73 research outputs found
The lower pleistocene succession
ItVengono esposti aspetti stratigrafici e paleontologici di una successione calcarenitico-sabbioso-argillosa spessa 4,1 m, affiorante in Contrada Torsano (Nardò, provincia di Lecce), caratterizzata da livelli fossiliferi a molluschi, scafopodi, brachiopodi e coralli tra cui prevalgono Venus verrucosa, V. casina, Acanthocardia tuberculata, Aequipecten opercularis, Glossus humanus, Thracia convexa, Neopycnodonte cochlear, Pecten jacobaeus, Terebratula scillae, Dentalium rectum e Flabellum sp.; sono altresĂŹ presenti gli "ospiti nordici" Pseudamussium septemradiatum, Paphia rhomboides e soprattuto Arctica islandica. Questâultima è rappresentata da individui di grande taglia analogamente a popolamenti nordatlantici attuali (KENNISH and LUTZ, 1995; THORARINSDOTTIR and EINARSSON, 1996). I livelli fossiliferi (shell concentrations sensu KIDWELL, 1991; FĂRSICH, 1995) hanno caratteri di deposito primario e possono rappresentare il prodotto di strategie di adattamento o di favorevoli condizioni ecologiche.La maggior parte delle specie riconosciute nella successione di Torsano è attualmente presente nel Mediterraneo (PARENZAN, 1970; 1974; 1976; DEMIR, 2003; REPETTO et al., 2005). Alcune sono indicative di particolari condizioni ambientali come Lucinoma boreale, tipica di fondali mobili (MALATESTA, 1974) e Thracia convexa, esclusiva delle Biocenosi dei fanghi Terrigeni Costieri (PICARD, 1965; PĂRĂS, 1967).In generale, dalla base al tetto della successione analizzata, è definibile un cambiamento delle condizioni paleoambientali dalla zona infralitorale, soggetta a fenomeni di abrasione meccanica delle onde, a quella circalitorale per progressivi aumenti delle profonditĂ del fondale e della torbiditĂ delle acque.EnThis paper deals with the stratigraphic and paleontological features of a 4.1 m thick succession outcropping at Contrada Torsano (Nardò, Lecce province). Shell concentration due to biological processes, particularly rich in the northern guests Arctica islandica, Pseudamussium septemradiatum and Paphia rhomboides are described. Based on Terebratula scillae and Dentalium rectum presences, the succession must be attributed to the lower Pleistocene. The high specimen density could be due to opportunistic life strategies and optimal ecological conditions. Environmental change can be recognized from the infralittoral zone, exposed to the marine abrasion, to circalittoral zone as the result of the increasing of both depth and sea water turbidity
The lower pleistocene succession
ItVengono esposti aspetti stratigrafici e paleontologici di una successione calcarenitico-sabbioso-argillosa spessa 4,1 m, affiorante in Contrada Torsano (Nardò, provincia di Lecce), caratterizzata da livelli fossiliferi a molluschi, scafopodi, brachiopodi e coralli tra cui prevalgono Venus verrucosa, V. casina, Acanthocardia tuberculata, Aequipecten opercularis, Glossus humanus, Thracia convexa, Neopycnodonte cochlear, Pecten jacobaeus, Terebratula scillae, Dentalium rectum e Flabellum sp.; sono altresĂŹ presenti gli "ospiti nordici" Pseudamussium septemradiatum, Paphia rhomboides e soprattuto Arctica islandica. Questâultima è rappresentata da individui di grande taglia analogamente a popolamenti nordatlantici attuali (KENNISH and LUTZ, 1995; THORARINSDOTTIR and EINARSSON, 1996). I livelli fossiliferi (shell concentrations sensu KIDWELL, 1991; FĂRSICH, 1995) hanno caratteri di deposito primario e possono rappresentare il prodotto di strategie di adattamento o di favorevoli condizioni ecologiche.La maggior parte delle specie riconosciute nella successione di Torsano è attualmente presente nel Mediterraneo (PARENZAN, 1970; 1974; 1976; DEMIR, 2003; REPETTO et al., 2005). Alcune sono indicative di particolari condizioni ambientali come Lucinoma boreale, tipica di fondali mobili (MALATESTA, 1974) e Thracia convexa, esclusiva delle Biocenosi dei fanghi Terrigeni Costieri (PICARD, 1965; PĂRĂS, 1967).In generale, dalla base al tetto della successione analizzata, è definibile un cambiamento delle condizioni paleoambientali dalla zona infralitorale, soggetta a fenomeni di abrasione meccanica delle onde, a quella circalitorale per progressivi aumenti delle