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Levionnois, S.; Tysklind, N.; Nicolini, E.; Ferry, B.; Troispoux, V.; Le Moguedec, G.; Morel, H.; Stahl, C.; Coste, S.; Caron, H.; Heuret, P. |
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Title |
Soil variation response is mediated by growth trajectories rather than functional traits in a widespread pioneer Neotropical tree |
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Journal Article |
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2020 |
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bioRxiv, peer-reviewed by Peer Community in Ecology |
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351197 |
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v4 |
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Trait-environment relationships have been described at the community level across tree species. However, whether interspecific trait-environment relationships are consistent at the intraspecific level is yet unknown. Moreover, we do not know how consistent is the response between organ vs. whole-tree level.We examined phenotypic variability for 16 functional leaf (dimensions, nutrient, chlorophyll) and wood traits (density) across two soil types, Ferralitic Soil (FS) vs. White Sands (WS), on two sites for 70 adult trees of Cecropia obtusa Trécul (Urticaceae) in French Guiana. Cecropia is a widespread pioneer Neotropical genus that generally dominates early successional forest stages. To understand how soil types impact resource-use through the processes of growth and branching, we examined the architectural development with a retrospective analysis of growth trajectories. We expect soil types to affect both, functional traits in relation to resource acquisition strategy as already described at the interspecific level, and growth strategies due to resource limitations with reduced growth on poor soils.Functional traits were not involved in the soil response, as only two traits-leaf residual water content and K content-showed significant differences across soil types. Soil effects were stronger on growth trajectories, with WS trees having the slowest growth trajectories and less numerous branches across their lifespan.The analysis of growth trajectories based on architectural analysis improved our ability to characterise the response of trees with soil types. The intraspecific variability is higher for growth trajectories than functional traits for C. obtusa, revealing the complementarity of the architectural approach with the functional approach to gain insights on the way trees manage their resources over their lifetime. Soil-related responses of Cecropia functional traits are not the same as those at the interspecific level, suggesting that the effects of the acting ecological processes are different between the two levels. Apart from soil differences, much variation was found across sites, which calls for further investigation of the factors shaping growth trajectories in tropical forests. |
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EcoFoG @ webmaster @ |
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931 |
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Wagner, F.; Rutishauser, E.; Blanc, L.; Herault, B. |
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Title |
Effects of Plot Size and Census Interval on Descriptors of Forest Structure and Dynamics |
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Journal Article |
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Year |
2010 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
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42 |
Issue |
6 |
Pages |
664-671 |
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Amazonia; biomass fluxes; coefficient of variation; forest permanent plots; turnover rates; WinBUGS |
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This study was designed to explicitly formulate the effect of census interval and plot size on the variability of descriptors of tropical forest structure (stand density, basal area, aboveground biomass [AGB]) and dynamic (tree growth, mortality and recruitment rates, biomass fluxes). A unique dataset from a broad plot network (37.5 ha) surveyed every 2 yr over a 16-yr period was used to develop and parameterize a new statistical model predicting the coefficients of variation for each forest descriptor. More than 90 percent of the inherent variability of these coefficients was predicted using a simple model including plot size and census interval in a Bayesian modeling framework. All descriptors of forest structure varied by <10 percent for plot sizes 42 ha. Among the descriptors of forest dynamics, AGB loss was the most variable. The number of 6.25 ha plots required to estimate its mean, over a 16-yr period, within a 20 percent error of the mean remains above four. This contrasts with a relative constant flux of biomass entering the plot through tree growth and tree recruitment. Tree growth was remarkably well estimated with <15 percent variability for a 2-yr census in a plot of 2 ha. This study provides an easy method to assess dataset limitations in efforts to estimate descriptors of forest structure and dynamic, which is of primary importance to decipher any clear consequences of global change in tropical forests. |
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[Wagner, Fabien; Herault, Bruno] Univ Antilles Guyane, UMR Ecol Forets Guyane, Kourou 97379, French Guiana, Email: bruno.herault@ecofog.gf |
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WILEY-BLACKWELL PUBLISHING, INC |
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0006-3606 |
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ISI:000283949700006 |
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EcoFoG @ eric.marcon @ |
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16 |
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Vantaux, A.; Roux, O.; Magro, A.; Ghomsi, N.T.; Gordon, R.D.; Dejean, A.; Orivel, J. |
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Title |
Host-Specific Myrmecophily and Myrmecophagy in the Tropical Coccinellid Diomus thoracicus in French Guiana |
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Journal Article |
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Year |
2010 |
Publication |
Biotropica |
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Biotropica |
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42 |
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5 |
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622-629 |
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Keywords |
ants; ladybird; mimicry; parasite; Wasmannia auropunctata |
