scholarly journals Hypolimnetic assimilation of ammonium by the nuisance alga Gonyostomum semen

2020 ◽  
Vol 6 (2) ◽  
pp. 92-105 ◽  
Author(s):  
Thomas Rohrlack ◽  
Keyword(s):  
Gonyostomum Semen

Regular high contribution of Gonyostomum semen to phytoplankton biomass in a small humic lake

2002 ◽  
Vol 28 (1) ◽  
pp. 488-491
Author(s):  
Kalevi Salonen ◽  
Anna-Liisa Holopainen ◽  
Jorma Keskitalo
Keyword(s):  
Phytoplankton Biomass ◽  
Humic Lake ◽  
High Contribution ◽  
Gonyostomum Semen

scholarly journals DIEL VERTICAL MIGRATION OF Gonyostomum semen (Raphidophyceae) IN KAWAHARA LAKE

2002 ◽  
Vol 46 ◽  
pp. 1061-1066 ◽  
Author(s):  
Youichi TAKEMOTO ◽  
Katsuhiro FURUMOTO ◽  
Akihide TADA
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Gonyostomum Semen

Factors influencing Gonyostomum semen blooms in a small boreal reservoir lake

Hydrobiologia ◽  
2005 ◽  
Vol 533 (1-3) ◽  
pp. 243-252 ◽  
Author(s):  
D. L. Findlay ◽  
J. J. Paterson ◽  
L. L. Hendzel ◽  
H. J. Kling
Keyword(s):  
Factors Influencing ◽  
Gonyostomum Semen

scholarly journals High iron requirements for growth in the nuisance alga Gonyostomum semen (Raphidophyceae)

2021 ◽  
Author(s):  
Karla Münzner ◽  
Raphael Gollnisch ◽  
Karin Rengefors ◽  
Judita Koreiviene ◽  
Eva S. Lindström
Keyword(s):  
High Iron ◽  
Gonyostomum Semen

Structure of the chloroplast and its DNA in chloromonadophycean algae

1981 ◽  
Vol 49 (1) ◽  
pp. 401-409
Author(s):  
A.W. Coleman ◽  
P. Heywood
Keyword(s):  
Endoplasmic Reticulum ◽  
Cell Membrane ◽  
Nuclear Envelope ◽  
Chloroplast Dna ◽  
Single Layer ◽  
Longitudinal Axis ◽  
Chloroplast Envelope ◽  
Large Numbers ◽  
Gonyostomum Semen ◽  
Chloroplast Stroma

The arrangement and ultrastructure of chloroplasts is described for the Chloromonadophycean algae gonyostomum semen Diesing and Vacuolaria virescens Cienkowsky. The chloroplasts are present in large numbers and are discoid structures approximately 3–4 micrometer in length by 2–3 micrometer in width. In Gonyostomum semen the chloroplasts form a single layer immediately interior to the cell membrane; frequently their longitudinal axis parallels the longitudinal axis of the cell. The chloroplasts in Vacuolaria virescens are more than I layer deep and do not appear to be preferentially oriented. In both organisms, chloroplast bands usually consist of 3 apposed thylakoids, although fusion and interconnections between adjacent bands frequently occur. External to the girdle band (the outermost thylakoids) is the chloroplast envelope. This is bounded by endoplasmic reticulum but there is no immediately apparent continuity between this endoplasmic reticulum and the nuclear envelope. Electron-dense spheres in the chloroplast stroma are thought to be lipid food reserve. Ring-shaped electron-translucent regions in the chloroplast contain chloroplast DNA. The DNA is distributed along this ring in an uneven fashion and, when stained, resembles a string of beads. Each plastid has I ring, and the ring is unbroken in the intact plastid.

scholarly journals Vertical distribution of expansive, bloom-forming algae Gonyostomum semen vs. plankton community and water chemistry in four small humic lakes

2018 ◽  
pp. 28 ◽  
Author(s):  
Wojciech Pęczuła ◽  
Magdalena Grabowska ◽  
Piotr Zieliński ◽  
Maciej Karpowicz ◽  
Mateusz Danilczyk
Keyword(s):  
Vertical Distribution ◽  
Water Column ◽  
Zooplankton Community ◽  
Lake Ecosystem ◽  
Humic Lakes ◽  
Chemical Parameters ◽  
Ammonium Ions ◽  
Planktonic Bacteria ◽  
Morphometric Features ◽  
Gonyostomum Semen

One of the features of Gonyostomum semen, a bloom-forming and expansive flagellate, is uneven distribution in the vertical water column often observed in humic lakes. In this paper, we analysed vertical distribution of the algae in four small (0.9–2.5 ha) and humic (DOC: 7.4–16.5 mg dm−3) lakes with similar morphometric features with the aim to test the hypothesis that vertical distribution of G. semen may be shaped by zooplankton structure and abundance. In addition, we wanted to check whether high biomass of this flagellate has any influence on the chemical composition as well as on planktonic bacteria abundance of the water column. The results of the study showed that vertical distribution of the algae during the day varied among all studied lakes. Our most important finding was that (a) the abundance and structure of zooplankton community (especially in case of large bodied daphnids Daphnia pulicaria, D. longispina and copepod Eudiaptomus graciloides) may shape G. semen vertical distribution in studied lakes; (b) high G. semen biomass may decrease the content of ammonium ions in the water column by intense uptake, but has low effect on other water chemical parameters. The results of the study contribute to the understanding of the factors influencing this expansive algae behaviour as well as it shows interesting aspects of G. semen influence on some components of the lake ecosystem.

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