Observations on diurnal vertical migration and phased cell division for three coexisting marine dinoflagellates

1991 ◽  
Vol 13 (6) ◽  
pp. 1313-1324 ◽  
Author(s):  
Per Olsson ◽  
Edna Granéli
Keyword(s):  
Cell Division ◽  
Vertical Migration ◽  
Diurnal Vertical Migration ◽  
Marine Dinoflagellates

scholarly journals Diurnal vertical migration of some cladocerans in relation to the physico-chemical factors in a fish pond

1970 ◽  
Vol 20 (2) ◽  
pp. 147-154 ◽  
Author(s):  
AS Bhuiyan ◽  
S Akhter ◽  
MMA Quddus
Keyword(s):  
Key Words ◽  
Vertical Migration ◽  
Fish Pond ◽  
Chemical Parameters ◽  
Surface Layers ◽  
Diurnal Vertical Migration ◽  
Physico Chemical ◽  
Chemical Factors ◽  
Diurnal Movement ◽  
The Relationship

Diurnal vertical migration of four genera of cladocerans, namely Diaphanosoma sp., Daphnia sp., Moina sp. and Bosmina sp., during March to December, 2007 showed that the number of Diaphanosoma sp. was 501 units/1 in the surface layers, 172 units/l in the middle layers and 190 units/l in the bottom layers. The yearly number of Daphnia sp. in surface, middle and bottom layerss was 362 units/l, 46 units/l and 189 units/l respectively. In surface, bottom and middle layers, the number of Moina sp. was 159, 71 and 32 units/l, respectively. Bosmina sp. was 78 units/l in surface, 31 units/l in the middle and 33 units/l in the bottom layers. The number of Diaphanosoma sp., Daphnia sp., Moina sp., Bosmina sp., were 455, 149, 259 and 358 units/l, respectively in the morning, 63, 176, 142, 43 units/l at noon and 107, 55, 28, 59 units/l, respectively in the evening. Throughout the study period the cladocerans were always abundant near the surface during morning and evening. Among the factors responsible for the diurnal movement of cadoceran, light played the most important factor. The relationship between the physico-chemical factors and the cladoceran occurrence in the pond was also explored. Key words: Cladocera; Diurnal migration; Physico-chemical parameters; Fish pond DOI: http://dx.doi.org/10.3329/dujbs.v20i2.8975 DUJBS 2011; 20(2): 147-154

Review of information on diurnal vertical migration in the bignose shark (Carcharhinus altimus)

1996 ◽  
Vol 47 (4) ◽  
pp. 605 ◽  
Author(s):  
RC Anderson ◽  
JD Stevens
Keyword(s):  
Vertical Migration ◽  
Pelagic Zone ◽  
Benthic Species ◽  
Diurnal Vertical Migration

The bignose shark (Carcharhinus altimus) has been described in the literature as a deep-benthic species. Evidence is presented that C. altimus is a diurnal vertical migrator. It occurs near the bottom in about 90-500 m by day. At night, at least some individuals move into shallower water or up into the pelagic zone.

Highly replicated sampling reveals no diurnal vertical migration but stable species-specific vertical habitats in planktonic foraminifera

2019 ◽  
Vol 41 (2) ◽  
pp. 127-141 ◽  
Author(s):  
Julie Meilland ◽  
Michael Siccha ◽  
Manuel F G Weinkauf ◽  
Lukas Jonkers ◽  
Raphael Morard ◽  
...  
Keyword(s):  
Vertical Migration ◽  
Planktonic Foraminifera ◽  
Diurnal Vertical Migration ◽  
Stable Species ◽  
Species Specific

Dynamics of refuge use: diurnal, vertical migration by predatory and herbivorous mites within cassava plants

Oikos ◽  
2003 ◽  
Vol 101 (1) ◽  
pp. 59-69 ◽  
Author(s):  
Alexis Onzo ◽  
Rachid Hanna ◽  
Ignace Zannou ◽  
Maurice W. Sabelis ◽  
John S. Yaninek
Keyword(s):  
Vertical Migration ◽  
Refuge Use ◽  
Diurnal Vertical Migration

Extracellular Secondary Metabolite Production by the Marine Dinoflagellate Prorocentrum minimum in Culture

1981 ◽  
Vol 38 (7) ◽  
pp. 864-867 ◽  
Author(s):  
Charles G. Trick ◽  
Paul J. Harrison ◽  
Raymond J. Andersen
Keyword(s):  
Cell Division ◽  
Secondary Metabolite ◽  
Exponential Growth ◽  
Growth Period ◽  
Phosphate Starvation ◽  
Bacterial Toxins ◽  
Prorocentrum Minimum ◽  
Batch Cultures ◽  
Marine Dinoflagellate ◽  
Marine Dinoflagellates

Marine dinoflagellates produce extracellular secondary metabolites that may play a role in the ecology of the producing species. The concentration of one such external metabolite, 1-(2,6,6-trimethyl-4-hydroxycyclohexenyl)-1, 3-butanedione, produced by the marine dinoflagellate Prorocentrum minimum, was determined quantitatively during exponential growth and during senescence in phosphate-starved batch cultures. The pattern of production is similar to the production of many bacterial toxins. There was little production of the β-diketone during the exponential growth period and highest production occurred within 1 wk after cessation of cell division. About 50% of the total β-diketone produced was excreted on a single day, 6 d after phosphate became limiting to growth. Cell lysis or photodestruction of carotenoids do not appear to be the source of this compound.Key words: antibiotic, dinoflagellate, organic excretion, Prorocentrum minimum, secondary metabolite, phosphate starvation

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