| Home | << 1 2 3 4 5 6 7 8 9 10 >> [11–20] |
|
| Records | |||||
|---|---|---|---|---|---|
| Author | Dejean, A.; Azémar, F.; Roux, O. | ||||
| Title | An invasive ant species able to counterattack marabunta raids | Type | Journal Article | ||
| Year | 2014 | Publication | Comptes Rendus Biologies | Abbreviated Journal | C. R. Biol. |
Volume  |
337 | Issue | 7-8 | Pages | 475-479 |
| Keywords | Antipredation; Army ants; Colony mate recognition; Eciton; Pheidole; aggression; ant; article; bioassay; Eciton burchellii; Eciton hamatum; emulsion; insect society; mass fragmentography; Neotropics; nonhuman; Pheidole megacephala | ||||
| Abstract | In the Neotropics where it was introduced, the invasive ant Pheidole megacephala counterattacked raids by the army ants Eciton burchellii or E. hamatum. The Eciton workers that returned to their bivouac were attacked and spread-eagled and most of them killed by their outgoing colony mates. Little by little the zone where returning and outgoing Eciton workers encountered one another moved away from the Pheidole nest which was no longer attacked, so that most of the colony was spared. Using a water-based technique rounded out by bioassays, we show that Pheidole compounds were transferred onto the Eciton cuticle during the counterattacks, so that outgoing workers do not recognize returning colony mates, likely perceived as potential prey. Because P. megacephala is an introduced African species, this kind of protection, which cannot be the result of coevolutive processes, corresponds to a kind of by-product due to its aggressiveness during colony defence. © 2014 Académie des sciences. | ||||
| Address | IRD, MIVEGEC (IRD 224 CNRS 5290-UM1-UM2) Équipe BEES, 911, avenue Agropolis, 34394 Montpellier cedex 5, France | ||||
| Corporate Author | Thesis | ||||
| Publisher | Elsevier Masson SAS | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 17683238 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Export Date: 1 September 2014; Coden: Crboc; Correspondence Address: Dejean, A.; CNRS UMR 8172, Écologie des Forêts de Guyane, BP 316, 97379 Kourou cedex, France; email: alain.dejean@wanadoo.fr | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 557 | ||
| Permanent link to this record | |||||
| Author | Dejean, A.; Corbara, B. | ||||
| Title | Reactions by army ant workers to nestmates having had contact with sympatric ant species | Type | Journal Article | ||
| Year | 2014 | Publication | Comptes Rendus Biologies | Abbreviated Journal | C. R. Biol. |
| Volume |
337 | Issue | 11 | Pages | 642-645 |
| Keywords | Army ants Antipredation Colony-mate recognition Eciton Transferring cuticular compounds; Eciton; Formicidae | ||||
| Abstract | It was recently shown that Pheidole megacephala colonies (an invasive species originating from Africa) counterattack when raided by the army ant, Eciton burchellii. The subsequent contact permits Pheidole cuticular compounds (that constitute the “colony odour”) to be transferred onto the raiding Eciton, which are then not recognised by their colony-mates and killed. Using a simple method for transferring cuticular compounds, we tested if this phenomenon occurs for Neotropical ants. Eciton workers rubbed with ants from four sympatric species were released among their colony-mates. Individuals rubbed with Solenopsis saevissima or Camponotus blandus workers were attacked, but not those rubbed with Atta sexdens, Pheidole fallax or with colony-mates (control lot). So, the chemicals of certain sympatric ant species, but not others, trigger intra-colonial aggressiveness in Eciton. We conclude that prey-ant chemicals might have played a role in the evolution of army ant predatory behaviour, likely influencing prey specialization in certain cases. | ||||
| Address | Clermont Université, Université Blaise-Pascal, LMGE, BP 10448Clermont-Ferrand, France | ||||
| Corporate Author | Thesis | ||||
