44 



ASTRID CLEVE-EULER, QUANTITATIVE PLANKTON RESEARCHES IN THE SKAGER RAK. 



Table 67. 



S, Sfcag. 5. 57° 42' N. 



9° 51' E. 18. IV. 1914. 



i 



CD 



Q 



Tempera- 

 ture ° C. 



O 



O 



o 



>> 



.i 



"3 



CO 



o 



>> 



"Si 



a 



m 



A 



Coscinodis- 



cus con- 



cinnus 



o3_ 



n> w 

 50 



cä 03 

 ■— -m 



2 J 



. co 



C 3 

 .- o 



o -a 



C CO 



CD 3 

 T! 



Rhizosolenia 

 semispina 



Rhizosolenia 

 gracillima 



Guinardia 

 flaccida 



OS 



S g 

 o ° 



2.3 



CL CO 



■a c 



3 aj 

 ■n c 



K 



Diatoms 



total 

 numbers 







7,05 



29,36 



23,01 





120 



20 



5,140 



2,840 





60 



1,220 





13,710 



10 



5,92 



32,95 



25,97 







200 



36,200 



10,200 







2,740 



70 



55,580 



20 



5,59 



33,60 



26,52 



60 





300 





1,280 









60 



2,840 



30 



5,58 



33,78 



20,67 



100 





100 





960 









80 



1,890 



40 



5,67 



34,00 



20,82 



60 



130 



1,060 





1,480 









360 



5,460 



50 



5,67 



34,05 



20,86 



110 



1,100 



2,070 



20 



870 





40 





640 



7,170 



52 



5,67 



— 



— 



240 



1,380 



1,950 



30 





1,280 







930 



9,650 



The most characteristic diatoms of the relatively pure Jutland Current are Paralia, 

 Biddulphia sinensis, wbich large diatom is following the bottom, with 930 ind. per 1 

 at 52 m, and Coscinodiscus concinnus, forms, that all are found at S. Extra II. Also 

 Rhizosolenia semispina must belong to the same association, as it cannot have sunken 

 independently of Leptocylindrus from the surface-layer. If the present series from S. 

 Skag. 5 be compared with the one taken a year earlier (cfr table 31, p. 24), the aspects 

 are verv little alike. Instead of the Cosc. concinnus — Biddulphia sinensis water from 

 the North Sea, we find in April 1913 a very salt water throughout, that, however, does 

 not show any distinct diatom-plankton of its own, the forms occurring being rests from 

 the winterly Sira-plankton and off-throws from the rich LeptocyMndrus-form&tion in the 

 Dano-Swedish waters, finally immigrants of a more Northern type from the Central Ska- 

 ger Rak. 



Table 68. S. Skag. 5. 57° 42' N., 9° 51' E. 18. IV. 1914. 



Si 



O, 



CD 



P 



£ ö 



©o 



o. 



s £ 



CD 3 



o 

 o 



"3 



CO 



>> 



m 



C 



CD 



Q 



5 

 "3 



o 

 a 

 B 

 >> 



O 



.2 

 ca 



u 

 cd 

 O 



dB 

 "3 



is 



u 

 O 



Peridiniales 



total 



numbers 



g 



3 

 C 



O 

 CO 



CD 



g 



Si 

 o 

 o 



.fl 



at 



►-3 



Protozoa 



total 

 numbers 







7,05 



29,36 



23,01 



1,240 



50 



520 



2,930 



5,040 



1,020 



6,520 



10 



5,92 



32,95 



25,97 



1,260 



430 



360 



2,990 



700 



2,140 



2,980 



20 2 



5,59 



33,60 



26,5 2 



60 



520 





1,100 



1,200 



700 



2,420 



30 



5,58 



33,78 



26,67 



80 



260 



40 



400 



680 



20 



860 



40 



5,67 



34,00 



26,82 



70 



130 





250 



150 



40 



220 



50 



5,67 



34,05 



26,86 



70 



70 





200 



150 



230 



750 



52 



5,67 



— 



— 



10 



70 





130 



110 



30 



180 



With an exception for Mesodinium, that is a most decided surface-organism, the 

 maxima for peridinians and infusorians, as well as for the diatoms, lie in the connecting 

 10 m-layer. 



1 Chiefly very delicate specimens, about 4 u. in diameter. 



2 Very mucli detritus in the sample. 