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A variety of arthropods, particularly insects, have developed myrmecophilous interactions with ants to gain access to resources and/or for protection. Among these myrmecophiles, only a few examples have been documented in the Coccinellidae, most of them involving species able to feed on ant-tended Hemiptera. We report here a new case of obligate myrmecophily in the coccinellid Diomus thoracicus. Larvae are invariably and exclusively found in the nests of the ant Wasmannia auropunctata and seem to rely on ant brood as their only food source. Not only do ant workers show no aggressiveness toward the D. thoracicus larvae in their behavioral interactions at the colonial level, but also at the species level; while coccinellid adults are always attacked. The integration of the larvae inside of the ant nests is based on their chemical mimicry of the host's cuticular cues. Therefore, given the presence of the D. thoracicus larvae inside of the ant's nest, their predation on Wasmannia brood and their chemical mimicry, this species can be considered a specific parasite of W. auropunctata. Overall, this new case of myrmecophily not only specifically involves a highly invasive ant species, but also provides insights into the evolution of myrmecophily and myrmecophagy in coccinellids. |
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[Vantaux, Amelie; Magro, Alexandra; Orivel, Jerome] Univ Toulouse, UPS, EDB Lab Evolut & Diversite Biol, F-31062 Toulouse, France, Email: orivel@cict.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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0006-3606 |
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ISI:000281707700025 |
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EcoFoG @ eric.marcon @ |
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27 |
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Ruiz-Gonzalez, M.X.; Corbara, B.; Leroy, C.; Dejean, A.; Orivel, J. |
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Title |
The Weaver Wasp: Spinning Fungus into a Nest |
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Journal Article |
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2010 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
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42 |
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4 |
Pages |
402-404 |
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Allomerus decemarticulatus; French Guiana; Hirtella physophora; nest architecture; Nitela constructor; wasp biology |
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Wasp nests range from simple to complex structures made of paper or mud. Here, we show that a Neotropical wasp of the genus Nitela builds its nest entirely by weaving endophytic fungal hyphae and spider silk harvested from the leaves growing in the understory of the rain forest in French Guiana. |
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[Ruiz-Gonzalez, Mario X.; Orivel, Jerome] Univ Toulouse, UPS, EDB, Lab Evolut & Divers Biol, F-31062 Toulouse, France, Email: orivel@cict.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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0006-3606 |
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ISI:000279438900002 |
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EcoFoG @ eric.marcon @ |
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54 |
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Baraloto, C.; Couteron, P. |
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Title |
Fine-scale Microhabitat Heterogeneity in a French Guianan Forest |
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Journal Article |
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2010 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
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42 |
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4 |
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420-428 |
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canopy gap; geostatistics; light availability; microclimate; soil moisture; soil nutrients; topography |
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We examined fine-scale heterogeneity of environmental conditions in a primary rain forest in French Guiana to describe variation in microhabitats that plants may experience during establishment. We characterized both the range as well as the spatial structuring of 11 environmental factors important for seedling establishment in six hexagonal sampling grids, one each in gap and understory sites at three points representing the predominant geomorphic units in this primary forest. Each grid contained 37 sampling points separated by 31 cm-20 m. Monte-Carlo tests of semivariograms against complete spatial randomness indicated that for many variables in all six sampling grids, spatial dependence did not exceed 1 m. A principal component analysis of all sampling points revealed a lack of spatial microhabitat structure, rather than homogeneous patches associated with canopy structure or geomorphology. Our results suggest that ample fine-scale spatial heterogeneity exists to support the coexistence of plant species with differential abiotic requirements for regeneration. |
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[Baraloto, Christopher] INRA, UMR Ecol Forets Guyane, F-97387 Kourou, France, Email: chris.baraloto@ecofog.gf |
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WILEY-BLACKWELL PUBLISHING, INC |
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0006-3606 |
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ISI:000279438900005 |
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EcoFoG @ eric.marcon @ |
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55 |
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Author |
Paine, C.E.T.; Harms, K.E.; Schnitzer, S.A.; Carson, W.P. |
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Title |
Weak competition among tropical tree seedlings: Implications for species coexistence |
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Journal Article |
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Year |
2008 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
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40 |
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4 |
Pages |
432-440 |
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Brosimum alicastrum; competitive irrelevance; maintenance of biodiversity; Matisia cordata; resource competition; Panama; Peru; Pouteria reticulata; zone of influence |
