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Dejean, A.; Grangier, J.; Leroy, C.; Orivel, J. |
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Title |
Host plant protection by arboreal ants: looking for a pattern in locally induced responses |
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Journal Article |
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Year |
2008 |
Publication |
Evolutionary Ecology Research |
Abbreviated Journal |
Evol. Ecol. Res. |
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Volume |
10 |
Issue |
8 |
Pages |
1217-1223 |
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Keywords |
aggressiveness; ant-plant relationships; Azteca; biotic defence; induced responses |
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Background: Among arboreal ants, both territorially dominant species and plant-ants (e.g. species associated with myrmecophytes or plants housing them in hollow structures) protect their host trees against defoliators. Yet, locally induced responses, or the recruitment of nest-mates when a worker discovers it wound on its host-tree, were only noted in plant-ants. We wondered whether this might be due to the examination of the phenomenon being restricted to only six plant-ant species belonging to four genera. Based on the ant genus Azteca, a Neotropical group of arboreal species, we compared five species. The territorially dominant, carton-nester A. chartifex, three plant-ant species [A. alfari and A. ovaticeps associated with myrmecophitic Cecropia (Cecropiaceae), and A. bequaerti associated with Tococa guianensis (Melastomataceae)], and A. schimperi thought to be a temporary social parasite of true Cecropia ants. Methods: We artificially inflicted wounds to the foliage of the host tree of the different ant species. We then compared the number of workers on wounded versus control leaves. Results: We noted a locally induced response in the three plant-ant species as well as in the territorially dominant species, but very slightly so in A. schimperi. |
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[Grangier, Julien; Orivel, Jerome] Univ Toulouse 2, Lab Evolut & Diversite Biol, CNRS, UMR 5174, Toulouse, France, Email: alain.dejean@wanadoo.fr |
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EVOLUTIONARY ECOLOGY LTD |
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1522-0613 |
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ISI:000264041000008 |
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EcoFoG @ eric.marcon @ |
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119 |
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Dejean, A.; Grangier, J.; Leroy, C.; Orivel, J. |
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Title |
Predation and aggressiveness in host plant protection: a generalization using ants from the genus Azteca |
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Journal Article |
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Year |
2009 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
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Volume |
96 |
Issue |
1 |
Pages |
57-63 |
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Keywords |
Aggressiveness; Ant-plant relationships; Biotic defence; Predation |
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Abstract |
In studying the ant genus Azteca, a Neotropical group of arboreal species, we aimed to determine the extent to which the ants use predation and/or aggressiveness to protect their host plants from defoliating insects. We compared a territorially dominant, carton-nester, Azteca chartifex, and three plant-ant species. Azteca alfari and Azteca ovaticeps are associated with the myrmecophyte Cecropia (Cecropiaceae) and their colonies shelter in its hollow branches; whereas Azteca bequaerti is associated with Tococa guianensis (Melastomataceae) and its colonies shelter in leaf pouches situated at the base of the laminas. Whereas A. bequaerti workers react to the vibrations transmitted by the lamina when an alien insect lands on a leaf making it unnecessary for them to patrol their plant, the workers of the three other species rather discover prey by contact. The workers of all four species use a predatory behaviour involving spread-eagling alien insects after recruiting nestmates at short range, and, in some cases, at long range. Because A. alfari and A. ovaticeps discard part of the insects they kill, we deduced that the workers' predatory behaviour and territorial aggressiveness combine in the biotic defence of their host tree. |
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[Dejean, Alain; Leroy, Celine] CNRS, UMR Ecol Forets Guyane 8172, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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0028-1042 |
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ISI:000261791000006 |
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EcoFoG @ eric.marcon @ |
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125 |
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Dejean, A.; Grangier, J.; Leroy, C.; Orivel, J.; Gilbernau, M. |
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Title |
Nest site selection and induced response in a dominant arboreal ant species |
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Journal Article |
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Year |
2008 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
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Volume |
95 |
Issue |
9 |
Pages |
885-889 |
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Keywords |
ant-plant relationships; biotic defense; induced responses; predation |
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It is well known that arboreal ants, both territorially dominant species and plant ants (e.g., species associated with myrmecophytes or plants housing them in hollow structures), protect their host trees from defoliators. Nevertheless, the presence of an induced defense, suggested by the fact that the workers discovering a leaf wound recruit nestmates, is only known for plant ants. Based on the results from a field study, we show here (1) that colonies of Azteca chartifex, a territorially dominant, neotropical arboreal ant species, mostly selected Goupia glabra (Goupiaceae) trees in which to build their principal carton nests and (2) that plant signals induced workers to recruit nestmates, which patrol the leaves, likely providing the plant with a biotic defense. Furthermore, the number of recruited workers was clearly higher on G. glabra, their most frequently selected host tree species, than on other tree species. These results show that contrary to what was previously believed, induced responses are also found in territorially dominant arboreal ants and so are not limited to the specific associations between myrmecophytes and plant ants. |
