Search results for "charophyte"

Selecting submerged macrophyte species for replanting in Mediterranean eutrophic wetlands

2020

Abstract The criteria to select submerged plant species for restoration still need further evaluations for a better understanding of their suitability prior to undertaking large plantings which represent a large effort in terms of economical and human resources. In this study, previously to the restoration of a eutrophic area (Tancat de la Pipa) within the Albufera de Valencia Natural Park, the growth of three submerged plants (Ceratophyllum demersum, Myriophyllum spicatum and Stuckenia pectinata), an amphibious species (Ranunculus sceleratus), and three charophytes species (Chara vulgaris, Tolypella glomerata and Nitella hyalina) has been evaluated under controlled laboratory conditions in…

Aproximación a las comunidades de carófitos que existieron en la albufera de valencia a partir del estudio de las oósporas del sedimento

2009

14 páginas, 8 figuras, 3 tablas.

Algunos aspectos de la variabilidad de los oogonios en poblaciones actuales del género <i>Chara</i> (Charophyceae). Aplicación paleontoló…

1986

A critical revision of some useful taxonomic criteria in paleontology of Charophytes is carried Out. The results are based in four modern populations ((<i>Chara aculeolata, Chara</i> aff.<i>baltica, Chara delicatula</i> and <i>Chara globularis</i>) and they permit to make some serious objections to these critera. The results are related with three principal aspects: the meaning of the absolute magnitudes of me girogonite, the behaviour of his joint variation and the morphological variability during the calcification process. In general, and for each one of the four populations, an absence of influence of the position of the girogonite over their measureme…

Chara hispida beds as a sink of nitrogen: Evidence from growth, nitrogen uptake and decomposition

2007

8 pages, and tables stadistics, and figures.

New records of Characeae for Sicily (Italy)

2018

During the last year, the first two authors continued their survey of the scarcely known Characeae flora of the island of Sicily: plants were collected in different periods, habitats and areas of the island, and identifications – made on fresh material – were based mainly on Mouronval et al. (2015). We had the opportunity to include here some results deriving from the visit in Sicily made by Klaus van de Weyer in March 2018. Roman Romanov identified some specimens and revised some identifications. Data for Sicily are basically limited to more than one hundred years old reports; data for the national Flora have been completed with recent reports for Sardinia (cf. the work made by Ralf Becker…

22nd Meeting of the Group of European Charophytologists (GEC), Palermo, Italy 17-21 September 2018, Programme & Abstracts

2018

Pre-Linnaean illustrations as original material of Linnaean Chara names (Characeae)

2018

Wood (1960) investigated about the types of the four names of Characeae published by Linnaeus (1753) in his Species Plantarum. He focussed on the herbarium specimens forgetting the images mentioned in the protologues. Here we list and present the pre-Linnaean illustrations that have to be considered “original material” (according to the International Code of Nomenclature) for the mentioned names. Chara tomentosa L. - Wood (1960) defined the specimen 1088.1 in the herbarium LINN as “holotype”, actually it is a lectotype (as well reported in The Linnaean Plant Name Typification Project, http://www.nhm.ac.uk/ our-science/data/linnaean-typification) because of the two different figures cited in…

Charophytes for description and monitoring of inland waters in Sicily

2017

The island of Sicily, in the center of the Mediterranean basin, is a well-known biodiversity hotspot (Médail & Quézel, 1997). Unfortunately, the knowledge of its charophyte flora is absolutely unsatisfactory. The few available data derive from some scattered phytosociological works and some articles published more than 100 years ago. According to the last national synthesis (Bazzichelli & Abdelahad, 2009) a total of 19 Charophytes species should occur in the island, distributed in 4 genera: Chara L. (11), Nitella Agardh (5), Tolypella (A. Braun) A. Braun (2) and Lamprothamnium J. Groves (1). However an updated list of the species occurring in the island, together with their distribu…

Effects of overabundant nitrate and warmer temperatures on charophytes: The roles of plasticity and local adaptation

2018

Global change effects, such as warming and increases in nitrogen loading, alter vulnerable Mediterranean aquatic systems, and charophytes can be one of the most affected groups. We addressed the possible interaction between these factors on two populations of the cosmopolitan charophytes Chara hispida and Chara vulgaris. Populations were taken from two different environments, a nitrate-poor mountain lake and a nitrate-rich Mediterranean coastal spring. The laboratory experiment had a 2 × 2 factorial design based on two nitrate levels (similar to and double the local conditions) and two temperatures. Increased temperatures favoured the growth of the four populations, but an increase in nitra…

Paleoenvironmental evolution of the Pliocene Villarroya Lake, northern Spain. A multidisciplinary approach

2002

The Pliocene Villarroya basin fill consists of lacustrine and alluvial deposits over 100 m thick. The lacustrine deposits, up to 30 m thick, comprise three sequences. The two lower sequences consist of profundal, laminated deposits formed by mostly terrigenous facies that are overlain by charophytic carbonates and varves. The uppermost, third sequence made up of massive bioturbated mudstones corresponds to a very shallow lacustrine-palustrine environment. Bulk mineralogy comprises carbonates, clay minerals, quartz and feldspars. The carbonates are: exogenic, biogenic calcite and biogenic aragonite. Biogenic calcite constitutes ostracod shells and charophyte stem encrustations, whereas arago…