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Author |
Gond, V.; Bartholome, E.; Ouattara, F.; Nonguierma, A.; Bado, L. |
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Title |
Monitoring and mapping of waters and wetlands in arid regions using the SPOT-4 VEGETATION imaging system |
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Journal Article |
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Year |
2004 |
Publication |
International Journal of Remote Sensing |
Abbreviated Journal |
Int. J. Remote Sens. |
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Volume |
25 |
Issue |
5 |
Pages |
987-1004 |
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Abstract |
Monitoring the state of small waterbodies and wetlands is very useful in dry regions, because their existence is entirely controlled by the rhythm of local rainfall. On VEGETATION image colour composites, waterbodies and marshy vegetation show up clearly. Yet simple image classification does not yield sufficiently good results because 'spectral signatures' vary significantly together with the ecological conditions of these surfaces. A robust contextual procedure taking into account local contrast was successfully developed and tested. A systematic validation was carried out and a map of waterbodies and wetlands was produced for Burkina Faso and neighbouring regions. |
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Ctr Commun Rech, I-21020 Ispra, VA, Italy, Email: valery.gond@cirad.fr |
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TAYLOR & FRANCIS LTD |
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0143-1161 |
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ISI:000187996500007 |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
266 |
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Author |
Yazdani, R.; Scotti, I.; Jansson, G.; Plomion, C.; Mathur, G. |
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Title |
Inheritance and diversity of simple sequence repeat (SSR) microsatellite markers in various families of Picea abies |
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Journal Article |
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Year |
2003 |
Publication |
Hereditas |
Abbreviated Journal |
Hereditas |
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Volume |
138 |
Issue |
3 |
Pages |
219-227 |
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Abstract |
A large number of sequence-specific SSRs were screened by using electrophoresis on metaphore agarose gels with the bands visualized by ethidium bromide staining. Many SSRs appeared as codominant and many as dominant markers, with presence or absence of bands. A simple Mendelian inheritance pattern for most codominant and dominant SSR loci was found. For many codominant SSR markers, null alleles were detected. The proportion of dominant microsatellites detected in this study (close to 50 %) was much higher than that commonly reported in many other studies. A high proportion of dominant markers together with a high frequency of codominant markers with null alleles may represent two important limitations for the use of microsatellites in different studies. On the other hand, many polymorphic codominant SSR microsatellite markers were found to be highly repeatable, and can be used for population studies, seed certification, quality control of controlled crosses, paternity analysis, pollen contamination, and mapping of QTL in related families. In this paper, we report on the inheritance pattern and diversity of codominant and dominant SSR microsatellites in seven families of Picea abies sharing a common mother. |
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Swedish Univ Agr Sci, Dept Plant Biol & Forest Genet, Uppsala, Sweden |
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BLACKWELL MUNKSGAARD |
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0018-0661 |
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ISI:000187074000010 |
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EcoFoG @ eric.marcon @ |
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268 |
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Author |
Vedel, V.; Apostolou, Z.; Arthur, W.; Akam, M.; Brena, C. |
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Title |
An early temperature-sensitive period for the plasticity of segment number in the centipede Strigamia maritima |
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Journal Article |
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Year |
2010 |
Publication |
Evolution & Development |
Abbreviated Journal |
Evol Dev |
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Volume |
12 |
Issue |
4 |
Pages |
347-352 |
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1520-541X |
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WOS:000279440800002 |
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EcoFoG @ eric.marcon @ |
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278 |
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Author |
Guerrero, R.J.; Delabie, J.H.C.; Dejean, A. |
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Title |
Taxonomic Contribution to the aurita Group of the Ant Genus Azteca (Formicidae: Dolichoderinae) |
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Journal Article |
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Year |
2010 |
Publication |
Journal of Hymenoptera Research |
Abbreviated Journal |
J. Hymenopt. Res. |
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Volume |
19 |
Issue |
1 |
Pages |
51-65 |
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Abstract |
