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Dejean, A.; Lachaud, J.P. |
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Title  |
The hunting behavior of the African ponerine ant Pachycondyla pachyderma |
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Journal Article |
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2011 |
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Behavioural Processes |
Abbreviated Journal |
Behav. Processes |
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86 |
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2 |
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169-173 |
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Hunting behavior; Feeding specialization; Behavioral flexibility; Ponerine ants; Pachycondyla; Myriapoda |
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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. |
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[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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ISI:000287984900001 |
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EcoFoG @ webmaster @ |
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301 |
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Dejean, A.; Carpenter, J.M.; Corbara, B.; Wright, P.; Roux, O.; LaPierre, L.M. |
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Title |
The hunter becomes the hunted: When cleptobiotic insects are captured by their target ants |
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Journal Article |
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2012 |
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Naturwissenschaften |
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99 |
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4 |
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265-273 |
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Ant predation; Cleptobiosis; Flies and Reduviidae; Myrmecophyte; Social wasps; Stingless bees |
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Here we show that trying to rob prey (cleptobiosis) from a highly specialized predatory ant species is risky. To capture prey, Allomerus decemarticulatus workers build gallery-shaped traps on the stems of their associated myrmecophyte, Hirtella physophora. We wondered whether the frequent presence of immobilized prey on the trap attracted flying cleptoparasites. Nine social wasp species nest in the H. physophora foliage; of the six species studied, only Angiopolybia pallens rob prey from Allomerus colonies. For those H. physophora not sheltering wasps, we noted cleptobiosis by stingless bees (Trigona), social wasps (A. pallens and five Agelaia species), assassin bugs (Reduviidae), and flies. A relationship between the size of the robbers and their rate of capture by ambushing Allomerus workers was established for social wasps; small wasps were easily captured, while the largest never were. Reduviids, which are slow to extract their rostrum from prey, were always captured, while Trigona and flies often escaped. The balance sheet for the ants was positive vis-à-vis the reduviids and four out of the six social wasp species. For the latter, wasps began by cutting up parts of the prey's abdomen and were captured (or abandoned the prey) before the entire abdomen was retrieved so that the total weight of the captured wasps exceeded that of the prey abdomens. For A. pallens, we show that the number of individuals captured during attempts at cleptobiosis increases with the size of the Allomerus' prey. © Springer-Verlag 2012. |
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Department of Biology, Lower Columbia College, 1600 Maple St., Longview, WA 98632, United States |
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Cited By (since 1996): 1; Export Date: 16 January 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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458 |
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Lenoir, A.; Devers, S.; Touchard, A.; Dejean, A. |
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The Guianese population of the fire ant Solenopsis saevissima is unicolonial |
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Journal Article |
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2016 |
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Insect Science |
Abbreviated Journal |
Insect Science |
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23 |
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5 |
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739-745 |
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biological invasions; cuticular hydrocarbons; fire ants; unicoloniality |
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In this study, conducted in French Guiana, a part of the native range of the fire ant Solenopsis saevissima, we compared the cuticular hydrocarbon profiles of media workers with previous results based on intraspecific aggressiveness tests. We noted a strong congruence between the two studies permitting us to delimit 2 supercolonies extending over large distances (up to 54 km), a phenomenon known as unicoloniality. Solenopsis geminata workers, taken as an out-group for cluster analyses, have a very different cuticular hydrocarbon profile. Because S. saevissima has been reported outside its native range, our conclusion is that this species has the potential to become invasive because unicoloniality (i.e., the main attribute for ants to become invasive) was shown at least for the Guianese population. © 2015 Institute of Zoology, Chinese Academy of Sciences |
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CNRS, Ecolab (UMR-CNRS 5245), Toulouse, France |
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Export Date: 3 October 2016 |
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EcoFoG @ webmaster @ |
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696 |
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Coutand, C.; Fournier, M.; Moulia, B. |
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The gravitropic response of poplar trunks: Key roles of prestressed wood regulation and the relative kinetics of cambial growth versus wood maturation |
