Search results for "Marshes"
showing 8 items of 8 documents
Carbon metabolic rates and GHG emissions in different wetland types of the Ebro Delta
2020
Deltaic wetlands are highly productive ecosystems, which characteristically can act as C-sinks. However, they are among the most threatened ecosystems, being very vulnerable to global change, and require special attention towards its conservation. Knowing their climate change mitigating potential, conservation measures should also be oriented with a climatic approach, to strengthen their regulatory services. In this work we studied the carbon biogeochemistry and the specific relevance of certain microbial guilds on carbon metabolisms of the three main types of deltaic wetlands located in the Ebro Delta, north-eastern Spain, as well as how they deal with human pressures and climate change ef…
Antiguos puertos e islas en el litoral andaluz: cartografía, toponimia e historia
2003
Se trata de recordar y agradecer las enseñanzas del Dr. Rosselló y aplicarlas a las costas andaluzas, de cuyas variadas formas llaman la atención los procesos de aterramiento de la parte atlántica, donde hay lugares cuya situación actual no responde a su topónimo (Isla Cristina, San Juan del Puerto...). A estudios anteriores, añadimos noticias históricas y trazados de mapas, que señalan una rápida evolución, referido principalmente a tres ámbitos. La desembocadura del Guadiana, que pasa en época histórica de barras arenosas e islas a zonas cultivadas y urbanizaciones de playas; el antiguo estuario del río Piedras, con puertos aún en el XIX, que sustenta hoy marismas, naranjales y cultivos d…
Halophytic vegetation and adjoining plant communities in Middle Asia (Pamir-Alai and western Tian Shan)
2021
In this paper, we complete the syntaxonomical scheme for halophytic vegetation and adjoining plant communities of the lowland, montane and alpine zones in the Pamir-Alai and western Tian Shan in Tajikistan and Kyrgyzstan with some remarks on its environmental predictors. A total of 217 relevés were sampled in 2014–2019 using the seven-degree cover-abundance scale of the Braun-Blanquet approach. Modified TWlNSPAN was used to classify plant communities based on species composition. The cover-abundance scale was transformed using the four-step interval scale with cut-off levels at 0%, 5% and 25%. Diagnostic species were identified using the phi coefficient as a fidelity measure. Non-metric Mul…
Molecular markers indicate the phylogenetic identity of southern Brazilian sea asparagus: first record of Salicornia neei in Brazil
2019
Abstract Molecular phylogenetic analyses based on ETS, ITS and atpB - rbcL spacer sequences assessed the phylogenetic status of the southern Brazil sea asparagus species of the genus Salicornia (Salicornioideae, Amaranthaceae). Accessions of Patos Lagoon estuary (32° S) were obtained from wild plants and two pure line lineages, selected from contrasting prostrate (BTH1) and decumbent (BTH2) ecomorphotypes found locally. Patos Lagoon wild plants, BTH1 and BTH2 f4 progenies showed 100% identical sequences for the atpB - rbcL and ITS spacers, only two mutations for ETS. Comparison of the sequences of these three markers with GenBank records confirmed the identity of Brazilian accessions as Sal…
Assessing Effects of Temperature Change on Four Limonium Species from Threatened Mediterranean Salt-Affected Habitats
2018
[EN] Evaluation of tolerance to temperatures in the germination stage is an important tool to foresee the possible effect of global warming. Moreover, establishing germination protocols for endemic and threatened species is most interesting for restoration and management plans that focus on habitat conservation. Seed germination was analysed in four species of the genus Limonium (L. virgatum, L. narbonense, L. girardianum and L. santapolense) growing in two saline habitats on the eastern coast of the Iberian Peninsula. The study aim was to compare responses of seed germination to different temperature regimes. Seeds were collected in two protected areas, `L¿Albufera de Valencia¿ (province o…
Les minières de silex néolithiques des marais de Saint-Gond (Marne)
2014
In the southern and eastern area of the Côte d’Île-de-France, north of the marshes of Saint-Gond (Marne, France), research incorporating a great deal of unpublished documentation, and the results of pedestrian and aerial surveys, has highlighted five flint mines. For various reasons, the many indications of mining activity in this region have never been considered sufficient to consider it a mining area, however, the combination of a series of objective observations suggests the existence of five flint mines.In several sites, flint mining was conducted from shafts several metres deep, sometimes connected by galleries. As many archaeological discoveries made during the earlier excavations ha…
Anàlisi de les estratègies germinatives d’espècies halòfiles
2018
En ambients halòfils de clima mediterrani com els localitzats en el litoral sud alacantí, l’ecofisiologia de la germinació és afectada essencialment pel dèficit hídric estacional, les elevades temperatures i les propietats del sòl. En aquest marc d’irregularitat ambiental, s’establí la resposta de germinació integrada en el cicle vital de l’espècie herbàcia halòfita Mesembryanthemum nodiflorum L. per tal d’avançar en el coneixement del funcionament d’aquests ambients salins i així poder abordar futurs programes de conservació vegetal en praderies salines. El protocol de germinació òptim de l’espècie d’estudi s’aconsegueix a un rang tèrmic de 25/10ºC i un fotoperíode de 12/12 h llum/obscurit…
Minières, "ateliers" et hypogées. Étude de l’organisation du territoire dans les marais de Saint-Gond (Marne)
2013
National audience