| Records |
| Author |
Dejean, A.; Lachaud, J.P. |
| Title |
The hunting behavior of the African ponerine ant Pachycondyla pachyderma |
Type |
Journal Article |
| Year |
2011 |
Publication |
Behavioural Processes |
Abbreviated Journal  |
Behav. Processes |
| Volume |
86 |
Issue |
2 |
Pages |
169-173 |
| Keywords |
Hunting behavior; Feeding specialization; Behavioral flexibility; Ponerine ants; Pachycondyla; Myriapoda |
| Abstract |
The hunting behavior of the African ponerine ant Pachycondyla pachyderma, a semi-specialized centipede predator, appears well adapted to this kind of prey and shows a graded complexity according to the difficulty it has in overwhelming prey. Small prey (5-to-8-mm-long termites) were detected by contact and seized by the thorax while larger prey (>= 30-mm-long centipedes) were frequently detected from a distance and seized by the anterior-most part of their body. Termites and 30-mm-long lithobiomorph centipedes were not always stung, whereas stinging and even repeated stinging was needed for 50-mm-long geophilomorphs and scolopendromorphs. Moreover, overwhelming wide and heavy scolopendromorphs, which have better defensive abilities, involved the use of additional behaviors allowing the workers to capture them safely: venom spreading, and a peculiar stinging posture, the “fatal embrace”. Here the workers seize scolopendromorphs by an antenna or by one of their first legs, wrap themselves around the prey while maintaining their grip with their mandibles and legs, and slowly inject venom into the prey's ventral surface. Workers retrieve small prey solitarily while, for large geophilomorphs and scolopendromorphs, nestmates can be recruited at short range or even at long range through tandem running. (C) 2010 Elsevier B.V. All rights reserved. |
| Address |
[Dejean, Alain] CNRS, Ecol Forets Guyane UMR CNRS 8172, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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Elsevier Science Bv |
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0376-6357 |
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| Notes |
ISI:000287984900001 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
301 |
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| Author |
Dejean, A.; Djieto-Lordon, C.; Cereghino, R.; Leponce, M. |
| Title |
Ontogenetic succession and the ant mosaic: An empirical approach using pioneer trees |
Type |
Journal Article |
| Year |
2008 |
Publication |
Basic and Applied Ecology |
Abbreviated Journal |
Basic Appl. Ecol. |
| Volume |
9 |
Issue |
3 |
Pages |
316-323 |
| Keywords |
ant-plant relationships; dynamics of associations; myrmecophytes; species turnover; tropical rainforests |
| Abstract |
Arboreal ant mosaics have been intensively investigated, but what generates these mosaics remains poorly understood. In this paper, we hypothesize that the dynamics of arboreal ant mosaics could be better understood by examining the ontogenetic succession of ants in tropical trees. We used three African pioneer tree species as biological models. Lophira alata (Ochnaceae) is a long-lived species that does not furnish any reward (i.e., extra-floral nectaries [EFNs], shelter) to ants, Anthocleista vogelii (Gentianaceae) bears extremely well-developed EFNs, and Barteria fistulosa (Passifloraceae) is a long-lived myrmecophyte providing both EFNs and domatia. For both L. alata and A. vogelii, we noted a succession of different associated ants as the plants grew and aged. Ground-nesting, arborealforaging ant species were the first associates, followed by arboreal species that build nests with the leaves of their host trees, together with some species nesting opportunistically in pre-existing cavities. Carton-building Crematogaster species were the last in this succession. The presence of EFNs on A. vogelii slows species turnover, demonstrating that the plant exerts some control over its ant associates. The comparison with B. fistulosa, which generally remains associated with the same plant-ant species during its entire ontogeny, highlights the importance of the selective attractiveness of the trees for their associated ants – or, perhaps, the existence of plant filters that screen arriving ants. (C) 2007 Gesellschaft fur Okologie. Published by Elsevier GmbH. All rights reserved. |
| Address |
[Dejean, Alain] CNRS Guyane, UPS 2561, F-97300 Cayenne, France, Email: alain.dejean@wanadoo.fr |
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| Publisher |
ELSEVIER GMBH, URBAN & FISCHER VERLAG |
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Edition |
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| ISSN |
1439-1791 |
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| Notes |
ISI:000256734600013 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
138 |
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| Author |
Molina, L.; Broquet, G.; Imbach, P.; Chevallier, F.; Poulter, B.; Bonal, D.; Burban, B.; Ramonet, M.; Gatti, L.V.; Wofsy, S.C.; Munger, J.W.; Dlugokencky, E.; Ciais, P. |
| Title |
On the ability of a global atmospheric inversion to constrain variations of CO2 fluxes over Amazonia |
Type |
Journal Article |
| Year |
2015 |
Publication |
