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Garcia S.,University of Barcelona | Garnatje T.,Institute Botanic Of Barcelona Ibb Csic Icub | Kovarik A.,Academy of Sciences of the Czech Republic
Chromosoma | Year: 2012

Number, position and structure of the 5S and 18S- 5.8S-26S ribosomal DNA (rDNA) loci are important species characteristics. In recent decades, we have witnessed accumulation of rDNA data, and there is a need to compile, store and analyse this information, and to make it accessible to a broader scientific community. An online resource, accessible at www.plantrdnadatabase.com, has been developed to accomplish these goals. Current knowledge regarding chromosomal rDNA sites is provided for more than 1,000 plant species (including more than 1,400 different accessions). The data comes from fluorescent in situ hybridisation experiments (FISH) from more than 300 publications. Additional information is also displayed, such as ploidy level, mutual arrangement of rRNA genes, genome size and life cycle. The webpage is intuitive and user-friendly, including different search options, and currently holds information published (or in press) up until January 2011; frequent updates are planned. We expect this database to be used for data-mining, analysing rDNAs from different angles, unit organisation, distribution, evolution and linkage of rDNA patterns with phylogenetic relationships. © Springer-Verlag 2012.

Rull V.,Institute Botanic Of Barcelona Ibb Csic Icub
Collectanea Botanica | Year: 2014

This paper discusses the issue of the origin and maintenance of biodiversity on tropical mountains, with emphasis on the Neotropics, and concludes that present-day biodiversity patterns of highland biotas cannot be understood without the combined action of Neogene tectonics and Pleistocene climatic changes. © 2014 CSIC.

Melendez-Galan A.,Institute Botanic Of Barcelona Ibb Csic Icub
Collectanea Botanica | Year: 2012

A brief bibliography about the Salvador family from Barcelona, its work and its "cabinet of curiosities" is presented here.

Rull V.,Institute Botanic Of Barcelona Ibb Csic Icub
Collectanea Botanica | Year: 2012

The recent unexpected discovery that living Cycadales are not Jurassic-Cretaceous (200-65 Mya) relicts, as all their extant genera began to diversify during the Late Miocene (12 Mya), has challenged a classical evolutionary myth. This brief note shows how this finding may also provide new clues on the shaping of the high tropical biodiversity.

Vegas-Vilarrubia T.,University of Barcelona | Nogue S.,University of Oxford | Rull V.,Institute Botanic Of Barcelona Ibb Csic Icub
Biological Conservation | Year: 2012

Current global average temperatures are 2. °C cooler than during the last interglacial period. The expected increase in temperature during the 21st century will be most stressful for cold-adapted and stenothermic mountain species, forcing them to migrate upwards, and eventually to concentrate into either large areas with favourable climates (refugia) or small stands under locally favourable microclimates (microrefugia). We investigate potential refugia in the neotropical Guayana Highlands mountain biome (Pantepui), consisting of ~50 isolated table mountains (tepuis), to develop strategies for conserving biodiversity during future global warming. We predict the amount of loss of altitudinal habitats of endemic vascular flora of 26 tepuis and evaluate potential threats to these taxa with respect to species extinction, habitat loss, habitat connectivity and the degree of isolation. We compare past, present and future Pantepui landscape configurations through fragmentation analysis and identify potential in situ refugia. Spatial analysis forecasts more species isolation and declining biodiversity at the end of this century relative to current and past levels. Habitats are predicted to experience >80% loss, with the disappearance of 38 habitat patches. One large patch (Chimantá massif) accounts for 46% of the predicted remaining habitat. This patch can be considered a potential refugium for future vascular flora, as it is predicted to contain some present-day resistant species from lower altitudinal levels and other species eventually persisting in microrefugia. The easternmost Pantepui district, containing the Chimantá massif and other tepuis, seems to be the most suitable for the application of in situ conservation strategies. © 2012 Elsevier Ltd.

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