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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. |
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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 |
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Year |
2012 |
Publication |
Atmospheric Chemistry And Physics |
Abbreviated Journal |
Atmos. Chem. Phys. |
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Volume |
12 |
Issue |
4 |
Pages |
1923-1950 |
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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. |
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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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Copernicus Gesellschaft Mbh |
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Language |
English |
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ISSN |
1680-7316 |
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Notes |
WOS:000300875900016 |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
464 |
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Author |
Seymour, R.S.; White, C.R.; Gibernau, M. |
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Title |
Endothermy of dynastine scarab beetles (Cyclocephala colasi) associated with pollination biology of a thermogenic arum lily (Philodendron solimoesense) |
Type |
Journal Article |
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Year |
2009 |
Publication |
Journal of Experimental Biology |
Abbreviated Journal |
J. Exp. Biol. |
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Volume |
212 |
Issue |
18 |
Pages |
2960-2968 |
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Keywords |
beetle; endothermy; pollination biology; Cyclocephala; Philodendron |
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Abstract |
Cyclocephala colasi beetles are facultative endotherms that spend most of their adult lives inside the inflorescences of Philodendron solimoesense, where ambient temperature (T-a) averages about 28 degrees C due to floral thermogenesis. Measurements of respiration within a range of T-a showed that active beetles became spontaneously endothermic at T-a below 28 degrees C but were rarely endothermic above it. There was no evidence of endothermy within the inflorescences, indicating that activities in the floral chamber can occur without the high energy expense of endothermy. Bouts of endothermy occurred at lower T-a in respirometer chambers mainly in the evening, when the insects normally fly from one inflorescence to another, and during the night, when they normally eat and mate within the inflorescence. Patterns of endothermy in individual episodes were studied in non-flying beetles with respirometry and infrared thermal imaging. Heat was generated in the thorax by oscillatory waves of respiration that were coupled with thoracic temperature (T-th) increases. Stationary beetles could regulate T-th at about 33 degrees C independently of T-a between 16 and 29 degrees C. At T-a=20 degrees C, this represents a 116-fold increase in metabolic rate over resting, ectothermic values. Endothermy was clearly a requirement for flight, and beetles departing inflorescences warmed to about 30 degrees C before take-off. During flight, T-th was dependent on T-a, decreasing from 37 to 28 degrees C at T-a of 37 to 20 degrees C, respectively. The lowest T-a at which flight could occur was about 20 degrees C. Thermal conductance of stationary, endothermic beetles increased at higher metabolic rates, probably because of increased ventilatory heat loss. |
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Address |
[Seymour, Roger S.] Univ Adelaide, Sch Earth & Environm Sci, Adelaide, SA 5005, Australia, Email: roger.seymour@adelaide.edu.au |
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COMPANY OF BIOLOGISTS LTD |
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ISSN |
0022-0949 |
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Notes |
ISI:000269383500014 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
198 |
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Author |
Guitet, S.; Blanc, L.; Trombe, P.J.; Lehallier, B. |
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Title |
Silvicultural Treatments in the Tropical Forests of Guiana: A Review of Ten Years of Trials |
Type |
Journal Article |
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Year |
2009 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
Bois For. Trop. |
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Volume |
63 |
Issue |
301 |
Pages |
7-19 |
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Keywords |
cutting cycle; thinning; stand dynamics; logging; French Guiana |
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Abstract |
This article reviews an experimental system set up in French Guiana to test different selective thinning methods that started ten to fifteen years after logging in order to reconstitute commercially viable stands within the shortest time. The thinning methods tested involve a combination of selective intervention within a radius of 10 metres around crop trees and systematic intervention applied uniformly to the entire forest parcel. The resulting thinning intensity produces an 8% to 45% reduction in basal area. While the growth of the residual stand is strongly boosted in all species and for all diameters, there is little change in basal area because of high mortality and lower recruitment of commercial species. Standing commercial capital, however, is strongly affected by the thinning operations as defined. In effect, these thinning methods that benefit crop stems do not meet the objective of shorter rotations in Guiana's tropical logging forests. On the other hand, the measurements made in under-treatment stands agree with those obtained at the Paracou experimental station and confirm the need to adopt long cutting cycles of more than fifty years to ensure that the extraction of valuable species is sustainable in the current logging context in French Guiana. |
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Address |
