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Author |
Dejean, A.; Grangier, J.; Leroy, C.; Orivel, J. |
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Title |
Host plant protection by arboreal ants: looking for a pattern in locally induced responses |
Type |
Journal Article |
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Year |
2008 |
Publication |
Evolutionary Ecology Research |
Abbreviated Journal  |
Evol. Ecol. Res. |
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Volume |
10 |
Issue |
8 |
Pages |
1217-1223 |
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Keywords |
aggressiveness; ant-plant relationships; Azteca; biotic defence; induced responses |
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Abstract |
Background: Among arboreal ants, both territorially dominant species and plant-ants (e.g. species associated with myrmecophytes or plants housing them in hollow structures) protect their host trees against defoliators. Yet, locally induced responses, or the recruitment of nest-mates when a worker discovers it wound on its host-tree, were only noted in plant-ants. We wondered whether this might be due to the examination of the phenomenon being restricted to only six plant-ant species belonging to four genera. Based on the ant genus Azteca, a Neotropical group of arboreal species, we compared five species. The territorially dominant, carton-nester A. chartifex, three plant-ant species [A. alfari and A. ovaticeps associated with myrmecophitic Cecropia (Cecropiaceae), and A. bequaerti associated with Tococa guianensis (Melastomataceae)], and A. schimperi thought to be a temporary social parasite of true Cecropia ants. Methods: We artificially inflicted wounds to the foliage of the host tree of the different ant species. We then compared the number of workers on wounded versus control leaves. Results: We noted a locally induced response in the three plant-ant species as well as in the territorially dominant species, but very slightly so in A. schimperi. |
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[Grangier, Julien; Orivel, Jerome] Univ Toulouse 2, Lab Evolut & Diversite Biol, CNRS, UMR 5174, Toulouse, France, Email: alain.dejean@wanadoo.fr |
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EVOLUTIONARY ECOLOGY LTD |
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1522-0613 |
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ISI:000264041000008 |
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EcoFoG @ eric.marcon @ |
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119 |
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Delph, L.F.; Arntz, A.M.; Scotti-Saintagne, C.; Scotti, I. |
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Title |
The Genomic Architecture of Sexual Dimorphism in the Dioecious Plant Silene Latifolia |
Type |
Journal Article |
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Year |
2010 |
Publication |
Evolution |
Abbreviated Journal |
Evolution |
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Volume |
64 |
Issue |
10 |
Pages |
2873-2886 |
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Keywords |
Artificial selection; genetic correlations; linkage map; sex-specific expression; sexual conflict |
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Abstract |
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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Author |
Vendramin, G.G.; Fady, B.; Gonzalez-Martinez, S.C.; Hu, F.S.; Scotti, I.; Sebastiani, F.; Soto, A.; Petit, R.J. |
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Title |
Genetically depauperate but widespread: The case of an emblematic mediterranean pine |
Type |
Journal Article |
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Year |
2008 |
Publication |
Evolution |
Abbreviated Journal |
Evolution |
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Volume |
62 |
Issue |
3 |
Pages |
680-688 |
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Keywords |
chloroplast microsatellites; conservation genetics; diversity depletion; human impact; Pinus pinea |
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Abstract |
Genetic variation is generally considered a prerequisite for adaptation to new environmental conditions. Thus the discovery of genetically depauperate but geographically widespread species is unexpected. We used 12 paternally inherited chloroplast microsatellites to estimate population genetic variation across the full range of an emblematic circum-Mediterranean conifer, stone pine (Pinus pinea L.). The same chloroplast DNA haplotype is fixed in nearly all of the 34 investigated populations. Such a low level of variation is consistent with a previous report of very low levels of diversity at nuclear loci in this species. Stone pine appears to have passed through a severe and prolonged demographic bottleneck, followed by subsequent natural- and human-mediated dispersal across the Mediterranean Basin. No other abundant and widespread plant species has as little genetic diversity as P. pinea at both chloroplast and nuclear markers. However, the species harbors a nonnegligible amount of variation at adaptive traits. Thus a causal relationship between genetic diversity, as measured by marker loci, and the evolutionary precariousness of a species, cannot be taken for granted. |
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[Vendramin, Giovanni G.] Ist Genet Vegetale, Sez Firenze, Florence, Italy, Email: petit@pierroton.inra.fr |
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BLACKWELL PUBLISHING |
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0014-3820 |
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Notes |
ISI:000253758600016 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
141 |
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Author |
Scotti, I.; Delph, L.F. |
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Title |
Selective trade-offs and sex-chromosome evolution in Silene latifolia |
Type |
Journal Article |
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Year |
2006 |
Publication |
Evolution |
Abbreviated Journal |
