Kongl. Svenska Vetenskaps-Akademiens Handlingar Volume 32

Kongl. Svenska Vetenskaps-Akademiens Handlingar Volume 32

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...many species of northern origin may remain during. the summer emprisoned in the fjords, especially in their deeper water. The ternpemture of the chaztoplankton-water varies usually between 5 and 9 and the salinity is about 35 p. m. The organisms of the chaetoplankton are chiefly diatoms, especially Cha)t0ce1'0s decipiens and Ch. constrictus. C. borealis and C. crz'0v2/zilus occur both in ch eto-and trichoplankton so that it is ditficult to decide whether they belong to one or the other type. Another organism, the flagellate Plzwocystis Pouchetii, appears in the same time as Chastoeeros decipiens, frequently in great abundance, and has about the same distribution. I therefore include also that organism among the chzeto-species. IV. Triehoplankton (Sign This type rules in the western Atlantic and constitutes in the summer the plankton of the Irminger Sea. Its origin is doubtful. Typical trichoplankton was gathered in the Bering Sea during the expedition of the Vega and it is an open question whether it spreads from the northern Pacific to the northern Atlantic or vice versa. In the winter (l897--98) the characteristic species of the trichoplankton appeared as far down to the south as to the south of the Azores, which possibly may be owing to the plankton of the Labrador-current having been conveyed by the south-going branch of the Gulf-stream. In the summer it is confined t.o the western and arctic Atlantic, but in the winter it spreads to Scandinavia. The temperature of the trichoplankton-water varies between 6 and 120 and the salinity amounts to about 34 p. m. As the trichoplankton frequently becomes mixed with chzetoplankton and with siraplankton it is a difiicult matter to make out to what type a number of species really belong. I...
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Product details

  • Paperback | 138 pages
  • 189 x 246 x 8mm | 259g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236969669
  • 9781236969668