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[Dejean, Alain] CNRS Guyane, UPS 5621, F-97300 Cayenne, France, Email: alain.dejean@wanadoo.fr |
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0028-1042 |
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ISI:000258675700013 |
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EcoFoG @ eric.marcon @ |
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209 |
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Author |
Dejean, A.; Groc, S.; Herault, B.; Rodriguez-Pérez, H.; Touchard, A.; Céréghino, R.; Delabie, J.H.C.; Corbara, B. |
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Title |
Bat aggregation mediates the functional structure of ant assemblages |
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Journal Article |
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Year |
2015 |
Publication |
Comptes Rendus – Biologies |
Abbreviated Journal |
Comptes Rendus – Biologies |
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Volume |
338 |
Issue |
10 |
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688-695 |
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Keywords |
Ant functional groups; Bat roosts; Biogeochemical hotspots; Bioindicators; Stable isotopes |
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In the Guianese rainforest, we examined the impact of the presence of guano in and around a bat roosting site (a cave). We used ant communities as an indicator to evaluate this impact because they occupy a central place in the functioning of tropical rainforest ecosystems and they play different roles in the food web as they can be herbivores, generalists, scavengers or predators. The ant species richness around the cave did not differ from a control sample situated 500m away. Yet, the comparison of functional groups resulted in significantly greater numbers of detritivorous fungus-growing and predatory ant colonies around the cave compared to the control, the contrary being true for nectar and honeydew feeders. The role of bats, through their guano, was shown using stable isotope analyses as we noted significantly greater δ15N values for the ant species captured in and around the cave compared to controls. © 2015 Académie des sciences. |
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Laboratoire Microorganismes, Génome et Environnement, Université Clermont-Auvergne, Université Blaise-Pascal, BP 10448, Clermont-Ferrand, France |
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Export Date: 2 October 2015 |
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EcoFoG @ webmaster @ |
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625 |
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Author |
Dejean, A.; Labrière, N.; Touchard, A.; Petitclerc, F.; Roux, O. |
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Title |
Nesting habits shape feeding preferences and predatory behavior in an ant genus |
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Journal Article |
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Year |
2014 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
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Volume |
101 |
Issue |
4 |
Pages |
323-330 |
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Keywords |
Ant genus Pseudomyrmex; Arboreal and ground nesting; Feeding preferences; Myrmecophytism; Predation |
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We tested if nesting habits influence ant feeding preferences and predatory behavior in the monophyletic genus Pseudomyrmex (Pseudomyrmecinae) which comprises terrestrial and arboreal species, and, among the latter, plant-ants which are obligate inhabitants of myrmecophytes (i.e., plants sheltering so-called plant-ants in hollow structures). A cafeteria experiment revealed that the diet of ground-nesting Pseudomyrmex consists mostly of prey and that of arboreal species consists mostly of sugary substances, whereas the plant-ants discarded all the food we provided. Workers forage solitarily, detecting prey from a distance thanks to their hypertrophied eyes. Approach is followed by antennal contact, seizure, and the manipulation of the prey to sting it under its thorax (next to the ventral nerve cord). Arboreal species were not more efficient at capturing prey than were ground-nesting species. A large worker size favors prey capture. Workers from ground- and arboreal-nesting species show several uncommon behavioral traits, each known in different ant genera from different subfamilies: leaping abilities, the use of surface tension strengths to transport liquids, short-range recruitment followed by conflicts between nestmates, the consumption of the prey's hemolymph, and the retrieval of entire prey or pieces of prey after having cut it up. Yet, we never noted group ambushing. We also confirmed that Pseudomyrmex plant-ants live in a kind of food autarky as they feed only on rewards produced by their host myrmecophyte, or on honeydew produced by the hemipterans they attend and possibly on the fungi they cultivate. © 2014 Springer-Verlag Berlin Heidelberg. |
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IRD, MIVEGEC (IRD 224-CNRS 5290-UM1-UM2), Équipe BEES, 911 avenue Agropolis, 34394 Montpellier Cedex 5, France |
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Springer Verlag |
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00281042 (Issn) |
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Export Date: 5 May 2014; Source: Scopus; Coden: Natwa; Language of Original Document: English; Correspondence Address: Dejean, A.; CNRS, Écologie des Forêts de Guyane (UMR-CNRS 8172), Campus Agronomique, BP 316, 97379 Kourou cedex, France; email: alain.dejean@wanadoo.fr |
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no |
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EcoFoG @ webmaster @ |
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539 |
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Author |
Dejean, A.; Lachaud, J.P. |