[Guitet, Stephane; Trombe, Pierre-Julien; Lehallier, Benoit] Direct Reg Guyane, Off Natl Forets, F-97307 Cayenne, France |
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Publisher |
CIRAD-CENTRE COOPERATION INT RECHERCHE AGRONOMIQUE POUR |
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ISSN |
0006-579X |
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Notes |
ISI:000272488700002 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
91 |
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Author |
Gond, V.; Guitet, S. |
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Title |
Remote Sensing in Post-Logging Diagnoses for Forest Management in French Guiana |
Type |
Journal Article |
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Year |
2009 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
Bois For. Trop. |
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Volume |
63 |
Issue |
299 |
Pages |
5-13 |
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Keywords |
selective logging; logging impact inspections; French Guiana; remote sensing; forest management |
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Abstract |
This study is part of the activities carried out to monitor tow-impact logging operations in humid tropical forests. The sustainability of these activities is highly dependent on the scale of logging damage, and managers therefore need to carry out effective checks on the quality of forestry work. In this study, remote sensing was used to track the extension of logging operations and to assess damage, through images acquired during and after logging in each parcel. Analysis of the high-resolution images (10 m) clearly identifies logged-over clearings and some skidding tracks, allowing assessments of gaps opening up in the canopy. Several parcels were monitored in this French Guiana study. A simple diagnostic procedure was established for each parcel to assess logging intensity and identify new logging tracks and timber losses. The remote sensing toot thus helps to make more accurate assessments of logging quality and to draw relevant conclusions for the logging company. The study has demonstrated the usefulness of remote sensing to identify damage after logging. The quality of restitution of the damage was validated by means of a database on the logging terrain and through field missions. This post-logging inspection tool can now be automated for fully operational use by forest managers. |
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Address |
[Gond, Valery] Univ Laval, Fac Foresterie, Umr Ecofog Guyane francaise, Cirad,UR 36, Quebec City, PQ G1V OA6, Canada |
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Publisher |
CIRAD-CENTRE COOPERATION INT RECHERCHE AGRONOMIQUE POUR |
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ISSN |
0006-579X |
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Notes |
ISI:000266156700001 |
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no |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
280 |
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Author |
Lehnebach, R.; Doumerc, L.; Clair, B.; Alméras, T. |
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Title |
Mechanical stress in the inner bark of 15 tropical tree species and the relationship with anatomical structure |
Type |
Journal Article |
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Year |
2020 |
Publication |
Botany |
Abbreviated Journal |
Bot. |
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Volume |
98 |
Issue |
1 |
Pages |
1-8 |
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Keywords |
Bark anatomical structure; Mechanical stress; Sclereids; Secondary phloem; Tree biomechanics; Tropical species |
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Abstract |
Recent studies have shown that the inner bark is implicated in the postural control of inclined tree stems through the interaction between wood radial growth and tangential expansion of a trellis fiber network in bark. Assessing the taxonomic extent of this mechanism requires a screening of the diversity in bark anatomy and mechanical stress. The mechanical state of bark was measured in 15 tropical tree species from various botanical families on vertical mature trees, and related to the anatomical structure of the bark. Significant tensile or compressive longitudinal stresses were observed in the stems of most species. Tensile longitudinal stress was observed in various botanical families and was always associated with fibers arranged in a trellis-like structure and strong dilatation of rays. The highest tensile stress was recorded in species with gelatinous fibers forming a treillis. Compressive stress was typically associated with a large amount of sclereids in the bark, supporting the differentiation of sclereids as a potential origin of the generation of longitudinal compressive stresses in bark. In species exhibiting both a fibrous trellis structure and a significant amount of sclereids, the sign of longitudinal stress may depend on the balance between these two mechanisms. |
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Address |
Faculty of Bioscience Engineering, Laboratory of Wood Technology, Woodlab, Coupure Links 653, Gent, B-9000, Belgium |
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Publisher |
Canadian Science Publishing |
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ISSN |
19162804 (Issn) |
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Notes |
Cited By :1; Export Date: 20 January 2020; Correspondence Address: Lehnebach, R.; Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier, CNRS, 860 rue de St. Priest, France; email: lehnebach.romain@hotmail.fr |
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no |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
913 |
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Author |
Roux, O.; Le Lann, C.; van Alphen, J.J.M.; van Baaren, J. |
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Title |
How does heat shock affect the life history traits of adults and progeny of the aphid parasitoid Aphidius avenae (Hymenoptera: Aphidiidae)? |
