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Shepard, W.D.; Clavier, S.; Cerdan, A. |
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Title |
A generic key to the known larval elmidae (Insecta: Coleoptera) of French Guiana |
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Journal Article |
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Year |
2020 |
Publication |
Papeis Avulsos de Zoologia |
Abbreviated Journal |
Pap. Avulsos Zool. |
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Volume |
60 |
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Special |
Pages |
e202060 |
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Keywords |
Biodiversity; Identification; Immatures; Neotropical; Survey |
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Abstract |
An identification key is provided for 21 larval types of Elmidae (riffle beetles) known to occur in French Guiana. Not all elmid genera known to occur in French Guiana are known in the larval stage. Nor are all the known larval types assigned to known elmid genera. © 2020, Universidade de Sao Paulo. All rights reserved. |
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CNRS, UMR EcoFog (AgroParisTech, CIRAD, INRA, Université des Antilles, Université de Guyane), Kourou Cedex, France |
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Universidade de Sao Paulo |
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00311049 (Issn) |
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EcoFoG @ webmaster @ |
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980 |
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Author |
Maia, A.C.D.; Schlindwein, C.; Navarro, D.M.A.F.; Gibernau, M. |
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Title |
Pollination of Philodendron Acutatum (Araceae) in the Atlantic Forest of Northeastern Brazil: A Single Scarab Beetle Species Guarantees High Fruit Set |
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Journal Article |
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Year |
2010 |
Publication |
International Journal of Plant Sciences |
Abbreviated Journal |
Int. J. Plant Sci. |
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Volume |
171 |
Issue |
7 |
Pages |
740-748 |
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Keywords |
Cyclocephala; floral volatiles; pollination specificity; reproductive success; thermogenesis |
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Philodendron acutatum (Araceae) is a hemiepiphyte common to the Atlantic Forest of northeastern Brazil. In two localities, we studied the species' breeding system and associations with flower-visiting insects, along with an analysis of its floral scent composition. The fruit set of self-incompatible P. acutatum was high, more than 90%, and inflorescences were exclusively pollinated by one species of scarab beetle, Cyclocephala celata (Scarabaeidae, Dynastinae). Pollinators are drawn toward the inflorescences at dusk by strong floral fragrances given off during the female phase of anthesis, along with endogenous heating of the spadix, whose temperatures were recorded at more than 11 degrees C above ambient air. Two other species of flower-visiting Cyclocephala were also consistently recovered in blacklight trappings during the flowering period of P. acutatum. The fact that only C. celata was found in association with P. acutatum suggests a local reproductive dependence of the plant to this scarab beetle species. Dihydro-beta-ionone and 2-hydroxy-5-methyl-3-hexanone, a rare volatile molecule so far unreported as a floral compound, together accounted for more than 97% of the unique scent composition of P. acutatum and might be involved in specific attraction of C. celata. |
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[Dalia Maia, Artur Campos] Univ Fed Paraiba, Programa Posgrad Ciencias Biol, BR-58059900 Joao Pessoa, Paraiba, Brazil, Email: arturcamposmaia@yahoo.com.br |
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UNIV CHICAGO PRESS |
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1058-5893 |
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ISI:000280855800003 |
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EcoFoG @ eric.marcon @ |
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46 |
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Gond, V.; Bartholome, E.; Ouattara, F.; Nonguierma, A.; Bado, L. |
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Title |
Monitoring and mapping of waters and wetlands in arid regions using the SPOT-4 VEGETATION imaging system |
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Journal Article |
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Year |
2004 |
Publication |
International Journal of Remote Sensing |
Abbreviated Journal |
Int. J. Remote Sens. |
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Volume |
25 |
Issue |
5 |
Pages |
987-1004 |
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Monitoring the state of small waterbodies and wetlands is very useful in dry regions, because their existence is entirely controlled by the rhythm of local rainfall. On VEGETATION image colour composites, waterbodies and marshy vegetation show up clearly. Yet simple image classification does not yield sufficiently good results because 'spectral signatures' vary significantly together with the ecological conditions of these surfaces. A robust contextual procedure taking into account local contrast was successfully developed and tested. A systematic validation was carried out and a map of waterbodies and wetlands was produced for Burkina Faso and neighbouring regions. |
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Ctr Commun Rech, I-21020 Ispra, VA, Italy, Email: valery.gond@cirad.fr |
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TAYLOR & FRANCIS LTD |
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0143-1161 |
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ISI:000187996500007 |
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EcoFoG @ eric.marcon @ |
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266 |
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Author |
Mahoui,Sihem ; Moulay, Mohamed Said ; Omrane, Abdennebi |
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Title |
Finite element approach to linear parabolic pointwise control problems of incomplete data |
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Journal Article |
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Year |
2020 |
Publication |
International Journal of Systems Science |
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Volume |
51 |
Issue |
14 |
Pages |
2597-2609 |
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Keywords |
Optimal control problem ; low-regret control ; pointwise control ; finite element method ; a priori error estimates |
