On the occurrence of the species of <i>Synura</i> (Chrysophyceae)

Kristiansen, Jørgen

doi:10.1080/03680770.1974.11896367

Cited by 20 publications

(59 citation statements)

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“…The Synura species have been most consistently investigated as regards their occurrence in relation to temperature. The investigation by Kristiansen (1975) from Denmark, by Balonov (1976) from U.S.S.R., and by Kies & Berndt (1984) from Germany show very similar ranges, some of these just as seen from the present investigation (e.g. the very wide temperature range of Sy.…”

Section: Discussionsupporting

confidence: 66%

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Seasonal occurrence of silica-scaled chrysophytes under eutrophic conditions

Kristiansen

1988

Hydrobiologia

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The seasonal occurrence of silica-scaled chrysophytes (Paraphysomonadaceae and Mallomonadaceae) in the eutrophic lake Tystrup So, was examined during 1979-81 in relation to temperature and to overall phytoplankton biomass and composition. The 33 species recorded represent three seasonality types, with occurrence in spring alone, spring and autumn, and during a greater or lesser part of the whole year, including summer. The great majority of the species have their main occurrence in early spring and at low temperatures, perhaps due to effects of the high phytoplankton biomass, especially cyanophytes, during summer and autumn.

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Section: Discussionsupporting

confidence: 66%

“…The Synura species have been surveyed as regards seasonality (Kristiansen, 1975); most species were found in all months of the year.…”

Section: Discussionmentioning

confidence: 99%

Seasonal occurrence of silica-scaled chrysophytes under eutrophic conditions

Kristiansen

1988

Hydrobiologia

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“…Synura have been separated on scale characters, it appears that these characters are correlated with other morphological characters, so that almost each of the species established in this way has its own, often subtle, characteristics in cell and colony morphology. Further it is evident that species defined on scale structure also have distinct occurrence patterns [42]. As for pH, Synura sphagnicola is confined to acid water, S. uvella to alkaline, whereas S.petersenii is ubiquitous.…”

Section: Species Concept In the Synuraceaementioning

confidence: 99%

Problems in classification and identification of Synuraceae (Chrysophyceae)

Kristiansen

1978

Schweiz. Z. Hydrologie

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In the Synuraceae, the silica scales which cover the cell surface are of great taxonomic importance, although their delicate structure requires use of electron microscopy. Many species have been incompletely described by means of light microscopy, and there are serious difficulties in correlating them with species based on electron microscopy of the silica scales. The different types of variation in scale structure are described, and the variation range to be accepted within a species is discussed. However, as sexual reproduction is of rare occurrence in this family, the species concept must be highly arbitrary. It is reassuring then that many species based on scale ultrastructure also exhibit morphological and ecological characteristics. The advantages of scanning and transmission electron microscopy are emphasized for species identification and for detection of small forms with especially delicate scales.

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“…Thus the episodic increases in S. petersenii are not likely due to relief from iron limitation. Synura petersenii has been described as pH indifferent (Kristiansen 1975, Takahashi 1978 and is found over a wide range of pH conditions (Roijackers and Kessels 1986). The optimum pH reported for S. petersenii (i.e., the mean pH weighted for abundance) ranges from 6.4 for 105 Sudbury Ontario lakes (Dixit et al 2002) to 7.2 for 146 northeastern USA lakes (Dixit et al 1999).…”

Section: Discussionmentioning

confidence: 99%

“…petersenii is a flagellated, planktonic, colonial alga belonging to the class Synurophyceae, whose members are often abundant in the metalimnion of oligotrophic to mesotrophic lakes and reservoirs (Siver 2003). S. petersenii is a strict photoautotroph (Holen andBoraas 1995, Jansson et al 1996) that has a wide tolerance for many environmental variables (Kristiansen 1975, Nicholls and Gerrath 1985, Siver 1987.…”

Section: Onset Of Occurrence Of Cucumber Odormentioning

confidence: 99%