Type |
Journal Article |
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Year |
2010 |
Publication |
Bulletin of Entomological Research |
Abbreviated Journal |
Bull. Entomol. Res. |
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Volume |
100 |
Issue |
5 |
Pages |
543-549 |
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Keywords |
developmental rate; fecundity; heat stress; longevity; sex-specific effect; parasitic wasp |
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Abstract |
Because insects are ectotherms, their physiology, behaviour and fitness are influenced by the ambient temperature. Any changes in environmental temperatures may impact the fitness and life history traits of insects and, thus, affect population dynamics. Here, we experimentally tested the impact of heat shock on the fitness and life history traits of adults of the aphid parasitoid Aphidius avenae and on the later repercussions for their progeny. Our results show that short exposure (1h) to an elevated temperature (36 degrees C), which is frequently experienced by parasitoids during the summer, resulted in high mortality rates in a parasitoid population and strongly affected the fitness of survivors by drastically reducing reproductive output and triggering a sex-dependent effect on lifespan. Heat stress resulted in greater longevity in surviving females and in shorter longevity in surviving males in comparison with untreated individuals. Viability and the developmental rates of progeny were also affected in a sex-dependent manner. These results underline the ecological importance of the thermal stress response of parasitoid species, not only for survival, but also for maintaining reproductive activities. |
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Address |
[Roux, O.] Univ Toulouse 3, Lab Ecol Fonct, UMR 5245 CNRS UPS INPT, F-31062 Toulouse 04, France, Email: oroux@cict.fr |
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Publisher |
CAMBRIDGE UNIV PRESS |
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ISSN |
0007-4853 |
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Notes |
ISI:000282077700005 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
42 |
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Author |
Stahl, C.; Burban, B.; Bompy, F.; Jolin, Z.B.; Sermage, J.; Bonal, D. |
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Title |
Seasonal variation in atmospheric relative humidity contributes to explaining seasonal variation in trunk circumference of tropical rain-forest trees in French Guiana |
Type |
Journal Article |
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Year |
2010 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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Volume |
26 |
Issue |
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Pages |
393-405 |
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Keywords |
bark; drought; secondary growth; seasonality; tropical rain forest; water |
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Abstract |
Large seasonal variation in the rate of change in girth of tropical rain-forest tree species has been described, but its origin is still under debate. We tested whether this variation might be related to variation in atmospheric relative humidity through its influence on bark water content and thickness. Variation in trunk circumference of 182 adult trees was measured about twice a month in an undisturbed tropical rain forest over 18 mo using dendrometers. Furthermore, a laboratory experiment was conducted to test the direct influence of relative air humidity on bark water content and thickness. in the field, most trees displayed highly positive rates of change in girth at the onset of the wet season, while a quarter of the trees displayed negative changes during long dry seasons, whatever their total annual growth. This variation was correlated with environmental conditions, particularly with atmospheric relative humidity. Trees with high bark water content and thickness displayed a stronger decrease in girth during the dry season. in the chamber experiment, desiccation induced a decrease in the diameter of the trunk sections in tandem with a decrease in bark water content. As a result, seasonal variation in the rate of change in girth of tropical rain-forest trees reflects variation in trunk biophysical properties, through the influence of relative humidity on bark properties. but not directly variation in secondary growth. |
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Address |
[Stahl, Clement; Burban, Benoit; Bompy, Felix; Jolin, Zachari B.; Sermage, Juliette; Bonal, Damien] INRA, UMR Ecol Forets Guyane 745, Kourou 97387, French Guiana, Email: bonal@nancy.inra.fr |
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Publisher |
CAMBRIDGE UNIV PRESS |
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ISSN |
0266-4674 |
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Notes |
ISI:000279100600005 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
57 |
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Author |
Paine, C.E.T.; Harms, K.E.; Ramos, J. |
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Title |
Supplemental irrigation increases seedling performance and diversity in a tropical forest |
Type |
Journal Article |
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Year |
2009 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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Volume |
25 |
Issue |
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Pages |
171-180 |
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Keywords |
diversity; Estacion Biologica Los Amigos; habitat filtering; palms; Peru; precipitation; seasonality; seedling recruitment |
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Abstract |
