. -D d D7 d d D4 d "W5990 WS|Wl WS992 WSW WS994 WS995 ⢠⢠TOTAL DIATOMS -⦠CHAETOCERACEAE â -' "PENNATAE' ». BIDDULPHIINEAE o DISCINEAE â SOLENIINEAE \ '" \ \ \V B X) IOO SEA MILES FROM LAND F'g- 75- Estimated total diatoms, and diatom group totals, survey I. A. Sylvia Hill line, io-ii March 1950. B. Southern Intermediate line, 11-12 March 1950. predominating chaetocerids. The other groups clearly fulfilled a minor role, much on the same level, with 'Pennatae' of some consequence inshore. Apart from the profusion of neritic Chaetoceros species, at least ten in number, the sp
. -D d D7 d d D4 d "W5990 WS|Wl WS992 WSW WS994 WS995 ⢠⢠TOTAL DIATOMS -⦠CHAETOCERACEAE â -' "PENNATAE' ». BIDDULPHIINEAE o DISCINEAE â SOLENIINEAE \ '" \ \ \V B X) IOO SEA MILES FROM LAND F'g- 75- Estimated total diatoms, and diatom group totals, survey I. A. Sylvia Hill line, io-ii March 1950. B. Southern Intermediate line, 11-12 March 1950. predominating chaetocerids. The other groups clearly fulfilled a minor role, much on the same level, with 'Pennatae' of some consequence inshore. Apart from the profusion of neritic Chaetoceros species, at least ten in number, the species of most importance were: Among the Discineae, inshore, Stephanopyxis turris diminishing rapidly as one proceeded seawards; and Thalassiosira sabtilis, which reached its highest numbers and relative importance at station WS 983. Among the Biddulphiineae, Eucampia zoodiacus at the two inshore stations only. Among the Soleniineae, Dactyliosolen mediterraneus and much lesser numbers of the more cosmo- politan Rhizosolenia spp. farther offshore. Among the ' Pennatae', Fragilaria Karsteni and Asterionella japonica inshore with Thalassiothrix longissima at station WS 984. On the Sylvia Hill and southern intermediate lines, diatom distribution followed an essentially similar pattern. Very high estimated totals were recorded inshore, with an abrupt decrease near the shelf-edge some 60 sea-miles from the land, and a levelling out to very low values towards the sea-
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