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Journal Article |
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2007 |
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Plant Physiology |
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Plant Physiol. |
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144 |
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2 |
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1166-1180 |
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In tree trunks, the motor of gravitropism involves radial growth and differentiation of reaction wood (Archer, 1986). The first aim of this study was to quantify the kinematics of gravitropic response in young poplar (Populus nigra x Populus deltoides, 'I4551') by measuring the kinematics of curvature fields along trunks. Three phases were identified, including latency, upward curving, and an anticipative autotropic decurving, which has been overlooked in research on trees. The biological and mechanical bases of these processes were investigated by assessing the biomechanical model of Fournier et al. (1994). Its application at two different time spans of integration made it possible to test hypotheses on maturation, separating the effects of radial growth and cross section size from those of wood prestressing. A significant correlation between trunk curvature and Fournier's model integrated over the growing season was found, but only explained 32% of the total variance. Moreover, over a week's time period, the model failed due to a clear out phasing of the kinetics of radial growth and curvature that the model does not take into account. This demonstrates a key role of the relative kinetics of radial growth and the maturation process during gravitropism. Moreover, the degree of maturation strains appears to differ in the tension woods produced during the upward curving and decurving phases. Cell wall maturation seems to be regulated to achieve control over the degree of prestressing of tension wood, providing effective control of trunk shape. |
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Univ Clermont Ferrand, Inst Natl Recherche Agronom, Physiol Integree Arbre Fruitier, Unite Mixte Recherche 547, F-63100 Clermont Ferrand, France, Email: coutand@clermont.inra.fr |
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AMER SOC PLANT BIOLOGISTS |
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0032-0889 |
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ISI:000247075000055 |
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EcoFoG @ eric.marcon @ |
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162 |
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Díaz, S.; Kattge, J.; Cornelissen, J.H.C.; Wright, I.J.; Lavorel, S.; Dray, S.; Reu, B.; Kleyer, M.; Wirth, C.; Colin Prentice, I.; Garnier, E.; Bönisch, G.; Westoby, M.; Poorter, H.; Reich, P.B.; Moles, A.T.; Dickie, J.; Gillison, A.N.; Zanne, A.E.; Chave, J.; Joseph Wright, S.; Sheremet’ev, S.N.; Jactel, H.; Baraloto, C.; Cerabolini, B.; Pierce, S.; Shipley, B.; Kirkup, D.; Casanoves, F.; Joswig, J.S.; Günther, A.; Falczuk, V.; Rüger, N.; Mahecha, M.D.; Gorné, L.D. |
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Title |
The global spectrum of plant form and function |
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Journal Article |
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2016 |
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Nature |
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Nature |
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529 |
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7585 |
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167-171 |
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Earth is home to a remarkable diversity of plant forms and life histories, yet comparatively few essential trait combinations have proved evolutionarily viable in today’s terrestrial biosphere. By analysing worldwide variation in six major traits critical to growth, survival and reproduction within the largest sample of vascular plant species ever compiled, we found that occupancy of six-dimensional trait space is strongly concentrated, indicating coordination and trade-offs. Three-quarters of trait variation is captured in a two-dimensional global spectrum of plant form and function. One major dimension within this plane reflects the size of whole plants and their parts; the other represents the leaf economics spectrum, which balances leaf construction costs against growth potential. The global plant trait spectrum provides a backdrop for elucidating constraints on evolution, for functionally qualifying species and ecosystems, and for improving models that predict future vegetation based on continuous variation in plant form and function. |
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Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. |
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0028-0836 |
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EcoFoG @ webmaster @ |
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654 |
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Croft, H.; Chen, J.M.; Wang, R.; Mo, G.; Luo, S.; Luo, X.; He, L.; Gonsamo, A.; Arabian, J.; Zhang, Y.; Simic-Milas, A.; Noland, T.L.; He, Y.; Homolová, L.; Malenovský, Z.; Yi, Q.; Beringer, J.; Amiri, R.; Hutley, L.; Arellano, P.; Stahl, C.; Bonal, D. |
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The global distribution of leaf chlorophyll content |
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Journal Article |
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2020 |
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Remote Sensing of Environment |
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Remote Sens. Environ. |
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236 |
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111479 |
