MICROPLANKTON 



235 



Table 16. First survey {autumn). 



Station 



WS964 

 WS965 

 WS966 

 WS967 

 WS968 

 WS969 

 WS970 



WS971 

 WS972 

 WS973 

 WS974 

 WS97S 



WS976 

 WS 977 

 WS978 

 WS 979 

 WS980 

 WS981 



'WS 982 

 WS983 

 WS984 

 WS985 



WS986 

 WS987 

 WS988 

 WS989 



WS990 

 WS 991 

 WS 992 



WS993 



WS 994 

 WS99S 



WS996 

 WS 997 

 WS998 

 WS 999 

 WS 1000 

 WS 1001 

 WS 1002 



Estimated 



total 



diatoms 



73. '24 

 143,400 



363.750 



i.°34> 2 5° 



22,500 



4,118,400 



1,382,500 



386,000 

 972,000 

 1,010,000 

 314,000 

 202,000 



282,000 



212,000 



816,000 



98,328,000 



45.344.°°° 

 9,987,300 



74,070,000 

 40,180,800 

 69,432,000 

 27,477,000 



97,300 



1 1 ,400 



270,450,000 



158,508,000 



74,006,400 



258,300,000 



50,692,800 



19,800 



16,800 



12,300 



16,000 



13,800 



3,000 



1,200 



42,300 



7,758,000 



43,710,000 



Discineae 



Estimated total diatoms and numbers in the main 

 Biddulphiineae Chaetoceraceae Soleniineae 



diatom groups 

 ' Pennatae ' 



Numbers 



47,060 



123,000 



26,250 



61,750 



i,5 00 



833.184 



108,500 



18,000 

 147,000 

 276,000 

 156,000 



24,000 



20,000 



20,000 



21,600 



2,000,000 



1,936,000 



2,185,200 



1,302,000 



2,305,200 



168,000 



396,000 



4.3 00 



3,600 



9,720,000 



8,649,000 



4,147,200 



nil 



100,800 



4,200 



1,800 



1,800 



3,000 

 4.5 00 

 75° 

 nil 



300 

 nil 

 nil 



/o 

 64-4 

 8 5 -8 



7-2 



3-8 

 67 



20-2 



7-8 



47 

 15-1 



27-3 

 497 

 n-9 



7-1 



9-4 

 2-6 



2-0 



4'3 

 21'9 



i-8 



57 



0-2 



4'4 



3i-5 

 3-6 



5-5 



5-6 



0-2 

 21-2 

 I0"7 

 14-6 



18-8 



32-6 



25-0 

 07 



Numbers 



nil 

 nil 

 nil 

 30,000 

 nil 



2 43>93 6 

 112,000 



nil 

 nil 

 nil 

 nil 

 nil 



nil 

 nil 

 nil 



80,000 



3,328,000 



194,400 



384,000 

 648,000 



nil 



nil 



2,500 



nil 

 7,470,000 

 4,329,000 



105,600 

 nil 



96,000 

 nil 

 nil 

 nil 



nil 

 nil 

 nil 

 nil 

 nil 

 nil 

 nil 



5-9 

 8-2 



Numbers 



nil 

 nil 



206,250 



1,030,000 



2,250 



'23-552 

 172,000 



8,000 

 33,000 

 nil 

 ml 

 34,000 



6,000 



64,000 



552,000 



93,888,000 



22,080,000 



2,57°.4°° 



59,580,000 



36,792,000 



67,968,000 



25,992,000 



34,000 



6,900 



2-7 208,170,000 



2-7 118,872,000 



0-2 56,448,000 



— 243,450,000 

 0-2 45,024,000 



9.3°° 

 5.!°° 

 8,400 



2,000 



300 



500 



200 



41,400 



— 7.434.000 



— 38,006,000 



o-i 

 69 



2-0 



0'5 

 i-6 



2-6 



°/ 

 /o 



567 

 63-0 

 io-o 



3-o 



12-4 

 2-1 



3-4 

 16-8 



2-1 

 30-2 

 67-6 



95-5 

 49-1 



257 

 80-4 

 916 

 97-9 

 94-6 



34"9 

 60-5 

 77-0 



75-o 



7 6 '3 

 94-3 



88-8 

 47-0 



30-4 

 68-3 



!2"5 

 2-2 

 16-7 

 167 

 97-9 



95-8 



87-0 



0/ 

 A> 



Numbers 



'9.548 

 8,400 



35.00° 



32,500 



12,000 

 484,704 11-38 

 810,000 58-6 



334.o°° 

 231,000 

 418,000 



46,000 



18,000 



58,000 

 62,000 

 74,400 

 32,000 

 264,000 

 69,300 



1,488,000 



72,000 



336 000 



45,000 



10,000 



900 



4,005,000 



1,512,000 



614,400 

 nil 

 nil 



4,500 



2,400 

 nil 



4,000 



2,400 



nil 

 400 

 600 



nil 



nil 



26-7 



5-8 

 8-6 



2-0 



53-2 



58-6 

 23-8 

 41-4 

 14-6 

 8-9 



20-6 



29-3 



92 



<o-i 



o-6 



°7 



2-0 

 0-2 



o-5 



0-2 



10-3 



8-o 



i'5 

 0-9 



o-8 



22-7 

 H-3 



25-0 

 17-4 



33-3 

 '•4 



Numbers 



6,516 



12,000 



96,250 



480,000 



6,750 



2,433,024 



180,000 



26,000 

 516,000 

 316,000 

 112,000 

 126,000 



198,000 



66,000 



68,000 



2,328,000 



17,736,000 



4,968,000 



11,316,000 

 363,600 



960,000 

 1,044,000 



46,500 



nil 

 41,085,000 

 25,146,000 



12,691,200 



14,850,000 



5,472,000 



1,800 



7,500 



2,100 



7,000 

 6,600 



x >75° 

 600 

 nil 



324,000 

 5,704,000 



0/ 

 /o 



8-9 



8-4 



26-5 



29-4 

 30-0 



59-i 



13-0 



67 



577 



357 

 62-4 



70-2 

 31-1 



20-6 



2-4 



391 



497 



'5'3 

 0-9 



i-4 



3-8 



47-8 



15-2 

 x 5'9 



17-1 



57 

 io-8 



91 

 44-6 

 17-1 



437 

 47-8 

 58-3 



5°'3 



4-2 

 13-0 



diminishing to characteristically small oceanic values offshore. There was a marked minimum between 

 the two peaks, believed to be due to intrusion of offshore water. 



Considering the groups severally, it can be seen that the Discineae reached their greatest numbers 

 in the richer inshore water. Here the neritic Stephanopyxis was dominant. The greatest relative 

 importance of the group was attained at the poorer offshore stations, however, where the essentially 

 oceanic Planktoniella sol accounted for most of the group-total. 



Biddulphiineae were observed only at the two inshore stations, and at the secondary peak station 

 near the shelf-edge. The neritic species Eucampia zoodiacus was the only one seen in the fractions 

 counted, and the group was of little relative importance. 



Chaetoceros species were unusually scanty close inshore, but predominated at the shelf-edge peak 

 station. The group was not seen at all at the two offshore stations though these were re-examined 

 carefully. 



15 



