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.)

ISBN-10: 3642822754

ISBN-13: 9783642822759

ISBN-10: 3642822770

ISBN-13: 9783642822773

It is a excitement and a different honour for me to greet the contributors, visitors and ob­ servers of this Fourth overseas Symposium on Antarctic Biology which has followed nutrient cycles and nutrition webs as its significant topic. On behalf of the clinical Committee on Antarctic learn (SCAR) and different our bodies of the foreign Council of clinical Unions (ICSU), I bid you welcome. SCAR is happy to recognize the function 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 overseas Union of organic Sciences (IUBS). furthermore, SCAR and its co-sponsors desire to recognize the monetary help of the Council for clinical and business Re­ seek (CSIR) and the dept of shipping (DOT) of the South African govern­ ment. Nor may still we disregard to recognize additionally the function of the South African clinical Committee on Antarctic study (SASCAR) and one in every of its leaders and vice chairman of SCAR, Mr. Jan de Wit, in arranging this captivating venue for this Symposium.

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4 lationship between Cu and nutrients and primary production. The Cu and nutrient data (Appendix 1) show that these chemical components are not growth limiting. These high surface concentrations are maintained by the upwelling of deep enriched water to the euphotic zone. 5 nmol kg-1 ) those closer to the coastal upwelling areas have higher surface concentrations (1-2 nmol kg-1 ) (Bruland 1980). 25 nmol kg-1 (Boyle and Edmond 1975). Two important points should be noted from Fig. 4: the magnitude of the depletion of Cu at each station and how it changes meridionally; and, the depth of the sub-surface maximum which results from the regeneration-scavenging processes.

The ratios of the N and P anomalies are close to Redfield's model, in near-surface (uptake) and deep waters (regeneration). Si anomalies in deep and bottom waters, relative to N, are relatable to biological activity (high demand of Antarctic diatoms for silicate, high transport of biogenic silica toward the deep layers). References Alvarez-Borrego S, Guthrie D, Culberson CH, Park PK (1975) Test of Redfield's model for oxygen nutrient relationships using regression analysis. Limnol Oceanogr 20:795-805 Aminot A, Kerouel R (1982) Dosage automatique de l'uree dans l'eau de mer une methode tres sensible a Ia diacetylmonoxime.

Darker hues signify relatively high chlorophyll-a concentrations. The data are from the Coastal Zone Colour Scanner of the Nimbus-7 satellite for 16 June 1979. Snit 1/4 indicates the location of the temperature and chlorophyll-a sections shown in Fig. , :; ;;; 16° ! 14° t; a. , a: u ~ . " :a u r:: 12° Jl " a: Agulhas Current filament 10 100 50 D i stance 150 (pixels) Fig. 9. The inferred sea-surface temperature (4) (from infra-red radiance values) and chlorophyll-a (J) (from the radiance ratio R3t) across an Agulhas Current filament.

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


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