We describe five new species in the aurita group of the genus Azteca: Azteca andreae sp. n. (French Guiana), Azteca diabolica sp. n. (Panama), Azteca laurae sp. n. (Brazil), Azteca linamariae sp. n. (Brazil and Colombia) and Azteca snellingi sp. n. (Panama). Four of these new species are based on gynes, while the last is based only on the worker caste. All of them bear the aurita group characteristics. The second taxon is remarkable, as it differs from all of the other members of the group in the exaggerated, horn-like extensions of the posterolateral vertex margins. Azteca snellingi sp. n. is named in honor of our colleague, Roy Snelling, in tribute to his life-long contribution to knowledge of the world of Hymenoptera. A key to all known species of the aurita group, based on gynes, is provided. We report also for the first time an intercast case for the genus Azteca, based on an Azteca schimperi specimen. |
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[Guerrero, Roberto J.] Univ Magdalena, INTROPIC, Grp Invest Insectos Neotrop, Santa Marta, Magdalena, Colombia, Email: robertojoseguerreroflorez@gmail.com |
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INT SOC HYMENOPTERISTS |
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ISSN |
1070-9428 |
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Notes |
ISI:000285775800005 |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
279 |
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Author |
Petillon, J.; Lambeets, K.; Montaigne, W.; Maelfait, J.P.; Bonte, D. |
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Title |
Habitat structure modified by an invasive grass enhances inundation withstanding in a salt-marsh wolf spider |
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Journal Article |
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Year |
2010 |
Publication |
Biological Invasions |
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Volume |
12 |
Issue |
9 |
Pages |
3219-3226 |
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1387-3547 |
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WOS:000280892600033 |
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EcoFoG @ webmaster @ |
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287 |
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Petillon, J.; Montaigne, W.; Renault, D. |
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Title |
Hypoxic coma as a strategy to survive inundation in a salt-marsh inhabiting spider |
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Journal Article |
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Year |
2009 |
Publication |
Biology Letters |
Abbreviated Journal |
Biol. Lett. |
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Volume |
5 |
Issue |
4 |
Pages |
442-445 |
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1744-9561 |
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WOS:000267881700002 |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
288 |
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Author |
Siebicke, L.; Steinfeld, G.; Foken, T. |
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Title |
CO2-gradient measurements using a parallel multi-analyzer setup |
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Journal Article |
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Year |
2011 |
Publication |
Atmospheric Measurement Techniques |
Abbreviated Journal |
Atmos. Meas. Tech. |
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Volume |
4 |
Issue |
3 |
Pages |
409-423 |
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Abstract |
Accurate CO2 concentration gradient measurements are needed for the computation of advective flux terms, which are part of the full Net Ecosystem Exchange (NEE) budget equation. A typical draw back of current gradient measurement designs in advection research is the inadequate sampling of complex flow phenomena using too few observation points in space and time. To overcome this draw back, a new measurement design is presented which allows the parallel measurement of several sampling points at a high frequency. Due to the multi-analyzer nature of the design, inter-instrument bias becomes more of a concern compared to conventional setups. Therefore a statistical approach is presented which allows for accurate observations of concentration gradients, which are typically small in relation to analyzer accuracy, to be obtained. This bias correction approach applies a conditional, time dependent signal correction. The correction depends on a mixing index based on cross correlation analysis, which characterizes the degree of mixing of the atmosphere between individual sample points. The approach assumes statistical properties of probability density functions (pdf) of concentration differences between a sample point and the field average which are common to the pdf's from several sample points. The applicability of the assumptions made was tested by Large Eddy Simulation (LES) using the model PALM and could be verified for a test case of well mixed conditions. The study presents concentration time series before and after correction, measured at a 2 m height in the sub-canopy at the FLUXNET spruce forest site Waldstein-Weidenbrunnen (DE-Bay), analyzes the dependence of statistical parameters of pdf's from atmospheric parameters such as stratification, quantifies the errors and evaluates the performance of the bias correction approach. The improvements that are achieved by applying the bias correction approach are one order of magnitude larger than possible errors associated with it, which is a strong incentive to use the correction approach. In conclusion, the presented bias correction approach is well suited for – but not limited to – horizontal gradient measurements in a multi-analyzer setup, which would not have been reliable without this approach. Finally, possible future improvements of the bias correction approach are outlined and further fields of application indicated. |
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[Siebicke, L.; Foken, T.] Univ Bayreuth, Dept Micrometeorol, Bayreuth, Germany, Email: lukas.siebicke@ecofog.gf |
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Copernicus Gesellschaft Mbh |
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1867-1381 |
