Vertical distribution of Calanus finmarchicus and C. helgolandicus in relation to the development of the seasonal thermocline in the Celtic Sea

1985 ◽  
Vol 86 (2) ◽  
pp. 145-149 ◽  
Author(s):  
R. Williams
Keyword(s):  
Vertical Distribution ◽  
Calanus Finmarchicus ◽  
Seasonal Thermocline ◽  
Celtic Sea

Vertical distribution of plankton in the skagerrak in relation to doming of the seasonal thermocline

1982 ◽  
Vol 1 (2) ◽  
pp. 209-219 ◽  
Author(s):  
R.D. Pingree ◽  
P.M. Holligan ◽  
G.T. Mardell ◽  
R.P. Harris
Keyword(s):  
Vertical Distribution ◽  
Seasonal Thermocline

scholarly journals The Vertical Distribution of Marine Macroplankton. XII. Some Observations on the Vertical Distribution of Calanus finmarchicus in Relation to Light Intensity.

1934 ◽  
Vol 19 (2) ◽  
pp. 569-584 ◽  
Author(s):  
F. S. Russell
Keyword(s):  
Light Intensity ◽  
Vertical Distribution ◽  
Calanus Finmarchicus ◽  
Upper Limit ◽  
Electric Measurement ◽  
The Vertical Distribution

1. Observations are given on the vertical distribution of adult Calanus finmarchicus in the daytime off Plymouth in July and August, 1931, as a result of collections made simultaneously with the photo-electric measurement of submarine illumination.2. A series of nets, usually six, was towed simultaneously in such a manner that the depth of each net was known approximately.3. The female Calanus in July preferred higher intensities of light than did the females in August; this change was coincident with a change in the Calanus population as shown by size measurements. A similar change in distribution and in population was shown by the males.4. The females in July were living in intensities of 20,000 m.c. and more; but those in August were avoiding such high intensities. The males in July avoided intensities of 40,000 m.c. and over, while in August their upper limit was about 10,000 m.c.

scholarly journals The Vertical Distribution of Marine Macroplankton IV. The Apparent Importance of Light Intensity as a Controlling Factor in the Behaviour of Certain Species in the Plymouth Area.

1926 ◽  
Vol 14 (2) ◽  
pp. 415-440 ◽  
Author(s):  
F. S. Russell
Keyword(s):  
Light Intensity ◽  
Vertical Distribution ◽  
Laboratory Experiments ◽  
External Factor ◽  
Controlling Factor ◽  
Calanus Finmarchicus ◽  
Different Depths ◽  
The Vertical Distribution

Results of collections with the ring-trawl to obtain evidence on the vertical distribution of plankton animals in daylight at different times of the year and at night are given.The vertical distribution of Calanus finmarchicus and Cosmelira pilosella is discussed in relation to the distribution of light intensity in the sea.Results show that light intensity is apparently the external factor of greatest importance in determining the vertical distribution of these plankton animals in this region.Many more observations at sea correlated with simultaneous records of light intensity at different depths are required, together with laboratory experiments on the effects of various factors on the behaviour of plankton animals kept under different conditions of light intensity.

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