profonditĂ del fondale e della torbiditĂ delle acque.EnThis paper deals with the stratigraphic and paleontological features of a 4.1 m thick succession outcropping at Contrada Torsano (Nardò, Lecce province). Shell concentration due to biological processes, particularly rich in the northern guests Arctica islandica, Pseudamussium septemradiatum and Paphia rhomboides are described. Based on Terebratula scillae and Dentalium rectum presences, the succession must be attributed to the lower Pleistocene. The high specimen density could be due to opportunistic life strategies and optimal ecological conditions. Environmental change can be recognized from the infralittoral zone, exposed to the marine abrasion, to circalittoral zone as the result of the increasing of both depth and sea water turbidity
Serapias X Marchiorii Turco & Medagli (Serapias Bergonii E. G. Camus X Serapias Politisi Renz) Ibrido naturale nuovo del Salento
EnNatural hybridization in the plant kingdom, that particularly occurs in disturbed habitats where is generally considered as a threat for rare and endangered species, is a potent evolutionary force. In fact in Mediterranean orchids, mainly pertaining to the Anacamptys, Ophrys and Serapias genres, the hybridization is a common phenomenon, as a natural consequence of their pollination system, that often it has carried to the defined phenomenon âsympatric speciationâ. Here we describe the result of this process as a new Orchidaceaeâs hybryd species, belong to Serapias genus, named Serapias x marchiorii Turco & Medagli, through analysis of the morphological aspects. The parental of the new hybrid species are: Serapias bergonii E.G. Camus and Serapias politisi Renz. Serapias bergonii = S. vomeracea (N.L. Burm.) Briq. subsp. laxiflora (Soò) GĂślz & Reinhard was originally described as an hybrid entity, result of a discovery made in CorfĂš at the âSaline of Potamosâ. It is a species that is distributed in eastern areas, present in Italy only in the southern Apulia and southern Sicily. Serapias politisi, instead, was originally described as an hybrid between Serapias bergonii and Serapias parviflora at the island of CorfĂš, then was defined as a species and reported for the mainland Greece, the Aegeanâs islands, the western Anatolia and in Apulia, the only Italian region of presence, where it is widespread mostly in Salento. Thus, the ranges of these two entities have little overlap that make rare and localized the interspecific hybrids. This is, probably, the reason that makes the hybrid in question not widely distributed. S. x marchiorii was found in a small area known as âPalude di Cassanoâ in the town of Melendugno (Le) along the adriatic coast, May 13, 2009. The area of small dimensions, is occupied mostly by a depression in karst nature which was partially drained in the middle of â900 with the creation of a drainage channel; the area surrounding the marsh is mainly occupied by grasslands and maquis. The station was found with few plants and was situated at an altitude between 12 and 15m above sea level, on a calcareous substrates known as âCalcareniti del Salentoâ
Osservazioni e considerazioni su alcune specie costiere rupicole del Salento
ItGli autori riportano osservazioni e considerazioni riguardanti alcune specie delle coste rocciose del Salento meridionale.EnThe authors report observations and considerations concerning some species situated on the rocky coast of southern Salento
Evidence from multivariate morphometric study of the quercus pubescens complex in southeast Italy
The name Quercus pubescens s.l. encompasses a complex of deciduous oak taxa with mainly southeastEuropean
distribution and a large ecological niche. As the easternmost region of Italy, Apulia is
rather isolated from a geographical and physiographical viewpoint and counts the highest number
of oak species (10). In the taxonomic and phytosociological literature, the occurrence of several
species belonging to the Quercus pubescens collective group is reported for this region. In order to
verify if different sets of morphological characters are associated with different taxa, 24 populations
of Quercus pubescens s.l. located in different ecological-geographical areas of Apulia were sampled.
