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Schmidt, M.; Dejean, A. |
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Title |
A dolichoderine ant that constructs traps to ambush prey collectively: convergent evolution with a myrmicine genus |
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Journal Article |
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Year |
2018 |
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Biological Journal of the Linnean Society |
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124 |
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1 |
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41-46 |
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Azteca brevis Forel, a dolichoderine ant species, builds along the branches of its host plant galleries that bear numerous holes slightly wider than a worker’s head. We noted that the workers hide, mandibles open, beneath different holes, waiting for arthropod prey to walk by or alight. They seize the extremities of these arthropods and pull backwards, immobilizing the prey, which is then spreadeagled and later carved up or pulled into a gallery before being carved up. The total duration of the capture ranges from a few minutes to several hours. This ambush group hunting permits the capture of insects of a wide range of sizes, with the largest being 48.71 times heavier than the workers, something that we compared with other cases of group hunting by ants and trap use by other arthropods. A convergence with myrmicine ants of the genus Allomerus is shown. Thus, this study also shows that the genus Azteca presents the largest panel of group hunting strategies by ants and that there is polyethism related to polymorphism, as hunting workers are larger than their nestmates. We concluded that these gallery-shaped traps correspond to the notion of ‘extended phenotype’. |
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0024-4066 |
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10.1093/biolinnean/bly028 |
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EcoFoG @ webmaster @ |
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822 |
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Hénaut, Y.; Corbara, B.; Azémar, F.; Céréghino, R.; Dézerald, O.; Dejean, A. |
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An arboreal spider protects its offspring by diving into the water of tank bromeliads |
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Journal Article |
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Year |
2018 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
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341 |
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3 |
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196-199 |
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Water used in protective behavior; Egg sacs; ; ; Cocons; Eau utilisée dans un comportement protecteur |
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Cupiennius salei (Ctenidae) individuals frequently live in association with tank bromeliads, including Aechmea bracteata, in Quintana Roo (Mexico). Whereas C. salei females without egg sacs hunt over their entire host plant, females carrying egg sacs settle above the A. bracteata reservoirs they have partially sealed with silk. There they avoid predators that use sight to detect their prey, as is known for many bird species. Furthermore, if a danger is more acute, these females dive with their egg sacs into the bromeliad reservoir. An experiment showed that this is not the case for males or females without egg sacs. In addition to the likely abundance of prey found therein, the potential of diving into the tank to protect offspring may explain the close association of this spider with bromeliads. These results show that, although arboreal, C. salei evolved a protective behavior using the water of tank bromeliads to protect offspring. Résumé L’araignée Cupiennius salei (Ctenidae) vit souvent en association avec la broméliacée à réservoir Aechmea bracteata. Dans le Quintana Roo (Mexique), les femelles qui transportent un cocon s’installent au-dessus d’un réservoir d’A. bracteata qu’elles obstruent partiellement de voiles de soie pour se camoufler des prédateurs. En présence de vibrations importantes et répétées, ces femelles plongent avec leur cocon dans l’eau du réservoir. Notre étude montre que les autres adultes (mâles et femelles sans cocon) n’utilisent pas les réservoirs d’eau. Ainsi, en plus de l’abondance de proies, la possibilité de pouvoir plonger pour protéger la descendance pourrait expliquer l’association entre cette espèce d’araignée et les broméliacées. Nos expériences montrent que les femelles porteuses d’un cocon manifestent une stratégie de protection vis-à-vis des cocons et d’elles-mêmes en s’immergeant durant 30, voire 90minutes. |
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1631-0691 |
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EcoFoG @ webmaster @ |
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823 |
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Dejean, A.; Orivel, J.; Leponce, M.; Compin, A.; Delabie, J.H.C.; Azémar, F.; Corbara, B. |
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Title |
Ant–plant relationships in the canopy of an Amazonian rainforest: the presence of an ant mosaic |
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Journal Article |
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Year |
2018 |
Publication |
Biological Journal of the Linnean Society |
Abbreviated Journal |
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125 |
Issue |
2 |
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344-354 |
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Using different techniques to access the canopy of an Amazonian rainforest, we inspected 157 tree crowns for arboreal ants. Diversity statistics showed that our study sample was not representative of the tree and ant populations due to their high diversity in Amazonian rainforests, but permitted us to note that a representative part of territorially dominant arboreal ant species (TDAAs) was inventoried. Mapping of TDAA territories and use of a null model showed the presence of an ant mosaic in the upper canopy, but this was not the case in the sub-canopy. Among the TDAAs, carton-nesting Azteca dominated (52.98% of the trees) whereas ant-garden ants (Camponotus femoratus and Crematogaster levior), common in pioneer formations, were secondarily abundant (21.64% of the trees), and the remaining 25.37% of trees sheltered one of 11 other TDAAs. The distribution of the trees forming the upper canopy influences the structure of the ant mosaic, which is related to the attractiveness of some tree taxa for certain arboreal ant species and represents a case of diffuse coevolution. |
