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



of southern type invading simultaneously at S. Skag. 6. They are further restricted to a 

 thin layer between the real surface-water and the large masses below 30 m. Another 

 interesting f eature is that Leptocylindrus, having here its maximum of 173,000 ind. per 1 — 

 by the bye the largest number of that species observed anvwhere during this April- 

 fishing — has for the largest part passed into an anomalous stage, to be described in the 

 latter part of this werk. I am not yet sure, whether it is resolving into numbers of zoo- 

 spores or if it is simply exhausted by a parasite. In any case it is evident, that this unusual 

 beliaviour of the alga is more or less directly caused by its arriving into a medium of 

 much higher salinity, than is normally suiting its taste. 



The main part of all the Leptocylindrus-vegetsition, present at S. Skag. 8, must have 

 been drifting there from fresher parts of the Sea, and is thus in course of time getting 

 destroyed. 



Table. 72. S. Skag. 8. 58° 10' N., 9° 18' E. 18. IV. 1914. 



J2 



ca 

 Q 



gd 



s t 



ID 3 



o 

 o 



'3 

 w 



O 



>> 

 ■** 



'53 



c 



CD 



Q 



1 



o 



1 



o 



.5 

 ca 



u 



ca 



Peridinia 



Pendiniales 



total 



numbprs 



S 



3 



O 

 w 



CD 



a 



ca 

 o 



.O 



CS 



1-1 



Protozoa 



total 

 mimbers 







6,58 







740 



80 



420 



2,260 



60 



60 



200 



10 



5,43 



34,36 



27,08 



540 



230 



220 



2,450 



260 



1,260 



2,220 



20 



5,94 



— 



— 



460 



120 



300 



1,140 



120 



140 



580 



30 



6,38 



34,61 



27,22 



180 





40 



400 



220 





400 



40 



7,01 



34,79 



27,26 



40 





20 



240 



200 





220 



60 



7,ou 



34,81 



27,26 



10 







50 



20 



30 



80 



100 



7,05 



34,87 



27,33 



40 





40 



130 



20 





70 



150 



7,02 



34,94 



27,39 



70 





30 



170 







30 



200 



7,00 



35,08 



27,50 



20 







20 







60 



G44 



6,03 



34,97 



27,55 







20 



20 









The distribution of peridinians and injusorians does not present anything parti- 

 cular, cfr table 72. The highest numbers were noted in the 10 m-sample; the bottom- 

 water beneath 30 m is very poor and totally free from Ceratia. 



Table 73. S. Skag. 9. 58° 21' N., 8° 56' E. 18. IV. 1914. 



ca 



Q 



Tempera- 

 ture C." 



o 



>> 



■+3 



'a 



"ös 



>> 



CO 



C 

 ca 



Q 



cS 



■£ CO 



.2 CB 



s - a 



ca ca 

 H 



-2 ^ 

 "C ~ 

 ca c8 



3.2 



C3 



S £ 

 ca c 



3 5 

 O m 



-4J CO 



ca - 1 - 3 



-i co 



ca o 

 o o 

 02 



CO 



■ 5 O 



>>i 



o ca 



O -V 



ca 



a 



ca .S 



"o A 

 co m 



N £ 

 '" <a 



*— CO 



Thalassio- 

 thrjx 



longissima 



ii 



ii 

 M 



cS 



CÖ o 

 C O 



■s« 



o 



Biddulphia 



sinensis 



Diatoms 



total 

 numbers 



20 



5,14 



(33,68 



26,63) 



80 





700 



1,700 



120 





380 



60 



20 5,070 



40 



5,15 



33,55 



26,53 



60 



800 



1,600 



720 



140 



20 





80 



20 



5,220 



60 



5,22 



34,00 



26,87 



210 





810 



290 



100 



90 



60 



15 



110 



3,060 



100 



5,24 



34,11 



26,96 



130 



250 



640 



90 



50 



20 



. 80 





110 



2,460 



200 



5,81 



34,51 



27,21 



360 





1,530 



7,820 



420 



3,180 



1,070 



70 



1,260 



18,260- 