Atmospheric Chemistry and Physics |
Abbreviated Journal |
Atmospheric Chemistry and Physics |
| Volume |
15 |
Issue |
14 |
Pages |
8423-8438 |
| Keywords |
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| Abstract |
The exchanges of carbon, water and energy between the atmosphere and the Amazon basin have global implications for the current and future climate. Here, the global atmospheric inversion system of the Monitoring of Atmospheric Composition and Climate (MACC) service is used to study the seasonal and interannual variations of biogenic CO<inf>2</inf> fluxes in Amazonia during the period 2002-2010. The system assimilated surface measurements of atmospheric CO<inf>2</inf> mole fractions made at more than 100 sites over the globe into an atmospheric transport model. The present study adds measurements from four surface stations located in tropical South America, a region poorly covered by CO<inf>2</inf> observations. The estimates of net ecosystem exchange (NEE) optimized by the inversion are compared to an independent estimate of NEE upscaled from eddy-covariance flux measurements in Amazonia. They are also qualitatively evaluated against reports on the seasonal and interannual variations of the land sink in South America from the scientific literature. We attempt at assessing the impact on NEE of the strong droughts in 2005 and 2010 (due to severe and longer-than-usual dry seasons) and the extreme rainfall conditions registered in 2009. The spatial variations of the seasonal and interannual variability of optimized NEE are also investigated. While the inversion supports the assumption of strong spatial heterogeneity of these variations, the results reveal critical limitations of the coarse-resolution transport model, the surface observation network in South America during the recent years and the present knowledge of modelling uncertainties in South America that prevent our inversion from capturing the seasonal patterns of fluxes across Amazonia. However, some patterns from the inversion seem consistent with the anomaly of moisture conditions in 2009. © Author(s) 2015. |
| Address |
NOAA, Earth System Research Laboratory, Global Monitoring Division, Boulder, CO, United States |
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| Notes |
Export Date: 27 August 2015 |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
615 |
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| Author |
Siebicke, L.; Steinfeld, G.; Foken, T. |
| Title |
CO2-gradient measurements using a parallel multi-analyzer setup |
Type |
Journal Article |
| Year |
2011 |
Publication |
Atmospheric Measurement Techniques |
Abbreviated Journal |
Atmos. Meas. Tech. |
| Volume |
4 |
Issue |
3 |
Pages |
409-423 |
| Keywords |
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| Abstract |
Accurate CO2 concentration gradient measurements are needed for the computation of advective flux terms, which are part of the full Net Ecosystem Exchange (NEE) budget equation. A typical draw back of current gradient measurement designs in advection research is the inadequate sampling of complex flow phenomena using too few observation points in space and time. To overcome this draw back, a new measurement design is presented which allows the parallel measurement of several sampling points at a high frequency. Due to the multi-analyzer nature of the design, inter-instrument bias becomes more of a concern compared to conventional setups. Therefore a statistical approach is presented which allows for accurate observations of concentration gradients, which are typically small in relation to analyzer accuracy, to be obtained. This bias correction approach applies a conditional, time dependent signal correction. The correction depends on a mixing index based on cross correlation analysis, which characterizes the degree of mixing of the atmosphere between individual sample points. The approach assumes statistical properties of probability density functions (pdf) of concentration differences between a sample point and the field average which are common to the pdf's from several sample points. The applicability of the assumptions made was tested by Large Eddy Simulation (LES) using the model PALM and could be verified for a test case of well mixed conditions. The study presents concentration time series before and after correction, measured at a 2 m height in the sub-canopy at the FLUXNET spruce forest site Waldstein-Weidenbrunnen (DE-Bay), analyzes the dependence of statistical parameters of pdf's from atmospheric parameters such as stratification, quantifies the errors and evaluates the performance of the bias correction approach. The improvements that are achieved by applying the bias correction approach are one order of magnitude larger than possible errors associated with it, which is a strong incentive to use the correction approach. In conclusion, the presented bias correction approach is well suited for – but not limited to – horizontal gradient measurements in a multi-analyzer setup, which would not have been reliable without this approach. Finally, possible future improvements of the bias correction approach are outlined and further fields of application indicated. |
