Search results for "diversity"
showing 10 items of 3950 documents
ANTIMICROBIAL ACTIVITY FROM POLYPEPTIDE-RICH EXTRACTS OF THE SEAGRASS POSIDONIA OCEANICA
2021
The present study was carried out to assess the antibacterial, antifungal and antibiofilm properties of polypeptide-rich extracts isolated from green leaves and rhizomes of Mediterranean seagrass Posidonia oceanica (L. Delile) (Posidoniaceae). The seagrass was collected, washed with freshwater, grinded with liquid nitrogen in order to obtain fine powders that were exposed to extraction by acetic acid and antiproteases. The crude extracts isolated from leaves and rhizomes of P. oceanica were subjected to microbiological assays to evaluate the antibacterial, antifungal and antibiofilm activity of polypeptide fraction against two reference bacterial strains Staphylococcus aureus ATCC 25923 and…
Didactic transposition of the biodiversity concept. A study of Spanish high-school textbooks
2021
Este trabajo estudia la presencia y complejidad en el tratamiento del concepto de diversidad biológica en libros de texto de educación secundaria, tanto de la obligatoria (ESO) como del bachillerato de España. Se recopilaron trabajos científicos de la «comunidad de expertos» con el objetivo de definir el ámbito conceptual de la biodiversidad, que actúa de vigilante epistemológico en el proceso de transposición didáctica. Los resultados mostraron una multiplicidad de definiciones de la biodiversidad en libros de texto, con un fuerte predominio de reducción a la idea de número de especies (riqueza), lo que pone en evidencia su desactualización. A la luz de este estudio, el listado de contenid…
Hierarchical structure of the Sicilian goats revealed by Bayesian analyses of microsatellite information
2010
Genetic structure and relationship amongst the main goat populations in Sicily (Girgentana, Derivata di Siria, Maltese and Messinese) were analysed using information from 19 microsatellite markers genotyped on 173 individuals. A posterior Bayesian approach implemented in the program STRUCTURE revealed a hierarchical structure with two clusters at the first level (Girgentana vs. Messinese, Derivata di Siria and Maltese), explaining 4.8% of variation (amovaФ(ST) estimate). Seven clusters nested within these first two clusters (further differentiations of Girgentana, Derivata di Siria and Maltese), explaining 8.5% of variation (amovaФ(SC) estimate). The analyses and methods applied in this stu…
Offsetting harmful ecological impacts by restoring conservation areas
2019
Ihmistoiminnasta aiheutuvat ekologisesti haitalliset vaikutukset voidaan kompensoida tuottamalla luonnon kannalta hyötyjä, esimerkiksi ennallistamalla elinympäristöjä tai perustamalla uusia luonnonsuojelualueita. Elinympäristön ennallistaminen mahdollistaa elinympäristön palautumisen kohti luonnontilaa. Tämän tutkimuksen tarkoituksena oli selvittää, voitaisiinko jo aiemmin suojelluilla alueilla tehtävällä ennallistamisella saavuttaa ekologisessa kompensaatiossa tarvittava luontohyöty. Voi ehkä vaikuttaa siltä, että tällä tavoin tuotetut hyödyt eivät ole luonnon kannalta lisäisiä, koska toimenpiteet kohdistuvat alueisiin, jotka ovat jo suojeltu. Suomessa on kuitenkin tällä hetkellä monia suo…
Social impacts of biodiversity offsetting: A review
2022
Biodiversity offsetting is the widely studied last step of the mitigation hierarchy. Despite numerous studies and the methodological development completed for biodiversity calculations, the human aspect remains unsolved. Biodiversity conservation is typically governed at national or state levels, but the harm caused to biodiversity as well as people occurs locally. In biodiversity offsetting, biodiversity values can be relocated far from the original area, but relocating the values people hold regarding their nearby nature may not be possible. Acknowledging the local people's hopes and values may further complicate biodiversity offsetting, therefore it emphasises even more the need to avoid…
Phytosociological characterization of the Celtis tournefortii subsp. aetnensis microwoods in Sicily
2014
A work on the Celtis tournefortii subsp. aetnensis vegetation, endemic species located in disjointed sites in the Sicilian inland, is here presented. It forms microwoods with a relict character established on screes and detrital coverages, on a variety of lithological substrates (volcanics, limestones, quartzarenites). Based on the phytosociological analysis carried out in the territory, these vegetation aspects are framed in the alliance Oleo-Ceratonion, within which a new association (Pistacio terebinthi-Celtidetum aetnensis) is described, in turn diversified in the following subassociations: a) typicum subass. nova, on detrital calcareous cones of the north-western part of Sicily, in the…
The ancient urban agroforestry systems of the Conca D'Oro (Palermo, Italy) need protection to defend the city
2019
The favorable environmental conditions together with the ancient agronomic practices, e.g. the irrigation systems introduced by the Arabs, have made the plain surrounding Palermo, known as Conca d’Oro, the unique agriculture landscape famous worldwide. Several tree and vegetable species have spread throughout in time but the new crops, instead of replacing the others, were often integrated exploiting the different heights of the tree canopies. The result was the creation of complex agroecosystems characterized by orchards with several layers of trees (as walnut, loquat, citrus) and empty spaces where the farmers cultivated vegetables. The grass fed the animals in the stables while manure wa…
The indigenous germplasm of chestnut (Castanea sativa Mill.) in the Etna area: Ecophysiological aspects and morphological traits of the fruits
2006
In Sicily, chestnut ( Castanea sativa Mill.) is present at altitudes that run from 300 to 1600 m asi and, due to the extreme variability of the environmental conditions, a large autochthonous germplasm has been dif- ferentiated. On the island, starting back as far as ancient times, chestnut was an important crop for rural com- munities but, after the Second World War, the tendency of the rural population to move to the capital cities and because of Cryphonectria parasitica attacks, chestnut plantings reduced dramatically. Recently, an investigation has commenced in the Etna area to collect the residual genetic resources of chestnut. Although many of the che- stnut genotypes found on the slo…
Biodiversity as a source of innovation and development: the Trapani and Marsala saltworks
2014
The crustacean fauna of Bayan Onjuul area (Tôv Province, Mongolia) (Crustacea: Branchiopoda, Copepoda, Ostracoda)
2015
Due to the wide extension of the country and to the shortness of the ice-free season, the inlandwater crustacean fauna of Mongolia is, to date, incompletely known. However, based on the available literature, Mongolian inland waters appear to be characterised by a high biodiversity, including some taxa still waiting to be described. Novel data on the branchiopod, copepod, and ostracod crustaceans from central Mongolian steppe, from the “Tuul” and “Umard goviin guveet-Khalhiin” hydrographical basins, are presented herein. While large branchiopods, some anomopod families, and copepods are well-represented in the collected samples, ostracods are rare, and the anomopod family Chydoridae is appar…