1,720,984 research outputs found
Morphological And Morphometric Variations In Middle And Late Pleistocene Microtus Arvalis And Microtus Agrestis Populations: Chronological Insight, Evolutionary Trends And Palaeoclimatic And Palaeoenvironmental Inferences
Full text linkPer aquesta tesi doctoral, les poblacions de M. arvalis i M. agrestis procedents de 13 jaciments de la Península Ibèrica, 14 de la Península italiana, nou de la Conca dels Càrpats, tres de Croàcia i dos de Bèlgica han estat analitzats des d'un punt de vista morfològic i morfomètric. Aquest estudi s'ha realitzat per tal d' accentuar similituds i diferències entre les poblacions d'ambdós especies, possibles patrons d'evolució comuns i la influència de les condicions climàtiques i ambientals sobre les seves variacions poblacionals. Comparant material de diferents cronologies i diferents procedències geogràfiques, s'han pogut refinar les atribucions cronològiques dels jaciments paleontològics i arqueològics de la regió mediterrània i identificar llinatges divergents, signes inicials d'especiació, esdeveniments de migració i desplaçament de poblacions. A més, es proposa l'ús d'un nou índex, Lagr / Larv, per quantificar les variacions entre si en la talla de M. agrestis i M. arvalis. Aquest índex ha demostrat ser un excel·lent indicador del nivell general d'humitat i permet detectar oscil·lacions i variacions en les condicions ambientals en l'entorn d'un jaciment determinat.Para esta tesis doctoral, las poblaciones de M. arvalis y M. agrestis del Pleistoceno Medio y Superior procedentes de 13 yacimientos de la Península Ibérica, 14 de la Península Italiana, nueve de la Cuenca de los Cárpatos, tres de Croacia y dos de Bélgica han sido analizadas desde una perspectiva morfológica y desde un punto de vista morfométrico. Este estudio se ha llevado a cabo con la finalidad de destacar las similitudes y diferencias entre las diferentes poblaciones de ambas especies, posibles patrones comunes de evolución y la influencia de las condiciones climáticas y ambientales en sus variaciones poblacionales. Comparando material de diferentes cronologías y diferente procedencia geográfica, ha sido posible refinar las atribuciones cronológicas de los yacimientos paleontológicos y arqueológicos de la región mediterránea e identificar linajes divergentes, muestras tempranas de especiación, eventos de migración y desplazamiento de poblaciones. Además, proponemos el uso de un nuevo índice, Lagr / Larv, para cuantificar las variaciones entre sí del tamaño de M. agrestis y M. arvalis. Este índice ha demostrado ser un excelente indicador del nivel general de humedad y, permite detectar oscilaciones y variaciones en las condiciones ambientales en los alrededores de un yacimiento determinado.For this PhD thesis, Middle and Late Pleistocene populations of M. arvalis and M. agrestis coming from 13 sites of the Iberian Peninsula,14 sites of the Italian Peninsula, nine of the Carpathian Basin, three of Croatia and two of Belgium were analysed from a morphological and morphometric point of view, in order to underlie similarities and differences among them, possible common patterns of evolution and the influence of climatic and environmental conditions on their variations. Comparing samples from different chronologies and different geographic provenance, it was possible to refine the chronological attributions of palaeontological and archaeological sites of the Mediterranean region and to identify divergent lineages, early signs of speciation, immigration events and displacement of populations. Furthermore, we propose the use of a new index, Lagr/Larv, to quantify the variations in size of M. agrestis and M. arvalis in relation to each other. This index proved to be an excellent indicator of the general humidity level and allow to detect oscillations and variations in the environmental conditions in the surroundings of a given sites
Small mammals from Mondeval de Sora (San Vito di Cadore, Belluno): paleoenvironmental differences between early and late Holocene
No full textI resti fossili di micromammiferi provenienti da Mondeval de Sora (VF1, settore I e III) sono stati studiati allo scopo di ottenere una ricostruzione dell’ambiente nelle immediate vicinanze del sito durante l’Olocene. Lo studio tassonomico ha portato all’identificazione di 14 specie, mentre stru- menti statistici come l’indice di Simpson e il metodo dell’Habitat Weighting sono stati impiegati per esaminare l’insieme faunistico dal punto di vista biologico ed ecologico. Il settore I ha restituito un basso numero di resti (N.I. totale 24), mentre il settore III si è dimostrato più ricco (N.I. totale 148) permettendo di osservare attraverso la sequenza i cambiamenti ambientali avvenuti tra l’inizio e la fine dell’Olocene. In particolare, le variazioni nell’associazione di micromammiferi indicano il pas- saggio da un ambiente prativo con buona copertura del terreno durante l’inizio dell’Olocene (ma- cro-unità mesolitica) ad uno con scarsa copertura e rocce esposte durante la fine dell’Olocene (macro-unità protostorica e storica). Inoltre, la presenza di Sciurus vulgaris testimonia la vicinanza al sito di aree boschive, suggerendo un limite degli alberi probabilmente ad altitudine più elevata rispetto all’attuale