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The intensity of competition among forest tree seedlings is poorly understood, but has important ramifications for their recruitment and for the maintenance of species diversity. Intense competition among seedlings could allow competitively dominant species to exclude subordinate species. Alternatively, the low density and small stature of forest tree seedlings could preclude intense interseedling competition. In this case, other processes, such as size-asymmetric competition with adults, interactions with consumers, or neutral dynamics would prevail as those structuring the forest understory. We tested the intensity of, and potential for, intraspecific competition among tree seedlings of three species (Brosimum alicastrum, Matisia cordata, and Pouteria reticulata) in two Neotropical rain forests. We reduced stem densities by up to 90 percent and monitored individual growth and survival rates for up to 24 mo. Individual growth and survival rates were generally unrelated to stem density. Contrary to the predicted behavior of intensely competing plant populations, the distribution of individual heights did not become more left-skewed with time for any species, regardless of plot density; i.e., excesses of short, suppressed individuals did not accumulate in high-density plots. We further measured the overlap of zones of influence (ZOIs) to assess the potential for resource competition. Seedling ZOIs overlapped only slightly in extremely dense monodominant plots, and even less in ambient-density plots of mixed composition. Our results thus suggest that interseedling competition was weak. Given the low density of tree seedlings in Neotropical forests, we infer that resource competition among seedlings may be irrelevant to their recruitment. |
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[Paine, C. E. Timothy; Harms, Kyle E.] Louisiana State Univ, Dept Biol Sci, Baton Rouge, LA 70803 USA, Email: cetpaine@gmail.com |
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BLACKWELL PUBLISHING |
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0006-3606 |
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ISI:000257717500006 |
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EcoFoG @ eric.marcon @ |
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134 |
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Degen, B.; Roubilk, D.W. |
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Effects of animal pollination on pollen dispersal, selfing, and effective population size of tropical trees: A simulation study |
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Journal Article |
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2004 |
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Biotropica |
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Biotropica |
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36 |
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2 |
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165-179 |
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Amazon; bees; Brazil; Dipteryx; Jacaranda; model; pollination; sensitivity analysis; trees |
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Animals, especially insects, are principal pollen vectors of tropical trees and have behavior patterns that affect gene dispersal. Here, we explore complex pollination systems using a new simulation model Eco-Gene and considering, among other factors, flowering synchrony. spatial distribution of trees, degree of selfing, population densities, pollinator flight distances, pollen deposition, and pollinator response to floral display size. Sensitivity analyses using two contrasting tree data sets (Jacaranda copaia and Dipteryx odorata) determined the importance of each parameter on three response variables: the proportion of seeds from self-pollination, effective population size, and pollen dispersal. Spatial considerations and attractiveness of floral displays were prominent features determining the population genetic result of pollinators, and some biological implications of the results are discussed. |
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INRA, Kourou 97387, French Guiana, Email: degen_b@kourou.cirad.fr |
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ASSOC TROPICAL BIOLOGY INC |
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0006-3606 |
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ISI:000222092900006 |
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EcoFoG @ eric.marcon @ |
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264 |
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Stahl, C.; Burban, B.; Wagner, F.; Goret, J.-Y.; Bompy, F.; Bonal, D. |
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Title |
Influence of Seasonal Variations in Soil Water Availability on Gas Exchange of Tropical Canopy Trees |
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Journal Article |
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Year |
2013 |
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Biotropica |
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45 |
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2 |
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155-164 |
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French Guiana; Photosynthesis; Predawn leaf water potential; Rain forest; Relative extractable water; Respiration; Soil drought; Transpiration |
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Seasonal variations in environmental conditions influence the functioning of the whole ecosystem of tropical rain forests, but as yet little is known about how such variations directly influence the leaf gas exchange and transpiration of individual canopy tree species. We examined the influence of seasonal variations in relative extractable water in the upper soil layers on predawn leaf water potential, saturated net photosynthesis, leaf dark respiration, stomatal conductance, and tree transpiration of 13 tropical rain forest canopy trees (eight species) over 2 yr in French Guiana. The canopies were accessed by climbing ropes attached to the trees and to a tower. Our results indicate that a small proportion of the studied trees were unaffected by soil water depletion during seasonal dry periods, probably thanks to efficient deep root systems. The trees showing decreased tree water status (i.e., predawn leaf water potential) displayed a wide range of leaf gas exchange responses. Some trees strongly regulated photosynthesis and transpiration when relative extractable water decreased drastically. In contrast, other trees showed little variation, thus indicating good adaptation to soil drought conditions. These results have important applications to modeling approaches: indeed, precise evaluation and grouping of these response patterns are required before any tree-based functional models can efficiently describe the response of tropical rain forest ecosystems to future changes in environmental conditions. © 2012 by The Association for Tropical Biology and Conservation. |
