Search results for "Charophyte"
showing 10 items of 26 documents
Preliminary palaeontological data from the Loma Negra section (Bardenas Reales de Navarra, Lower-Middle Miocene)
2013
En este trabajo se da a conocer una nueva localidad fosilífera de la Formación Tudela (Navarra). Esta formación está compuesta por facies palustres, lacustres y aluviales distales, que representan el relleno del sector occidental- central de la Cuenca del Ebro durante el Rambliense y el Aragoniense (Mioceno inferior-medio). Basado en el estudio de los restos fósiles de micromamíferos, la nueva localidad fosilífera se sitúa bioestratigráficamente en la zona D del Aragoniense. Los datos paleoecológicos obtenidos de los micromamíferos indican que el ambiente debió ser húmedo y la temperatura templada. En lo que respecta a la zona palustre, los ostrácodos, carofitas y gasterópodos definirían un…
The role of charophytes in a Mediterranean pond created forrestoration purposes
2015
A small, shallow basin was created and flooded with groundwater in a Reserve Area in Albufera de València Natural Park (AVNP) under the scope of a restoration program intended to mimic typical environments such as freshwater springs, abundant in the past but currently suffering from deterioration (desiccation, pollution, etc.), with the ultimate goal of increasing local biodiversity of submerged macrophytes, particularly charophytes. In this study we have monitored, from April 2009 (a few months after its first flooding) to September 2012, the dynamics of charophyte growth and related physical, chemical and biotic variables to highlight the factors determining charophyte success. Just after…
The role of Characeae in the communities of the vegetation class Potametea
2018
The stonewort vegetation is commonly classified into the phytosociological class Charetea fragilis F. Fukarek ex Krausch 1964; however, the Characeae are not exclusively found in vegetation stands ascribed to this class but also in other habitat types. In our preliminary investigations, we draw the attention to the relationship between the classes Charetea fragilis and Potametea pectinati Klika in Klika & Novák 1941 in some Sicilian biotopes. In some cases, the Charetea vegetation is ecologically and spatially distinct, although close, from that referable to the Potametea. In some other cases, one or more species of Characeae are structurally intrinsic to the vegetation of Potametea: on…
The role of herbaria for taxonomic and distributional studies in Characeae: examples from the Herbarium Mediterraneum Panormitanum (PAL) and the Flor…
2018
Characeae is a taxonomically critical family. Taxonomical uncertainties inevitably affect its distributional data. The role of herbarium specimens, particularly types and original material, is crucial for unravelling taxonomical ‘knots’. Moreover, wet areas have undergone dramatic reduction and modification in the last century and historical herbarium specimens may represent basic documents for the reconstruction of former distributions. Some preliminary data from two different Italian Herbaria are here presented. The Herbarium Mediterraneum Panormitanum (PAL, the standard acronym according to the Index herbariorum, http://sweetgum.nybg.org/ ih) houses four folders of Characeae exsiccata. T…
New findings for the charophyte flora of Sicily (Italy)
2022
Food Sources for Benthic Grazers in Trophic Networks of Macrophyte Habitats in a Transitional Baltic Ecosystem
2022
In this study, we provide insights into that characteristics of two sites representing different conditions of productivity and salinity impact on trophic network structures of macrophyte habitats and diet of benthic grazers at the active vegetation period in the Curonian Lagoon (southeastern Baltic Sea). Regarding the epiphytic growth, macrophytes were more overgrown in the relatively less productive (northern) site with a muddy bottom and more frequent marine water inflow than in the (southern) site with higher productivity and freshwater sandy habitat. Stable isotope analysis revealed that organisms’ samples from the northern site were more enriched with the heavier carbon isotopes, but …
Aspects fonctionnels, structuraux et évolutifs de la réponse transcriptionnelle à l’auxine
2017
Auxin is a plant hormone implicated in almost all plant developmental stages, since the embryo formation till flowering, determining the position of the organs in the plant and thus, its whole structure. As for any other hormone, auxin perception is followed by a signal transduction that finishes in a series of changes in a plant cell, including transcriptional changes. This thesis is divided in 3 chapters, each with a focus on the structural, molecular and evolutionary aspects of different proteins involved in the regulation of auxin genes response.First, we focused our studies on TOPLESS (TPL), a co-repressor implicated, not only in auxin responsive genes repression, but also in many othe…
Dataset: Sexual reproductive phenology of three charophyte species from two Mediterranean brackish shallow ponds
2017
Esta base de datos contiene dos años de datos sobre la fenología reproductiva de tres especies de carófitos (Chara hispida, Chara aspera y Nitella hyalina) que crecen en distintas condiciones de profundidad y salinidad en dos charcas mediterráneas (someras y de agua salobre). La primera hoja de cálculo contiene todos los metadatos. De la segunda a la séptima hoja, se muestran los datos en bruto de cada población. De la octava a la decimotercera hoja, se muestran los datos agrupados y transformados de cada población. En la última hoja, se muestran las variables ambientales y fenológicas correspondientes a una población. Puede encontrarse más información sobre la adquisición, el análisis y la…
Macrophytes in Inland Waters: From Knowledge to Management
2023
The huge biodiversity of inland waters and the many different aquatic habitats or ecosystems occurring there are particularly threatened by human impacts. In this Special Issue, ten articles have been collected that show new data on the distribution and ecology of some rare aquatic macrophytes, including both vascular plants and charophytes, but also on the use of these organisms for the monitoring, management, and restoration of wetlands.
Time and heat for sexual reproduction: comparing the phenology of Chara hispida of two populations at different latitudes
2017
Abstract Geographical location affects the main ecological factors driving the timing of plants’ life events. In addition, studying phenology is the simplest procedure to track current global warming and its effects on the success and survival of different populations of the same species. Little is known about the effect of water temperature and its corresponding accumulated heat on charophytes’ phenology. We compared differences in water temperature and sexual reproductive phenology of Chara hispida in two ponds of two countries located at different latitudes (Spain and Switzerland) over the same year. We estimated the accumulated heat required to develop from one phenophase to another (un…