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Talaga, S.; Petitclerc, F.; Carrias, J.-F.; Dezerald, O.; Leroy, C.; Céréghino, R.; Dejean, A. |
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Title |
Environmental drivers of community diversity in a neotropical urban landscape: a multi-scale analysis |
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Journal Article |
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2017 |
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Landscape Ecology |
Abbreviated Journal |
Landscape Ecology |
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32 |
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9 |
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1805-1818 |
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Aquatic metacommunity; Landscape ecology; Mosquitoes; Neotropics; Scale dependency; Tank bromeliads; Urban ecology |
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Context: Many aquatic communities are linked by the aerial dispersal of multiple, interacting species and are thus structured by processes occurring in both the aquatic and terrestrial compartments of the ecosystem. Objectives: To evaluate the environmental factors shaping the aquatic macroinvertebrate communities associated with tank bromeliads in an urban landscape. Methods: Thirty-two bromeliads were georeferenced to assess the spatial distribution of the aquatic meta-habitat in one city. The relative influence of the aquatic and terrestrial habitats on the structure of macroinvertebrate communities was analyzed at four spatial scales (radius = 10, 30, 50, and 70 m) using redundancy analyses. Results: We sorted 18,352 aquatic macroinvertebrates into 29 taxa. Water volume and the amount of organic matter explained a significant part of the taxa variance, regardless of spatial scale. The remaining variance was explained by the meta-habitat size (i.e., the water volume for all of the bromeliads within a given surface area), the distance to the nearest building at small scales, and the surface area of buildings plus ground cover at larger scales. At small scales, the meta-habitat size influenced the two most frequent mosquito species in opposite ways, suggesting spatial competition and coexistence. Greater vegetation cover favored the presence of a top predator. Conclusions: The size of the meta-habitat and urban landscape characteristics influence the structure of aquatic communities in tank bromeliads, including mosquito larval abundance. Modifications to this landscape will affect both the terrestrial and aquatic compartments of the urban ecosystem, offering prospects for mosquito management during urban planning. © 2017, Springer Science+Business Media B.V. |
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IRD; UMR AMAP (botAnique et Modélisation de l’Architecture des Plantes et des végétations), Boulevard de la Lironde, TA A‐51/PS2, Montpellier Cedex 5, France |
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Export Date: 18 December 2017 |
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EcoFoG @ webmaster @ |
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777 |
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Seymour, R.S.; Gibernau, M.; Pirintsos, S.A. |
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Title |
Thermogenesis of three species of Arum from Crete |
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Journal Article |
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Year |
2009 |
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Plant Cell and Environment |
Abbreviated Journal |
Plant Cell Environ. |
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32 |
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10 |
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1467-1476 |
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Araceae; arum lily; inflorescence; pollination; temperature regulation |
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Inflorescences of arum lilies have a three-part spadix with a scent-producing, sterile appendix above two bands of fertile male and female florets. The appendix and male florets are thermogenic, but with different temporal patterns. Heat-production was measured in Arum concinnatum, A. creticum and A. idaeum. The male florets of A. concinnatum showed a 3 d continuous episode of thermogenesis with three waves, and the appendix warmed in a single, 6 h episode. Maximum fresh-mass-specific CO2 production rate was 0.17 μmol s(-1) g(-1) to achieve a 10.9 degrees C temperature elevation by the appendix, and 0.92 μmol s(-1) g(-1) to achieve a 4.8 degrees C elevation by male florets. Reversible, physiological temperature regulation was not evident in either tissue. Respiration increased with tissue temperatures with Q(10) values of 1.8-3.9, rather than less than 1.0 as occurs in thermoregulatory flowers. Experimental step changes in temperature of appendix and male floret tissues also failed to show thermoregulatory responses. The patterns of thermogenesis therefore appear to be fixed by the temporal sequence of blooming. Thermogenesis in the alpine species, A. creticum and A. idaeum, was significantly lower than in the lowland A. concinnatum, possibly related to difficulty in raising floral temperature in their cold and windy habitat. |
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[Seymour, Roger S.] Univ Adelaide, Adelaide, SA 5005, Australia, Email: roger.seymour@adelaide.edu.au |
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WILEY-BLACKWELL PUBLISHING, INC |
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0140-7791 |
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ISI:000269592300016 |
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EcoFoG @ eric.marcon @ |
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195 |
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Coté, G.G.; Gibernau, M. |
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Title |
Distribution of calcium oxalate crystals in floral organs of araceae in relation to pollination strategy |
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Journal Article |
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Year |
2012 |
Publication |
American Journal of Botany |
Abbreviated Journal |
Am. J. Bot. |
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99 |
Issue |
7 |
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1231-1242 |
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Araceae; Beetles; Calcium oxalate; Crystal; Defense; Flowers; Herbivory; Pollination |