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The hunting behavior of the African ponerine ant Pachycondyla pachyderma |
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Journal Article |
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Year |
2011 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Processes |
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86 |
Issue |
2 |
Pages |
169-173 |
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Keywords |
Hunting behavior; Feeding specialization; Behavioral flexibility; Ponerine ants; Pachycondyla; Myriapoda |
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Abstract |
The hunting behavior of the African ponerine ant Pachycondyla pachyderma, a semi-specialized centipede predator, appears well adapted to this kind of prey and shows a graded complexity according to the difficulty it has in overwhelming prey. Small prey (5-to-8-mm-long termites) were detected by contact and seized by the thorax while larger prey (>= 30-mm-long centipedes) were frequently detected from a distance and seized by the anterior-most part of their body. Termites and 30-mm-long lithobiomorph centipedes were not always stung, whereas stinging and even repeated stinging was needed for 50-mm-long geophilomorphs and scolopendromorphs. Moreover, overwhelming wide and heavy scolopendromorphs, which have better defensive abilities, involved the use of additional behaviors allowing the workers to capture them safely: venom spreading, and a peculiar stinging posture, the “fatal embrace”. Here the workers seize scolopendromorphs by an antenna or by one of their first legs, wrap themselves around the prey while maintaining their grip with their mandibles and legs, and slowly inject venom into the prey's ventral surface. Workers retrieve small prey solitarily while, for large geophilomorphs and scolopendromorphs, nestmates can be recruited at short range or even at long range through tandem running. (C) 2010 Elsevier B.V. All rights reserved. |
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[Dejean, Alain] CNRS, Ecol Forets Guyane UMR CNRS 8172, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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Elsevier Science Bv |
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0376-6357 |
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ISI:000287984900001 |
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no |
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EcoFoG @ webmaster @ |
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301 |
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Dejean, A.; Leroy, C.; Corbara, B.; Cereghino, R.; Roux, O.; Herault, B.; Rossi, V.; Guerrero, R.J.; Delabie, J.H.C.; Orivel, J.; Boulay, R. |
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Title |
A temporary social parasite of tropical plant-ants improves the fitness of a myrmecophyte |
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Journal Article |
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Year |
2010 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
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Volume |
97 |
Issue |
10 |
Pages |
925-934 |
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Keywords |
Ant-plant relationships; Biotic defense; Parasites of mutualisms; Temporary social parasites; Azteca; Cecropia |
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Abstract |
Myrmecophytes offer plant-ants a nesting place in exchange for protection from their enemies, particularly defoliators. These obligate ant-plant mutualisms are common model systems for studying factors that allow horizontally transmitted mutualisms to persist since parasites of ant-myrmecophyte mutualisms exploit the rewards provided by host plants whilst providing no protection in return. In pioneer formations in French Guiana, Azteca alfari and Azteca ovaticeps are known to be mutualists of myrmecophytic Cecropia (Cecropia ants). Here, we show that Azteca andreae, whose colonies build carton nests on myrmecophytic Cecropia, is not a parasite of Azteca-Cecropia mutualisms nor is it a temporary social parasite of A. alfari; it is, however, a temporary social parasite of A. ovaticeps. Contrarily to the two mutualistic Azteca species that are only occasional predators feeding mostly on hemipteran honeydew and food bodies provided by the host trees, A. andreae workers, which also attend hemipterans, do not exploit the food bodies. Rather, they employ an effective hunting technique where the leaf margins are fringed with ambushing workers, waiting for insects to alight. As a result, the host trees' fitness is not affected as A. andreae colonies protect their foliage better than do mutualistic Azteca species resulting in greater fruit production. Yet, contrarily to mutualistic Azteca, when host tree development does not keep pace with colony growth, A. andreae workers forage on surrounding plants; the colonies can even move to a non-Cecropia tree. |
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[Dejean, Alain; Leroy, Celine; Roux, Olivier; Orivel, Jerome] CNRS, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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0028-1042 |
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ISI:000282094100006 |
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EcoFoG @ eric.marcon @ |
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77 |
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Dejean, A.; Leroy, C.; Corbara, B.; Roux, O.; Cereghino, R.; Orivel, J.; Boulay, R. |
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Title |
Arboreal Ants Use the "Velcro (R) Principle'' to Capture Very Large Prey |
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Journal Article |
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Year |
2010 |
Publication |
PLoS One |
Abbreviated Journal |
PLoS One |
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Volume |
5 |
Issue |
6 |
Pages |
e11331 |
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Abstract |
