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| Author | Fortunel, C.; Garnier, E.; Joffre, R.; Kazakou, E.; Quested, H.; Grigulis, K.; Lavorel, S.; Ansquer, P.; Castro, H.; Cruz, P.; Dolezal, J.; Eriksson, O.; Freitas, H.; Golodets, C.; Jouany, C.; Kigel, J.; Kleyer, M.; Lehsten, V.; Leps, J.; Meier, T.; Pakeman, R.; Papadimitriou, M.; Papanastasis, V.P.; Quetier, F.; Robson, M.; Sternberg, M.; Theau, J.P.; Thebault, A.; Zarovali, M. | ||||
| Title | Leaf traits capture the effects of land use changes and climate on litter decomposability of grasslands across Europe | Type | Journal Article | ||
| Year | 2009 | Publication | Ecology | Abbreviated Journal | Ecology |
| Volume | 90 | Issue | 3 | Pages  |
598-611 |
| Keywords | climate; community functional parameters; disturbance; leaf traits; litter decomposability; litter quality | ||||
| Abstract | Land use and climate changes induce shifts in plant functional diversity and community structure, thereby modifying ecosystem processes. This is particularly true for litter decomposition, an essential process in the biogeochemical cycles of carbon and nutrients. In this study, we asked whether changes in functional traits of living leaves in response to changes in land use and climate were related to rates of litter potential decomposition, hereafter denoted litter decomposability, across a range of 10 contrasting sites. To disentangle the different control factors on litter decomposition, we conducted a microcosm experiment to determine the decomposability under standard conditions of litters collected in herbaceous communities from Europe and Israel. We tested how environmental factors ( disturbance and climate) affected functional traits of living leaves and how these traits then modified litter quality and subsequent litter decomposability. Litter decomposability appeared proximately linked to initial litter quality, with particularly clear negative correlations with lignin-dependent indices ( litter lignin concentration, lignin : nitrogen ratio, and fiber component). Litter quality was directly related to community-weighted mean traits. Lignin-dependent indices of litter quality were positively correlated with community-weighted mean leaf dry matter content (LDMC), and negatively correlated with community-weighted mean leaf nitrogen concentration (LNC). Consequently, litter decomposability was correlated negatively with community-weighted mean LDMC, and positively with community-weighted mean LNC. Environmental factors ( disturbance and climate) influenced community-weighted mean traits. Plant communities experiencing less frequent or less intense disturbance exhibited higher community-weighted mean LDMC, and therefore higher litter lignin content and slower litter decomposability. LDMC therefore appears as a powerful marker of both changes in land use and of the pace of nutrient cycling across 10 contrasting sites. | ||||
| Address | [Fortunel, Claire; Garnier, Eric; Joffre, Richard; Kazakou, Elena] CNRS, UMR 5175, Ctr Ecol Fonct & Evolut, F-34293 Montpellier 5, France, Email: claire.fortunel@ecofog.gf | ||||
| Corporate Author | Thesis | ||||
| Publisher | ECOLOGICAL SOC AMER | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0012-9658 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000263776800003 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 121 | ||
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| Author | Nirma, C.; Eparvier, V.; Stien, D. | ||||
| Title | Reactivation of antibiosis in the entomogenous fungus Chrysoporthe sp. SNB-CN74 | Type | Journal Article | ||
| Year | 2015 | Publication | Journal of Antibiotics | Abbreviated Journal | Journal of Antibiotics |
| Volume | 68 | Issue | 9 | Pages |
586-590 |
| Keywords | |||||
| Abstract | Chrysoporthe sp. SNB-CN74 was isolated from a Nasutitermes corniger nest, and its ethyl acetate extract was found to exhibit very strong antibacterial activity. Two antibacterial metabolites were isolated, (-)-R-skyrin (2) and (+)-rugulosin A (3). Eventually, the fungus lost its antibiotic potential when subcultured, and the use of yeast extract induced the re-expression of these two antibiotics. Yeast extract possibly activated a cryptic pathway by mimicking the presence of an ecological competitor. © 2015 Japan Antibiotics Research Association All rights reserved. | ||||
| Address | Sorbonne Universités, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM), Observatoire Océanologique, Banyuls-sur-mer, France | ||||
| Corporate Author | Thesis | ||||
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| Area | Expedition | Conference | |||
| Notes | Export Date: 12 October 2015 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 628 | ||
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| Author | Degen, B.; Bandou, E.; Caron, H. | ||||
| Title | Limited pollen dispersal and biparental inbreeding in Symphonia globulifera in French Guiana | Type | Journal Article | ||
| Year | 2004 | Publication | Heredity | Abbreviated Journal | Heredity |
| Volume | 93 | Issue | 6 | Pages |
585-591 |