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Premise of the study: Many flowers are pollinated by potentially hungry insects, yet flowers also contain gametes and embryos which must be protected from predation. Microscopic calcium oxalate crystals in plant tissues have been proposed to protect against herbivory. Aroids, which have an unusual diversity of such crystals, also exhibit diverse pollination strategies. Many species have pollinators that do not feed while visiting the flowers, while other species, especially those pollinated by beetles, offer sterile staminodia as food rewards. We examined flowers of 21 aroid species with various pollination strategies to test the hypothesis that crystals protect vital gametes and embryos while allowing consumption of food bribes.Methods: Aroid inflorescences collected from the field or from greenhouse material were sectioned, cleared, and examined by bright field and polarization microscopy.Key results: All species examined, regardless of pollination strategy, arrayed crystals around unshed pollen and ovules. Less vital tissues, such as odoriferous appendages, had few crystals. Staminodia offered as food to beetle pollinators, however, differed greatly between species in their crystal contents. Some had minimal crystals; some had crystals in patterns suggesting they limit beetle feeding; still others had abundant crystals in no obvious pattern.Conclusions: The results are consistent with crystals protecting against insect predation of gametes and embryos. However, the role of crystals in food-bribe staminodia is unclear. They may limit and direct feeding by beetles in some species, while in others they might have no protective role. © 2012 Botanical Society of America. |
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CNRS-Ecolog (UMR 8172), Campus Agronomique BP316, Korou cedex 97379, France |
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00029122 (Issn) |
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Export Date: 10 August 2012; Source: Scopus; Coden: Ajboa; doi: 10.3732/ajb.1100499; Language of Original Document: English; Correspondence Address: Coté, G. G.; Biology Department, Radford University, Radford, VA 24142-6931, United States; email: gcote@radford.edu |
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EcoFoG @ webmaster @ |
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420 |
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Barriault, I.; Barabe, D.; Cloutier, L.; Gibernau, M. |
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Pollination ecology and reproductive success in Jack-in-the-pulpit (Arisaema triphyllum) in Quebec (Canada) |
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Journal Article |
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Year |
2010 |
Publication |
Plant Biology |
Abbreviated Journal |
Plant Biol. |
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12 |
Issue |
1 |
Pages |
161-171 |
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Araceae; bisexual inflorescence; deceptive pollination; Mycetophilidae; pollen load; Thysanoptera; visitation rates |
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Pollination ecology and reproductive success of Jack-in-the-pulpit (Arisaema triphyllum) were studied in two natural populations in Quebec, Canada. Individual A. triphyllum plants can be of three types: male, female or bisexual. In both populations studied, the presence of bisexual inflorescences was not negligible (13%), where 'female' and 'male' bisexual plants were categorised according to the relative number of stamens and ovaries. 'Male bisexual' plants produce only pollen and 'female bisexual' plants produce only fruit. Hence, A. triphyllum is a true dioecious plant, as each plant only reproduces through either the male or the female function. 'Female bisexual' plants were equivalent to female plants in terms of visitation rate by insects, fructification rate and production of berries and seeds. Neither agamospermy in female plants nor self-pollination in 'female bisexual' plants was found, thus A. triphyllum relies on insects for cross-pollination. Despite the long flowering cycle, a low visitation rate was documented: only 20-40% of inflorescences were visited, according to gender, by a mean of 1.5 insects. In this study, Mycetophilidae represented the most generically diversified and abundant family, as well as the most efficient insect pollinator, especially the genera Docosia and Mycetophila. |
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[Gibernau, M.] Univ Toulouse 3, Lab Evolut & Divers Biol, UMR, CNRS, F-31062 Toulouse 9, France, Email: gibernau@cict.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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1435-8603 |
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ISI:000272589700017 |
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EcoFoG @ eric.marcon @ |
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89 |
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Leguet, A.; Gibernau, M.; Shintu, L.; Caldarelli, S.; Moja, S.; Baudino, S.; Caissard, J.-C. |
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Evidence for early intracellular accumulation of volatile compounds during spadix development in Arum italicum L. and preliminary data on some tropical Aroids |
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Journal Article |
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2014 |
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Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
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101 |
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8 |
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623-635 |
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Araceae; Cytochemistry; Gas chromatography; Nuclear magnetic resonance; Volatile compounds |
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Staining and histochemistry of volatile organic compounds (VOCs) were performed at different inflorescence developmental stages on nine aroid species; one temperate, Arum italicum and eight tropical from the genera Caladium, Dieffenbachia and Philodendron. Moreover, a qualitative and quantitative analysis of VOCs constituting the scent of A. italicum, depending on the stage of development of inflorescences was also conducted. In all nine species, vesicles were observed in the conical cells of either the appendix or the stamens (thecae) and the staminodes. VOCs were localised in intracellular vesicles from the early stages of inflorescence development until their release during receptivity of gynoecium. This localisation was observed by the increase of both number and diameter of the vesicles during 1 week before receptivity. Afterwards, vesicles were fewer and smaller but rarely absent. In A. italicum, staining and gas chromatography analyses confirmed that the vesicles contained terpenes. The quantitatively most important ones were the sesquiterpenes, but monoterpenes were not negligible. Indeed, the quantities of terpenes matched the vesicles' size evolution during 1 week. Furthermore, VOCs from different biosynthetic pathways (sesquiterpenes and alkanes) were at their maximum quantity 2 days before gynoecium receptivity (sesquiterpenes and alkanes) or during receptivity (isobutylamine, monoterpenes, skatole and p-cresol). VOCs seemed to be emitted during gynoecium receptivity and/or during thermogenesis, and FADs are accumulated after thermogenesis in the spadix. These complex dynamics of the different VOCs could indicate specialisation of some VOCs and cell machinery to attract pollinators on the one hand and to repulse/protect against phytophagous organisms and pathogens after pollination on the other hand. © 2014 Springer-Verlag Berlin Heidelberg. |
