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Auteur Rodolfo Gentili |
Documents disponibles écrits par cet auteur (2)
trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la rechercheA multi-level analysis to evaluate the extinction risk of and conservation strategy for the aquatic fern Marsilea quadrifolia L. in Europe / I. Bruni in Aquatic Botany, vol. 111 (Année 2013)
Titre : A multi-level analysis to evaluate the extinction risk of and conservation strategy for the aquatic fern Marsilea quadrifolia L. in Europe Type de document : texte imprimé Auteurs : I. Bruni, Auteur ; Rodolfo Gentili, Auteur ; F. (de) Mattia, Auteur ; P. Cortis, Auteur ; G. Rossi, Auteur ; M. Labra, Auteur Année de publication : 2013 Article en page(s) : pp. 35-42 Langues : Anglais (eng) Catégories : [habitats/milieux] 22 - Eaux douces stagnantes
[Espèces (in biblio)] Marsilea quadrifoliata
[ZG] EuropeMots-clés : herbicide restauration génétique agrosystème génétique biologie de la conservation plante aquatique Résumé : "This study investigated the conservation status of Marsilea quadrifolia, an endangered fern founding paddy fields, irrigation ditches and ponds. An evaluation at the European level based on IUCN criteria showed that the extent of occurrence (EOO) of M. quadrifolia has decreased from5,930,000 km2 to 5,774,000 km2 during the past decade, whereas its area of occupancy (AOO) has decreased from 620 to 400 km2 (approximately 35.5%). These findings allowed the species to be upgraded from the IUCN classification of Near Threatened to Vulnerable. The agricultural chemical treatments seem to be the main extinction cause of M. quadrifolia, therefore we performed toxicological with 7 most common rice herbicides. Young plantlets were incubated for 96h with each herbicide at three different concentrations : TQ (Tale Quale, chosen in accordance with the suggested dose for rice fields described on the product label), 1:100 and1:1.000. Results suggested that survival of the plantlets depended on the herbicide and concentration used, and ranged between 0 and 80%, and no survival at ambient concentrations for 4(Aura, Aura + Dash, Clincher and Viper) out of the 8 chosen herbicides. We conclude that herbicides represent one of the principal threats to the survival of this species. Finally, a DNA analysis using the AFLP approach was employed to identify the most suitable genetic pool for plant reintroduction efforts. The data show that the analysed populations of M. quadrifolia suffered from low genetic variability (Nei’s gene diversity varied from 0.025 to 0.036). However, the analysis of the distribution of genetic variability suggested that 4 populations were characterised by different genetic traitst that are useful in defining a genetic pool for plant conservation. This study highlights a strategy for implementing a plan of action for species growing in agro-ecosystems based on an integrated approach that is able to clarify the species conservation status, the principal threat factor and the genetic pool to be used for species conservation and reintroduction." (source : auteur) Type de publication : périodique Référence biblio : Bruni I., Gentili R., Mattia F. (de), Cortis P., Rossi G., Labra M., 2013 - A multi-level analysis to evaluate the extinction risk of and conservation strategy for the aquatic fern Marsilea quadrifolia L. in Europe. Aquatic Botany, 111 : 35-42. ID PMB : 58984 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=58984
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Titre : Reintroduction of a dioecious aquatic macrophyte (Stratiotes aloides L.) regionally extinct in the wild. Interesting answers from genetics Type de document : texte imprimé Auteurs : Simone Orsenigo, Auteur ; Rodolfo Gentili, Auteur ; Alfons J.P. Smolders, Auteur ; Andrey Efremov, Auteur ; Graziano Rossi, Auteur ; Nicola M. G. Ardenghi, Auteur ; Sandra Citterio, Auteur ; Thomas Abeli, Auteur Année de publication : 2017 Article en page(s) : pp. 10-23 Langues : Anglais (eng) Mots-clés : lake pond plante menacée genetics reintroduction macrophyte nutrient enrichment pollution Résumé : "The reintroduction of a plant species regionally extinct in the wild poses a stimulating conservation challenge. If the species is dioecious and the ex situ preserved population is only of one sex, the challenge is even more difficult. To assess whether the female population of Stratiotes aloides originally studied requires a reinforcement to increase its genetic variation, and to determine from which source male individuals should be taken to re‐establish a viable population, the genetic structure of nine different accessions of S. aloides across Europe and Asia were analysed – six native populations and the last three Italian populations, preserved ex situ.
Amplified fragment length polymorphism (AFLP) fingerprinting of 190 individuals from these populations was performed using six primer combinations and chromosome counts.
AFLP markers revealed medium to high values of genetic diversity at the population level, unexpectedly including residual ex situ accessions. Neighbour‐joining tree, PCoA and STRUCTURE analyses indicate the presence of three genetic patterns identifiable in the central‐western, central and eastern Europe–Asian populations. Chromosome counts revealed the presence of diploid (2n = 24) and tetraploid (2n = 48) populations.
Similarity between populations belonging to different hydrographical basins, and differences between neighbouring populations could be explained through long‐distance bird‐mediated dispersal events. Genetic analysis showed that reinforcement with female individuals from other European populations to increase the genetic diversity of the Italian female population is not necessary. Surprisingly, the geographically closest male population (Bavaria) to the Po basin is not the best option for male reintroduction. Instead, male individuals should be reintroduced from the Rhine basin (Netherlands) and eastern part of the Danube basin (Romania)."Type de publication : périodique Référence biblio : Orsenigo S., Gentili R., Smolders A.-P., Efremov A., Rossi G., Ardenghi N.-G., Citterio S., Abeli T., 2017 - Reintroduction of a dioecious aquatic macrophyte (Stratiotes aloides L.) regionally extinct in the wild. Interesting answers from genetics. Aquatic Conservation : Marine and Freshwater Ecosystems, 27 (1) : 10-23. DOI : 10.1002/aqc.2626 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66301
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