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0024-4066 |
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10.1093/biolinnean/bly125 |
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no |
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EcoFoG @ webmaster @ |
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824 |
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Corbara, B.; Servigne, P.; Dejean, A.; Carpenter, J.M.; Orivel, J. |
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Title |
A mimetic nesting association between a timid social wasp and an aggressive arboreal ant |
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Journal Article |
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Year |
2018 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
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Volume |
341 |
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3 |
Pages |
182-188 |
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Keywords |
Ant-wasp interactions; ; ; Mimicry; Nest site selection; Relations guêpes-fourmis; ; ; Mimétisme; Sélection du site de nidification |
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Abstract |
In French Guiana, the arboreal nests of the swarm-founding social wasp Protopolybia emortualis (Polistinae) are generally found near those of the arboreal dolichoderine ant Dolichoderus bidens. These wasp nests are typically protected by an envelope, which in turn is covered by an additional carton ‘shelter’ with structure resembling the D. bidens nests. A few wasps constantly guard their nest to keep D. bidens workers from approaching. When alarmed by a strong disturbance, the ants invade the host tree foliage whereas the wasps retreat into their nest. Notably, there is no chemical convergence in the cuticular profiles of the wasps and ants sharing a tree. The aggressiveness of D. bidens likely protects the wasps from army ant raids, but the ants do not benefit from the presence of the wasps; therefore, this relationship corresponds to a kind of commensalism. Résumé En Guyane française, les nids de la guêpe Protopolybia emortualis (Polistinae) se trouvent généralement à proximité de ceux de la fourmi arboricole Dolichoderus bidens (Dolichoderinae). Ces nids de guêpes sont typiquement protégés par une enveloppe de carton, elle-même recouverte d’une autre enveloppe formant un abri qui ressemble aux nids de carton de D. bidens. Quelques guêpes gardent leur nid en permanence afin de tenir à distance les ouvrières D. bidens. Alarmées par une forte perturbation, les fourmis envahissent tout le feuillage de leur arbre support alors que les guêpes se réfugient dans leur nid. Il n’y a pas de convergence chimique entre les profils cuticulaires des guêpes et ceux des fourmis associées. Il est très probable que les P. emortualis bénéficient d’une protection contre les fourmis légionnaires grâce à l’agressivité des D. bidens, mais il n’y a pas réciprocité, de sorte que cette relation correspond à une forme de commensalisme. |
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1631-0691 |
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EcoFoG @ webmaster @ |
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825 |
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Craine, J.M.; Elmore, A.J.; Wang, L.; Aranibar, J.; Bauters, M.; Boeckx, P.; Crowley, B.E.; Dawes, M.A.; Delzon, S.; Fajardo, A.; Fang, Y.; Fujiyoshi, L.; Gray, A.; Guerrieri, R.; Gundale, M.J.; Hawke, D.J.; Hietz, P.; Jonard, M.; Kearsley, E.; Kenzo, T.; Makarov, M.; Marañón-Jiménez, S.; McGlynn, T.P.; McNeil, B.E.; Mosher, S.G.; Nelson, D.M.; Peri, P.L.; Roggy, J.C.; Sanders-DeMott, R.; Song, M.; Szpak, P.; Templer, P.H.; Van der Colff, D.; Werner, C.; Xu, X.; Yang, Y.; Yu, G.; Zmudczyńska-Skarbek, K. |
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Title |
Isotopic evidence for oligotrophication of terrestrial ecosystems |
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Journal Article |
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Year |
2018 |
Publication |
Nature Ecology & Evolution |
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2 |
Issue |
11 |
Pages |
1735-1744 |
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Abstract |
Human societies depend on an Earth system that operates within a constrained range of nutrient availability, yet the recent trajectory of terrestrial nitrogen (N) availability is uncertain. Examining patterns of foliar N concentrations and isotope ratios (delta15N) from more than 43,000 samples acquired over 37 years, here we show that foliar N concentration declined by 9% and foliar delta15N declined by 0.6–1.6 per thousand. Examining patterns across different climate spaces, foliar delta15N declined across the entire range of mean annual temperature and mean annual precipitation tested. These results suggest declines in N supply relative to plant demand at the global scale. In all, there are now multiple lines of evidence of declining N availability in many unfertilized terrestrial ecosystems, including declines in delta15N of tree rings and leaves from herbarium samples over the past 75–150 years. These patterns are consistent with the proposed consequences of elevated atmospheric carbon dioxide and longer growing seasons. These declines will limit future terrestrial carbon uptake and increase nutritional stress for herbivores. |
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2397-334x |
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EcoFoG @ webmaster @ Craine2018 |
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827 |
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Maréchaux, I.; Bonal, D.; Bartlett, M.K.; Burban, B.; Coste, S.; Courtois, E.A.; Dulormne, M.; Goret, J.-Y.; Mira, E.; Mirabel, A.; Sack, L.; Stahl, C.; Chave, J. |
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Title |
Dry-season decline in tree sapflux is correlated with leaf turgor loss point in a tropical rainforest |
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Journal Article |
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2018 |
Publication |
Functional Ecology |
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Funct Ecol |
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32 |
Issue |
