Download Antarctic Nutrient Cycles and Food Webs by R. M. Laws (auth.), Prof. Walter R. Siegfried, Dr. Pat R. PDF

By R. M. Laws (auth.), Prof. Walter R. Siegfried, Dr. Pat R. Condy, Dr. Richard M. Laws (eds.)

It is a excitement and a special honour for me to greet the individuals, visitors and ob­ servers of this Fourth overseas Symposium on Antarctic Biology which has followed nutrient cycles and nutrients webs as its imperative subject matter. On behalf of the clinical Committee on Antarctic study (SCAR) and different our bodies of the overseas Council of medical Unions (ICSU), I bid you welcome. SCAR is happy to recognize the position of the co-sponsors for this Symposium which come with the medical Committee on Oceanic learn (SCOR), the Interna­ tional organization of organic Oceanography (IABO), and the foreign Union of organic Sciences (IUBS). moreover, SCAR and its co-sponsors desire to recognize the monetary help of the Council for medical and business Re­ seek (CSIR) and the dep. of shipping (DOT) of the South African govern­ ment. Nor may still we put out of your mind to recognize additionally the function of the South African medical Committee on Antarctic learn (SASCAR) and one in all its leaders and vp of SCAR, Mr. Jan de Wit, in arranging this fascinating venue for this Symposium.

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Extra resources for Antarctic Nutrient Cycles and Food Webs

Example text

While an increase in thermal stability may be caused at the edges of this warm-water intrusion, where warmer water overlies the colder South Atlantic water, this mechanism may be dismissed as one causing biological enhancement for two reasons. First, water in the surface layers of this area is already thermally stable and, secondly, filaments of this nature have been observed (Lutjeharms 1981 b) to be advected rapidly and to disperse within a few weeks. A continuous plankton bloom in such a turbulent, fast-changing, environment is unlikely.

Samples were collected in 8 1 precleaned Niskin bottles suspended from a new stainless steel hydro-wire. The nutrients were determined ashore by standard auto-analyser techniques on unfiltered samples frozen at -l5°C immediately after collection. Copper, Zn and Cd samples (unfiltered) of volume 1000 cm 3 were acidified to pH 1 with ARISTAR nitric acid and stored frozen at -20°C for shore analysis using atomic absorption-spectometry after a solvent extraction pre-concentration (Monteiro 1982). At all stages, the greatest care was taken to avoid metal contamination as outlined by Bewers and Windom (1982) and others.

Water samples were collected on 2 surveys (1980, 1981) in the Southern Ocean south of South Africa, and these were analyzed for the trace elements copper, zinc and cadmium, in addition to the usual oceanographic parameters (temperature, salinity, dissolved oxygen, phosphate, nitrate and silicate). The results showed that, unlike other areas of the world ocean, there is little evidence that the trace elements follow the systematics of the nutrients. This is ascribed to the low productivity of the area.

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