AustralieFrV1, PascalFrancis, Curation, bibRecord, 002F89

Determinants of dietary specialization : a comparison of two sympatric species of sea snakes

Identifieur interne : 002F89 ( PascalFrancis/Curation ); précédent : 002F88; suivant : 002F90

Determinants of dietary specialization : a comparison of two sympatric species of sea snakes

Auteurs : Francois Brischoux [France] ; Xavier Bonnet [France] ; Richard Shine [Australie]

Source :

Oikos [ 0030-1299 ] ; 2009.

RBID : Pascal:09-0081728

Descripteurs français

Pascal (Inist)
- Régime alimentaire, Spécialisation, Sympatrie, Prédateur, Proie, Développement, Taille corporelle, Portée, Modèle, Test hypothèse, Ecologie, Habitat, Nouvelle Calédonie, Substrat meuble, Ophidia, Laticauda saintgironsi.
Wicri :
- topic : Habitat.

English descriptors

KwdEn :
- Body size, Development, Diet, Ecology, Habitat, Hypothesis test, Models, New Caledonia, Ophidia, Predator, Prey, Soft substrate, Span, Specialization, Sympatry.

Abstract

Why do some predator species specialize on only a single type of prey whereas others take a broad range? One critical determinant may be the ontogenetic range of body sizes of the predator compared to that of its prey. If any single prey taxon spans only part of the range of prey sizes ingestible by the predator, then the predator will be more likely to take multiple prey taxa. We exploit a model system that provides a robust opportunity to test this hypothesis. We studied two sympatric species of predatory sea snakes, similar in size and general ecology that feed on anguilliform fishes from different habitats in the Great Lagoon of New Caledonia. Eel species from soft-bottom habitats must construct their own burrows, and thus tend to be more slender-bodied and less variable in body size than eel species that inhabit variable-sized crevices among hard coral. As a result, a laticaudine sea snake species (Laticauda saintgironsi) that feeds on hard-coral-dwelling eels relies primarily on a single prey species: juveniles take young eels whereas adults consume adult eels of the same species. In contrast, a laticaudine species (L. laticaudata) that forages on soft-bottom eels switches its prey ontogenetically: juveniles take small eel species whereas adults consume large eel species. Thus, habitat-imposed constraints on the range of body sizes within each prey taxon generate a striking difference in the degree of dietary specialization of two closely related, sympatric predator species.

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C03	`08`	`X`	`FRE`	`@0 Portée @5 08`
C03	`08`	`X`	`ENG`	`@0 Span @5 08`
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C03	`13`	`X`	`FRE`	`@0 Nouvelle Calédonie @2 NG @5 14`
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C03	`14`	`X`	`SPA`	`@0 Substrato blando @5 16`
C03	`15`	`X`	`FRE`	`@0 Ophidia @2 NS @5 49`
C03	`15`	`X`	`ENG`	`@0 Ophidia @2 NS @5 49`
C03	`15`	`X`	`SPA`	`@0 Ophidia @2 NS @5 49`
C03	`16`	`X`	`FRE`	`@0 Laticauda saintgironsi @4 INC @5 64`
C07	`01`	`X`	`FRE`	`@0 Mélanésie @2 NG`
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C07	`03`	`X`	`FRE`	`@0 Alimentation @5 17`
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N21				`@1 061`

