@article {125,
	title = {Plant size and fertility of Isoetes lacustris L. in 20 lakes of Scandinavia: A field study},
	journal = {Archiv fur Hydrobiologie},
	volume = {139},
	year = {1997},
	note = {Cited By (since 1996):7Export Date: 11 November 2013Source: Scopus},
	month = {1997///},
	pages = {171 - 185},
	abstract = {A relationship between the individual size and fertility of Isoetes lacustris in the habitat centres of different lakes was found. The maximum (mean) rosette size was 202.2 cm2 and the maximum (mean) number of macrospores in a sporangium was 113.4; the minimum (mean) values were 13.8 cm2 and 30.6 spores. Further correlations between vitality and fertility parameters were established. It is suggested that the main ecological factors responsible for the differences found in the lakes are effects of climate (including water temperature and duration of seasonal growth), which cause the differences in rosette size and fertility. The percentage of individuals with fertile sporangia was lowest in the slightly humic lakes with boreal climate and short summers, and highest in the clear lakes with temperate climate and long summers. Isoetes individuals showed increased size with depth.},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0343052607\&partnerID=40\&md5=3be747f4cb73f24bc9d8880018c16bd1},
	author = {V{\"o}ge, M.}
}
@article {126,
	title = {Number of leaves per rosette and fertility characters of the quillwort (Isoetes lacustris L.) in 50 lakes of Europe: A field study},
	journal = {Archiv fur Hydrobiologie},
	volume = {139},
	year = {1997},
	note = {Cited By (since 1996):10Export Date: 11 November 2013Source: Scopus},
	month = {1997///},
	pages = {415 - 431},
	abstract = {Isoetes lacustris L. was studied in 35 lakes in the main area of distribution (N and W Europe), plus some other lakes outside of this area, where the species is present. By using SCUBA equipment fertile plants were selected randomly and several morphological and fertility characters were studied. It was found that there was a relationship between: a) the (mean) number of leaves per rosette, and the (mean) number of spores per macrosporangium, b) the number of leaves, and the number of macrosporangia per plant. The number of spores per macrosporangium is related directly to the percentage of fertile plants in the part of the population studied. A low number of leaves per rosette is a fair indication of a low number of macrospores in a sporangium and also a low number of macrosporangia per plant, anti the low number of spores points to a low percentage of fertile individuals in the part of the population studied. It is suggested that the often rapid decline of quillwort in lakes of Central Europe may be a self-accelerating process. In the N European lakes, numbers of leaves and spores have an inverse relationship to the colour of the water. In the W European lake sites, the height of the rosettes is correlated to the Secchi depth. No relationship between plant features and water characteristics (pH and conductivity) were found.},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0342617829\&partnerID=40\&md5=e5b61ab9a7b00c72dbe6bce9554fbc2f},
	author = {V{\"o}ge, M.}
}
@article {85,
	title = {Non-destructive assessing and monitoring of populations of Isoetes lacustris L},
	journal = {Limnologica},
	volume = {34},
	year = {2004},
	note = {Cited By (since 1996):1Export Date: 11 November 2013Source: Scopus},
	month = {2004///},
	pages = {147 - 153},
	abstract = {Extensive studies of Isoetes lacustris, performed throughout Europe, resulted in regressions between the number of leaves per rosette and (1) the number of spores per megasporangium, (2) length of seasonal growth, (3) Secchi depth and (4) water colour plus a relationship between pH and the number of spores per megasporangium. The evaluation of Isoetes populations requires measurements of the lake data Secchi depth, water colour, pH and conductivity, the establishment of climate data and leaf counts on 20-30 plants with the aid of SCUBA. The method may be applied to lakes in a range of situations, varying between lowland and highland, and between temperate and subarctic climate regions. The regressions are displayed graphically. The actual mean leaf number and corresponding megaspore number are compared with the numbers referred to in the environmental data. Consistent values point to the parameters which influence growth and vitality of the quillwort and to what extent, in a particular lake. Examples of evaluation and monitoring are given.},
	keywords = {Climate, Conductivity, Evaluation, Isoetes lacustris, Leaf number, Light availability, Megaspore number, pH value},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-17944391690\&partnerID=40\&md5=bc81c2908849af47d9ff68a2cff5dbc9},
	author = {V{\"o}ge, M.}
}
@article {58,
	title = {The reproductive phenology of Isoetes lacustris L.: Results of field studies in Scandinavian lakes},
	journal = {Limnologica},
	volume = {36},
	year = {2006},
	note = {Cited By (since 1996):1Export Date: 11 November 2013Source: Scopus},
	month = {2006///},
	pages = {228 - 233},
	abstract = {The phenologic change of the leaf rosette structure of Isoetes lacustris L. was studied in 26 lakes of temperate, boreal, or subarctic Scandinavia between 59{\textdegree} and 70{\textdegree} n.l. The investigations were carried out during six defined seasons: late winter, spring, early summer, late summer, autumn, and early winter. From 640 plants, gained with the aid of SCUBA, six leaf types were distinguished: immature megasporophylls, mature megasporophylls, immature microsporophylls, mature microsporophylls, and sporophylls that had released their spores and leaves with undeveloped sporangia. Mean numbers per rosette of each leaf type were established in each study lake and study season, resulting in a common pattern embracing all lakes studied. Megasporophylls are developed throughout the year, whenever the water temperature is about 10 {\textdegree}C. Their share was always more than 30\%, excepting winter. Microsporophylls are produced preferentially in spring/early summer when the days are longest; they amount to more than 50\% of the rosette leaves during this period, but only to some 10\% in the remaining seasons. The spores mature and are released between late summer and early winter. It is concluded that not all spores mature in the year of their birth, and those that do not mature are released in the early summer of the following year, as well as the old empty leaves become detached. {\textcopyright} 2006 Elsevier GmbH. All rights reserved.},
	keywords = {Climate, Isoetes lacustris, Reproductive phenology, Rosette development, Seasons},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33750991320\&partnerID=40\&md5=43e430d0fc4386c8148a6682853d96ab},
	author = {V{\"o}ge, M.}
}