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Leaf chlorophyll is central to the exchange of carbon, water and energy between the biosphere and the atmosphere, and to the functioning of terrestrial ecosystems. This paper presents the first spatially-continuous view of terrestrial leaf chlorophyll content (ChlLeaf) at the global scale. Weekly maps of ChlLeaf were produced from ENVISAT MERIS full resolution (300 m) satellite data using a two-stage physically-based radiative transfer modelling approach. Firstly, leaf-level reflectance was derived from top-of-canopy satellite reflectance observations using 4-Scale and SAIL canopy radiative transfer models for woody and non-woody vegetation, respectively. Secondly, the modelled leaf-level reflectance was input into the PROSPECT leaf-level radiative transfer model to derive ChlLeaf. The ChlLeaf retrieval algorithm was validated using measured ChlLeaf data from 248 sample measurements at 28 field locations, and covering six plant functional types (PFTs). Modelled results show strong relationships with field measurements, particularly for deciduous broadleaf forests (R2 = 0.67; RMSE = 9.25 microg cm-2; p < 0.001), croplands (R2 = 0.41; RMSE = 13.18 microg cm-2; p < 0.001) and evergreen needleleaf forests (R2 = 0.47; RMSE = 10.63 microg cm-2; p < 0.001). When the modelled results from all PFTs were considered together, the overall relationship with measured ChlLeaf remained good (R2 = 0.47, RMSE = 10.79 microg cm-2; p < 0.001). This result is an improvement on the relationship between measured ChlLeaf and a commonly used chlorophyll-sensitive spectral vegetation index; the MERIS Terrestrial Chlorophyll Index (MTCI; R2 = 0.27, p < 0.001). The global maps show large temporal and spatial variability in ChlLeaf, with evergreen broadleaf forests presenting the highest leaf chlorophyll values, with global annual median values of 54.4 microg cm-2. Distinct seasonal ChlLeaf phenologies are also visible, particularly in deciduous plant forms, associated with budburst and crop growth, and leaf senescence. It is anticipated that this global ChlLeaf product will make an important step towards the explicit consideration of leaf-level biochemistry in terrestrial water, energy and carbon cycle modelling. |
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UMR EEF, INRA Université de Lorraine, Champenoux54280, France |
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Elsevier Inc. |
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00344257 (Issn) |
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EcoFoG @ webmaster @ |
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898 |
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Gruhn, G.; Dumez, S.; Moreau, P.-A.; Roy, M.; Morreale, O.; Schimann, H.; Courtecuisse, R.. |
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The genus Resinicium in French Guiana and the West Indies: a morphological and molecular survey, revealing Resinicium grandisporum sp. nov. |
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2017 |
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Cryptogamie, Mycologie |
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38 |
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4 |
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1-15 |
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A revision of Resinicium collections (Basidiomycota, Hymenochaetales) from French Guiana and French West Indies is provided, and a new species, Resinicium grandisporum sp. nov., supported by morphological as well as phylogenetic analyses based on ITS DNA sequences, is described and illustrated. An updated key of the genus Resinicium is also provided, which includes species previously described from outside of the studied area. |
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EcoFoG @ webmaster @ |
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779 |
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Zalamea, P.-C.; Heuret, P.; Sarmiento, C.; Rodríguez, M.; Berthouly, A.; Guitet, S.; Nicolini, E.; Delnatte, C.; Barthélémy, D.; Stevenson, P.R. |
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The genus Cecropia: A biological clock to estimate the age of recently disturbed areas in the neotropics |
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2012 |
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PLoS ONE |
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PLoS ONE |
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7 |
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8 |
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e42643 |
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Forest successional processes following disturbance take decades to play out, even in tropical forests. Nonetheless, records of vegetation change in this ecosystem are scarce, increasing the importance of the chronosequence approach to study forest recovery. However, this approach requires accurate dating of secondary forests, which until now was a difficult and/or expensive task. Cecropia is a widespread and abundant pioneer tree genus of the Neotropics. Here we propose and validate a rapid and straightforward method to estimate the age of secondary forest patches based on morphological observations of Cecropia trees. We found that Cecropia-inferred ages were highly correlated with known ages of the forest. We also demonstrate that Cecropia can be used to accurately date disturbances and propose twenty-one species distributed all over the geographical range of the genus as potential secondary forest chronometer species. Our method is limited in applicability by the maximal longevity of Cecropia individuals. Although the oldest chronosequence used in this study was 20 years old, we argue that at least for the first four decades after disturbance, the method described in this study provides very accurate estimations of secondary forest ages. The age of pioneer trees provides not only information needed to calculate the recovery of carbon stocks that would help to improve forest management, but also provides information needed to characterize the initial floristic composition and the rates of species remigration into secondary forest. Our contribution shows how successional studies can be reliably and inexpensively extended without the need to obtain forest ages based on expensive or potentially inaccurate data across the Neotropics. © 2012 Zalamea et al. |