| Keywords | gene flow; microsatellites; mixed mating; spatial autocorrelation; tropical tree; twogener | ||||
| Abstract | In this paper, we report a study of the mating system and gene flow of Symphonia globulifera, a hermaphroditic, mainly bird-pollinated tree species with a large geographic distribution in the tropical Americas and Africa. Using three microsatellites, we analysed 534 seeds of 28 open pollinated families and 164 adults at the experimental site 'Paracou' in French Guiana. We observed, compared to other tropical tree species, relatively high values for the effective number of alleles. Significant spatial genetic structure was detected, with trees at distances up to 150 m more genetically similar than expected at random. We estimated parameters of the mating system and gene flow by using the mixed mating model and the TwoGener approach. The estimated multilocus outcrossing rate, t(m), was 0.920. A significant level of biparental inbreeding and a high proportion of full-sibs were estimated for the 28 seed arrays. We estimated mean pollen dispersal distances between 27 and 53 m according to the dispersal models used. Although the adult population density of S. globulifera in Paracou was relatively high, the joint estimation of pollen dispersal and density of reproductive trees gave effective density estimates of 1.6 and 1.3 trees/ha. The parameters of the mating system and gene flow are discussed in the context of spatial genetic and demographic structures, flowering phenology and pollinator composition and behaviour. | ||||
| Address | BFH, Inst Forest Genet & Forest Tree Breeding, D-22927 Grosshansdorf, Germany, Email: b.degen@holz.uni-hamburg.de | ||||
| Corporate Author | Thesis | ||||
| Publisher | NATURE PUBLISHING GROUP | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0018-067X | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000225354800009 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 259 | ||
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| Author | Leroy, C.; Sejalon-Delmas, N.; Jauneau, A.; Ruiz-Gonzalez, M.X.; Gryta, H.; Jargeat, P.; Corbara, B.; Dejean, A.; Orivel, J. | ||||
| Title | Trophic mediation by a fungus in an ant-plant mutualism | Type | Journal Article | ||
| Year | 2011 | Publication | Journal of Ecology | Abbreviated Journal | J. Ecol. |
| Volume | 99 | Issue | 2 | Pages |
583-590 |
| Keywords | delta N-15; Allomerus decemarticulatus; ant-plant-fungus interactions; Ascomycete; fungal mediation; Hirtella physophora; mutualisms; myrmecophytes; nutrient provisioning; stable isotopes | ||||
| Abstract | 1. Plants often rely on external, mutualistic partners to survive and reproduce in resource-limited environments or for protection from enemies. Such interactions, including mycorrhizal symbioses and ant plant associations, are widespread and play an important role at the ecosystem and community levels. In ant-plant mutualisms, the plants may benefit from both the protection provided by the presence of ants and from the nutrients absorbed from insect debris. However, the role of third partners in plant nutrition, particularly ant-associated fungi, has never before been demonstrated. 2. We investigate this issue in the ant-plant Hirtella physophora. In this model system, Allomerus decemarticulatus ants are involved in two, highly specific interactions: first, with their host plant, and, secondly, with a fungus that they actively manipulate. Moreover, the ants combine both plant trichomes and fungal hyphae to make a trap to capture prey. 3. We empirically demonstrate the existence of a third type of interaction between the fungus and the plant through the use of both experimental enrichments with stable isotopes (N-15) and histological approaches. The fungus growing in the galleries plays a role in providing nutrients to the host plant, in addition to the structural role it plays for the ants. Fungus-facilitated nitrogen uptake occurs mainly in old domatia, where abundant hyphae are in close contact with the plant cells. Whether the fungi inside the domatia and those in the galleries are the same is still uncertain. 4. Synthesis. Together, our results show that a fungal partner in an ant-plant mutualism can benefit the plant by improving its nutrient uptake, and they demonstrate the existence of a true tripartite mutualism in this system. Our results add further evidence to the notion that interpretations of some ant plant symbioses as purely protective mutualisms have overlooked these nutritional aspects. | ||||
| Address | [Leroy, Celine; Dejean, Alain; Orivel, Jerome] CNRS, UMR Ecol Forets Guyane, F-97379 Kourou, France, Email: jerome.orivel@ecofog.gf | ||||
| Corporate Author | Thesis | ||||
| Publisher | Wiley-Blackwell | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0022-0477 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000287785300024 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 297 | ||
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| Author | Dejean, A.; Corbara, B.; Azémar, F.; Carpenter, J.M. | ||||
| Title | When attempts at robbing prey turn fatal | Type | Journal Article | ||
