Nascimbene J.,Museo Tridentino di Science Naturali MTSN |
Nascimbene J.,University of Padua |
Spitale D.,Museo Tridentino di Science Naturali MTSN |
Spitale D.,University of Padua |
And 4 more authors.
Journal of Limnology | Year: 2011
Even though a number of studies have demonstrated the importance of photoautotrophic organisms in spring habitats, investigations that consider several photoautotrophic taxonomic groups are lacking. Within the framework of a multidisciplinary project on springs of the south-eastern Alps, we studied algae, diatoms, lichens, and bryophytes and (1) compared the alpha, beta and gamma diversity, and the composition of the studied groups between carbonate and siliceous springs, (2) estimated the nonrandomness of species combinations within organismal groups, and (3) examined the congruence in species assemblage patterns across taxonomic groups. In 40 springs, 69 species of algae, 110 species of diatoms, 29 species of lichens, and 62 species of bryophytes were found. Diatoms, lichens and bryophytes had higher species-richness in siliceous springs, while other algae had higher richness in carbonate springs. For all taxonomic groups, carbonate and siliceous springs host different assemblages, indicating that both types of substrata contribute to the overall regional diversity of spring photoautotrophs. In individual springs, the photoautotroph groups are characterised by a similar proportion of species of their regional pool, and form relatively speciespoor communities with a high turnover of species among springs. This pattern has important implications for conservation, suggesting that the protection of single sites might not be effective, and that a biodiversity conservation plan for spring habitats should be developed at the regional level, and include a network of sites. Interestingly, the co-occurrence indices suggested that, in individual springs, stochastic processes might the most important mechanisms in the establishment of local assemblages. A weak cross-taxon congruency was found, suggesting that a single taxon surrogate will not adequately represent other photoautotrophic groups. Therefore, spring conservation plans for photoautotrophs should not use one group as a surrogate for overall photoautotrophic diversity, but should adopt the use of different taxonomic groups.
Remondino F.,Bruno Kessler Foundation FBK |
Rizzi A.,Museo Tridentino di Science Naturali MTSN |
Girardi S.,Bruno Kessler Foundation FBK |
Petti F.M.,Bruno Kessler Foundation FBK |
Avanzini M.,Museo Tridentino di Science Naturali MTSN
Photogrammetric Record | Year: 2010
Ichnology deals with the traces of prehistoric organisms and thus with the study of dinosaur footprints and tracks. This paper reports on a reliable and precise methodology developed to integrate high-resolution close range photogrammetry and range sensors for 3D surveys of dinosaur footprints. The 3D footprint and track models recovered here yield a great deal of accurate morphological and morphometrical information, providing palaeoichnologists with a simpler and cheaper way to document track fossils and the opportunity to formulate new hypotheses about the dynamics of dinosaur locomotion. © 2010 The Authors. The Photogrammetric Record © 2010 The Remote Sensing and Photogrammetry Society and Blackwell Publishing Ltd.