| Publisher | Elsevier Masson SAS | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 16310691 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Export Date: 12 November 2014; Coden: Crboc; Correspondence Address: Dejean, A.; CNRS, É Cologie des Forêts de Guyane, UMR-CNRS 8172, BP 316, France | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 566 | ||
| Permanent link to this record | |||||
| Author | Mony, R.; Dejean, A.; Bilong, C.F.B.; Kenne, M.; Rouland-Lefèvre, C. | ||||
| Title | Melissotarsus ants are likely able to digest plant polysaccharides | Type | Journal Article | ||
| Year | 2013 | Publication | Comptes Rendus – Biologies | Abbreviated Journal | C. R. Biol. |
| Volume |
336 | Issue | 10 | Pages | 500-504 |
| Keywords | Ant-plant interactions; Degradation of plant material; Enzymatic activity; Melissotarsus ants | ||||
| Abstract | Melissotarsus ants have an extremely specialized set of behaviours. Both workers and gynes tunnel galleries in their host tree bark. Workers walk with their mesothoracic legs pointing upwards and tend Diaspididae hemiptera for their flesh. The ants use their forelegs to plug the galleries with silk that they secrete themselves. We hypothesised that the ants' energetic needs for nearly constant gallery digging could be satisfied through the absorption of host tree tissues; so, using basic techniques, we examined the digestive capacities of workers from two species. We show that workers are able to degrade oligosaccharides and heterosides as well as, to a lesser degree, polysaccharides. This is one of the rare reports on ants able to digest plant polysaccharides other than starch. © 2013 Académie des sciences. | ||||
| Address | IRD, UMR BIOEMCO-IBIOS, 32, rue Henri-Varagnat, 93143 Bondy cedex, France | ||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 16310691 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Export Date: 6 December 2013; Source: Scopus; Coden: Crboc; doi: 10.1016/j.crvi.2013.08.003; Language of Original Document: English; Correspondence Address: Dejean, A.; Université de Toulouse, UPS, Ecolab, 118, route de Narbonne, 31062 Toulouse, France; email: alain.dejean@wanadoo.fr; References: Hölldobler, B., Wilson, E.O., (1990) The Ants, , Harvard University Press Cambridge, MA, USA 730 p; Duchesne, L.C., Larson, D.W., Cellulose and the evolution of plant life (1989) BioScience, 39, pp. 238-241; Watanabe, H., Tokuda, G., Cellulolytic Systems in Insects (2010) Annu. Rev. Entomol., 55, pp. 609-632; Wenzel, M., Schonig, I., Berchtold, M., Kampfer, P., König, K., Aerobic and facultatively anaerobic cellulolytic bacteria from the gut of the Termite Zootermopsis angusticollis (2002) J. Appl. Microbiol., 92, pp. 32-40; Brune, A., Microbial symbioses in the digestive tract of lower termites (2011) Beneficial Microorganisms in Multicellular Life Forms, pp. 3-25. , E. Rosenberg, U. Gophna, Heidelberg Springer; Tokuda, G., Watanabe, H., Hidden cellulases in termites: Revision of an old hypothesis (2007) Biol. Lett., 3, pp. 336-339; Nobre, T., Aanen, D.K., Fungiculture or termite husbandry? The ruminant hypothesis (2012) Insects, 3, pp. 307-323; Zientz, E., Feldhaar, H., Stoll, S., Gross, R., Insights into the microbial world associated with ants (2005) Arch. Microbiol., 184, pp. 199-206; Aylward, F., Burnum, K.E., Scott, J.J., Suen, G., Tringe, S.G., Metagenomic and metaproteomic insights into bacterial communities in leaf-cutter ant fungus gardens (2012) ISME J., pp. 1-14; Cook, S.C., Davidson, D.W., Nutritional and functional biology of exudate-feeding ants (2006) Entomol. Exp. Appl., 118, pp. 1-10; He, H., Chen, Y., Zhang, Y., Wei, C., Bacteria associated with gut lumen of Camponotus japonicus Mayr (2011) Environ. Entomol., 40, pp. 1405-1409; Blochmann, F., Über das Vorkommen von bakterienähnlichen Gebilden in den Geweben und Eiern verschiedener Insekten (1892) Zentbl. Bakteriol., 11, pp. 234-240; Feldhaar, H., Straka, J., Krischke, M., Berthold, K., Stoll, S., Nutritional