| Address |
[Siebicke, L.; Foken, T.] Univ Bayreuth, Dept Micrometeorol, Bayreuth, Germany, Email: lukas.siebicke@ecofog.gf |
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| Publisher |
Copernicus Gesellschaft Mbh |
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Edition |
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| ISSN |
1867-1381 |
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| Notes |
ISI:000288911000002 |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
303 |
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| Author |
Foken, T.; Meixner, F.X.; Falge, E.; Zetzsch, C.; Serafimovich, A.; Bargsten, A.; Behrendt, T.; Biermann, T.; Breuninger, C.; Dix, S.; Gerken, T.; Hunner, M.; Lehmann-Pape, L.; Hens, K.; Jocher, G.; Kesselmeier, J.; Luers, J.; Mayer, J.C.; Moravek, A.; Plake, D.; Riederer, M.; Rutz, F.; Scheibe, M.; Siebicke, L.; Sorgel, M.; Staudt, K.; Trebs, I.; Tsokankunku, A.; Welling, M.; Wolff, V.; Zhu, Z. |
| Title |
Coupling processes and exchange of energy and reactive and non-reactive trace gases at a forest site – results of the EGER experiment |
Type |
Journal Article |
| Year |
2012 |
Publication |
Atmospheric Chemistry And Physics |
Abbreviated Journal |
Atmos. Chem. Phys. |
| Volume |
12 |
Issue |
4 |
Pages |
1923-1950 |
| Keywords |
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| Abstract |
To investigate the energy, matter and reactive and non-reactive trace gas exchange between the atmosphere and a spruce forest in the German mountain region, two intensive measuring periods were conducted at the FLUXNET site DE-Bay (Waldstein-Weidenbrunnen) in September/October 2007 and June/July 2008. They were part of the project “ExchanGE processes in mountainous Regions” (EGER). Beyond a brief description of the experiment, the main focus of the paper concerns the coupling between the trunk space, the canopy and the above-canopy atmosphere. Therefore, relevant coherent structures were analyzed for different in- and above canopy layers, coupling between layers was classified according to already published procedures, and gradients and fluxes of meteorological quantities as well as concentrations of non-reactive and reactive trace compounds have been sorted along the coupling classes. Only in the case of a fully coupled system, it could be shown, that fluxes measured above the canopy are related to gradients between the canopy and the above-canopy atmosphere. Temporal changes of concentration differences between top of canopy and the forest floor, particularly those of reactive trace gases (NO, NO2, O-3, and HONO) could only be interpreted on the basis of the coupling stage. Consequently, only concurrent and vertically resolved measurements of micrometeorological (turbulence) quantities and fluxes (gradients) of trace compounds will lead to a better understanding of the forest-atmosphere interaction. |
| Address |
[Foken, T.; Serafimovich, A.; Biermann, T.; Dix, S.; Gerken, T.; Hunner, M.; Jocher, G.; Lueers, J.; Riederer, M.; Ruetz, F.; Siebicke, L.; Staudt, K.] Univ Bayreuth, Dept Micrometeorol, D-95440 Bayreuth, Germany, Email: thomas.foken@uni-bayreuth.de |
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| Publisher |
Copernicus Gesellschaft Mbh |
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English |
Summary Language |
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Edition |
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| ISSN |
1680-7316 |
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| Notes |
WOS:000300875900016 |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
464 |
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| Author |
Buckland, S.T.; Yuan, Y.; Marcon, E. |
| Title |
Measuring temporal trends in biodiversity |
Type |
Journal Article |
| Year |
2017 |
Publication |
AStA Advances in Statistical Analysis |
Abbreviated Journal |
AStA Advances in Statistical Analysis |
| Volume |
101 |
Issue |
4 |
Pages |
461-474 |
| Keywords |
Biodiversity measures; Diversity profiles; Geometric mean; Species similarity; Turnover measures |
| Abstract |
In 2002, nearly 200 nations signed up to the 2010 target of the Convention for Biological Diversity, ‘to significantly reduce the rate of biodiversity loss by 2010’. To assess whether the target was met, it became necessary to quantify temporal trends in measures of diversity. This resulted in a marked shift in focus for biodiversity measurement. We explore the developments in measuring biodiversity that was prompted by the 2010 target. We consider measures based on species proportions, and also explain why a geometric mean of relative abundance estimates was preferred to such measures for assessing progress towards the target. We look at the use of diversity profiles, and consider how species similarity can be incorporated into diversity measures. We also discuss measures of turnover that can be used to quantify shifts in community composition arising, for example, from climate change. © 2017, The Author(s). |
| Address |
UMR EcoFoG, AgroParisTech, Campus Agronomique, BP 316, Kourou, French Guiana, France |
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Cited By :1; Export Date: 2 November 2017 |