Plant-ants live in a mutualistic association with host plants known as "myrmecophytes'' that provide them with a nesting place and sometimes with extra-floral nectar (EFN) and/or food bodies (FBs); the ants can also attend sap-sucking Hemiptera for their honeydew. In return, plant-ants, like most other arboreal ants, protect their host plants from defoliators. To satisfy their nitrogen requirements, however, some have optimized their ability to capture prey in the restricted environment represented by the crowns of trees by using elaborate hunting techniques. In this study, we investigated the predatory behavior of the ant Azteca andreae which is associated with the myrmecophyte Cecropia obtusa. We noted that up to 8350 ant workers per tree hide side-by-side beneath the leaf margins of their host plant with their mandibles open, waiting for insects to alight. The latter are immediately seized by their extremities, and then spread-eagled; nestmates are recruited to help stretch, carve up and transport prey. This group ambush hunting technique is particularly effective when the underside of the leaves is downy, as is the case for C. obtusa. In this case, the hook-shaped claws of the A. andreae workers and the velvet-like structure of the underside of the leaves combine to act like natural Velcro (R) that is reinforced by the group ambush strategy of the workers, allowing them to capture prey of up to 13,350 times the mean weight of a single worker. |
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[Dejean, Alain; Leroy, Celine; Roux, Olivier; Orivel, Jerome] CNRS, Ecol Forets Guyane UMR CNRS 8172, Kourou, France, Email: alain.dejean@wanadoo.fr |
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PUBLIC LIBRARY SCIENCE |
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1932-6203 |
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ISI:000279140800028 |
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EcoFoG @ eric.marcon @ |
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56 |
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Dejean, A.; Moreau, C.S.; Kenne, M.; Leponce, M. |
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Title |
The raiding success of Pheidole megacephala on other ants in both its native and introduced ranges |
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Journal Article |
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Year |
2008 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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Volume |
331 |
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8 |
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631-635 |
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invasive ants; predation; raiding other ants; recruitment |
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We studied the behaviour of the invasive African myrmicine ant, Pheidole megacephala, when confronted with colonies of other common ant species in Cameroon, a part of its native range, and in Mexico, where it has been introduced. P. megacephala raided the nests of the other ants in both cases. Eleven species out of 12 put up a rather strong resistance to raiding P. megacephala workers in Cameroon compared to only three species out of 11 in Mexico, where only colonies of Solenopsis geminata, Dorymyrmex pyramicus and Dolichoderus bispinosus resisted these raids. We conclude that P. megacephala's heightened ability to successfully raid colonies of competing ants may help explain its success and the decline of native ants in areas where it has been introduced. |
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[Dejean, Alain] CNRS Guyane, UPS 2561, F-97300 Cayenne, France, Email: alain.dejean@wanadoo.fr |
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ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER |
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1631-0691 |
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ISI:000258523200008 |
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EcoFoG @ eric.marcon @ |
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210 |
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Dejean, A.; Moreau, C.S.; Uzac, P.; Le Breton, J.; Kenne, M. |
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Title |
The predatory behavior of Pheidole megacephala |
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Journal Article |
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2007 |
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Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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330 |
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9 |
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701-709 |
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Keywords |
Invasive ants; Landmarks; Pheidole megacephala; Predatory behavior; Recruitment; pheromone; ant; behavioral ecology; foraging behavior; invasive species; nest predation; pheromone; predator-prey interaction; animal experiment; ant; article; competitor species; controlled study; foraging behavior; host range; Isoptera; nest predation; nonhuman; predation; predator prey interaction; prey selection; species invasion; worker (insect); Animals; Ants; Feeding Behavior; Female; Isoptera; Predatory Behavior; Social Behavior; Formicidae; Hexapoda; Isoptera; Pheidole megacephala |
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We studied the foraging and predatory behaviors of the invasive African myrmicine ant, Pheidole megacephala (F.) in its native range. Workers can singly capture a wide range of insects, including relatively large prey items. For still larger prey, they recruit at short range those nestmates situated within reach of an alarm pheromone and together spread-eagle the insect. These behaviors are complimented by a long-range recruitment (of nestmates remaining in the nest) based on prey size. P. megacephala scouts also use long-range recruitment when they detect the landmarks of termites and competing ant species, thus permitting them to avoid confronting these termites and ants solitarily. |
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Département de biologie des organismes animaux, faculté des sciences, l'université de Douala, BP 24157, Douala, Cameroon |
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Cited By (since 1996): 8; Export Date: 22 October 2011; Source: Scopus; Coden: Crboc; doi: 10.1016/j.crvi.2007.06.005; PubMed ID: 17720587; Language of Original Document: English; Correspondence Address: Dejean, A.; CNRS-Guyane, UPS 2561, UMR-CNRS 5174, 16, avenue André-Aron, 97300 Cayenne, France; email: alain.dejean@wanadoo.fr |
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EcoFoG @ webmaster @ |
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354 |
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