upgrading for omnivorous carpenter ants by the endosymbiont Blochmannia (2007) BMC Biol., 5, p. 48; De Souza, D.J., Bézier, A., Depoix, D., Drezen, J.M., Lenoir, A., Blochmannia endosymbionts improve colony growth and immune defence in the ant Camponotus fellah (2009) BMC Microbiol., 9, p. 29; Van Borm, S., Buschinger, A., Boomsma, J.J., Billen, J., Tetraponera ants have gut symbionts related to nitrogen-fixing root-nodule bacteria (2002) Proc. R. Soc. Lond. B., 269, pp. 2023-2027; Eilmus, S., Heil, M., Bacterial associates of arboreal ants and their putative functions in an obligate ant-plant mutualism (2009) Appl. Env. Microbiol., 75, pp. 4324-4332; Russell, J.A., Moreau, C.S., Goldman-Huertas, B., Fujiwara, M., Lohman, D.J., Pierce, N.E., Bacterial gut symbionts are tightly linked with the evolution of herbivory in ants (2009) Proc. Natl. Acad. Sci. USA, 106, pp. 21236-21241; Delage-Darchen, B., Une fourmi de Côte d'Ivoire: Melissotarsus titubans Del., N. Sp. (1972) Insect. Soc., 19, pp. 213-226; Prins, A.J., Ben-Dov, Y., Rust, D.J., A new observation on the association between ants (Hymenoptera: Formicidae) and armoured scale insects (Homoptera: Diaspididae) (1975) J. Entomol. Soc. S. Afr., 38, pp. 211-216; Mony, R., Kenne, M., Dejean, A., (2002) Biology and Ecology of Pest Ants of the Genus Melissotarsus (Formicidae: Myrmicinae), with Special Reference to Tropical Fruit Tree Attacks, Sociobiology, 40, pp. 645-654; Mony, R., Fisher, B.L., Kenne, M., Tindo, M., Dejean, A., Behavioural ecology of bark-digging ants of the genus Melissotarsus (2007) Funct. Ecosyst. Commun., 1, pp. 121-128; Fisher, B.L., Robertson, H.G., Silk production by adult workers of the ant Melissotarsus emeryi (Hymenoptera, Formicidae) in South African fynbos (1999) Insect. Soc., 46, pp. 78-83; Sanson, G., The biomechanics of browsing and grazing (2006) Am. J. Bot., 93, pp. 1531-1545; Clissold, F., Sanson, G.D., Read, J., The paradoxical effects nutrient ratios and supply rates on an outbreaking insect herbivore, the Australian plague locust (2006) J. Anim. Ecol., 75, pp. 1000-1013; Cannon, C.A., (1998) Nutritional Ecology of the Carpenter Ant Camponotus Pennsylvanicus (De Geer): Macronutrient Preference and Particle Consumption, , (PhD thesis) Blacsburg VA; Eisner, T., A comparative morphological study of the proventriculus of ants (Hymenoptera, Formicidae) (1957) Bull. Mus. Comp. Zool., 116, pp. 441-490; Caetano, F.H., Can we use the digestive tract for phyllogenetic studies in ants (1990) Social Insects and the Environment, pp. 321-322. , G.K. Veeresh, B. Mallik, C.A. Viraktamath, Oxford & IBH publishing co. New Dehli; Delage, B., Recherches sur l'alimentation des fourmis granivores Messor capitatus Latr (1962) Insect. Soc., 9, pp. 137-143; Oettler, J., Johnson, R.A., The old ladies of the seed harvester ant Pogonomyrmex rugosus: Foraging performed by two groups of workers (2009) J. Insect. Behav., 22, pp. 217-226; Abbott, A., Nutrient dynamic of ants (1977) Production Ecology of Ants and Termites, pp. 233-244. , M.V. Brian, Cambridge University Press Cambridge; D'Ettorre, P., Mora, P., Dibangou, V., Rouland, C., Errard, C., The role of symbiotic fungus in the digestive metabolism of two species of fungus-growing ants (2002) J. Comp. Physiol. B, 172, pp. 169-176; Rouland, C., Lenoir, F., Lepage, M., The role of the symbiotic fungus in the digestive metabolism of several species of fungus-growing termites (1991) Comp. Biochem. Physiol., 99 A, pp. 657-663; Williams, J., Villaroya, H., Petek Galactosidase, F., II, III and IV from seeds of Trifolium repens (1978) Biochem. J., 175, pp. 1069-1077; Werner, W., Rey, H.G., Wielinger, R.H., Properties of a new chromogen for determination of glucose in blood according to the COD/POD method (1970) Anal. Chem., 252, pp. 224-228; Mora, P., Rouland, C., Comparison of hydrolytic enzyme produced during growth on carboidrate substrated