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Why do some predator species specialize on only a single type of prey whereas others take a broad range? One critical determinant may be the ontogenetic range of body sizes of the predator compared to that of its prey. If any single prey taxon spans only part of the range of prey sizes ingestible by the predator, then the predator will be more likely to take multiple prey taxa. We exploit a model system that provides a robust opportunity to test this hypothesis. We studied two sympatric species of predatory sea snakes, similar in size and general ecology that feed on anguilliform fishes from different habitats in the Great Lagoon of New Caledonia. Eel species from soft-bottom habitats must construct their own burrows, and thus tend to be more slender-bodied and less variable in body size than eel species that inhabit variable-sized crevices among hard coral. As a result, a laticaudine sea snake species (Laticauda saintgironsi) that feeds on hard-coral-dwelling eels relies primarily on a single prey species: juveniles take young eels whereas adults consume adult eels of the same species. In contrast, a laticaudine species (L. laticaudata) that forages on soft-bottom eels switches its prey ontogenetically: juveniles take small eel species whereas adults consume large eel species. Thus, habitat-imposed constraints on the range of body sizes within each prey taxon generate a striking difference in the degree of dietary specialization of two closely related, sympatric predator species.</div>
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<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Body size</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Talla corporal</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Portée</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Span</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Alcance</s0>
<s5>08</s5>
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<s5>09</s5>
</fC03>
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<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Modelo</s0>
<s5>09</s5>
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<fC03 i1="10" i2="X" l="FRE"><s0>Test hypothèse</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Hypothesis test</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Test hipótesis</s0>
<s5>10</s5>
</fC03>
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<s5>11</s5>
</fC03>
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<s5>11</s5>
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<fC03 i1="11" i2="X" l="SPA"><s0>Ecología</s0>
<s5>11</s5>
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<s5>13</s5>
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<fC03 i1="12" i2="X" l="ENG"><s0>Habitat</s0>
<s5>13</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Habitat</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE"><s0>Nouvelle Calédonie</s0>
<s2>NG</s2>
<s5>14</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG"><s0>New Caledonia</s0>
<s2>NG</s2>
<s5>14</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA"><s0>Nueva Caledonia</s0>
<s2>NG</s2>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE"><s0>Substrat meuble</s0>
<s5>16</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG"><s0>Soft substrate</s0>
<s5>16</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA"><s0>Substrato blando</s0>
<s5>16</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE"><s0>Ophidia</s0>
<s2>NS</s2>
<s5>49</s5>
</fC03>
<fC03 i1="15" i2="X" l="ENG"><s0>Ophidia</s0>
<s2>NS</s2>
<s5>49</s5>
</fC03>
<fC03 i1="15" i2="X" l="SPA"><s0>Ophidia</s0>
<s2>NS</s2>
<s5>49</s5>
</fC03>
<fC03 i1="16" i2="X" l="FRE"><s0>Laticauda saintgironsi</s0>
<s4>INC</s4>
<s5>64</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE"><s0>Mélanésie</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="X" l="ENG"><s0>Melanesia</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="X" l="SPA"><s0>Melanesia</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="X" l="FRE"><s0>Océanie</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="X" l="ENG"><s0>Oceania</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="X" l="SPA"><s0>Oceania</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="03" i2="X" l="FRE"><s0>Alimentation</s0>
<s5>17</s5>
</fC07>
<fC07 i1="03" i2="X" l="ENG"><s0>Feeding</s0>
<s5>17</s5>
</fC07>
<fC07 i1="03" i2="X" l="SPA"><s0>Alimentación</s0>
<s5>17</s5>
</fC07>
<fC07 i1="04" i2="X" l="FRE"><s0>Biométrie corporelle</s0>
<s5>18</s5>
</fC07>
<fC07 i1="04" i2="X" l="ENG"><s0>Corporal biometry</s0>
<s5>18</s5>
</fC07>
<fC07 i1="04" i2="X" l="SPA"><s0>Biometría corporal</s0>
<s5>18</s5>
</fC07>
<fC07 i1="05" i2="X" l="FRE"><s0>Reptilia</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="05" i2="X" l="ENG"><s0>Reptilia</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="05" i2="X" l="SPA"><s0>Reptilia</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="06" i2="X" l="FRE"><s0>Vertebrata</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="06" i2="X" l="ENG"><s0>Vertebrata</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="06" i2="X" l="SPA"><s0>Vertebrata</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="07" i2="X" l="FRE"><s0>Elapidae</s0>
<s4>INC</s4>
<s5>70</s5>
</fC07>
<fN21><s1>061</s1>
</fN21>
</pA>
</standard>
</inist>
</record>

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   |area=    AustralieFrV1
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   |texte=   Determinants of dietary specialization : a comparison of two sympatric species of sea snakes
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	Serveur d'exploration sur les relations entre la France et l'Australie
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Determinants of dietary specialization : a comparison of two sympatric species of sea snakes

Determinants of dietary specialization : a comparison of two sympatric species of sea snakes

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