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CNRS, UMR-6134 SPE, 20000 Ajaccio, France |
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Springer Verlag |
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00281042 (Issn) |
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Export Date: 1 September 2014; Coden: Natwa; Correspondence Address: Gibernau, M.; CNRS, UMR-6134 SPE, 20000 Ajaccio, France; email: gibernau@univ-corse.fr |
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EcoFoG @ webmaster @ |
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558 |
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Gibernau, M.; Orivel, J.; Dejean, A.; Delabie, J.; Barabe, D. |
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Flowering as a key factor in ant-Philodendron interactions |
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Journal Article |
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2008 |
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Journal of Tropical Ecology |
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J. Trop. Ecol. |
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24 |
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689-692 |
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Araceae; domatia; habitat; nest site; non-specific association; Philodendron solimoesense; territoriality |
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[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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ISI:000261254400012 |
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EcoFoG @ eric.marcon @ |
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128 |
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Revel, N.; Alvarez, N.; Gibernau, M.; Espíndola, A. |
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Investigating the relationship between pollination strategies and the size-advantage model in zoophilous plants using the reproductive biology of Arum cylindraceum and other European Arum species as case studies |
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Journal Article |
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2012 |
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Arthropod-Plant Interactions |
Abbreviated Journal |
Arthropod-Plant Interact. |
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6 |
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1 |
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35-44 |
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Araceae; Flower evolution; Plant-insect interactions; Reproductive strategy; Sex allocation |
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The size-advantage model (SAM) explains the temporal variation of energetic investment on reproductive structures (i. e. male and female gametes and reproductive organs) in long-lived hermaphroditic plants and animals. It proposes that an increase in the resources available to an organism induces a higher relative investment on the most energetically costly sexual structures. In plants, pollination interactions are known to play an important role in the evolution of floral features. Because the SAM directly concerns flower characters, pollinators are expected to have a strong influence on the application of the model. This hypothesis, however, has never been tested. Here, we investigate whether the identity and diversity of pollinators can be used as a proxy to predict the application of the SAM in exclusive zoophilous plants. We present a new approach to unravel the dynamics of the model and test it on several widespread Arum (Araceae) species. By identifying the species composition, abundance and spatial variation of arthropods trapped in inflorescences, we show that some species (i. e. A. cylindraceum and A. italicum) display a generalist reproductive strategy, relying on the exploitation of a low number of dipterans, in contrast to the pattern seen in the specialist A. maculatum (pollinated specifically by two fly species only). Based on the model presented here, the application of the SAM is predicted for the first two and not expected in the latter species, those predictions being further confirmed by allometric measures. We here demonstrate that while an increase in the female zone occurs in larger inflorescences of generalist species, this does not happen in species demonstrating specific pollinators. This is the first time that this theory is both proposed and empirically tested in zoophilous plants. Its overall biological importance is discussed through its application in other non-Arum systems. © 2011 Springer Science+Business Media B.V. |
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CNRS-UMR 8172 Ecologie des Forêts de Guyane, BP 709, 97387 Kourou, France |
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18728855 (Issn) |
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Export Date: 21 March 2012; Source: Scopus; doi: 10.1007/s11829-011-9164-1; Language of Original Document: English; Correspondence Address: Espíndola, A.; Department of Ecology and Evolution, University of Lausanne, Biophore Building, 1015 Lausanne, Switzerland; email: MariaAnahi.Espindola@unil.ch |
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EcoFoG @ webmaster @ |
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384 |
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Vedel, V.; Rheims, C.; Murienne, J.; Brescovit, A.D. |
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Biodiversity baseline of the French Guiana spider fauna |
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Journal Article |
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2013 |
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SpringerPlus |