by Termitomyces associates of Pseudacanthotermes spiniger and Microtermes subhyalinus (isopteran: Termitidae) (1994) Sociobiology, 26, pp. 39-53; Koning, R.E., Secondary Growth. Plant Physiology Information, , http://plantphys.info/plant_biology/secondary.shtml; Scheffrahn, R.H., Termites (Isoptera) (2008) Encyclopedia of Entomology Part 20, pp. 3737-3747. , J.L. Capinera, Springer Berlin; Richard, F.J., Mora, P., Errard, C., Rouland, C., Digestive capacities of leaf-cutting ants and the contribution of their cultivar to the degradation of plant material (2005) J. Comp. Physiol. B, 175, pp. 297-303; Ayre, G.L., The relationships between food and digestive enzymes in five species of ants (Hymenoptera: Formicidae) (1967) Can. Entomol., 99, pp. 408-411; Went, F.W., Wheeler, J., Wheeler, G.C., Feeding and digestion in some ants (Veromessor and Manica) (1972) BioScience, 22, pp. 82-88; Moller, I.E., De Fine Licht, H.H., Harholt, J., Willats, G.T., Boomsma, J.J., The dynamics of plant cell-wall polysaccharide decomposition in leaf-cutting ant fungus garden (2011) PloS ONE, 6, p. 17506 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 516 | ||
| Permanent link to this record | |||||
| Author | Dejean, A.; Petitclerc, F.; Roux, O.; Orivel, J.; Leroy, C. | ||||
| Title | Does exogenic food benefit both partners in an ant-plant mutualism? the case of Cecropia obtusa and its guest Azteca plant-ants | Type | Journal Article | ||
| Year | 2012 | Publication | Comptes Rendus Biologies | Abbreviated Journal | C. R. Biol. |
| Volume |
335 | Issue | 3 | Pages | 214-219 |
| Keywords | Ant-plant mutualisms; Azteca; Cecropia obtusa; Myrmecotrophy; Stable isotopes | ||||
| Abstract | In the mutualisms involving the myrmecophyte Cecropia obtusa and Azteca ovaticeps or A. alfari, both predatory, the ants defend their host trees from enemies and provide them with nutrients (myrmecotrophy). A. ovaticeps provisioned with prey and then 15N-enriched food produced more individuals than did control colonies (not artificially provisioned). This was not true for A. alfari colonies, possibly due to differences in the degree of maturity of the colonies for the chosen range of host tree sizes (less than 3 m in height). Myrmecotrophy was demonstrated for both Azteca species as provisioning the ants with 15N-enriched food translated into higher δ 15N values in host plant tissues, indicating that nitrogen passed from the food to the plant. Thus, the predatory activity of their guest ants benefits the Cecropia trees not only because the ants protect them from defoliators since most prey are phytophagous insects but also because the plant absorbs nutrients. © 2012 Académie des sciences. Published by Elsevier Masson SAS. All rights reserved. | ||||
| Address | IRD, Maladies Infectieuses et Vecteurs, Équipe BEES-IRD, BP 171, Bobo-Dioulasso, Burkina Faso | ||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 16310691 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Export Date: 15 April 2012; Source: Scopus; Coden: Crboc; doi: 10.1016/j.crvi.2012.01.002; Language of Original Document: English; Correspondence Address: Dejean, A.; CNRS, Écologie des Forêts de Guyane (UMR-CNRS 8172), Campus Agronomique, 97379 Kourou cedex, France; email: alain.dejean@wanadoo.fr | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 391 | ||
| Permanent link to this record | |||||
| Author | Morel, H.; Lehnebach, R.; Cigna, J.; Ruelle, J.; Nicolini, É.; Beauchene, J. | ||||
| Title | Basic wood density variations of Parkia velutina Benoist, a long-lived heliophilic Neotropical rainforest tree | Type | Journal Article | ||
| Year | 2018 | Publication | Bois et Forets des Tropiques | Abbreviated Journal | |
| Volume |
335 | Issue | Pages | 59-69 | |
| Keywords | Curvilinear pattern; French Guiana; Intra-tree; Tropical species | ||||
