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| Author | Dezerald, O.; Céréghino, R.; Corbara, B.; Dejean, A.; Leroy, C. | ||||
| Title | Functional trait responses of aquatic macroinvertebrates to simulated drought in a Neotropical bromeliad ecosystem | Type | Journal Article | ||
| Year | 2015 | Publication | Freshwater Biology | Abbreviated Journal | Freshwater Biology |
| Volume | 60 | Issue | 9 | Pages | 1917-1929 |
Keywords  |
Food webs; Precipitations; Rainforests; Resistance/resilience; Tipping point | ||||
| Abstract | The duration of the dry seasons in south-eastern Amazonia is expected to increase. Little is known of how freshwater assemblages respond to drought in the humid rainforests and of the extent to which they resist the absence of rainfall before the collapse of the system. We manipulated rainshelters over tank-forming bromeliads (i.e. the interlocking leaf axils of these plants form wells that collect rainwater) to simulate an exceptionally long dry period (49 days, compared with a 10-year mean ± SD annual maximum number of 17 ± 5.3 days without rainfall at the study site) and then a rewetting period. By sampling weekly over 3 months, we followed the dynamics of the representation of abundance-weighted traits in invertebrate assemblages in these treatment plants and in a control group. The functional structure of assemblages was drought resistant until the water volume in the bromeliad pools dropped by 90%, when there was a sudden shift in the functional trait structure due to the loss of most populations except the drought-resistant culicids. Traits related to life history, body size and preferred food showed significant responses to drought. There was a convergence in the functional traits of species surviving in dry plants, strengthening the idea that environmental filtering, rather than stochasticity, determines the functional trajectory of aquatic assemblages during drought. At the end of the dry period, samples of the detritus potentially containing drought-resistant eggs/cysts (and eventually live larvae) were taken from the dry plants and rewetted in the laboratory, allowing us to distinguish resistant species from those requiring recolonisation via subsequent oviposition by adults from elsewhere. Patches of water-filled bromeliads persisting in the area provided the most important pool of colonists, and communities returned to the pre-disturbance state within 1-2 weeks of rewetting. Our results suggest that the functional trait structure of invertebrate assemblages in bromeliads could remain stable under scenarios of precipitation change that would triple the duration of current dry periods at a local scale. Future experiments should evaluate how environmental factors might alter the tipping point between resistance to drought and a collapse in ecosystem processes. © 2015 John Wiley & Sons Ltd. | ||||
| Address | IRD, UMR AMAP (botAnique et Modélisation de l'Architecture des Plantes et des vegetations), Boulevard de la Lironde, TA A-51/PS2, Montpellier Cedex 5, France | ||||
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| ISSN | ISBN | Medium | |||
| Area | Expedition | Conference | |||
| Notes | Export Date: 27 August 2015 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 616 | ||
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| Author | Dezerald, O.; Leroy, C.; Corbara, B.; Dejean, A.; Talaga, S.; Céréghino, R. | ||||
| Title | Environmental drivers of invertebrate population dynamics in Neotropical tank bromeliads | Type | Journal Article | ||
| Year | 2017 | Publication | Freshwater Biology | Abbreviated Journal | Freshw Biol |
| Volume | 62 | Issue | 2 | Pages | 229-242 |
| Keywords |
food webs; freshwater invertebrates; growth rate; life history; rainforest | ||||
| Abstract | Tank bromeliads form a conspicuous, yet neglected freshwater habitat in Neotropical forests. Recent studies driven by interests in medical entomology, fundamental aspects of bromeliad ecology and experimental research on food webs have, however, prompted increasing interest in bromeliad aquatic ecosystems. As yet, there is nothing in the literature about the life histories and environmental drivers of invertebrate population dynamics in tank bromeliads.
