00601nas a2200145   4500008004100000245006600041210006500107260001200172300001400184490000700198520010000205100001800305700001600323856011600339       1991                        eng d00aIsoetes prototypus, a new diploid species from eastern Canada0 aIsoetes prototypus a new diploid species from eastern Canada  c1991///  a277 - 2810 v693 aThe species is found deep (±2 m) in cool lakes in New Brunswick and Nova Scotia. -from Authors1 aBritton, D.M.1 aGoltz, J.P.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0026014413&partnerID=40&md5=adb4c7e4d89bfcecdf225220a8e1cda202274nas 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=21fe17f142d72d406f9d3d8ae86bf65d