Social, economic and cultural perspectives of European inland fisheries: review of the EIFAC symposium on fisheries and society     

M. Sipponen  & D. Gréboval 《Fisheries Management and Ecology》2001,8(4-5):283-293

The contributions presented at the EIFAC Symposium on Fisheries and Society in 2000 are reviewed. There have been considerable advances in many sectors of inland fisheries over the past decade. Nowadays the value of inland fisheries to society is generally better understood and increasingly recognized. However, it was recognized that the allocation of fishery resources and their management could still be made more effective through more extensive application of the recent approaches and techniques discussed during the Symposium and reviewed in the paper.  相似文献   

Evaluation of two N cycle models for the prediction of N mineralization from grassland soils in the UK     

A. Bhogal  A. Bhogal  M.A. Shepherd  D.J. Hatch  L. Brown  S.C. Jarvis 《Soil Use and Management》2001,17(3):163-172

Abstract. The ability of two nitrogen cycle models, of contrasting complexity, to predict N mineralization from a range of grassland soils in the UK, was evaluated. These were NCYCLE, a simple mass balance model of the N cycle in UK grasslands, and CENTURY, a more complex model simulating long-term C, N, P & S dynamics in grassland ecosystems. The models were tested using field measurements of net N mineralization from a range of grassland soils (differing in soil type, history & management practice), obtained over a 2 year period using a soil core incubation technique. This method was considered to measure the total net release of mineral N from the soil organic matter over a specified time, including N which may have been recycled several times. NCYCLE consistently under-estimated mineralization rates at all sites. By contrast, there was some correlation between CENTURY predictions of net N mineralization and field measurements. This may have reflected the different abilities of the two models to simulate N recycling. Neither model, however, was able to predict adequately the effect of cultivation and reseeding on net N mineralization.  相似文献   

Factors Affecting the use of Dreissena polymorpha as a Bioindicator: the PCB Pollution in Lake Como (N. Italy)     

A. Binelli  S. Galassi  A. Provini 《Water, air, and soil pollution》2001,125(1):19-32

The aim of this study was to assess the PCB pollutionof the South-Western branch of Lake Como by using thezebra mussel (Dreissena polymorpha) as abioindicator since its recent reintroduction. Someenvironmental and physiological variables influencingaccumulation processes of organochlorine compounds inDreissena were investigated because climaticfactors may affect life cycle, reproductive stage andage. PCB levels were highest in the soft tissues ofDreissena close to the industrialized area ofComo (2298 ng g^-1 of lipids) and slowly decrease goingnorth, reaching approximately half this value at theclosing section of the lake branch. Nonetheless, thePCB concentrations are well below the dangerous levelsfor the aquatic environment.  相似文献   

Efficacy and safety of an infectious bursal disease virus intermediate vaccine in ovo.     

M Coletti  E Del Rossi  M P Franciosini  F Passamonti  G Tacconi  C Marini 《Avian diseases》2001,45(4):1036-1043

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Sinnesphysiologische Untersuchungen an Schmetterlingsraupen und ihre praktische Bedeutung     

B. Götz 《Journal of pest science》1938,14(8):92-93

Ohne Zusammenfassung  相似文献   

    

Fr. 《Journal of pest science》1941,17(2):24

Ohne Zusammenfassung  相似文献   

Die Errichtnng forftftatiftifcher Bureaur     

J. Albert 《European Journal of Forest Research》1869,13(1):68-69

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Literarische Berichte     

Hausrath  K. Vanselow  Rto  Fürst  I. und R. 《Forstwissenschaftliches Centralblatt》1913,35(3):147-159

Ohne Zusammenfassung  相似文献   

Zum neuen Antrag T?rring     

P 《Forstwissenschaftliches Centralblatt》1913,35(1):38-41

Ohne Zusammenfassung  相似文献   

Neuere Arbeiten zur Wühlmausfrage     

Fr. 《Journal of pest science》1940,16(6):71-71

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