| Abstract | Investigations of basic radial wood density (WD) in tropical trees revealed linear patterns and some curvilinear patterns. Studies usually disregard longitudinal variations, which are often considered to be similar to radial variations. This study aimed to show (1) a new radial curvilinear WD pattern, (2) differences in amplitude between radial and longitudinal gradients and (3) to partition WD variations according to different scales in Parkia velutina, an emergent tree found in Neotropical rain forests. We collected full discs from six felled trees and radial cores from 10 standing trees to check WD variability, plus one dominant axis per tree for analysis of height growth rates. This species showed very high growth rates indicative of heliophilic habits. WD varied from 0.194 to 0.642 g/cm3. Such amplitude is rarely observed within the same tree. Radial variation in WD was curvilinear, with an amplitude generally less than the longitudinal amplitude. Consequently, in mature trees, WD values in the crown were higher than those in the outer trunk. WD variations can be highly significant at different scales. The variance partitioning also revealed that the whole WD range of Parkia velutina is more accurately estimated intra-individually when both longitudinal and radial gradient are covered. | ||||
| Address | INRA, LERFoB, AgroParisTech, Nancy, France | ||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | ISBN | Medium | |||
| Area | Expedition | Conference | |||
| Notes | Export Date: 20 April 2018 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 799 | ||
| Permanent link to this record | |||||
| Author | Martin, J.M.; Roux, O.; Groc, S.; Dejean, A. | ||||
| Title | A type of unicoloniality within the native range of the fire ant Solenopsis saevissima | Type | Journal Article | ||
| Year | 2011 | Publication | Comptes Rendus Biologies | Abbreviated Journal | C. R. Biol. |
| Volume |
334 | Issue | 4 | Pages | 307-310 |
| Keywords | Ants; Solenopsis saevissima; Native range; Unicoloniality | ||||
| Abstract | To determine if a type of unicoloniality exists in the fire ant Solenopsis saevissima in its native range, we conducted intraspecific aggressiveness tests in French Guiana between workers originating from 15 human-disturbed sites. We identified two “colonial groups” spread over 54 km and 12.5 km, respectively. Workers from the same group never attacked each other, but inter-group confrontations resulted in a high level of aggressiveness. These large “colonial groups” enhances the threat occasioned by S. saevissima for both agriculture and the environment. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. | ||||
| Address | [Martin, Jean-Michel; Roux, Olivier; Groc, Sarah; Dejean, Alain] Ecol Forets de Guyane UMR CNRS 8172, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr | ||||
| Corporate Author | Thesis | ||||
| Publisher | Elsevier France-Editions Scientifiques Medicales Elsevier | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 1631-0691 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000290364200007 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 314 | ||
| Permanent link to this record | |||||
| Author | Hattenschwiler, S.; Fromin, N.; Barantal, S. | ||||
| Title | Functional diversity of terrestrial microbial decomposers and their substrates | Type | Journal Article | ||
| Year | 2011 | Publication | Comptes Rendus Biologies | Abbreviated Journal | C. R. Biol. |
| Volume |
334 | Issue | 5-6 | Pages | 393-402 |
| Keywords | Bacteria; Biogeochemical cycles; Decomposition; Dissimilarity; Ecosystem functioning; Functional diversity indices; Fungi; Leaf litter | ||||
