqKey="Madders M" first="Mike" last="Madders">Mike Madders</name>
<affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country>
<wicri:regionArea>Natural Research Ltd, Hill of Brathens, Glassel, Banchory, AB31 4BY</wicri:regionArea>
<wicri:noRegion>AB31 4BY</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Mougeot, Francois" sort="Mougeot, Francois" uniqKey="Mougeot F" first="François" last="Mougeot">François Mougeot</name>
<affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country>
<wicri:regionArea>Natural Research Ltd, Hill of Brathens, Glassel, Banchory, AB31 4BY</wicri:regionArea>
<wicri:noRegion>AB31 4BY</wicri:noRegion>
</affiliation>
</author>
</analytic>
<monogr></monogr>
<series><title level="j">Oikos</title>
<title level="j" type="abbrev">Oikos</title>
<idno type="ISSN">0030-1299</idno>
<idno type="eISSN">1600-0706</idno>
<imprint><publisher>Blackwell Publishing Ltd</publisher>
<pubPlace>Oxford, UK</pubPlace>
<date type="published" when="2011-02">2011-02</date>
<biblScope unit="vol">120</biblScope>
<biblScope unit="issue">2</biblScope>
<biblScope unit="page" from="234">234</biblScope>
<biblScope unit="page" to="244">244</biblScope>
</imprint>
<idno type="ISSN">0030-1299</idno>
</series>
<idno type="istex">E01773335F1B9C9E950989B290968A60C6E57260</idno>
<idno type="DOI">10.1111/j.1600-0706.2010.18554.x</idno>
<idno type="ArticleID">OIK18554</idno>
</biblStruct>
</sourceDesc>
<seriesStmt><idno type="ISSN">0030-1299</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass></textClass>
<langUsage><language ident="en">en</language>
</langUsage>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">Specialist species, using a narrow range of resources, are predicted to be more efficient when foraging on their preferred food than generalist species consuming a wider range of foods. We tested whether the foraging efficiency of the pallid harrier Circus macrourus, a vole specialist, and of sympatric Montagu's harriers C. pygargus, a closely related generalist, differed in relation to inter‐annual variations in vole abundance over five years (including two peak‐ one intermediate and two low vole abundance years). We show that the hunting parameters of pallid harriers strongly varied with vole abundance (higher encounter rates, capture rates and proportion of successful strikes in high than intermediate and low vole abundance years, respectively), whereas Montagu's harriers showed stable capture rates and hunting success (proportion of strikes that were successful), irrespective of vole abundance. Encounter rates and capture rates were higher for pallid than for Montagu's harriers when voles were abundant, but lower when voles were scarce. The hunting success of pallid harriers was also lower than that of Montagu's harriers when voles were scarce, and when they had to target alternative preys, in particular birds. Overall, estimated biomass intake rate was 40% higher for pallid harriers than for Montagu's harriers when voles were abundant, but 50% lower when voles were scarce. Our results indicate that specialists predators, like pallid harriers, which evolve specific adaptations or breeding strategies, do better when their preferred prey is abundant, but may face a cost of specialisation, being not efficient enough when their preferred prey is scarce. These results have broader implications for understanding why specialist predators are, in general, more vulnerable than generalists, and for predicting how specialists can cope with rapid environmental changes affecting the abundance or predictability of their preferred resources.</div>
</front>
</TEI>
<affiliations><list><country><li>Royaume-Uni</li>
</country>
</list>
<tree><country name="Royaume-Uni"><noRegion><name sortKey="Terraube, Julien" sort="Terraube, Julien" uniqKey="Terraube J" first="Julien" last="Terraube">Julien Terraube</name>
</noRegion>
<name sortKey="Arroyo, Beatriz" sort="Arroyo, Beatriz" uniqKey="Arroyo B" first="Beatriz" last="Arroyo">Beatriz Arroyo</name>
<name sortKey="Madders, Mike" sort="Madders, Mike" uniqKey="Madders M" first="Mike" last="Madders">Mike Madders</name>
<name sortKey="Mougeot, Francois" sort="Mougeot, Francois" uniqKey="Mougeot F" first="François" last="Mougeot">François Mougeot</name>
</country>
</tree>
</affiliations>
</record>
Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Wicri/explor/CircusV2/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000091 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 000091 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien |wiki= Wicri/Wicri |area= CircusV2 |flux= Main |étape= Exploration |type= RBID |clé= ISTEX:E01773335F1B9C9E950989B290968A60C6E57260 |texte= Diet specialisation and foraging efficiency under fluctuating vole abundance: a comparison between generalist and specialist avian predators }}
This area was generated with Dilib version V0.6.31. |