Evolution |
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Volume |
60 |
Issue |
9 |
Pages |
1793-1800 |
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Keywords |
antagonistic genes; linkage map; quantitative trait loci; sex-specific expression; Y chromosome |
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Abstract |
Alleles of sexually antagonistic genes (i.e., genes with alleles affecting fitness in opposite directions in the two sexes) can avoid expression in the sex to which they are detrimental via two processes: they are subsumed into the nonrecombining, sex-determining portion of the sex chromosomes or they evolve sex-limited expression. The former is considered more likely and leads to Y-chromosome degeneration. We mapped quantitative trait loci of major effect for sexually dimorphic traits of Silene latifolia to the recombining portions of the sex chromosomes and found them to exhibit sex-specific expression, with the Y chromosome in males controlling a relatively larger proportion of genetic variance than the X in females and the average autosome. Both reproductive and ecophysiological traits map to the recombining region of the sex chromosomes. We argue that genetic correlations among traits maintain recombination and polymorphism for these genes because of balancing selection in males, whereas sex-limited expression represses detrimental alleles in females. Our data suggest that the Y chromosome of S. latifolia plays a major role in the control of key metabolic activities beyond reproductive functions. |
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Indiana Univ, Dept Biol, Bloomington, IN 47405 USA, Email: ivan.scotti@kourou.cirad.fr |
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SOC STUDY EVOLUTION |
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0014-3820 |
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Notes |
ISI:000241226800005 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
174 |
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Author |
Dutech, C.; Maggia, L.; Tardy, C.; Joly, H.I.; Jarne, P. |
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Title |
Tracking a genetic signal of extinction-recolonization events in a neotropical tree species: Vouacapoua americana aublet in french guiana |
Type |
Journal Article |
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Year |
2003 |
Publication |
Evolution |
Abbreviated Journal |
Evolution |
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Volume |
57 |
Issue |
12 |
Pages |
2753-2764 |
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Keywords |
allelic richness; caesalpinioideae; chloroplast DNA; climatic changes; cytonuclear disequilibrium; legummosae; microsatellite loci; tropical rainforest |
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Drier periods from the late Pleistocene and early Holocene have been hypothesized to have caused the disappearance of various rainforest species over large geographical areas in South America and restricted the extant populations to mesic sites. Subsequent improvement in climatic conditions has been associated with recolonization. Changes in population size associated with these extinction-recolonization events should have affected genetic diversity within species. However, these historical hypotheses and their genetic consequences have rarely been tested in South America. Here, we examine the diversity of the chloroplast and nuclear genomes in a Neotropical rainforest tree species, Vouacapoua americana (Leguminosae, Caesalpinioideae) in French Guiana. The chloroplast diversity was analyzed using a polymerase chain reaction-restriction fragment length polymorphism method (six pairs of primers) in 29 populations distributed over most of French Guiana, and a subset of 17 populations was also analyzed at nine polymorphic microsatellite loci. To determine whether this species has experienced extinction-recolonization, we sampled populations in areas supposedly not or only slightly affected by climatic changes, where the populations would not have experienced frequent extinction, and in areas that appear to have been recently recolonized. In the putatively recolonized areas, we found patches of several thousands of hectares homogeneous for chloroplast variation that can be interpreted as the effect of recolonization processes from several geographical origins. In addition, we observed that, for both chloroplast and nuclear genomes, the populations in newly recolonized areas exhibited a significantly smaller allelic richness than others. Controlling for geographic distance, we also detected a significant correlation between chloroplast and nuclear population differentiation. This result indicates a cytonuclear disequilibrium that can be interpreted as a historical signal of a genetic divergence between fragmented populations. In conclusion, the spatial genetic structure of contemporary V. americana populations shows evidence that this species has experienced large extinction-recolonization events, which were possibly caused by past climatic change. |
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CIRAD Foret, Silvolab, Ecol Mol, F-97387 Kourou, France, Email: laruent.maggia@cirad.fr |
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SOC STUDY EVOLUTION |
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0014-3820 |
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ISI:000188061800007 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
241 |
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Author |
Chartier, M.; Gibernau, M.; Renner, S.S. |
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Title |
The evolution of pollinator-plant interaction types in the araceae |
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Journal Article |
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Year |
2014 |
Publication |
Evolution |
Abbreviated Journal |
Evolution |
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Volume |
68 |
Issue |
5 |
Pages |
1533-1543 |
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Keywords |