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Smithsonian Tropical Research Institute, Ancón, Panama |
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19326203 (Issn) |
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Export Date: 29 August 2012; Source: Scopus; Art. No.: e42643; doi: 10.1371/journal.pone.0042643; Language of Original Document: English; Correspondence Address: Zalamea, P.-C.; Smithsonian Tropical Research Institute, Ancón, Panama; email: camilozalamea@gmail.com |
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424 |
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Delph, L.F.; Arntz, A.M.; Scotti-Saintagne, C.; Scotti, I. |
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The Genomic Architecture of Sexual Dimorphism in the Dioecious Plant Silene Latifolia |
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Journal Article |
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2010 |
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Evolution |
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Evolution |
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64 |
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10 |
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2873-2886 |
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Artificial selection; genetic correlations; linkage map; sex-specific expression; sexual conflict |
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Evaluating the genetic architecture of sexual dimorphism can aid our understanding of the extent to which shared genetic control of trait variation versus sex-specific control impacts the evolutionary dynamics of phenotypic change within each sex. We performed a QTL analysis on Silene latifolia to evaluate the contribution of sex-specific QTL to phenotypic variation in 46 traits, whether traits involved in trade-offs had colocalized QTL, and whether the distribution of sex-specific loci can explain differences between the sexes in their variance/covariance matrices. We used a backcross generation derived from two artificial-selection lines. We found that sex-specific QTL explained a significantly greater percent of the variation in sexually dimorphic traits than loci expressed in both sexes. Genetically correlated traits often had colocalized QTL, whose signs were in the expected direction. Lastly, traits with different genetic correlations within the sexes displayed a disproportionately high number of sex-specific QTL, and more QTL co-occurred in males than females, suggesting greater trait integration. These results show that sex differences in QTL patterns are congruent with theory on the resolution of sexual conflict and differences based on G-matrix results. They also suggest that trade-offs and trait integration are likely to affect males more than females. |
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[Delph, Lynda F.; Arntz, A. Michele; Scotti, Ivan] Indiana Univ, Dept Biol, Bloomington, IN 47405 USA, Email: ldelph@indiana.edu |
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WILEY-BLACKWELL PUBLISHING, INC |
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0014-3820 |
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ISI:000282573800006 |
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EcoFoG @ eric.marcon @ |
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31 |
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Almeras, T.; Yoshida, M.; Okuyama, T. |
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The generation of longitudinal maturation stress in wood is not dependent on diurnal changes in diameter of trunk |
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Journal Article |
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2006 |
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Journal of Wood Science |
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J. Wood Sci. |
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52 |
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5 |
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452-455 |
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maturation stress; growth stress; cell-wall maturation; continuous lighting; diurnal strains |
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A hypothetical mechanism for the generation of maturation stress in wood was tested experimentally. The hypothesis was that the maturation stress could partly originate in a physical mechanism related to daily changes in water pressure and associated diurnal strains. The matrix of lignin and hemicellulose, deposited in the cell wall during the night, would be put in compression by the effect of water tension during the next day. The cellulose framework, crystallizing during the day, would be put in tension by the decrease in tension at night and subsequent cell-wall swelling. This was tested on young saplings of sugi and beech. Half of the saplings were submitted to continuous lighting, which canceled diurnal strains. Saplings were tilted 40 degrees, and their uprighting movement was measured. The uprighting movement is directly due to the production of reaction wood and the concomitant development of large longitudinal maturation stress. It occurred in the continuously lighted plants at least as much as in control plants. We conclude that the generation of longitudinal maturation stress in tension or compression wood is not directly related to variations in water pressure and diurnal strains. |
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Nagoya Univ, Grad Sch Bioagr Sci, Lab Biomat Phys, Chikusa Ku, Nagoya, Aichi 4648601, Japan, Email: t_almeras@hotmail.com |
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Publisher |
SPRINGER TOKYO |
Place of Publication |
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Editor |
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Language |
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Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1435-0211 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
ISI:000241010600012 |
Approved |
no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
222 |
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