Based on fortnightly samples taken over one year, size frequency plots and individual dry masses allowed us to establish the life cycles and growth rates of the dominant aquatic invertebrates in a common bromeliad species of French Guiana. Linear mixed-effect models and Mantel tests were used to predict changes in density, biomass, and growth rates in relation to temperature, rainfall, humidity and detrital resources. Annual variations in invertebrate densities and biomasses could be described according to three types of distribution: unimodal, bimodal or almost constant. Despite seasonal variations, precipitation, temperature, relative humidity and detritus concentration accounted significantly for changes in density and biomass, but we found no significant responses in growth rates of most invertebrate species. Species rather displayed non-seasonal life cycles with overlapping cohorts throughout the year. There was also a trend for delayed abundance peaks among congeneric species sharing similar functional traits, suggesting temporal partitioning of available resources. Beyond novel knowledge, quantitative information on life histories is important to predict food-web dynamics under the influence of external forcing and self-organisation. Our results suggest that changes in species distribution that will affect population dynamics through biotic interactions in space and/or time could have greater effects on food webs and ecosystem functioning than changes in environmental factors per se. |
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| Language | Summary Language | Original Title | |||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1365-2427 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 716 | ||
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| Author | Brouard, O.; Céréghino, R.; Corbara, B.; Leroy, C.; Pelozuelo, L.; Dejean, A.; Carrias, J.-F. | ||||
| Title | Understorey environments influence functional diversity in tank-bromeliad ecosystems | Type | Journal Article | ||
| Year | 2012 | Publication | Freshwater Biology | Abbreviated Journal | Freshw. Biol. |
| Volume | 57 | Issue | 4 | Pages | 815-823 |
| Keywords |
Food webs; French Guiana; Invertebrates; Microorganisms; Phytotelmata; Rainforest | ||||
| Abstract | A substantial fraction of the freshwater available in neotropical forests is impounded within the rosettes of bromeliads that form aquatic islands in a terrestrial matrix. The ecosystem functioning of bromeliads is known to be influenced by the composition of the contained community but it is not clear whether bromeliad food webs remain functionally similar against a background of variation in the understorey environment. We considered a broad range of environmental conditions, including incident light and incoming litter, and quantified the distribution of a very wide range of freshwater organisms (from viruses to macroinvertebrates) to determine the factors that influence the functional structure of bromeliad food webs in samples taken from 171 tank-bromeliads. We observed a gradient of detritus-based to algal-based food webs from the understorey to the overstorey. Algae, rotifers and collector and predatory invertebrates dominated bromeliad food webs in exposed areas, whereas filter-feeding insects had their highest densities in shaded forest areas. Viruses, bacteria and fungi showed no clear density patterns. Detritus decomposition is mainly due to microbial activity in understorey bromeliads where filter feeders are the main consumers of microbial and particulate organic matter (POM). Algal biomass may exceed bacterial biomass in sun-exposed bromeliads where amounts of detritus were lower but functional diversity was highest. Our results provide evidence that tank-bromeliads, which grow in a broad range of ecological conditions, promote aquatic food web diversity in neotropical forests. Moreover, although bromeliad ecosystems have been categorised as detritus-based systems in the literature, we show that algal production can support a non-detrital food web in these systems. © 2012 Blackwell Publishing Ltd. | ||||
| Address | Ecologie des Forêts de Guyane, UMR, CNRS 8172, Campus Agronomique, 97379 Kourou Cedex, France | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 00465070 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Export Date: 21 March 2012; Source: Scopus; Coden: Fwbla; doi: 10.1111/j.1365-2427.2012.02749.x; Language of Original Document: English; Correspondence Address: Céréghino, R.; INP, UPS EcoLab (Laboratoire Ecologie Fonctionnelle et Environnement), Université de Toulouse, 118 Route de Narbonne, 31062 Toulouse, France; email: regis.cereghino@univ-tlse3.fr | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 383 | ||