| Abstract | The relationship between biodiversity and biogeochemical processes gained much interest in light of the rapidly decreasing biodiversity worldwide. In this article, we discuss the current status, challenges and prospects of functional concepts to plant litter diversity and microbial decomposer diversity. We also evaluate whether these concepts permit a better understanding of how biodiversity is linked to litter decomposition as a key ecosystem process influencing carbon and nutrient cycles. Based on a literature survey, we show that plant litter and microbial diversity matters for decomposition, but that considering numbers of taxonomic units appears overall as little relevant and less useful than functional diversity. However, despite easily available functional litter traits and the well-established theoretical framework for functional litter diversity, the impact of functional litter diversity on decomposition is not yet well enough explored. Defining functional diversity of microorganisms remains one of the biggest challenges for functional approaches to microbial diversity. Recent developments in microarray and metagenomics technology offer promising possibilities in the assessment of the functional structure of microbial communities. This might allow significant progress in measuring functional microbial diversity and ultimately in our ability to predict consequences of biodiversity loss in the decomposer system for biogeochemical processes. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. | ||||
| Address | [Haettenschwiler, Stephan; Fromin, Nathalie; Barantal, Sandra] CNRS, CEFE, F-34293 Montpellier 5, France, Email: stephan.hattenschwiler@cefe.cnrs.fr | ||||
| Corporate Author | Thesis | ||||
| Publisher | Elsevier France-Editions Scientifiques Medicales Elsevier | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 1631-0691 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000292013400008 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 323 | ||
| Permanent link to this record | |||||
| Author | Masse, P.S.M.; Kenne, M.; Mony, R.; Dejean, A.; Tindo, M. | ||||
| Title | Initial behavior in colony fragments of an introduced population of the invasive ant Wasmannia auropunctata | Type | Journal Article | ||
| Year | 2011 | Publication | Comptes Rendus Biologies | Abbreviated Journal | C. R. Biol. |
| Volume |
334 | Issue | 7 | Pages | 572-576 |
| Keywords | Aggregation; Death feigning; Thanatosis; Worker transportation; Biological invasion; Little fire ant | ||||
| Abstract | We investigated in the laboratory the initial behavior of propagules of the invasive ant Wasmannia auropunctata in Cameroon where it has been introduced. Both workers and queens at first feigned death (thanatosis), and then the workers slowly moved around the experimental arena; the queens did the same about 10 seconds later. Each queen antennated selected workers that then aggregated together by grasping the hind leg of another ant with their mandibles. When encountering the queen again, the lead worker climbed up the queen's hind leg and onto her back, followed by some other individuals. The remaining workers followed the queen to a location in the experimental arena. When brood was present, the workers transferred it to this location. Orphaned workers did not aggregate, but gathered the brood together and took care of it. By permitting propagules to survive, these behaviors likely contribute to the success of W. auropunctata as an invader. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. | ||||
| Address | [Kenne, M; Mony, R; Tindo, M] Univ Douala, Fac Sci, Dept Biol Organismes Anim, Douala, Cameroon, Email: tindodouala@yahoo.com | ||||
| Corporate Author | Thesis | ||||
| Publisher | Elsevier France-Editions Scientifiques Medicales Elsevier | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 1631-0691 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | WOS:000293673300010 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 332 | ||
| Permanent link to this record | |||||
| Author | Morel, H.; Nicolini, E.; Bossu, J.; Blanc, L.; Beauchene, J. | ||||
| Title | Qualité et usages du bois de cinq espèces forestières adaptées à la plantation à vocation de bois d’oeuvre et testées en Guyane française | Type | Journal Article | ||