A total of 367 trees, 4254 leaves and 1120 fruits were collected and morphologically analysed.
Overall, 25 morphological characters of oak leaves and fruits were statistically treated using both
univariate and multivariate analysis. Nested ANOVA showed that leaves collected from a single tree
exhibited a degree of morphological variability higher than that observed when comparing leaves
coming from different trees of the same population and from different trees of different populations
as well. Almost all the morphological characters analysed exhibited a continuous trend of variation
so that none of them can be used as a character to discriminate between populations. Only leaf
and fruit âsizeâ and fruit petiole length emerged as slightly discriminating characters. Our results
suggest that it is unlikely that more than one species belonging to the Quercus pubescens complex
occurs in the Apulia region. Comparison between the Apulian populations and a genetically
pure Q. pubescens population coming from a different area (the Molise region) strengthened the
assumption as to the existence of a single species that can provisionally be classified under the name
of Q. pubescens s.
Orchidaceae in Puglia (Italy): Consistency, Distribution, and Conservation
A study of the distribution of orchid species in Puglia, based on an analysis of 2084 bibliographic reports from 2000 to 2022, was carried out with the aim of revising and updating the information on the consistency of the Orchidaceae family in Puglia, with a special focus on assessing threatened species occurring inside and outside protected areas. The work presents a checklist of the Orchidaceae taxa (genera, species, and subspecies) found in the region, including observations on genera and species that present taxonomic challenges. A total of 113 taxa (i.e., species and subspecies), distributed across 16 genera, are listed in alphabetical order. The most representative genera were Ophrys (51 taxa), Serapias (15 taxa), and Epipactis (11 taxa). Additionally, 49 taxa (43.4%) were found to be endemic to Italy, with 21 of these, mostly belonging to the Ophrys genus, being exclusive to Puglia. Our study notes two different trends of distribution: a predominantly coastal distribution for orchid records located in southern Puglia (the Salento peninsula) and a more widespread distribution for the other provinces. Our study also shows that the greatest number of records locate orchids in protected areas with a positive correlation between their presence and habitats cited in Directive 92/43/EEC
ďťżComparative chromosome studies in species of subtribe Orchidinae (Orchidaceae)
In our study, FISH mapping using 18S-5.8S-25S rDNA and 5S rDNA sequences was performed for the first time on Ophrys tenthredinifera Willdenow, 1805, Serapias vomeracea (Burman f., 1770) Briquet, 1910 and Himantoglossum hircinum (Linnaeus, 1753) Sprengel, 1826. A detailed study was also performed on O. tenthredinifera using Giemsa-staining, silver-staining, CMA fluorescence banding and fluorescence in situ hybridisation (FISH) with rDNA probes. We analysed two subspecies, i.e. O. tenthredinifera subsp. neglecta (Parlatore, 1860) E.G. Camus, 1908 and O. tenthredinifera subsp. grandiflora (Tenore, 1819) Kreutz, 2004 by the traditional Feulgen method and constructed the karyotype. The cytotaxonomic implications for both taxa are also discussed. In Himantoglossum hircinum, FISH and silver staining highlighted differences in the number of two rDNA families (35S and 5S) with respect to Barlia robertiana (Loiseleur-Deslongchamps, 1807) Greuter, 1967. In addition, fluorescence in situ hybridisation was also applied to diploid (2n = 2x = 36) and triploid (2n = 3x = 54) Anacamptis morio (Linnaeus, 1753) R.M. Bateman, Pridgeon et M.W. Chase, 1997. As far as we are aware, this is the first case of autotriploidy observed in A. morio
Presenza di Ostrya carpinifolia Scop. e di Quercus trojana Webb lungo la piana costiera brindisina
ItGli autori riferiscono del ritrovamento di Ostrya carpinifolia Scop. e di Quercus trojana Webb lungo la costa della provincia di Brindisi.EnAbout the presence of Ostrya carpinifolia Scop. and Quercus trojana Webb along the coastal plain of the province of Brindisi-The authors report about the finding of Ostrya carpinifolia Scop. and Quercus trojana Webb along the coast of the province of Brindisi
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