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no |
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EcoFoG @ webmaster @ |
Serial |
769 |
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Malé, P.-J.G.; Leroy, C.; Lusignan, L.; Petitclerc, F.; Quilichini, A.; Orivel, J. |
| Title |
The reproductive biology of the myrmecophyte, Hirtella physophora, and the limitation of negative interactions between pollinators and ants |
Type |
Journal Article |
| Year |
2015 |
Publication |
Arthropod-Plant Interactions |
Abbreviated Journal |
Arthropod-Plant Interactions |
| Volume |
9 |
Issue |
1 |
Pages |
23-31 |
| Keywords |
Ant-plant; Ant–pollinator interactions; Floral structure and display; Plant reproductive biology; Spatial and temporal segregation |
| Abstract |
Myrmecophytism occurs in plants that offer ants a nesting space and, often, food rewards in exchange for protection from predators and competitors. Such biotic protection by ants can, however, interfere with the activity of pollinators leading to potential negative consequences for the plant’s reproduction. In this study, we focused on the association between the understory myrmecophyte, Hirtella physophora (Chrysobalanaceae), and its obligate ant partner, Allomerus decemarticulatus (Myrmicinae). We investigated the reproductive biology of H. physophora and the putative mechanisms that may limit ant–pollinator conflict. Our results show that H. physophora is an obligate outcrosser, self-incompatible, and potentially insect-pollinated species. The reproduction of H. physophora relies entirely on pollen transfer by pollinators that are likely quite specific. Potential interference between flower-visiting insects during pollination may also be lessened by a spatial and temporal segregation of ant and pollinator activities, thus enabling pollen transfer and fruit production. © 2014, Springer Science+Business Media Dordrecht. |
| Address |
IRD, UMR AMAP (botAnique et bioinforMatique de l’Architecture des Plantes), Boulevard de la Lironde, TA A-51/PS2Montpellier Cedex 5, France |
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| Notes |
Export Date: 9 April 2015 |
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no |
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EcoFoG @ webmaster @ |
Serial |
593 |
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| Author |
Revel, N.; Alvarez, N.; Gibernau, M.; Espíndola, A. |
| Title |
Investigating the relationship between pollination strategies and the size-advantage model in zoophilous plants using the reproductive biology of Arum cylindraceum and other European Arum species as case studies |
Type |
Journal Article |
| Year |
2012 |
Publication |
Arthropod-Plant Interactions |
Abbreviated Journal |
Arthropod-Plant Interact. |
| Volume |
6 |
Issue |
1 |
Pages |
35-44 |
| Keywords |
Araceae; Flower evolution; Plant-insect interactions; Reproductive strategy; Sex allocation |
| Abstract |
The size-advantage model (SAM) explains the temporal variation of energetic investment on reproductive structures (i. e. male and female gametes and reproductive organs) in long-lived hermaphroditic plants and animals. It proposes that an increase in the resources available to an organism induces a higher relative investment on the most energetically costly sexual structures. In plants, pollination interactions are known to play an important role in the evolution of floral features. Because the SAM directly concerns flower characters, pollinators are expected to have a strong influence on the application of the model. This hypothesis, however, has never been tested. Here, we investigate whether the identity and diversity of pollinators can be used as a proxy to predict the application of the SAM in exclusive zoophilous plants. We present a new approach to unravel the dynamics of the model and test it on several widespread Arum (Araceae) species. By identifying the species composition, abundance and spatial variation of arthropods trapped in inflorescences, we show that some species (i. e. A. cylindraceum and A. italicum) display a generalist reproductive strategy, relying on the exploitation of a low number of dipterans, in contrast to the pattern seen in the specialist A. maculatum (pollinated specifically by two fly species only). Based on the model presented here, the application of the SAM is predicted for the first two and not expected in the latter species, those predictions being further confirmed by allometric measures. We here demonstrate that while an increase in the female zone occurs in larger inflorescences of generalist species, this does not happen in species demonstrating specific pollinators. This is the first time that this theory is both proposed and empirically tested in zoophilous plants. Its overall biological importance is discussed through its application in other non-Arum systems. © 2011 Springer Science+Business Media B.V. |
| Address |
CNRS-UMR 8172 Ecologie des Forêts de Guyane, BP 709, 97387 Kourou, France |
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18728855 (Issn) |