10 |
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2285-2297 |
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drought tolerance; hydraulic conductance; sap flow; sapflux density; tropical trees; turgor loss point; water potential; wilting point |
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Water availability is a key determinant of forest ecosystem function and tree species distributions. While droughts are increasing in frequency in many ecosystems, including in the tropics, plant responses to water supply vary with species and drought intensity and are therefore difficult to model. Based on physiological first principles, we hypothesized that trees with a lower turgor loss point (pi-tlp), that is, a more negative leaf water potential at wilting, would maintain water transport for longer into a dry season. We measured sapflux density of 22 mature trees of 10 species during a dry season in an Amazonian rainforest, quantified sapflux decline as soil water content decreased and tested its relationship to tree pi-tlp, size and leaf predawn and midday water potentials measured after the onset of the dry season. The measured trees varied strongly in the response of water use to the seasonal drought, with sapflux at the end of the dry season ranging from 37 to 117% (on average 83 +/- 5 %) of that at the beginning of the dry season. The decline of water transport as soil dried was correlated with tree pi-tlp (Spearman's rho > 0.63), but not with tree size or predawn and midday water potentials. Thus, trees with more drought-tolerant leaves better maintained water transport during the seasonal drought. Our study provides an explicit correlation between a trait, measurable at the leaf level, and whole-plant performance under drying conditions. Physiological traits such as pi-tlp can be used to assess and model higher scale processes in response to drying conditions. |
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Wiley/Blackwell (10.1111) |
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0269-8463 |
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doi: 10.1111/1365-2435.13188 |
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EcoFoG @ webmaster @ |
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830 |
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Author |
Salas-Lopez, A.; Violle, C.; Mallia, L.; Orivel, J. |
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Land-use change effects on the taxonomic and morphological trait composition of ant communities in French Guiana |
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Journal Article |
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2018 |
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Insect Conservation and Diversity |
Abbreviated Journal |
Insect Conserv Divers |
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11 |
Issue |
2 |
Pages |
162-173 |
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Community assembly; Formicidae; functional diversity; gradient analysis; habitat filtering; land-use intensification; n-dimensional hypervolume approach |
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Abstract Land-use changes frequently lead to major changes in the composition and diversity of organisms. A reduction in the range of strategies enabling organisms to survive in a given environment and changes in the average trait values of species may potentially be associated with variations in species? number and identity. We investigated the variation in ant taxonomic composition and morphological trait diversity along a land-use gradient in French Guiana. We measured 13 core ant morphological traits on all species sampled. We then selected the set of five traits that best captured changes along the land-use gradient. Potential effects of the variation in morphological trait diversity and average values were evaluated by examining morphological traits individually as well as in combination. We found that variation in taxonomic diversity was unrelated to the plot-level morphospace. Conversely, a significant shift in taxonomic composition was accompanied by changes in the average values of community traits along the studied gradient, examined both individually and in combination. We argue that morphological trait values may be related to the success of different species in surviving in a given environment and, therefore, are indicative of the taxonomic turnover in ants along the land-use gradient. Nevertheless, in contradiction with theoretical expectations, the morphospace is only slightly affected by habitat filtering and loosely impacted by taxonomic changes. Examining the sensitivity of the morphospace to abiotic and biotic factors and how it reflects varying ecological pressures for species is thus of the utmost importance. |
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John Wiley & Sons, Ltd (10.1111) |
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1752-458x |
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doi: 10.1111/icad.12248 |
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EcoFoG @ webmaster @ |
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892 |
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Orivel, J.; Klimes, P.; Novotny, V.; Leponce, M. |
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Resource use and food preferences in understory ant communities along a complete elevational gradient in Papua New Guinea |
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Journal Article |
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Year |
2018 |
Publication |
Biotropica |
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Biotropica |
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50 |
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4 |
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641-648 |
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altitudinal gradient; food resources; Formicidae; Mt Wilhelm; nutritional ecology |
