trié(s) par (Pertinence décroissant(e), Titre croissant(e)) 

Habitat conditions of the phytocoenoses dominated by Luronium natans (L.) Rafin in Poland / Marcin Szankowski in Hydrobiologia, vol. 455 (Année 2001)

Public [article]  inHydrobiologia > vol. 455 (Année 2001) . - pp. 213-222 Titre : Habitat conditions of the phytocoenoses dominated by Luronium natans (L.) Rafin in Poland Auteurs : Marcin Szankowski, Auteur ; Stanislaw Klosowski, Auteur Année de publication : 2001 Article en page(s) : pp. 213-222 Langues : Anglais (eng) Catégories : [ZG] Pologne [Espèces (in biblio)] Isoëtes lacustris [Espèces (in biblio)] Lobelia dortmanna [Espèces (in biblio)] Luronium natans Mots-clés : communauté végétale  phytosociologie  phytocénose Résumé : "Phytosociological and habitat studies of the phytocoenoses of Luronium natans have been conducted. The present results were compared with data on L. dortmanna and I. lacustris. It is demonstrated that the community of L. natans differs from the other two communities with respect to habitat conditions despite the fact that they have been reported to occur jointly and alongside in Lobelia lakes. It appears that significant differences between the communities are found not only regarding their waters, but also their substrates. L. natans dominated phytocoenoses are confined to oligotrophic, extremely soft waters, markedly poor in Ca2+, but richer in Na+ and SO4 2- than those of Lobelia and Isoëtes. Luronium natans develops best on acidic, highly hydrated substrates rich in organic matter, NO3 − and total N. The results obtained indicate that L. natans and the phytocoenoses formed by it are characterized by their narrow ecological amplitude in Poland as opposed to those occurring in western Europe, which tolerate a relatively wide range of habitats. The present findings confirm the data from numerous works, which point to the weak competitive ability of the species compared with species typical of eutrophic waters." (source : auteurs) Type de publication : périodique Référence biblio : Szankowski M., Klosowski S., 2001 - Habitat conditions of the phytocoenoses dominated by Luronium natans (L.) Rafin in Poland. Hydrobiologia, 455 : 213-222. ID PMB : 72260 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=72260 [article]

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Influence of water level fluctuation on the structure and composition of the macrophyte vegetation in two small temporary lakes in the northwest of Spain / Camino Fernández-Aláez in Hydrobiologia, vol. 415, n°0 (Année 1999)

Public [article]  inHydrobiologia > vol. 415, n°0 (Année 1999) . - pp. 155-162 Titre : Influence of water level fluctuation on the structure and composition of the macrophyte vegetation in two small temporary lakes in the northwest of Spain Type de document : texte imprimé Auteurs : Camino Fernández-Aláez, Auteur ; Margarita Fernández-Aláez, Auteur ; Eloy Bécares, Auteur Année de publication : 1999 Article en page(s) : pp. 155-162 Langues : Multilingue (mul) Catégories : [ZG] Espagne [habitats/milieux] 2 - Milieux aquatiques non marins Mots-clés : macrophyte  phénologie  zonage Résumé : "The influence of water retention time and depth variation on the macrophyte community in two small shallow lakes in the northwest of Spain was studied. One lake is periodically flooded and the other deeper lake, which is usually inundated, dries up sporadically. The influence of water regime and the spatial heterogeneity of the abiotic environment on diversity values and their temporal evolution are shown. For each lake, a model of horizontal arrangement of species is established. A differential arrangement of optima for dominant species was observed along the depth gradient. This arrangement remained constant in time." (source : auteurs) Type de publication : périodique Référence biblio : Fernández-Aláez C., Fernández-Aláez M., Bécares E., 1999 - Influence of water level fluctuation on the structure and composition of the macrophyte vegetation in two small temporary lakes in the northwest of Spain. Hydrobiologia, 415 (0) : 155-162. ID PMB : 65395 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65395 [article]

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Relationship between freshwater gastropods and plant communities reflecting various trophic levels / Katherine Costil in Hydrobiologia, vol. 321 (Année 1996)

Public [article]  inHydrobiologia > vol. 321 (Année 1996) . - pp. 7-16 Titre : Relationship between freshwater gastropods and plant communities reflecting various trophic levels Type de document : texte imprimé Auteurs : Katherine Costil, Auteur ; Bernard Clément, Auteur Année de publication : 1996 Article en page(s) : pp. 7-16 Langues : Anglais (eng) Catégories : [ZG] BRETAGNE (53) [habitats/milieux] 2 - Milieux aquatiques non marins [habitats/milieux] ZH - Zones humides Mots-clés : communauté végétale  gastéropode Résumé : "Plant communities were examined in ponds in Brittany (north-west France) and then classified into six types reflecting different trophic levels: oligotrophic, oligodystrophic, mesotrophic, meso-dystrophic, meso-eutrophic an eutrophic. In 45 of these ponds, aquatic snails were sampled in order to determine the relationship between the gastropod species richness and the water trophic levels as indicated by plant community types. The second aim of this study was to determine whether some gastropod species were characteristic of a particular trophic level. The number of plant communities in the ponds was also taken into consideration. A trophic gradient was found along the F1 axis on the principal plane of the correspondence analyses. The species richnesses low or zero and especially the lymneid, Lymnaea glabra were close to the oligo-dystrophic and oligotrophic communities. In contrast, the highest numbers of snail species (5 and above) were found in the most eutrophic ponds where Hippeutis complanatus, Planorbis planorbis, Lymnaea stagnalis and Planorbarius corneus were particularly common. The latter species inhabited the ponds including on average the greatest number of macrophyte communities but no significant differences were found between snail species. The ponds which contained the greatest numbers of plant communities included the richest gastropod communities (7 and more) but also the poorest ones (0 or 1 species). Relationships between freshwater snails, macrophytes and trophic levels are discussed." (source : auteurs) Type de publication : périodique Référence biblio : Costil K., Clément B., 1996 - Relationship between freshwater gastropods and plant communities reflecting various trophic levels. Hydrobiologia, 321 : 7-16. ID PMB : 71309 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71309 [article]