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Export Date: 21 March 2012; Source: Scopus; doi: 10.1007/s11829-011-9164-1; Language of Original Document: English; Correspondence Address: Espíndola, A.; Department of Ecology and Evolution, University of Lausanne, Biophore Building, 1015 Lausanne, Switzerland; email: MariaAnahi.Espindola@unil.ch |
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no |
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EcoFoG @ webmaster @ |
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384 |
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Roux, O.; Vantaux, A.; Petitclerc, F.; Orivel, J.; Dejean, A.; Billen, J. |
| Title |
Structural adaptations and mechanism of reflex bleeding in the larvae of the myrmecophilous ladybird Diomus thoracicus |
Type |
Journal Article |
| Year |
2017 |
Publication |
Arthropod Structure and Development |
Abbreviated Journal |
Arthropod Structure and Development |
| Volume |
46 |
Issue |
4 |
Pages |
529-536 |
| Keywords |
3D reconstruction; Coccinellidae; Myrmecophagous insect; Reflex bleeding; Ultrastructure |
| Abstract |
Reflex bleeding is an effective defensive mechanism against predators. When attacked, some insects emit hemolymph, which coagulates, quickly entangling their aggressor. Bleeding occurs at weak intersegmental membranes or through dedicated organs, which can be associated or not with glandular cells. Here, we describe the behavior and morphological structures involved in reflex bleeding in the larvae of the ladybird, Diomus thoracicus, which are intranidal parasites of the ant Wasmannia auropunctata. The larvae are tolerated by the ants thanks to odor mimicry, but some rare aggressive ant behaviors were observed that trigger reflex bleeding both at a pair of thoracic tubercles and a pair of posterodorsal abdominal humps. No glandular structure was found in association with these emission points, which suggests that the material emitted was hemolymph only. A 3D reconstruction suggested that reflex bleeding seems to be controlled by muscles whose contraction increases the internal hydrostatic pressure and pushes the hemolymph into a funnel-like structure with an opening to the outside. In D. thoracicus, the morphological structures involved in reflex bleeding are among the most complex and prominent described to date. © 2017 Elsevier Ltd |
| Address |
KU Leuven, Zoological Institute, Naamsestraat 59, box 2466, Leuven, Belgium |
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Export Date: 18 December 2017 |
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EcoFoG @ webmaster @ |
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778 |
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| Author |
Herault, B.; Honnay, O. |
| Title |
Using life-history traits to achieve a functional classification of habitats |
Type |
Journal Article |
| Year |
2007 |
Publication |
Applied Vegetation Science |
Abbreviated Journal |
Appl. Veg. Sci. |
| Volume |
10 |
Issue |
1 |
Pages |
73-80 |
| Keywords |
forest connectivity; functional group; habitat typology; land-use history; riverine forest; species functional unity |
| Abstract |
Question: To establish a habitat classification based on functional group co-occurrence that may help the drawing up of conservation plans. Location: Riverine forest fragments in the Grand-duche de Luxembourg, Europe. Methods: Forest fragments were surveyed for their abundance of vascular plants. These were clustered into emergent groups according to 14 life-traits related to plant dispersal, establishment and persistence. Forest fragments were classified according to similar distribution of the identified emergent groups. Environmental factors were related to the emergent group richness in each forest type using generalized linear models. Results: Contrary to former species centred classifications, only two groups of forests, each with clearly different emergent group composition and conservation requirements, were detected: (1) swamp forests characterized by anemogamous perennials, annuals and hydrochorous perennials and (2) moist forests characterized by barochorous perennials, small geophytes and zoochorous phanerophytes. From a conservation point of view, priority should be given to large swamp forest with intact flooding regimes. This is in accordance with the high wind and water dispersal capacities of their typical emergent groups. For the moist forests, conservation priorities should be high forest connectivity and historical continuity since dispersal and establishment of their characteristic emergent groups are highly limited. Conclusions: The described methodology, situated at an intermediate integration level between the individual species and whole community descriptors, takes advantage of both conservation plans built for single species and the synthetic power of broad ecological measures. |
| Address |
Univ Liege, Dept Environm Sci & Management, B-6700 Arlon, Belgium, Email: bruno.herault@cirad.fr |
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OPULUS PRESS UPPSALA AB |
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1402-2001 |
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ISI:000245934700009 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
218 |
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