Diversity is positively correlated with water availability at global, continental and regional scales. With the objective of better understanding the mechanisms that drive these relationships. we investigated the degree to which variation in water availability affects the performance (recruitment, growth a rid survival) of juvenile trees. Precipitation was supplemented throughout two dry seasons in a seasonal moist forest in south-eastern Peru. Supplementing precipitation by 160 mm mo(-1), we increased soil moisture by 17%. To generate seedling communities or known species composition, we sowed 3840 seeds of 12 species. We monitored the fates of the 554 seedlings recruited from the sown seeds. as well as 1856 older non-sown seedlings (10 cm <= height < 50 cm), and 2353 saplings (> 1 m tall). Watering significantly enhanced young seedling growth and survival, increasing stern density and diversity. Watering diminished the recruitment of species associated with upland forests, but increased the survival of both upland- and lowland-associated species. Though supplemental watering increased the growth of older seedlings. their density and diversity were unaffected. Sapling performance was insensitive to watering. We infer that variation in dry-season water availability may affect seedling community structure by differentially affecting recruitment and increasing overall survival. These results suggest that differential seedling recruitment and survival may contribute to the observed relationships between water availability, habitat associations and patterns of tree species richness. |
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Address |
[Paine, C. E. Timothy; Harms, Kyle E.] Louisiana State Univ, Dept Biol Sci, Baton Rouge, LA 70803 USA, Email: timothy.paine@ecofog.gf |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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Notes |
ISI:000264212400006 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
118 |
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Author |
Gibernau, M.; Orivel, J.; Dejean, A.; Delabie, J.; Barabe, D. |
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Title |
Flowering as a key factor in ant-Philodendron interactions |
Type |
Journal Article |
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Year |
2008 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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Volume |
24 |
Issue |
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Pages |
689-692 |
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Keywords |
Araceae; domatia; habitat; nest site; non-specific association; Philodendron solimoesense; territoriality |
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Abstract |
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Address |
[Gibernau, Marc; Orivel, Jerome] Univ Toulouse 3, Lab Evolut & Divers Biol, UMR CNRS 5174, F-31062 Toulouse 9, France, Email: gibernau@cict.fr |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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Notes |
ISI:000261254400012 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
128 |
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Author |
Baraloto, C.; Bonal, D.; Goldberg, D.E. |
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Title |
Differential seedling growth response to soil resource availability among nine neotropical tree species |
Type |
Journal Article |
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Year |
2006 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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Volume |
22 |
Issue |
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Pages |
487-497 |
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Keywords |
biomass allocation; Dicorynia; drought stress; Eperua; French Guiana; Goupia; Jacaranda; plasticity; Qualea; Recordorylon; relative growth rate; Sextonia; soil phosphorus; specific leaf area; Virola |
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Abstract |
Although the potential contribution to tropical tree species coexistence of niche differentiation along light gradients has received much attention, the degree to which species perform differentially along soil resource gradients remains unclear. To examine differential growth response to soil resources, we grew seedlings of nine tropical tree species at 6.0% of full sun for 12 mo in a factorial design of two soil types (clay and white sand), two phosphate fertilization treatments (control and addition of 100 mg P kg(-1)) and two watering treatments (field capacity and water limitation to one-third field capacity). Species differed markedly in biomass growth rate, but this hierarchy was almost completely conserved across all eight treatments. All species grew more slowly in sand than clay soils. and no species grew faster with phosphate additions. Only Eperua grandiflora and E. falcata showed significant growth increases in the absence of water limitation. Faster-growing species were characterized by high specific leaf area, high leaf allocation and high net assimilation rate but not lower root allocation. Slower-growing species exhibited greater plasticity in net assimilation rate. suggesting that tolerance of edaphic stress in these species is related more to stomatal control than to whole-plant carbon allocation. Although relative growth rate for biomass was correlated with both its physiological and morphological components. interspecific differences were best explained by differences in net assimilation rate across six of the eight treatments. A suite of traits including high assimilation and high specific leaf area maintains rapid growth rate of faster-growing species across a wide gradient of soil resources, but the lack of plasticity they exhibit may compromise their survival in the poorest soil environments. |
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Univ Michigan, Dept Ecol & Evolutionary Biol, Ann Arbor, MI 48109 USA, Email: baraloto.c@kourou.cirad.fr |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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ISI:000239975200001 |
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EcoFoG @ eric.marcon @ |
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178 |
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