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Seed bank of Littorella uniflora (L.) Asch. in the Czech Republic, Central Europe : does burial depth and sediment type influence seed germination? / Jan Kolar in Hydrobiologia, vol. 794 (Année 2017)

Public [article]  inHydrobiologia > vol. 794 (Année 2017) . - pp. 347-358 Titre : Seed bank of Littorella uniflora (L.) Asch. in the Czech Republic, Central Europe : does burial depth and sediment type influence seed germination? Type de document : texte imprimé Auteurs : Jan Kolar, Auteur ; Andrea Kucerova, Auteur ; Pavel Jakubec, Auteur ; Jan Vymazal, Auteur Année de publication : 2017 Article en page(s) : pp. 347-358 Langues : Anglais (eng) Catégories : [ZG] République tchèque Use for events after 1992. [Espèces (in biblio)] Littorella uniflora [Thèmes] Banque de graines [Thèmes] Conservation [Thèmes] Germination des graines [Thèmes] Plante aquatique Résumé : "Littorella uniflora (Plantaginaceae) is a scarce and declining aquatic plant in Europe. Its population has been strongly reduced by changes in fishpond management (eutrophication) in the Czech Republic since the 1950s. We studied its seed bank in both recent (n = 8) and historical localities (the last found from 1972 to 2000; n = 10) and tested the effects of sediment type and burial depth on seed germination using extracted seeds from two recent populations. The seeds were found in 60% of the historical localities, mostly in low densities (≤6 seeds per 3.75 l of sediment), and also in 100% of the recent localities in various densities (8–1390 seeds per 3.75 l of sediment); however, low germination rates (0–13.3%) were estimated. The seeds germinated best on wet filter paper, followed by nutrient-rich fishpond sediment, but poorly on sand mixed with different substrates. Burial depth significantly affected seed germination. The seeds germinated only on the soil surface and at the depth of 1 cm but no seed germinated at the depth of 3 and 5 cm. Besides low water transparency, both high rate of sediment accumulation and the absence of summer drainage may endanger L. uniflora populations in fishponds." (source : auteurs) Type de publication : périodique Référence biblio : Kolar J., Kucerova A., Jakubec P., Vymazal J., 2017 - Seed bank of Littorella uniflora (L.) Asch. in the Czech Republic, Central Europe : does burial depth and sediment type influence seed germination? Hydrobiologia, 794 : 347-358. ID PMB : 71775 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71775 [article]

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Seed regeneration in Mediterranean temporary ponds: germination ecophysiology and vegetation processes / Angelino Carta in Hydrobiologia, vol. 782 (Année 2016)

Public [article]  inHydrobiologia > vol. 782 (Année 2016) . - pp. 23-35 Titre : Seed regeneration in Mediterranean temporary ponds: germination ecophysiology and vegetation processes Type de document : texte imprimé Auteurs : Angelino Carta, Auteur Année de publication : 2016 Article en page(s) : pp. 23-35 Langues : Anglais (eng) Catégories : [habitats/milieux] 2 - Milieux aquatiques non marins [habitats/milieux] ZH - Zones humides [Thèmes] Banque de graines [Thèmes] Banque de graines du sol [Thèmes] Dormance des graines [Thèmes] Germination des graines Résumé : "Mediterranean temporary ponds (MTPs) are very specialised and threatened habitats found in Mediterranean-like bioclimates worldwide. MTPs have received considerable attention over the past years because of the multiple ecological roles they play in the landscape. Nevertheless, seed germination, dormancy, and desiccation tolerance of species living in MTPs are poorly investigated. Here, we reviewed these topics and found that seed germination data exist for only 48 species. While dormancy differs among the species, germination mostly depends on cool temperatures (<15°C) which are associated with the main rainfall season and on the light triggering germination in seeds located close to the soil surface and resulting in the persistence of buried seeds until disturbances occur. Most species seem amenable to seed banking as a means of ex situ conservation but a worldwide comparative study is required to better understand seed lifespan in MTPs. In general, these species exhibit a Mediterranean germination syndrome and plastic germination response that is typical of neither truly aquatic nor wetland plants. The importance of conducting ecologically meaningful germination studies, including germination experiments conducted in the field has been highlighted to gain further insights into the dynamic processes in the vegetation and to test for convergent evolution." (source : auteur) Type de publication : périodique Référence biblio : Carta A., 2016 - Seed regeneration in Mediterranean temporary ponds: germination ecophysiology and vegetation processes. Hydrobiologia, 782 : 23-35. ID PMB : 70792 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=70792 [article]

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Succession of Egeria densa in a drinking water reservoir in Morbihan (France) / Alain Dutartre in Hydrobiologia, vol. 415, n°0 (Année 1999)

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