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Notes |
ISI:000288911000002 |
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EcoFoG @ webmaster @ |
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303 |
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Author |
Ruelle, J.; Beauchene, J.; Yamamoto, H.; Thibaut, B. |
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Title |
Variations in physical and mechanical properties between tension and opposite wood from three tropical rainforest species |
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Journal Article |
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Year |
2011 |
Publication |
Wood Science and Technology |
Abbreviated Journal |
Wood Sci. Technol. |
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Volume |
45 |
Issue |
2 |
Pages |
339-357 |
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Abstract |
Growth strains were measured in situ in nine trees of three species from a French Guiana tropical rainforest in a clearly active verticality restoration process. The aim was to detect tension wood within the samples. Wood specimens were cut in the vicinity of the growth strain measurements in order to determine the microfibril angle and some mechanical and physical properties. As suspected, tensile growth strain was much higher in tension wood zones, as shown by the slightly higher longitudinal modulus of elasticity. Conversely, tension wood showed reduced compression strength. Longitudinal shrinkage was much higher in tension wood than in opposite wood. Clear relationships between the microfibril angle and longitudinal properties were noted in comparison (i) with those observed in gymnosperm compression wood and (ii) with expected relationships from the organization of wood fibres cell wall structure. |
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[Ruelle, Julien; Yamamoto, Hiroyuki] Nagoya Univ, Grad Sch Bioagr Sci, Nagoya, Aichi 4648601, Japan, Email: julien.ruelle@ecofog.gf |
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Springer |
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ISSN |
0043-7719 |
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ISI:000289477300013 |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
305 |
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Author |
Dejean, A.; Corbara, B.; Leroy, C.; Delabie, J.H.C.; Rossi, V.; Cereghino, R. |
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Title |
Inherited Biotic Protection in a Neotropical Pioneer Plant |
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Journal Article |
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Year |
2011 |
Publication |
PLoS One |
Abbreviated Journal |
PLoS One |
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Volume |
6 |
Issue |
3 |
Pages |
e18071 |
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Abstract |
Chelonanthus alatus is a bat-pollinated, pioneer Gentianaceae that clusters in patches where still-standing, dried-out stems are interspersed among live individuals. Flowers bear circum-floral nectaries (CFNs) that are attractive to ants, and seed dispersal is both barochorous and anemochorous. Although, in this study, live individuals never sheltered ant colonies, dried-out hollow stems – that can remain standing for 2 years – did. Workers from species nesting in dried-out stems as well as from ground-nesting species exploited the CFNs of live C. alatus individuals in the same patches during the daytime, but were absent at night (when bat pollination occurs) on 60.5% of the plants. By visiting the CFNs, the ants indirectly protect the flowers – but not the plant foliage – from herbivorous insects. We show that this protection is provided mostly by species nesting in dried-out stems, predominantly Pseudomyrmex gracilis. That dried-out stems remain standing for years and are regularly replaced results in an opportunistic, but stable association where colonies are sheltered by one generation of dead C. alatus while the live individuals nearby, belonging to the next generation, provide them with nectar; in turn, the ants protect their flowers from herbivores. We suggest that the investment in wood by C. alatus individuals permitting still-standing, dried-out stems to shelter ant colonies constitutes an extended phenotype because foraging workers protect the flowers of live individuals in the same patch. Also, through this process these dried-out stems indirectly favor the reproduction (and so the fitness) of the next generation including both their own offspring and that of their siblings, all adding up to a potential case of inclusive fitness in plants. |
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[Dejean, Alain; Leroy, Celine] CNRS, Ecol Forets Guyane UMR CNRS 8172, Kourou, France, Email: alain.dejean@wanadoo.fr |
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Public Library Science |
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1932-6203 |
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ISI:000289057200023 |
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EcoFoG @ webmaster @ |
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306 |
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Author |
Sist, P.; Brown, N. |
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Title |
Silvicultural intensification for tropical forest conservation: a response to Fredericksen and Putz |
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Journal Article |
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Year |
2004 |
Publication |
Biodiversity and Conservation |
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Volume |
13 |
Issue |
12 |
Pages |
2381-2385 |
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0960-3115 |
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WOS:000225691300011 |
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EcoFoG @ webmaster @ |
Serial |
308 |
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