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| Author | Maia, A.C.D.; Gibernau, M.; Carvalho, A.T.; Gonçalves, E.G.; Schlindwein, C. | ||||
| Title | The cowl does not make the monk: Scarab beetle pollination of the Neotropical aroid Taccarum ulei (Araceae: Spathicarpeae) | Type | Journal Article | ||
| Year | 2013 | Publication | Biological Journal of the Linnean Society | Abbreviated Journal | |
| Volume | 108 | Issue | 1 | Pages | 22-34 |
| Keywords |
Flower predation; Nocturnal pollinators; Pollination syndromes; Scarabaeidae; Thermogenesis | ||||
| Abstract | Taccarum ulei (Araceae, Spathicarpeae) is a seasonal geophytic aroid, native to north-eastern Brazil, that flowers during two months of the rainy season. Patterns of floral thermogenesis, pollination biology, and floral traits associated with pollination syndromes were studied and compared with those of other Araceae. Two species of cyclocephaline scarabs (Scarabaeidae, Cyclocephalini) were recognized as effective pollinators: Cyclocephala celata and Cyclocephala cearae. Larvae of an unidentified species of fruit fly (Melanolomaspp., Richardiidae, Diptera) were also frequently observed in inflorescences at various maturation stages, feeding on the connectives of male florets and fruits, and thus lowering the reproductive success of individual plants. Beetles were attracted by odoriferous inflorescences in the early evening of the first day of anthesis, during the female phase. The emission of attractive volatiles was coupled with intense thermogenic activity in the entire spadix, unlike other aroids in which only certain zones of the spadix heat up. Pollen release, which marks the beginning of the male phase on the subsequent evening, was not related to floral thermogenesis. Comparative multivariate analysis of the floral traits of T.ulei points to a beetle-pollinated aroid, although some of the observed traits of the species are not common to other taxa sharing this pollination strategy. Such incongruence might be explained by the evolutionary history of the tribe Spathicarpeae and potential pollinator shifts. © 2012 The Linnean Society of London. | ||||
| Address | Departamento de Botânica, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil | ||||
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| Notes | Export Date: 3 January 2013; Source: Scopus | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 453 | ||
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| Author | Quilichini, A.; Macquart, D.; Barabe, D.; Albre, J.; Gibernau, M. | ||||
| Title | Reproduction of the West Mediterranean endemic Arum pictum (Araceae) on Corsica | Type | Journal Article | ||
| Year | 2010 | Publication | Plant Systematics and Evolution | Abbreviated Journal | Plant Syst. Evol. |
| Volume | 287 | Issue | 3-4 | Pages | 179-187 |
| Keywords |
Floral volatiles; Ocimene; Insect pollination; Reproductive success; Sphaeroceridae; Thermogenesis | ||||
| Abstract | Pollination in the genus Arum appears to be in general a complex deceptive pollination process. The genus Arum is composed of 28 species, all belonging to the subgenus Arum, except A. pictum, the only species of the subgenus Gymnomesium, which is basal and sister to all other Arum species. The aim of this paper is to document the pollination ecology of the insular Arum pictum, the only Arum species to flower in autumn, on the island of Corsica (France). The anthesis cycle of A. pictum occurs during the day, attracting sphaerocerid flies and staphylinid beetles early in the morning and late in the afternoon of the first day. The pollen is released from the anthers early in the morning of the second day before the departure of the insects. Its thermogenic cycle matches the anthesis cycle with an original and unique, bimodal temperature pattern of the appendix (morning and afternoon), contrary to the unimodal pattern found in all other studied Arum species. Data from reproductive success and seed sets suggest that sexual reproduction in this species is limited by pollen (e.g. attracting lured insects) rather than by resources. The biology of this Western Mediterranean species appears to be different from other Western European Arum and close to some Eastern Mediterranean species. Further studies are needed to establish whether Arum pictum represents some ancestral stage or whether its peculiar biological traits are adapted to its insular distribution. | ||||