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In this paper we give a priori error estimates for finite element approximations of linear parabolicproblems with pointwise control and incomplete data. We discretise the optimal control problemby using piecewise linear and continuous finite elements for the space discretisation of the state,and we use the backward Euler scheme for time discretisation. We prove a priori error estimates forthe state, the adjoint-state as well as for the low-regret pointwise optimal control. |
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TAYLOR & FRANCIS LTD |
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EcoFoG @ webmaster @ |
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935 |
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Author |
Robillard, T.; ter Hofstede, H.M.; Orivel, J.; Vicente, N.M. |
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Title |
Bioacoustics of the Neotropical Eneopterinae (Orthoptera, Grylloidea, Gryllidae) |
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Journal Article |
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Year |
2015 |
Publication |
Bioacoustics |
Abbreviated Journal |
Bioacoustics |
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24 |
Issue |
2 |
Pages |
123-143 |
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In members of the cricket subfamily Eneopterinae (Orthoptera, Grylloidea), songs with powerful high-frequency (HF) harmonics have evolved, which likely represents a distinctive acoustic adaptation. In this study, we analysed or reanalysed the songs of the three eneopterine genera present in the Neotropics to evaluate whether they also possess high-amplitude HF components. We present new data and combine several lines of evidence to interpret or reinterpret the calling signals of a representative species for each genus. We used new recordings in order to detect and analyse potential HF components of the songs. Stridulatory files were measured, and stridulation was studied using high-speed video recordings. The results suggest that all eneopterine genera from the Neotropics use HFs to communicate, based on the rich harmonic content of their songs. Strikingly, the Neotropical eneopterines possess high dominant frequencies, recalling the patterns observed in the tribe Lebinthini, the most speciose tribe of the subfamily distributed in the Western Pacific region and in Southeast Asia: Ligypterus and Ponca show dominant harmonic peaks, whereas Eneoptera possesses unique features. The three species under study, however, deal differently with HFs. |
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Taylor & Francis |
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0952-4622 |
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doi: 10.1080/09524622.2014.996915 |
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EcoFoG @ webmaster @ |
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651 |
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Zhang, T.; Bai, S.L.; Zhang, Y.F.; Thibaut, B. |
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Title |
Viscoelastic properties of wood materials characterized by nanoindentation experiments |
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Journal Article |
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Year |
2012 |
Publication |
Wood Science and Technology |
Abbreviated Journal |
Wood Sci. Technol. |
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46 |
Issue |
5 |
Pages |
1003-1016 |
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Springer-Verlag |
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0043-7719 |
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EcoFoG @ webmaster @ |
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465 |
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Roggy, J.C.; Moiroud, A.; Lensi, R.; Domenach, A.M. |
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Estimating N transfers between N-2-fixing actinorhizal species and the non-N-2-fixing Prunus avium under partially controlled conditions |
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Journal Article |
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2004 |
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Biology and Fertility of Soils |
Abbreviated Journal |
Biol. Fertil. Soils |
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39 |
Issue |
5 |
Pages |
312-319 |
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Keywords |
actinorhizal trees; mixed culture; litter; N transfer by roots; N-15 |
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Two methods of N transfer between plants-by litter decomposition and root-to-root exchange-were examined in mixed plantations of N-fixing and non-fixing trees. Nitrogen transfers from decaying litters were measured by placing N-15-labelled litters from four actinorhizal tree species around shoots of containerized Prunus avium. Nitrogen transfers by root-to-root exchanges were measured after foliar NO3-N-15 fertilization of Alnus subcordata and Elaeagnus angustifolia growing in containers in association with P. avium. During the first 2 years of litter decomposition, from 5-20% of the N, depending on the litter identity, was released and taken up by P. avium. N availability in the different litters was strongly correlated with the amount of water-soluble N, which was highest in leaves of E. angustifolia. In the association between fixing and non-fixing plants, 7.5% of the A. subcordata N and 25% of E. angustifolia N was transferred to P. avium by root exchange. These results showed that the magnitude of N transfers by root exchange depended on the associated N-2-fixing species. Among the species investigated, E. angustifolia displayed the highest capacity for exudating N from roots as well as for releasing N from litters. These qualities make this tree a promising species for enhancing wood yields in mixed stands. |
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INRA, ENGREF, CIRAD, Unite Mixte Rech,Lab Ecol Forets Trop Guyane, Kourou 97387, French Guiana, Email: roggy.j@cirad.fr |
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SPRINGER-VERLAG |
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0178-2762 |
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ISI:000221197000002 |
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EcoFoG @ eric.marcon @ |
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236 |
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Author |
Quilichini, A.; Macquart, D.; Barabe, D.; Albre, J.; Gibernau, M. |
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Title |
Reproduction of the West Mediterranean endemic Arum pictum (Araceae) on Corsica |
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Journal Article |
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Year |
2010 |
Publication |
Plant Systematics and Evolution |
Abbreviated Journal |
Plant Syst. Evol. |
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Volume |