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INRA, UMR 1137 Université de Lorraine, INRA Nancy 'Ecologie et Ecophysiologie Forestière', Champenoux 54280, France |
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Export Date: 13 March 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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474 |
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Baraloto, C.; Molto, Q.; Rabaud, S.; Herault, B.; Valencia, R.; Blanc, L.; Fine, P.V.A.; Thompson, J. |
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Rapid simultaneous estimation of aboveground biomass and tree diversity across neotropical forests: A comparison of field inventory methods |
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Journal Article |
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Year |
2013 |
Publication |
Biotropica |
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Biotropica |
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45 |
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3 |
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288-298 |
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Biodiversity assessment; carbon stocks; Monitoring; Permanent plot; Survey; Tropical rain forest |
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A standardized rapid inventory method providing information on both tree species diversity and aboveground carbon stocks in tropical forests will be an important tool for evaluating efforts to conserve biodiversity and to estimate the carbon emissions that result from deforestation and degradation (REDD). Herein, we contrast five common plot methods differing in shape, size, and effort requirements to estimate tree diversity and aboveground tree biomass (AGB). We simulated the methods across six Neotropical forest sites that represent a broad gradient in forest structure, tree species richness, and floristic composition, and we assessed the relative performance of methods by evaluating the bias and precision of their estimates of AGB and tree diversity. For a given sample of forest area, a 'several small' (< 1 ha) sampling strategy led to a smaller coefficient of variation (CV) in the estimate of AGB than a 'few large' one. The effort (person-days) required to achieve an accurate AGB estimate (< 10% CV), however, was greater for the smallest plots (0.1 ha) than for a compromise approach using 0.5 ha modified Gentry plots, which proved to be the most efficient method to estimate AGB across all forest types. Gentry plots were also the most efficient at providing accurate estimates of tree diversity (< 10% CV of Hill number). We recommend the use of the 0.5 ha modified Gentry plot method in future rapid inventories, and we discuss a set of criteria that should inform any choice of inventory method. © 2012 The Author(s) Journal compilation © 2012 by The Association for Tropical Biology and Conservation. |
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Centre for Ecology and Hydrology, Bush Estate, Penicuik, Midlothian, EH26 0QB, United Kingdom |
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00063606 (Issn) |
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Export Date: 16 May 2013; Source: Scopus; Coden: Btroa; :doi 10.1111/btp.12006; Language of Original Document: English; Correspondence Address: Baraloto, C.; INRA, UMR 'Ecologie des Forêts de Guyane', 97387, Kourou Cedex, French Guiana; email: chris.baraloto@ecofog.gf |
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EcoFoG @ webmaster @ |
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485 |
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Author |
Biwolé, A.B.; Dainou, K.; Fayolle, A.; Hardy, O.J.; Brostaux, Y.; Coste, S.; Delion, S.; Betti, J.L.; Doucet, J.-L. |
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Title |
Light Response of Seedlings of a Central African Timber Tree Species, Lophira alata (Ochnaceae), and the Definition of Light Requirements |
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Journal Article |
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2015 |
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Biotropica |
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Biotropica |
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47 |
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6 |
Pages |
681-688 |
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biomass allocation; Central Africa; light requirement: Lophira alata; population; relative growth rate; seedling growth; timber species; Afrique centrale; allocation de biomasse; besoins en lumière; croissance des semis; bois d'œuvre; Lophira alata; population; taux de croissance relatif |
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Light is of primary importance in structuring tropical tree communities. Light exposure at seedling and adult stages has been used to characterize the ecological profile of tropical trees, with many implications in forest management and restoration ecology. Most shade-tolerance classification systems have been proposed based on empirical observations in a specific area and thus result in contradictions among categories assigned to a given species. In this study, we aimed to quantify the light requirements for seedling growth of a Central African timber tree, Lophira alata (Ochnaceae), taking into account effects of population origin. In two controlled experiments: a light response experiment and a comparative population experiment, conducted in southwestern Cameroon, using seeds collected from four populations (three from Cameroon and one from Gabon), we examined the quantitative responses to irradiance of seedlings. After 2 years, mortality was very low (<3%), even in extremely low irradiance. Growth and biomass allocation patterns varied in response to light, with intermediate irradiance (24–43%) providing optimal conditions. Light response differed between populations. The Boumba population in the northeastern edge of the species' distribution exhibited the highest light requirements, suggesting a local adaptation. As a result of positive growth at low irradiance and maximum growth at intermediate irradiance, we concluded that L. alata exhibits characteristics of both non-pioneer and pioneer species. Implications of our results to propose an objective way to assign the light requirement for tropical tree species are discussed. |
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1744-7429 |
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no |
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EcoFoG @ webmaster @ |
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648 |
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