Middle to Late Pleistocene environmental and climatic reconstruction of the human occurrence at Grotta Maggiore di San Bernardino (Vicenza, Italy) through the small-mammal assemblage
No full textGrotta Maggiore di San Bernardino, located at an altitude of 135ma.s.l. in the Berici Hills in northeastern Italy, is an archaeological site with a discontinuous sedimentary sequence dating from Marine Isotope Stage 7 (MIS 7) to MIS 3. In this paper we present for the first time a palaeoenvironmental and palaeoclimatic reconstruction of the sequence based on small-mammal (insectivore, bat and rodent) assemblages. Coupled with biochronological data and absolute dating together with previous studies on large mammals, birds and other studies on small mammals and pollen from comparable time-spans in Italy, the results enable us clearly to identify distinct climatic periods: the end of MIS 7 (7c to 7a) in units VIII-VII, MIS 5d in unit V, and probably MIS 5b in unit IV and an indeterminateMIS 3 interstadial in units III-II. Finally, the study shows that the early Middle Palaeolithic human occupation in Italy occurs during mild and temperate sub-stages of MIS 7 and that human groups with the same techno-cultural background (Mousterian) were well adapted to the changing environmental and climatic conditions of theMiddle to Late Pleistocene in this part of southern Europe.info:eu-repo/semantics/publishedVersio
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Grotta dei Santi, Monte Argentario (Grosseto) : The small mammals from the mousterian layers.
No full textSmall and large mammals from the Ciota Ciara cave (Borgosesia, Vercelli, Italy): An Isotope Stage 5 assemblage
No full textThe Ciota Ciara cave is located within the Monte Fenera karst system (Borgosesia, Vercelli, Italy) at 670 m a.s.l. The cave entrance presents a deposit with Mousterian quartz and flint industry. The faunal remains from Stratigraphic Units 13, 14 and 103 are the subject of this work and are presented here as a whole for the first time. The large mammal assemblage is dominated by Ursus spelaeus. In addition, a few remains of carnivores such as Panthera leo spelaea, Panthera pardus, Meles meles have been found together with ungulates such as Cervus elaphus and Rupicapra rupicapra. The small mammal assemblage is characterized by a high biodiversity, especially in bats, by the dominance of Clethrionomys glareolus and by a relatively large number of Pliomys coronensis, a species that seems to disappear from the Italian Peninsula at the end of Marine Isotope Stage 5 or during the beginning of MIS 4. The changes in frequency of the small and large mammals between the two S.U. suggest a change from a relatively cold-humid (S.U. 14) to a warmer-still humid climate (S.U. 13). Although no radiometric dates are available yet, the small and large mammal assemblages, the presence of Pliomys coronensis and the climate change inferred by the variation of the small mammal frequencies allow us to correlate these two units of the Ciota Ciara cave to a relatively warm moment of Marine Isotope Stage 5.La grotte Ciota Ciara est située dans le complexe karstique du Monte Fenera (Borgosesia, Vercelli, Italie) à 670 m a.s.l. Les nombreuses campagnes de fouilles ont permis de mettre en évidence des dépôts à industries moustériennes sur quartz et silex à l’entrée de la grotte. Ce travail se base sur l’étude des restes fauniques de ces dépôts, et particulièrement des unités stratigraphiques 13, 14 et 103. Ces unités se caractérisent par la présence d’un large assemblage de grands mammifères dominé par Ursus spelaeus et quelques restes de carnivores tels que Panthera leo spelaea, Panthera pardus, Meles meles, ainsi que des ongulés comme Cervus elaphus et Rupicapra rupicapra. Les assemblages de grands mammifères de la péninsule Italique du stade isotopique 5 sont relativement bien connus, ce qui n’est pas le cas des assemblages à petits mammifères. En effet, seulement quelques sites datés du MIS 5, principalement dans le Sud de la péninsule, ont révélé la présence de quelques espèces de micromammifères. Dans le site de Ciota Ciara, l’assemblage de micromammifères se caractérise par une grande biodiversité, particulièrement chez les chauves-souris, et une dominance de Clethrionomys glareolus et un relativement grand nombre de Pliomys coronensis, une espèce qui semble disparaître de la péninsule Italique à la fin du stade isotopique 5 ou au début du stade 4. Le changement dans la fréquence de petits et grands mammifères entre les unités stratigraphiques 13 et 14 suggère un passage d’un climat relativement humide (US 14) à un climat humide plus tempéré (US 13). Bien qu’aucune datation radiométrique ne soit encore disponible, les assemblages de macro- et micro-mammifères, la présence de Pliomys coronensis et le changement climatique déduit de la variation dans la fréquence de micromammifères permettent de corréler les deux unités stratigraphiques 13 et 14 de Ciota Ciara à un épisode relativement tempéré du stade isotopique 5
GROTTA DEI SANTI, MONTE ARGENTARIO (GR); THE SMALL MAMMALS OF THE MOUSTERIAN LAYERS. A PRELIMINARY ASSESSMENT.
