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The Occurrence of Unusual Species of Chaetognatha in Scottish Plankton Collections

Published online by Cambridge University Press:  11 May 2009

J. H. Fraser
J. H. Fraser
Affiliation:
From the Marine Laboratory, Aberdeen
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Extract

There are six species of Chaetognatha that are usually taken in Scottish plankton samples from the appropriate localities. These are

Sagitta setosa J. Müller, from lower salinity water such as that found in the southern and central North Sea and the Irish Sea.

S. elegans elegans Verrill, from mixed oceanic and coastal water.

S. serratodentata Krohn, from surface and subsurface warm oceanic water of fairly high salinity.

S. maxima (Conant), from cold deep water.

Eukrohnia hamata (Möbius), from cold deep water.

Sagitta lyra Krohn, from warm deep water.

All are valuable indicator species (Meek, 1928; Russell, 1935, 1939; Fraser, 1937, 1939). Of these, the first five have occurred in somewhat varying numbers and distribution according to hydrographic conditions every year since at least 1935, except possibly during the period 1940–45 when no investigations were made. S. lyra has been taken in most of these years, but was not found in 1935, 1936 or 1937. It was, perhaps, most abundant in 1948, and one specimen was taken in that year from the Moray Firth, though its presence there must be regarded as distinctly unusual.

Spadella cephaloptera (Busch) is widely distributed throughout the Scottish area as a bottom-living form and is therefore not included here as planktonic.

There are several other species which occur only occasionally in the Scottish plankton either as individual specimens or in small numbers in specialized localities: for convenience these may be termed unusual species. They are as follows.

Sagitta elegans arctica Aurivillius, which has occurred in several years in the Faroe-Shetland Channel associated with the community characterized by Eukrohnia hamata and Calanus hyperboreus.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 28 , Issue 2 , October 1949 , pp. 489 - 491
Copyright
Copyright © Marine Biological Association of the United Kingdom 1949

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References

REFERENCES

Burfield, S. T., 1930. ‘Chaetognatha’. British Antarctic (‘Terra Nova’) Expedition 1910, Zoology, Vol. VII, No. 4, pp. 303–8.Google Scholar
Fraser, J. H., 1937. The distribution of Chaetognatha in Scottish waters during 1936, with notes on the Scottish indicator species. Journ. Cons. Int. Explor. Mer, Vol. XII, No. 3, pp. 311–20.CrossRefGoogle Scholar
Fraser, J. H., 1939. The distribution of Chaetognatha in Scottish waters in 1937. Journ. Cons. Int. Explor. Mer, Vol. XIV, No. I, pp. 25–34.CrossRefGoogle Scholar
Meek, A., 1928. On Sagitta elegans and Sagitta setosa from the Northumbrian plankton, with a note on a trematode parasite. Proc. Zool. Soc. London, No. 29, pp. 743–76.CrossRefGoogle Scholar
Michael, E. L., 1911. Classification and vertical distribution of the Chaetognatha of the San Diego region. Univ. California Publ. Zool., Vol. 8, pp. 21–170.Google Scholar
Ritter-Zahony, R. Von, 1911. Revision der Chätognathen. Deutsche südpolar Exped., Bd. 13, Zool., V, pp. 1–71.Google Scholar
Russell, F. S., 1935. On the value of certain plankton animals as indicators of water movements in the English Channel and North Sea. Journ. Mar. Biol. Assoc., Vol. XX, pp. 309–32.CrossRefGoogle Scholar
Russell, F. S., 1938. Chaetognatha. Zooplankton sheet I. Cons. Int. Explor. Mer.Google Scholar
Russel, F. S., 1939. Hydrographical and biological conditions in the North Sea as indicated by plankton organisms. Journ. Cons. Int. Explor. Mer, Vol. XIV, pp. 171–92.CrossRefGoogle Scholar
Thomson, J. M., 1947. The Chaetognatha of South-eastern Australia. Council for Sci. Ind. Research, Bull. No. 222. Melbourne 1947, pp. 1–43.Google Scholar
Tokioka, T., 1939. Chaetognatha collected chiefly from the Bays of Sagami and Suruga with some notes on the shape and structure of the seminal vesicle. Rec. Oceanog. Works Japan, Vol. 10, pp. 123–50.Google Scholar