| Address | [Quilichini, Angelique; Gibernau, Marc] CNRS, UMR 8172, Ecole Forets Guyane, F-97387 Kourou, France, Email: marc.gibernau@ecofog.gf | ||||
| Corporate Author | Thesis | ||||
| Publisher | SPRINGER WIEN | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0378-2697 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000279479800008 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 51 | ||
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| Author | Lamarre, G.P.A.; Molto, Q.; Fine, P.V.A.; Baraloto, C. | ||||
| Title | A comparison of two common flight interception traps to survey tropical arthropods | Type | Journal Article | ||
| Year | 2012 | Publication | ZooKeys | Abbreviated Journal | ZooKeys |
| Volume | 216 | Issue | Pages | 43-55 | |
| Keywords |
Flight interception trap; French Guiana; Malaise trap; Performance; Sampling strategies; Tropical forest; Windowpane trap | ||||
| Abstract | Tropical forests are predicted to harbor most of the insect diversity on earth, but few studies have been conducted to characterize insect communities in tropical forests. One major limitation is the lack of consensus on methods for insect collection. Deciding which insect trap to use is an important consideration for ecologists and entomologists, yet to date few study has presented a quantitative comparison of the results generated by standardized methods in tropical insect communities. Here, we investigate the relative performance of two flight interception traps, the windowpane trap, and the more widely used malaise trap, across a broad gradient of lowland forest types in French Guiana. The windowpane trap consistently collected significantly more Coleoptera and Blattaria than the malaise trap, which proved most effective for Diptera, Hymenoptera, and Hemiptera. Orthoptera and Lepidoptera were not well represented using either trap, suggesting the need for additional methods such as bait traps and light traps. Our results of contrasting trap performance among insect orders underscore the need for complementary trapping strategies using multiple methods for community surveys in tropical forests. | ||||
| Address | Department of Biology, University of Florida, Gainesville, FL 32611, United States | ||||
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| ISSN | 13132989 (Issn) | ISBN | Medium | ||
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| Notes | Export Date: 4 October 2012; Source: Scopus; doi: 10.3897/zookeys.216.3332; Language of Original Document: English; Correspondence Address: Lamarre, G. P. A.; UniversitéAntilles-Guyane, UMR Ecologie des Forèts de Guyane, Campus agronomique de Kourou. Avenue de France, 97310 Kourou, French Guiana; email: Greg.Lamarre@ecofog.gf | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 438 | ||
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| Author | Clair, B.; Déjardin, A.; Pilate, G.; Alméras, T. | ||||
| Title | Is the G-layer a tertiary cell wall? | Type | Journal Article | ||
| Year | 2018 | Publication | Frontiers in Plant Science | Abbreviated Journal | |
| Volume | 9 | Issue | Pages | 623 | |
| Keywords |
Flax; G-layer; Gelatinous layer; Maturation stress; Secondary cell wall; Tension wood; Tertiary cell wall | ||||
| Abstract | |||||
| Address | LMGC, CNRS, Université de Montpellier, Montpellier, France | ||||
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| Notes | Export Date: 31 May 2018 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 805 | ||
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| Author | Ghislain, B.; Nicolini, E.-A.; Romain, R.; Ruelle, J.; Yoshinaga, A.; Alford, M.H.; Clair, B. | ||||
| Title | Multilayered structure of tension wood cell walls in Salicaceae sensu lato and its taxonomic significance | Type | Journal Article | ||
| Year | 2016 | Publication | Botanical Journal of the Linnean Society | Abbreviated Journal | Bot. J. Linn. Soc. |
| Volume | 182 | Issue | 4 | Pages | 744-756 |
| Keywords |
Flacourtiaceae; G-layer; multilayered tension wood; reaction wood | ||||