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SpringerPlus |
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2 |
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1 |
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1-19 |
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Arachnids; Araneae; Bio monitoring; French Guiana; Neotropics; Species richness |
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The need for an updated list of spiders found in French Guiana rose recently due to many upcoming studies planned. In this paper, we list spiders from French Guiana from existing literature (with corrected nomenclature when necessary) and from 2142 spiders sampled in 12 sites for this baseline study. Three hundred and sixty four validated species names of spider were found in the literature and previous authors' works. Additional sampling, conducted for this study added another 89 identified species and 62 other species with only a genus name for now. The total species of spiders sampled in French Guiana is currently 515. Many other Morphospecies were found but not described as species yet. An accumulation curve was drawn with seven of the sampling sites and shows no plateau yet. Therefore, the number of species inhabiting French Guiana cannot yet be determined. As the very large number of singletons found in the collected materials suggests, the accumulation curve indicates nevertheless that more sampling is necessary to discover the many unknown spider species living in French Guiana, with a focus on specific periods (dry season and wet season) and on specific and poorly studied habitats such as canopy, inselberg and cambrouze (local bamboo monospecific forest). © 2013 Vedel et al. |
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CNRS, EFA, UMR 5174 EDB (Laboratoire Evolution et Diversité Biologique), Université Paul Sabatier, 118 route de Narbonne, F-31062 Toulouse, France |
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21931801 (Issn) |
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Export Date: 25 November 2013; Source: Scopus; doi: 10.1186/2193-1801-2-361; Language of Original Document: English; Correspondence Address: Vedel, V.; Laboratoire d'entomologie Entobios, 5 Bis rue François Thomas, 97310 Kourou, Guyane Française, France; email: vincent.vedel@ecofog.gf |
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EcoFoG @ webmaster @ |
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510 |
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Vedel, V.; Lalague, H. |
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Standardized sampling protocol for spider community assessment in the Neotropical rainforest |
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Journal Article |
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2013 |
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Journal of Entomology and Zoology Studies |
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J. Entomol. Zool. Stud. |
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2 |
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1 |
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18-34 |
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Araneae; Biodiversity; French Guiana; Guianese Shield; Impact Assessment |
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We described, here, a standardized protocol to collect the maximum number of spiders per unit of effort from the different strata of a tropical forestry habitat. This would allow quantifying the richness of a site and would allow spatial and temporal comparisons between sites. This protocol was tested and applied in a pilot study at four sites representing three different forestry habitats of the natural reserve of La Trinité (French Guiana). Results showed every feeding guild was well represented and most of the 30 families found are represented by several individuals. Indices of species richness, number of singletons, species richness estimators from the accumulation curves and diversity and similarity indices were also calculated and all indicated that La Trinité is a rich and diverse site for spiders. The standardized protocol showed here its efficiency and its wide cover of micro-habitats and is, therefore, recommended for any impact assessment or diversity of spider study in tropical forestry environment. |
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EcoFoG @ webmaster @ |
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487 |
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Vedel, V.; Cerdan, A.; Martinez, Q.; Baraloto, C.; Petitclerc, F.; Orivel, J.; Fortunel, C. |
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Day-time vs. Night-time sampling does not affect estimates of spider diversity across a land use gradient in the Neotropics |
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2015 |
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Journal of Arachnology |
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Journal of Arachnology |
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43 |
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3 |
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413-416 |
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Araneae; community; day; night; sampling protocol |
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To obtain a reliable description of spider communities, robust sampling protocols are crucial. However, it remains unclear if descriptions of spider communities in tropical habitats require both day and night sampling. Here we tested whether sampling both day and night in high and low vegetation strata would lead to better diversity estimates of spider communities than sampling at only one period of the day. We determined spider taxonomic diversity in a network of 12 plots in French Guiana along a vegetation gradient. We found high alpha diversity of spiders as expected for a tropical area at every site. We showed strong differences in spider alpha and beta diversity between high and low vegetation strata, while they were similar between day and night sampling. Our results suggest that collecting spiders at only one period is sufficient to describe the diversity of spider communities across land use types in the neotropics. © The American Arachnological Society. |
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Department of Biology, University of Maryland, College Park, MD, United States |
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Export Date: 10 December 2015 |
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EcoFoG @ webmaster @ |
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641 |
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