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Titolo:
Regularities in primary production, Secchi depth and fish yield and a new system to define trophic and humic state indices for lake ecosystems
Autore:
Hakanson, L; Boulion, VV;
Indirizzi:
Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden Uppsala Univ Uppsala Sweden S-75236 t Earth Sci, S-75236 Uppsala, Sweden Russian Acad Sci, Inst Zool, St Petersburg 199034, Russia Russian Acad Sci St Petersburg Russia 199034 t Petersburg 199034, Russia
Titolo Testata:
INTERNATIONAL REVIEW OF HYDROBIOLOGY
fascicolo: 1, volume: 86, anno: 2001,
pagine: 23 - 62
SICI:
1434-2944(2001)86:1<23:RIPPSD>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
SMALL GLACIAL LAKES; SALMONID COMMUNITY; PHYTOPLANKTON PRODUCTION; STANDING CROP; EXPLOITATION; EUTROPHICATION; INTRODUCTIONS; MODELS; PARAMETERS; PREDICTION;
Keywords:
aquatic ecosystems; primary production; environmental factors; latitude; trophic status; humic status; fish production;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
114
Recensione:
Indirizzi per estratti:
Indirizzo: Hakanson, L Uppsala Univ, Dept Earth Sci, Villav 16, S-75236 Uppsala, Sweden Uppsala Univ Villav 16 Uppsala Sweden S-75236 Uppsala, Sweden
Citazione:
L. Hakanson e V.V. Boulion, "Regularities in primary production, Secchi depth and fish yield and a new system to define trophic and humic state indices for lake ecosystems", INT REV HYD, 86(1), 2001, pp. 23-62

Abstract

General relationships between phytoplankton production, chlorophyll, total. dissolved and particulate phosphorus, Secchi depth, humic level, trophic level, fish production and latitude are described by regression equations using an extensive "Soviet" data base covering a wide domain of lake characteristics and a European data base. New systems for defining lake trophic and humic status are presented. The results may be used for more precise estimates of fundamental lake properties and for many practical issues of lake management, e.g.. predictions of fish catch. We have used strict chlorophyll-a concentrations for every trophic class and we have omitted Secchi depthfrom the trophic classes. sines Secchi depth and other variables strongly related to water clarity (like suspended particulate matter and particulateorganic carbon) depend on autochthonous production, allochthonous influences and resuspension. We have used the Secchi depth as a simple operational measure of the effective depth of the photic zone. It has also been shown that among these lakes there exist a very strong relationship between primary production and latitude. In fact. 74% of the variability among the lakes in mean summer primary production can be statistically related to variations in latitude. These data also show a strong relationship between primary production and fish yield, which can be used to address many fundamental issues in lake management, like "normal and abnormal fish production".

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Documento generato il 01/04/20 alle ore 22:59:21