174 research outputs found
España. Mapas físicos. 1834 (1827). 1:2525250
Escala gráfica, además en : '30 lieues marines de 25 au degré ; 20 lieues portugaises de 17 1/2 au degré'. Coordenadas : E05 00'-E22 50'/N44 30'-N35 00'. Meridiano de FerroRelieve : sombreadoInserta leyenda alfabética de los accidentes geográficos representa
Guide du voyageur en Espagne
Materia: Recoge información relativa a Euskadi y Navarra (p. 338-343 y 624-633)Digitalización. Vitoria-Gasteiz : Fundación Sancho el Sabio, 2008Carton
España. Mapas generales. 1834 (1827). 1:2525250
Escala gráfica, además en : '30 lieues marines de 25 au degré ; 20 lieues portugaises de 17 1/2 au degré'. Coordenadas : E05 00'-E22 50'/N44 30'-N35 00'. Meridiano de FerroInserta leyenda con los signos de las materias del map
The genera Melanothamnus Bornet & Falkenberg and Vertebrata S.F. Gray constitute well-defined clades of the red algal tribe Polysiphonieae (Rhodomelaceae, Ceramiales).
Polysiphonia is the largest genus of red algae, and several schemes subdividing it into smaller taxa have been proposed since its original description. Most of these proposals were not generally accepted, and currently the tribe Polysiphonieae consists of the large genus Polysiphonia (190 species), the segregate genus Neosiphonia (43 species), and 13 smaller genera (< 10 species each). In this paper, phylogenetic relationships of the tribe Polysiphonieae are analysed, with particular emphasis on the genera Carradoriella, Fernandosiphonia, Melanothamnus, Neosiphonia, Polysiphonia sensu stricto, Streblocladia and Vertebrata. We evaluated the consistency of 14 selected morphological characters in the identified clades. Based on molecular phylogenetic (rbcL and 18S genes) and morphological evidence, two speciose genera are recognized: Vertebrata (including the type species of the genera Ctenosiphonia, Enelittosiphonia, Boergeseniella and Brongniartella) and Melanothamnus (including the type species of the genera Fernandosiphonia and Neosiphonia). Both genera are distinguished from other members of the Polysiphonieae by synapomorphic characters, the emergence of which could have provided evolutionarily selective advantages for these two lineages. In Vertebrata trichoblast cells are multinucleate, possibly associated with the development of extraordinarily long, photoprotective, trichoblasts. Melanothamnus has 3-celled carpogonial branches and plastids lying exclusively on radial walls of the pericentral cells, which similarly may improve resistance to damage caused by excessive light. Other relevant characters that are constant in each genus are also shared with other clades. The evolutionary origin of the genera Melanothamnus and Vertebrata is estimated as 75.7-95.78 and 90.7-138.66 Ma, respectively. Despite arising in the Cretaceous, before the closure of the Tethys Seaway, Melanothamnus is a predominantly Indo-Pacific genus and its near-absence from the northeastern Atlantic is enigmatic. The nomenclatural implications of this work are that 46 species are here transferred to Melanothamnus, six species are transferred to Vertebrata and 13 names are resurrected for Vertebrata
Dictyotaceae (Dictyotales, Phaeophyceae) species from French Polynesia: current knowledge and future research
The coral reefs of French Polynesia (FP) have experienced repeated macroalgal blooms over the last decades. These events have prompted intense efforts in fundamental and applied research on macroalgae in this ecoregion, especially regarding species of the order Fucales (Turbinaria ornata and Sargassum pacificum). Recently, however, these proliferations have occurred with a higher frequency, and they now involve additional species. Specifically, over the past decade, the abundance of species belonging to the Dictyotaceae family (e.g., Dictyota bartayresiana and Spatoglossum asperum) has increased on coral reefs around Tahiti Island, the largest and most inhabited island in FP. On the course of evolution, these species have developed physical and chemical defenses to deter grazers, including the production of a wide array of specialized metabolites. These molecules are of particular interest for their promising biological activities as well as for the new Blue Economy opportunities they can offer to FP. We review the current state of knowledge on the diversity, ecology, and potential uses of Dictyotaceae species present in FP. The first section focuses on the diversity and distribution of the family Dictyotaceae in FP. The second part examines the ecological dynamics of Dictyotaceae species in the coral reef ecosystem and their response to various environmental factors. The third and final part reviews the metabolites known from Dictyotaceae species that are present in FP, their associated biological activities, and potential for the development of biotechnological applications in FP
Coralline Algae in a Changing Mediterranean Sea: How Can We Predict Their Future, if We Do Not Know Their Present?
In this review we assess the state of knowledge for the coralline algae of the
Mediterranean Sea, a group of calcareous seaweeds imperfectly known and considered
highly vulnerable to long-term climate change. Corallines have occurred in the
Mediterranean area for ∼140 My and are well-represented in the subsequent fossil
record; for some species currently common the fossil documentation dates back to
the Oligocene, with a major role in the sedimentary record of some areas. Some
Mediterranean corallines are key ecosystem engineers that produce or consolidate
biogenic habitats (e.g., coralligenous concretions, Lithophyllum byssoides rims, rims of
articulated corallines, maerl/rhodolith beds). Although bioconstructions built by corallines
exist virtually in every sea, in the Mediterranean they reach a particularly high spatial
and bathymetric extent (coralligenous concretions alone are estimated to exceed 2,700
km2 in surface). Overall, composition, dynamics and responses to human disturbances
of coralline-dominated communities have been well-studied; except for a few species,
however, the biology of Mediterranean corallines is poorly known. In terms of diversity,
60 species of corallines are currently reported from the Mediterranean. This number,
however, is based on morphological assessments and recent studies incorporating
molecular data suggest that the correct estimate is probably much higher. The responses
of Mediterranean corallines to climate change have been the subject of several recent
studies that documented their tolerance/sensitivity to elevated temperatures and pCO2.
These investigations have focused on a few species and should be extended to
a wider taxonomic set
Relation du voyage de la Commission Scientifique de Morée dans le Peloponnèse, les Cyclades et l'Attique.
Preface.Introduction.Dedication: S.M.La Reine des FrancaisIllustration: (Maps ,Views ,antiquities ,)Pagination: PP18+475P,PP4+496PVolumes: 2Text Genre:ProseIllustration: (χάρτες ,τοπία ,αρχαιότητες ,
Bory de St. Vincent May 13, [1856]
Start Page: 1End Page:
- …