| Year | 2017 | Publication | Bois & Forêts des Tropiques | Abbreviated Journal | |
| Volume |
334 | Issue | Pages | 61-74 | |
| Keywords | propriétés technologiques; qualité du bois; plantation; Guyane française | ||||
| Abstract | Des essais de plantations forestières ont été menés en Guyane française depuis le début des années 1960 sur plus de 138 espèces (70 espèces natives et 68 espèces exotiques). Une étude récente sur la productivité de ces espèces en plantation (projet ForesTreeCulture, 2013-2015) a mis en avant le fort potentieldeproductiondetroisespècesnatives ( Simarouba amara Aubl., Vochysia tomentosa (G. Mey.) DC., Bagassa guianensis ( Aubl.)) et d’une espèce d’Afrique de l’Ouest ( Tarrietia utilis Sprague) avec des volumes de bois produits supérieurs à 20 m3/ha/an. Cependant, les propriétés du bois de ces espèces commerciales ne sont connues qu’au travers d’arbres issus de forêt naturelle. Nous présentons les propriétés du bois de ces espèces en conditions de plantation – densité, retrait, élasticité, angle du fil, durabilité – et discutons de leurs potentiels et de leurs usages respectifs futurs. Une autre espèce, Cordia alliodora ((Ruiz et Pavon) Oken), a également été retenue bien qu’elle n’ait pas encore été plantée en Guyane française. Cette espèce, native de Guyane, est bien connue en Amérique latine pour son bois et son fort potentiel de croissance en milieu anthropisé. | ||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | ISBN | Medium | |||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 786 | ||
| Permanent link to this record | |||||
| Author | Castro, H.; Fortunel, C.; Freitas, H. | ||||
| Title | Effects of land abandonment on plant litter decomposition in a Montado system: relation to litter chemistry and community functional parameters | Type | Journal Article | ||
| Year | 2010 | Publication | Plant and Soil | Abbreviated Journal | Plant Soil |
| Volume |
333 | Issue | 1-2 | Pages | 181-190 |
| Keywords | Ecosystem processes; Land use change; Leaf dry matter content; Life form; Litter quality; Mediterranean | ||||
| Abstract | Changes in land use and subsequent shifts in vegetation can influence decomposition through changes in litter quality (chemistry and structure) and alterations of soil temperature and moisture. Our aim was to study the effects of land abandonment on litter decomposition in a Mediterranean area of Montado, South Portugal. We tested the hypothesis that decomposition tends to slow down with abandonment, as woody species, richer in lignified structures, replace herbaceous species. We assessed the decomposition of community litter in situ using litterbag technique. To test the influence of local conditions, we simultaneously incubated a standard litter in situ. Our results showed that the shift from herbaceous to shrub-dominated communities lead to decreased decomposition rates. Changes in litter decomposition were primarily driven by changes in litter quality, even though the uneven pattern of litter mass loss over the experiment might reveal an effect from possible differences in microclimate. Shrub litter had higher nutrient content than herbaceous litter, which seemed to favour higher initial decomposition rates, but lower decomposition rate in the longer term. Shrubs also contribute to woody litter, richer in lignin, and secondary compounds that retard decomposition, and may play a role in increasing pools of slowly decomposing organic matter. | ||||
| Address | [Castro, Helena; Freitas, Helena] Univ Coimbra, Dept Life Sci, Ctr Funct Ecol, P-3001401 Coimbra, Portugal, Email: hecastro@ci.uc.pt | ||||
| Corporate Author | Thesis | ||||
| Publisher | SPRINGER | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0032-079X | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000280089400015 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 49 | ||
| Permanent link to this record | |||||