Ancestral state reconstruction; Inflorescence traits; Phylogeny; Pollination syndromes; Trap flowers |
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Abstract |
Most plant-pollinator interactions are mutualistic, involving rewards provided by flowers or inflorescences to pollinators. Antagonistic plant-pollinator interactions, in which flowers offer no rewards, are rare and concentrated in a few families including Araceae. In the latter, they involve trapping of pollinators, which are released loaded with pollen but unrewarded. To understand the evolution of such systems, we compiled data on the pollinators and types of interactions, and coded 21 characters, including interaction type, pollinator order, and 19 floral traits. A phylogenetic framework comes from a matrix of plastid and new nuclear DNA sequences for 135 species from 119 genera (5342 nucleotides). The ancestral pollination interaction in Araceae was reconstructed as probably rewarding albeit with low confidence because information is available for only 56 of the 120-130 genera. Bayesian stochastic trait mapping showed that spadix zonation, presence of an appendix, and flower sexuality were correlated with pollination interaction type. In the Araceae, having unisexual flowers appears to have provided the morphological precondition for the evolution of traps. Compared with the frequency of shifts between deceptive and rewarding pollination systems in orchids, our results indicate less lability in the Araceae, probably because of morphologically and sexually more specialized inflorescences. © 2013 The Society for the Study of Evolution. |
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Department of Biology, University of Munich, Munich, 80638, Germany |
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Society for the Study of Evolution |
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15585646 (Issn) |
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Export Date: 30 May 2014; Source: Scopus; Coden: Evola; Language of Original Document: English |
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EcoFoG @ webmaster @ |
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544 |
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Young, E.F.; Belchier, M.; Hauser, L.; Horsburgh, G.J.; Meredith, M.P.; Murphy, E.J.; Pascoal, S.; Rock, J.; Tysklind, N.; Carvalho, G.R. |
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Title |
Oceanography and life history predict contrasting genetic population structure in two Antarctic fish species |
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Journal Article |
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Year |
2015 |
Publication |
Evolutionary Applications |
Abbreviated Journal |
Evolutionary Applications |
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Volume |
8 |
Issue |
5 |
Pages |
486-509 |
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Keywords |
Notothenia rossii; Champsocephalus gunnari; Connectivity; Individual-based Modelling; Ocean circulation; Planktonic dispersal; Population genetics; Scotia Sea |
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Understanding the key drivers of population connectivity in the marine environment is essential for the effective management of natural resources. Although several different approaches to evaluating connectivity have been used, they are rarely integrated quantitatively. Here, we use a 'seascape genetics' approach, by combining oceanographic modelling and microsatellite analyses, to understand the dominant influences on the population genetic structure of two Antarctic fishes with contrasting life histories, Champsocephalus gunnari and Notothenia rossii. The close accord between the model projections and empirical genetic structure demonstrated that passive dispersal during the planktonic early life stages is the dominant influence on patterns and extent of genetic structuring in both species. The shorter planktonic phase of C. gunnari restricts direct transport of larvae between distant populations, leading to stronger regional differentiation. By contrast, geographic distance did not affect differentiation in N. rossii, whose longer larval period promotes long-distance dispersal. Interannual variability in oceanographic flows strongly influenced the projected genetic structure, suggesting that shifts in circulation patterns due to climate change are likely to impact future genetic connectivity and opportunities for local adaptation, resilience and recovery from perturbations. Further development of realistic climate models is required to fully assess such potential impacts. © 2015 The Authors. |
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Campus Agronomique, Kourou Cedex, France |
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Export Date: 28 May 2015 |
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EcoFoG @ webmaster @ |
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604 |
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Bertani, S.; Houel, E.; Jullian, V.; Bourdy, G.; Valentin, A.; Stien, D.; Deharo, E. |
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Title |
New findings on Simalikalactone D, an antimalarial compound from Quassia amara L. (Simaroubaceae) |
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Journal Article |
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Year |
2012 |
Publication |
Experimental Parasitology |
Abbreviated Journal |
Exp. Parasitol. |
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Volume |
130 |
Issue |
4 |
Pages |
341-347 |
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Antimalarial; Plasmodium; Quassia amara; Quassinoid; Simalikalactone d |