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Elevational gradients provide an interesting opportunity for studying the effect of climatic drivers over short distances on the various facets of biodiversity. It is globally assumed that the decrease in species richness with increasing elevation follows mainly the decrease in ecosystem productivity, but studies on functional diversity still remain limited. Here, we investigated how resource use and food preferences by both individual ant species and communities foraging in the understory vary with elevation along a complete elevational gradient (200 to 3200 m asl). Five bait types reflecting some of the main ecosystem processes in which ants are involved were tested: mutualism (sucrose and melezitose), predation (live termites), and detritivory (crushed insects and chicken feces). The observed monotonic decrease in both species richness and occurrences with elevation increase was accompanied by changes in some of the tested ecosystem processes. Such variations can be explained by resource availability and/or resource limitation: Predation and bird feces removal decreased with increasing elevation possibly reflecting a decline in species able to use these resources, while insect detritivory and nectarivory were most probably driven by resource limitation (or absence of limitation), as their relative use did not change along the gradient. Consequently, resource attractiveness (i.e., food preferences at the species level) appears as an important factor in driving community structuring in ants together with the abiotic environmental conditions. |
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John Wiley & Sons, Ltd (10.1111) |
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0006-3606 |
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doi: 10.1111/btp.12539 |
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EcoFoG @ webmaster @ |
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893 |
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Author |
Sprenger, P.P.; Hartke, J.; Feldmeyer, B.; Orivel, J.; Schmitt, T.; Menzel, F. |
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Title |
Influence of Mutualistic Lifestyle, Mutualistic Partner, and Climate on Cuticular Hydrocarbon Profiles in Parabiotic Ants |
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Journal Article |
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2019 |
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Journal of Chemical Ecology |
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J Chem Ecol |
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45 |
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9 |
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741-754 |
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Abstract |
A vital trait in insects is their cuticular hydrocarbon (CHC) profile, which protects the insect against desiccation and serves in chemical communication. Due to these functions, CHC profiles are shaped by both climatic conditions and biotic interactions. Here, we investigated CHC differentiation in the neotropical parabiotic ant species Crematogaster levior and Camponotus femoratus, which mutualistically share a nest. Both consist of two cryptic species each (Cr. levior A and B and Ca. femoratus PAT and PS) that differ genetically and possess strongly different CHC profiles. We characterized and compared CHC profiles of the four cryptic species in detail. Our results suggest that Cr. levior A, Ca. femoratus PAT and Ca. femoratus PS adapted their CHC profiles to the parabiotic lifestyle by producing longer-chain CHCs. At the same time, they changed their major CHC classes, and produce more alkadienes and methyl-branched alkenes compared to Cr. levior B or non-parabiotic species. The CHC profiles of Cr. levior B were more similar to related, non-parabiotic species of the Orthocrema clade than Cr. levior A, and the chain lengths of B were similar to the reconstructed ancestral state. Signals of both the parabiotic partner (biotic conditions) and climate (abiotic conditions) were found in the CHC profiles of all four cryptic species. Our data suggest that mutualisms shaped the CHC profiles of the studied species, in particular chain length and CHC class composition. Beside this, signals of the parabiotic partners indicate potential impacts of biotic interactions, via chemical mimicry or chemical camouflage. |
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1573-1561 |
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EcoFoG @ webmaster @ Sprenger2019 |
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894 |
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Dejean, A.; Compin, A.; Delabie, J.H.C.; Azémar, F.; Corbara, B.; Leponce, M. |
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Title |
Biotic and abiotic determinants of the formation of ant mosaics in primary Neotropical rainforests |
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Journal Article |
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2019 |
Publication |
Ecological Entomology |
Abbreviated Journal |
Ecol Entomol |
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44 |
Issue |
4 |
Pages |
560-570 |
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Ant mosaics; connections on the ground; host tree attractiveness; indicators of disturbance; primary Neotropical rainforest; territoriality |
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Abstract |
1. Ants are widespread in tropical rainforests, including in the canopy where territorially dominant arboreal species represent the main part of the arthropod biomass.
2. By mapping the territories of dominant arboreal ant species and using a null model analysis and a pairwise approach this study was able to show the presence of an ant mosaic on the upper canopy of a primary Neotropical rainforest (c. 1ha sampled; 157 tall trees from 28 families). Although Neotropical rainforest canopies are frequently irregular, with tree crowns at different heights breaking the continuity of the territories of dominant ants, the latter are preserved via underground galleries or trails laid on the ground.
3. The distribution of the trees influences the structure of the ant mosaic, something related to the attractiveness of tree taxa for certain arboreal ant species rather than others.
4. Small-scale natural disturbances, most likely strong winds in the area studied (presence of canopy gaps), play a role by favouring the presence of two ant species typical of secondary formations: Camponotus femoratus and Crematogaster levior, which live in parabiosis (i.e. share territories and nests but lodge in different cavities) and build conspicuous ant gardens. In addition, pioneer Cecropia myrmecophytic trees were recorded. |
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John Wiley & Sons, Ltd (10.1111) |
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doi: 10.1111/een.12735 |
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EcoFoG @ webmaster @ |
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882 |
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