287 |
Issue |
3-4 |
Pages |
179-187 |
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Keywords |
Floral volatiles; Ocimene; Insect pollination; Reproductive success; Sphaeroceridae; Thermogenesis |
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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. |
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[Quilichini, Angelique; Gibernau, Marc] CNRS, UMR 8172, Ecole Forets Guyane, F-97387 Kourou, France, Email: marc.gibernau@ecofog.gf |
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SPRINGER WIEN |
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0378-2697 |
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ISI:000279479800008 |
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EcoFoG @ eric.marcon @ |
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51 |
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Barabe, D.; Lacroix, C.; Gibernau, M. |
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Title |
Floral development of Urospatha: merosity and phylogeny in the Lasioideae (Araceae) |
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Journal Article |
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Year |
2011 |
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Plant Systematics and Evolution |
Abbreviated Journal |
Plant Syst. Evol. |
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Volume |
296 |
Issue |
1-2 |
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41-50 |
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Inflorescence; Homeosis; Angiosperms; Systematic; Morphogenetic constraints |
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In this paper we study merosity in the genus Urospatha within the framework of a resolved phylogeny of the Araceae. We analyse how a transition from dimerous or tetramerous merosity to pentamerous or hexamerous merosity can occur developmentally in the Lasioideae. In Urospatha, initiation of floral primordia along the inflorescence is acropetal, while development of flowers is basipetal. This indicates the presence of two distinct phases in the development of the Urospatha inflorescence. The first phase corresponds to initiation of flowers and establishment of the phyllotactic pattern, and the second phase to differentiation of floral organs. Urospatha is characterized by the presence of trimerous, tetramerous, pentamerous and rarely hexamerous flowers. In all types of flowers, the stamens are closely associated and opposite to the tepals. Pentamerous flowers are formed by addition of a sector comprising a stamen and tepal. Likewise, in the case of hexamerous flowers, two sectors are added. In the Lasioideae, the increase in the number of tepals and stamens is linked with two developmental processes that have appeared independently in the subfamily: (1) addition of one or two stamen-petal sectors (Anaphyllopsis and Urospatha), and (2) independent increase in the number of tepals and stamens on whorls, more or less organized and inserted in alternate position (Dracontium). Tetramerous whorls as they occur in basal Lasioideae would be homologous to two dimerous whorls from an evolutionary point of view. |
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[Barabe, D; Gibernau, M] CNRS UMR Ecol Forets Guyane 8172, F-97387 Kourou, France, Email: denis.barabe@umontreal.ca |
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Springer Wien |
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0378-2697 |
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WOS:000294201300004 |
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EcoFoG @ webmaster @ |
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338 |
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Dejean, A.; Labrière, N.; Touchard, A.; Petitclerc, F.; Roux, O. |
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Title |
Nesting habits shape feeding preferences and predatory behavior in an ant genus |
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Journal Article |
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2014 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
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Volume |
101 |
Issue |
4 |
Pages |
323-330 |
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Ant genus Pseudomyrmex; Arboreal and ground nesting; Feeding preferences; Myrmecophytism; Predation |
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We tested if nesting habits influence ant feeding preferences and predatory behavior in the monophyletic genus Pseudomyrmex (Pseudomyrmecinae) which comprises terrestrial and arboreal species, and, among the latter, plant-ants which are obligate inhabitants of myrmecophytes (i.e., plants sheltering so-called plant-ants in hollow structures). A cafeteria experiment revealed that the diet of ground-nesting Pseudomyrmex consists mostly of prey and that of arboreal species consists mostly of sugary substances, whereas the plant-ants discarded all the food we provided. Workers forage solitarily, detecting prey from a distance thanks to their hypertrophied eyes. Approach is followed by antennal contact, seizure, and the manipulation of the prey to sting it under its thorax (next to the ventral nerve cord). Arboreal species were not more efficient at capturing prey than were ground-nesting species. A large worker size favors prey capture. Workers from ground- and arboreal-nesting species show several uncommon behavioral traits, each known in different ant genera from different subfamilies: leaping abilities, the use of surface tension strengths to transport liquids, short-range recruitment followed by conflicts between nestmates, the consumption of the prey's hemolymph, and the retrieval of entire prey or pieces of prey after having cut it up. Yet, we never noted group ambushing. We also confirmed that Pseudomyrmex plant-ants live in a kind of food autarky as they feed only on rewards produced by their host myrmecophyte, or on honeydew produced by the hemipterans they attend and possibly on the fungi they cultivate. © 2014 Springer-Verlag Berlin Heidelberg. |
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Address |
IRD, MIVEGEC (IRD 224-CNRS 5290-UM1-UM2), Équipe BEES, 911 avenue Agropolis, 34394 Montpellier Cedex 5, France |
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Springer Verlag |
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00281042 (Issn) |
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Export Date: 5 May 2014; Source: Scopus; Coden: Natwa; Language of Original Document: English; Correspondence Address: Dejean, A.; CNRS, Écologie des Forêts de Guyane (UMR-CNRS 8172), Campus Agronomique, BP 316, 97379 Kourou cedex, France; email: alain.dejean@wanadoo.fr |
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EcoFoG @ webmaster @ |
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539 |
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