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Quassia amara L. (Simaroubaceae) is a species widely used as tonic and is claimed to be an efficient antimalarial all over the Northern part of the Amazon basin. Quassinoid compound Simalikalactone D (SkD) has been shown to be one of the molecules responsible for the antiplasmodial activity of a watery preparation made out of juvenile fresh leaves of this plant. Because of its strong antimalarial activity, we decided to have a further insight of SkD pharmacological properties, alone or in association with classical antimalarials. At concentrations of up to 200 μM, we showed herein that SkD did not exert any apoptotic or necrotic activities in vitro on lymphoblastic cells. However, an antiproliferative effect was evident at concentrations higher than 45. nM. SkD was inefficient at inhibiting heme biomineralization and the new permeability pathways induced by the parasite in the host erythrocyte membrane. With respect to Plasmodium falciparum erythrocytic stages, SkD was almost inactive on earlier and later parasite stages, but potently active at the 30th h of parasite cycle when DNA replicates in mature trophozoites. In vitro combination studies with conventional antimalarial drugs showed that SkD synergizes with atovaquone (ATO). The activity of ATO on the Plasmodium mitochondrial membrane potential was enhanced by SkD, which on its own had a poor effect on this cellular parameter. © 2012 Elsevier Inc. |
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UMR152 IRD-UPS, Institut de Recherche pour le Développement (IRD), Universidad Peruana Cayetano Heredia (UPCH), Lima, Peru |
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00144894 (Issn) |
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Export Date: 24 April 2012; Source: Scopus; Coden: Expaa; doi: 10.1016/j.exppara.2012.02.013; Language of Original Document: English; Correspondence Address: Deharo, E.; UMR152 IRD-UPS, Faculté de Pharmacie, 35 chemin des maraîchers, 31062 Toulouse cedex 9, France; email: ericdeharo@gmail.com |
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EcoFoG @ webmaster @ |
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395 |
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Carrias, J.-F.; Gerphagnon, M.; Rodríguez-Pérez, H.; Borrel, G.; Loiseau, C.; Corbara, B.; Céréghino, R.; Mary, I.; Leroy, C. |
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Title |
Resource availability drives bacterial succession during leaf-litter decomposition in a bromeliad ecosystem |
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Journal Article |
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Year |
2020 |
Publication |
FEMS microbiology ecology |
Abbreviated Journal |
FEMS Microbiol. Ecol. |
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Volume |
96 |
Issue |
4 |
Pages |
fiaa045 |
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16S rRNA gene; amplicon sequencing; bacterial diversity; community ecology; decomposition; ecological succession |
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Despite the growing number of investigations on microbial succession during the last decade, most of our knowledge on primary succession of bacteria in natural environments comes from conceptual models and/or studies of chronosequences. Successional patterns of litter-degrading bacteria remain poorly documented, especially in undisturbed environments. Here we conducted an experiment with tank bromeliads as natural freshwater microcosms to assess major trends in bacterial succession on two leaf-litter species incubated with or without animal exclusion. We used amplicon sequencing and a co-occurrence network to assess changes in bacterial community structure according to treatments. Alpha-diversity and community complexity displayed the same trends regardless of the treatments, highlighting that primary succession of detrital-bacteria is subject to resource limitation and biological interactions, much like macro-organisms. Shifts in bacterial assemblages along the succession were characterized by an increase in uncharacterized taxa and potential N-fixing bacteria, the latter being involved in positive co-occurrence between taxa. These findings support the hypothesis of interdependence between taxa as a significant niche-based process shaping bacterial communities during the advanced stage of succession. © FEMS 2020. |
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AMAP, IRD, CIRAD, CNRS, INRA, Université Montpellier, Montpellier, France |
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NLM (Medline) |
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15746941 (Issn) |
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Export Date: 14 April 2020 |
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EcoFoG @ webmaster @ |
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926 |
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Author |
Delabie, J.H.C.; Groc, S.; Dejean, A. |
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The tramp ant technomyrmex vitiensis (Hymenoptera: Formicidae: Dolichoderinae) on South America |
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Journal Article |
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Year |
2011 |
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Florida Entomologist |
Abbreviated Journal |
Fla. Entomol. |
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Volume |
94 |
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3 |
Pages |
688-689 |
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Abstract |
Technomyrmex vitiensis is a tramp ant that has spread through many parts of the Old World tropics via human commerce. This species has been previously reported only once in the New World, from San Francisco, California. Here, we report the first records of T. vitiensis in South America, from two sites deep in the forest of French Guiana. It is not clear how these ants were transported to such remote sites, 100 km inland. Copyright © 2011 BioOne All rights reserved. |
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Université de Toulouse, UPS, 118 route de Narbonne, F-31062 Toulouse, France |
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Export Date: 26 October 2011; Source: Scopus; Coden: Fetma; doi: 10.1653/024.094.0335; Language of Original Document: English; Correspondence Address: Delabie, J.H.C.; Universidade Estadual de Santa Cruz, Rodovia Ilhéus-Itabuna, Km 16, 45650-000 Ilhéus, Bahia, Brazil |
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