| Abstract | Salicaceae have been enlarged to include a majority of the species formerly placed in the polyphyletic tropical Flacourtiaceae. Several studies have reported a peculiar and infrequently formed multilayered structure of tension wood in four of the tropical genera. Tension wood is a tissue produced by trees to restore their vertical orientation and most studies have focused on trees developing tension wood by means of cellulose-rich, gelatinous fibres, as in Populus and Salix (Salicaceae s.s.). This study aims to determine if the multilayered structure of tension wood is an anatomical characteristic common in other Salicaceae and, if so, how its distribution correlates to phylogenetic relationships. Therefore, we studied the tension wood of 14 genera of Salicaceae and two genera of Achariaceae, one genus of Goupiaceae and one genus of Lacistemataceae, families closely related to Salicaceae or formerly placed in Flacourtiaceae. Opposite wood and tension wood were compared with light microscopy and three-dimensional laser scanning confocal microscopy. The results indicate that a multilayered structure of tension wood is common in the family except in Salix, Populus and one of their closest relatives, Idesia polycarpa. We suggest that tension wood may be a useful anatomical character in understanding phylogenetic relationships in Salicaceae. Further investigation is still needed on the tension wood of several other putatively close relatives of Salix and Populus, in particular Bennettiodendron, Macrohasseltia and Itoa. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1095-8339 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 718 | ||
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| Author | Do, N.A.; Dias, D.; Zhang, Z.; Huang, X.; Nguyen, T.T.; Pham, V.V.; Nait-Rabah, O. | ||||
| Title | Study on the behavior of squared and sub-rectangular tunnels using the Hyperstatic Reaction Method | Type | Journal Article | ||
| Year | 2020 | Publication | Transportation Geotechnics | Abbreviated Journal | Transp. Geotech. |
| Volume | 22 | Issue | 100321 | Pages | |
| Keywords |
Finite element method; Lining; Squared shape; Sub-rectangular shape; Tunnel; efficiency measurement; finite element method; numerical model; transportation development; transportation planning; tunnel design; tunnel lining | ||||
| Abstract | |||||
| Address | Saint-Petersburg Mining University, Russian Federation | ||||
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| Publisher | Elsevier Ltd | Place of Publication | Editor | ||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 22143912 (Issn) | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 915 | ||
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| Author | Brechet, L.; Ponton, S.; Roy, J.; Freycon, V.; Couteaux, M.M.; Bonal, D.; Epron, D. | ||||
| Title | Do tree species characteristics influence soil respiration in tropical forests? A test based on 16 tree species planted in monospecific plots | Type | Journal Article | ||
| Year | 2009 | Publication | Plant and Soil | Abbreviated Journal | Plant Soil |
| Volume | 319 | Issue | 1-2 | Pages | 235-246 |
| Keywords |
Fine root; Litter quality; Nutrient cycling; Plant soil interactions; Soil respiration; Tropical plantations | ||||
| Abstract | The high spatial variability of soil respiration in tropical rainforests is well evaluated, but influences of biotic factors are not clearly understood. This study underlines the influence of tree species characteristics on soil respiration across a 16-monospecific plot design in a tropical plantation of French Guiana. A large variability of soil CO2 fluxes was observed among plots (i.e. 2.8 to 6.8 μmol m(-2) s(-1)) with the ranking being constant across seasons. There were no significant relationships between soil respiration and soil moisture or soil temperature, neither spatially, nor seasonally. The variability of soil respiration was mainly explained by quantitative factors such as leaf litterfall and basal area. Surprisingly, no significant relationship was observed between soil respiration and root biomass. However, the influence of substrate quality was revealed by a strong relationship between soil respiration and litterfall P (and litterfall N, to a lesser extent). | ||||
| Address | [Ponton, Stephane] Natl Inst Agr Res INRA Ctr Rech Nancy, Forest Ecol & Ecophysiol Unit, UMR EEF, F-54280 Seichamps, France, Email: ponton@nancy.inra.fr | ||||
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| Publisher | SPRINGER | Place of Publication | Editor | ||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0032-079X | ISBN | Medium | ||
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| Notes | ISI:000266143400020 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 110 | ||
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