No full textThe genus Iberomys (CHALINE, 1972) (Rodentia, Arvicolinae, Mammalia) in the Pleistocene of Italy
No full textThe occurrence of the genus Iberomys is testified in Italy and the Iberian Peninsula from the Early Pleistocene on. The genus com- prises two extinct voles: I. huescarensis from the Early Pleistocene to the early Middle Pleistocene and I. brecciensis (=mediterraneus) from the Middle to the early Late Pleistocene. I. cabrerae, has been present in Spain from the early Late Pleistocene, enduring right through to today. The fossil record of Iberomys in Italy is poor in comparison with those in the Iberian Peninsula and southern France. I. huesca - rensis has been identified in Italy at the Rifreddo and Spessa sites, while I. brecciensis has been recognized at Zoppega 2, Montagnola Senese II, Isernia, Valdemino, Polledrara di Cecanibbio and Paglicci. A revision of the specimens of the genus Iberomys in Italy and a comparison with the fossil records of southern France and the Ibe - rian Peninsula show that the origin of the Early Pleistocene species (I. huescarensis) is clearly in the Iberian Peninsula, where the species having evolved from ancient populations of Allophaiomys nutiensis. The origin of the species I. brecciensis is still unknown. It seems to appear at the same time in Italy and in the Iberian Penin- sula, and its extinction occurred during the late Middle Pleistocene- early Late Pleistocene in Italy, France and Iberia simultaneously
Analysis of the Early Pleistocene small mammals from Pirro Nord 13 (Apricena, southern Italy) and their implications for reconstructing the palaeoenvironment of the early human occupation in Europe
No full textThe Pirro Nord quarry (Apricena, Foggia, southern Italy, 41◦48′6′′N, 15◦23′5′′ E) is a well-known palaeontological and archaeological locality comprising an abundant and diverse Early Pleistocene vertebrate assemblage of
mammals, birds, amphibians, and reptiles related to the Late Villafranchian and Early Biharian mammal ages. In
this study, we describe the small mammal assemblages (insectivores, rodents, and bats) excavated between 2010
and 2022 to reconstruct the palaeoenvironment surrounding the site using Habitat Weighting and the Bioclimatic
model methods. The rodent assemblage comprises mostly Allophaiomys cf. ruffoi, Apodemus sp., and Hystrix refossa, whereas Eliomys cf. intermedius was reported for the first time. Insectivores includes Talpa gr. minor-caeca; Asoriculus sp.; Erinaceus praeglacialis; and Sorex sp. Bats are represented by Rhinolophus ferrumequinum, Rhinolophus
gr. euryale-mehelyi, Myotis gr. myotis-blythii, Myotis sp., and Miniopterus schreibersii. Landscape reconstruction
attested to the presence of a rich and diverse environment with open areas and forest patches
surrounding the Pirro Nord 13 site. The climate was slightly colder than that of current times in the same area,
with higher precipitation. The presence of different ecosystems near the sites constituted suitable conditions for
the first human dispersion in Europe, as already revealed by evidence from Barranco Le ́on D, Atapuerca TE7–14,
and Fuente Nueva 3 elsewhere on the Iberian Peninsula. The study of small mammal assemblages improves our
understanding of the chronological boundaries of the human occupation of Pirro Nord 13, adding important
information in the context of the first peopling of the Mediterranean region between 1.6 and 1.3 million years ago
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