| Year | 2012 | Publication | Naturwissenschaften | Abbreviated Journal | Naturwissenschaften |
| Volume | 99 | Issue | 7 | Pages |
579-582 |
| Keywords | Ant predation; Azteca andreae; Cleptobiosis; Flies and dung beetles; Myrmecophyte; Reduviidae; Socialwasps; Stinglessbees | ||||
| Abstract | Because group-hunting arboreal ants spread-eagle insect prey for a long time before retrieving them, these prey can be coveted by predatory flying insects. Yet, attempting to rob these prey is risky if the ant species is also an effective predator. Here, we show that trying to rob prey from Azteca andreae workers is a fatal error as 268 out of 276 potential cleptobionts (97.1 %) were captured in turn. The ant workers hunt in a group and use the “Velcro®” principle to cling firmly to the leaves of their host tree, permitting them to capture very large prey. Exceptions were one social wasp, plus some Trigona spp. workers and flies that landed directly on the prey and were able to take off immediately when attacked. We conclude that in this situation, previously captured prey attract potential cleptobionts that are captured in turn in most of the cases. © Springer-Verlag 2012. | ||||
| Address | Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, United States | ||||
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| Language | Summary Language | Original Title | |||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 00281042 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Export Date: 30 July 2012; Source: Scopus; Coden: Natwa; doi: 10.1007/s00114-012-0929-x; 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 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 417 | ||
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| 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 | ||
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| Author | Dezerald, O.; Céréghino, R.; Corbara, B.; Dejean, A.; Leroy, C. | ||||
| Title | Temperature: Diet Interactions Affect Survival through Foraging Behavior in a Bromeliad-Dwelling Predator | Type | Journal Article | ||
| Year | 2015 | Publication | Biotropica | Abbreviated Journal | Biotropica |
| Volume | 47 | Issue | 5 | Pages |
569-578 |
| Keywords | Toxorhynchites haemorrhoidalis; Biocontrol agent; Development; French Guiana; Selective feeding behavior; Tank bromeliad | ||||
| Abstract | Temperature, food quantity and quality play important roles in insect growth and survival, influencing population dynamics as well as interactions with other community members. However, the interaction between temperature and diet and its ecological consequences have been poorly documented. Toxorhynchites are well-known biocontrol agents for container-inhabiting mosquito larvae. We found that Toxorhynchites haemorrhoidalis larvae (Diptera: Culicidae) inhabiting water-filled rosettes of tank bromeliads catch and eat prey of both aquatic (mosquito larvae) and terrestrial origin (ants), using distinct predatory methods. They carried out frontal attacks on ants, but ambushed mosquito larvae. In choice tests, T. haemorrhoidalis favored terrestrial prey. Temperature had a significant effect on predator development and survival through its interaction with diet, but did not alter the preference for ants. T. haemorrhoidalis larvae emerged quickly when fed only mosquito larvae, whereas all individuals died before pupation when fed only ants. We conclude that behavioral factors (i.e., attraction to ants that disturb the surface of the water) overtake physiological factors (i.e., the adverse outcome of elevated temperature and an ant-based diet) in determining a predator's response to temperature:diet interactions. Finally, because T. haemorrhoidalis larvae preferentially feed on terrestrial insects in tank bromeliads, mosquito larvae may indirectly benefit from predation release. © 2015 Association for Tropical Biology and Conservation Inc. | ||||
| Address | UMR AMAP (botAnique et Modelisation de l'Architecture des Plantes et des vegetations), IRD, Boulevard de la Lironde, TA A-51/PS2, Montpellier Cedex 5, France | ||||
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| Notes | Export Date: 17 September 2015 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 624 | ||
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| Author | Gonzalès-Melo, Andrès ; Posada, Juan Manuel ; Beauchêne, Jacques ; Lehnebach, Romain ; Leviennois, Sébastien ; Rivera, Katherine ; Clair, Bruno | ||||
| Title | Radial variations in wood functional traits in a rain forest from eastern Amazonia | Type | Journal Article | ||
| Year | 2021 | Publication | Trees | Abbreviated Journal | |
| Volume | 36 | Issue | Pages |
569–581 | |
| Keywords | |||||
