02274nas a2200217   4500008004100000245012200041210007000163260001200233300001300245490000700258520145500265653003901720653002301759653002601782653002101808653005201829653002301881653002001904100001601924856011601940       1991                        eng d00aOn the phytosociology and ecology of Isoëtes asiatica (Makino) Makino in oligotrophic water bodies of South Sakhalin0 aphytosociology and ecology of Isoëtes asiatica Makino Makino in   c1991///  a99 - 1150 v973 aIn 1989, in the southeast of the Sakhalin Island and south of the village Okhotskoye, Isoëtes asiatica (Makino) Makino and I. beringensis Kom. were detected in 24 oligotrophic lakes for the first time on Sakhalin. These are stands of the community of Isoëtetum asiaticae ass. nov. which in the majority of the lakes form a characteristic pioneer vegetation of the shallow littoral zones. In addition to poor-species dominance stands of both of the Isoëtes species, penetration stages of both of these species as well as stages rich in Comarum palustre, Eleocharis acicularis and Potamogeton species can be differentiated. Besides the structure of the species, the site conditions, particularly of the water bodies are described. The ion content is represented by absolute and relative ion field diagrams exemplified by 7 selected water bodies. The ion content is characterized by sodium and chloride which are prevailing, while calcium and magnesium as well as hydrogen carbonate and sulphate exist in low quantitative proportions only. The indicator values of individual characteristics and the complex characteristics of the Isoëtes lakes are discussed. The hydrochemical characteristics of the Sakhalin, Kuriles and Kamchatka Isoëtes waters are compared with the Isoëtes water bodies of North America and Europe. The danger to Isoëtes water bodies is discussed, necessary protective measures are defined. © 1991 Kluwer Academic Publishers.10aAbsolute and relative ion diagrams10aEndangered species10aFloristical structure10aIndicator values10aIsoëtes asiatica and I. beringensis vegetation10aOligotrophic lakes10aSakhalin Island1 aPietsch, W.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0026350315&partnerID=40&md5=21fe17f142d72d406f9d3d8ae86bf65d02275nas a2200289   4500008004100000245011600041210006900157260001200226300001400238490000800252520133300260653002301593653002301616653001201639653002001651653002001671653001801691653003301709653002401742653001501766653002201781100001401803700001601817700002001833700001601853856011601869       2004                        eng d00aExperimental management of Mediterranean temporary pools for conservation of the rare quillwort Isoetes setacea0 aExperimental management of Mediterranean temporary pools for con  c2004///  a675 - 6840 v1183 aMediterranean temporary pools represent unique species-rich habitats with many rare and endangered species. The Roque-Haute Natural Reserve is one of the few sites in France with Isoetes setacea Lam., a very rare Mediterranean quillwort, considered as a keystone species determining a priority habitat for the European Union. Land uses changes have favoured the invasion of the pools by several shrub and tree species (e.g., Ulmus minor, Fraxinus angustifolia subsp. oxycarpa). Clearing shrubs in an experimental area of one pool resulted in the increase of I. setacea as compared to control, combining a higher cover in previously occupied quadrats and more quadrats occupied. Litter accumulation had a negative effect on the population of Isoetes but this effect was detectable only in the cleared area. Light attenuation was shown experimentally to be detrimental to the vegetative and regenerative production of I. setacea. Clearing of the shrubs and removal of the litter led to an increase in the I. setacea populations and therefore appears to be an effective technique for restoring these plant communities invaded by shrubs. Long-term shrub control should be ensured by reintroducing sheep grazing in order to enhance the sustainable conservation of this oligotrophic habitat. © 2003 Elsevier Ltd. All rights reserved.10aArtificial shading10aEndangered species10aGrazing10aIsoetes setacea10aLight reduction10aLitter effect10aMediterranean seasonal pools10aSexual reproduction10aSpore-bank10aVegetative growth1 aRhazi, M.1 aGrillas, P.1 aCharpentier, A.1 aMédail, F.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-2042522718&partnerID=40&md5=9b3e2127f0abc60df6e5407fa4e555ec02363nas a2200229   4500008004100000245010400041210006900145260001200214300001200226490000700238520157200245653002501817653002301842653004501865653002501910653002201935100001501957700001501972700001301987700001602000856011702016       2009                        eng d00aPreliminary study on community characteristics of Isoetes orientalis at different succession stages0 aPreliminary study on community characteristics of Isoetes orient  c2009///  a22 - 270 v183 aComparative analyses of species composition, community ecological quantitative characteristics, species diversity and propogation mode of Isoëtes orientalis H. Liu et Q. F. Wang communities at different succession stages were conducted by the method of space-replacing-time. The results show that at early succession stage, the community has the lowest diversity ( species richness, Shannon-Wiener index, Pielou evenness index and β diversity index) , and the abundance, coverage, important value and niche breadth of I. orientalis population are the highest, which makes I. orientalis the dominant species. At middle succession stage, the abundance, coverage, important value and niche breadth of I. orientalis population all decrease, while the community shows the highest species diversity, which makes the climax community of I, orientalis. At late succession stage, the abundance, coverage, important value and niche breadth of I. orientalis population fall to the lowest levels, and perennial herbs such as Miscanthus sinensis Anderss. and Zizania latifolia ( Griseb.) Turcz. ex Stapf become dominant species. Along with the succession process, the number of species adopting asexual/vegetative propogation increases and the main propogation strategy of the community changes from sexual propogation to asexual/vegetative propogation. It is suggested that in the process of succession, the changes of species composition, species diversity, propogation strategy of species and mesophytic habitat may be the major reason to decline of I. orientalis population.10aCommunity succession10aEndangered species10aIsoëtes orientalis H. Liu et Q. F. Wang10aPropogation strategy10aSpecies diversity1 aZhu, S.-C.1 aZhu, W.-J.1 aChen, X.1 aTang, J.-J.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-67651120104&partnerID=40&md5=abd46b2e9745329f95cfe24ddc9298c3