| Abstract | Trees can modify their wood structure in response to changes in mechanical, hydraulic and storage demands during their life-cycles. Thus, examining radial variations in wood traits is important to expand our knowledge of tree functioning and species ecological strategies. Yet, several aspects of radial changes in wood functional traits are still poorly understood, especially in angiosperm trees from tropical humid forests. Here, we examined radial shifts in wood traits in trunks of tropical forest species and explored their potential ecological implications. We first examined radial variations in wood specific gravity (WSG). Then, we asked what anatomical traits drove radial variations in WSG, and whether WSG, vessel fraction and specific hydraulic conductivity vary independently from each other along the radius gradients. We measured WSG and eight wood anatomical traits, at different radial positions along the trunks, in 19 tree species with contrasting shade-tolerance from a lowland tropical forest in eastern Amazonia. Most species had significant radials shifts in WSG. Positive radial gradients in WSG (i.e., increments from pith to bark) were common among shade-intolerant species and were explained by different combinations of fiber and parenchyma traits, while negative radial shifts in WSG (e.g., decreases towards the bark) were present in shade-tolerants, but were generally weakly related to anatomical traits. We also found that, in general, WSG was unrelated to vessel fraction and specific hydraulic conductivity in any radial position. This study illustrates the contrasting radial variations in wood functional traits that occur in tree species from a humid lowland tropical forest. In particular, our results provide valuable insights into the anatomical traits driving WSG variations during tree development. These insights are important to expand our knowledge on tree ecological strategies by providing evidence on how wood allocation varies as trees grow, which in turn can be useful in studying trait-demography associations, and in estimating tree above-ground biomass. | ||||
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| Publisher | Springer Link | Place of Publication | Editor | ||
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| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 1037 | ||
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| Author | Epron, D.; Bosc, A.; Bonal, D.; Freycon, V. | ||||
| Title | Spatial variation of soil respiration across a topographic gradient in a tropical rain forest in French Guiana | Type | Journal Article | ||
| Year | 2006 | Publication | Journal of Tropical Ecology | Abbreviated Journal | J. Trop. Ecol. |
| Volume | 22 | Issue | Pages |
565-574 | |
| Keywords | acrisol; carbon balance; carbon flux; gleysol; root biomass | ||||
| Abstract | The objective of this study was to analyse the factors explaining spatial variation in soil respiration over topographic transects in a tropical rain forest of French Guiana. The soil of 30 plots along six transects was characterized. The appearance of the 'dry to the touch' character at a depth of less than 1.2 m was used to discriminate soils exhibiting vertical drainage from soils exhibiting superficial lateral drainage and along with colour and texture, to define five classes from well-drained to strongly hydromorphic soils. Spatial variation in soil respiration was closely related to topographic position and soil type. Increasing soil water content and bulk density and decreasing root biomass and soil carbon content explained most of the decrease in soil respiration from the plateaux (vertically drained hypoferralic acrisol) to the bottomlands (haplic gleysol). These results will help to stratify further field experiments and to identify the underlying determinants of spatial variation in soil respiration to develop mechanistic models of soil respiration. | ||||
| Address | Univ Nancy 1, UMR 1137, INRA, UHP Ecol & Ecophysiol Forestieres,Fac Sci, F-54506 Vandoeuvre Les Nancy, France, Email: Daniel.Epron@scbiol.uhp-nancy.fr | ||||
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| Publisher | CAMBRIDGE UNIV PRESS | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0266-4674 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000239975200008 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 179 | ||
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| Author | Dejean, A.; Compin, A.; Delabie, J.H.C.; Azémar, F.; Corbara, B.; Leponce, M. | ||||
| Title | Biotic and abiotic determinants of the formation of ant mosaics in primary Neotropical rainforests | Type | Journal Article | ||
| Year | 2019 | Publication | Ecological Entomology | Abbreviated Journal | Ecol Entomol |
| Volume | 44 | Issue | 4 | Pages |
560-570 |
| Keywords | Ant mosaics; connections on the ground; host tree attractiveness; indicators of disturbance; primary Neotropical rainforest; territoriality | ||||
| 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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| Publisher | John Wiley & Sons, Ltd (10.1111) | Place of Publication | Editor | ||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0307-6946 | ISBN | Medium | ||
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| Notes | doi: 10.1111/een.12735 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 882 | ||
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