Abbau organischer Phosphorkomponenten aus totem S��wasser-Zooplankton

Krause, Heinrich R.

doi:10.1007/bf00631264

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…The remaining detritus may distort the nutrient ratios of the plankton organisms (Gächter and Bloesch, 1985; Tett et al , 1985). In Lake Constance, nitrogen and phosphorus compounds were decomposed more quickly than carbon during sedimentation (Krause, 1960; Gries, 1995), which led to a higher C:P ratio of detritus compared to that of organisms. In contrast, Healey and Hendzel (1980) found little difference between the nutrient ratios of detrital material and living particles in lakes of different morphology and trophy.…”

Section: Discussionmentioning

confidence: 99%

Seasonal changes of C:P ratios of seston, bacteria, phytoplankton and zooplankton in a deep, mesotrophic lake

Hochstädter

2000

Freshwater Biology

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Summary The C:P ratios of seston, bacteria, phytoplankton and zooplankton were measured twice a week in situ in mesotrophic, large and deep Lake Constance from April to December 1995. Except for zooplankton, a strong seasonality was exhibited with low C:P ratios during P‐enriched early spring conditions and high values during P‐depleted summer conditions. Molar C:P ratios of seston varied between 180:1 and 460:1 demonstrating moderate phosphorus limitation in spring and during the clear‐water phase, and strong limitation for the rest of the season. The sestonic C:P ratio increased significantly during two decades of re‐oligotrophication of Lake Constance, reflecting an enhanced phosphorus limitation of the plankton community in summer. Molar C:P ratios of bacteria and phytoplankton varied seasonally between 50:1 and 130:1 and 180:1 and 500:1, respectively, and indicate carbon or light limitation in winter and phosphorus limitation in summer. Zooplankton had a molar C:P ratio of about 124:115 which was nearly constant throughout the seasons. These differences in the C:P ratios of planktonic organisms have direct implications for phosphorus recycling within the food web as C:P ratios of excreta should be highly variable.

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Section: Discussionmentioning

confidence: 99%

Seasonal changes of C:P ratios of seston, bacteria, phytoplankton and zooplankton in a deep, mesotrophic lake

Hochstädter

2000

Freshwater Biology

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“…A probable exposure time of 1 day is not practical in many cases because of inadequate catches or other limitations. However, if we consider the fast mineralization rates of phytoplankton [184,185] as well as of zooplankton [190][191][192], with a phosphorus release of >-70% within 1 day, and moreover assume mean sinking velocities of >-1 to 4 m/day in the epilimnetic layer of a lake, it is likely that a large portion of the dead cells have already lost most of their phosphorus before they reach a trap set at the lower boundary of the epilimnion. Thus only the more refractory components (partly nitrogen, organic carbon) will be collected in the hypolimnetic layers and affected by bacterial breakdown.…”

Section: The Problem Of Artificial Mineralization (Preservatives Expmentioning

confidence: 99%

A critical review of sedimentation trap technique

Bloesch

Burns²

1980

Schweiz. Z. Hydrologie

311

240

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The published literature on the use of sediment traps has been reviewed and used to validate the conclusions of a theoretical analysis of the physical factors affecting the trapping of particles. Both practical and theoretical considerations lead us to recommend that the 'best' sediment trap for use in limnology is a simple cylinder with a diameter of from 5 to 20 cm and aspect ratio (ratio of length to diameter) of greater than 5 for small lakes and greater than 10 for more turbulent water bodies. We also demonstrate the need to know the approximate particle Reynolds number of particles being collected by sediment traps. A number of considerations lead us to advise against the use of collars, lattices, baffles, lids or reference chambers. Recommendations are made on minimizing the unresolved problem of mineralization of organic material and on optimum length of exposure times, mooring systems, trap holding frames and sample handling.

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Sedimentationsvorgänge im Stechlinseegebiet

Mothes¹

1977

Acta hydrochim. hydrobiol.

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Zuaamnzenfaaaung:Mittels Sedimentfiingern wird die Sedimentation im Stechlinsee, Nehmitzsee und Dagowsee an verschiedenen Stationen und in verschiedenen Tiefen vergleichend untersucht. Neben der Trockenmasse wird vor allem der Phosphorgehalt sowie das C: N: P -Verhiiltnis dargestellt. Fur das Phosphat als limitierenden Faktor der Primiirproduktion wird eine Bilanz der euphotischen Zone &us der GesamtPnderung der Phosphorkonzentration und der Sedimentation anfgestellt, &us der Phosphorspeicherung und -ffeisetzung des Sedimentes abzulesen sind. Die Auswirkungen auf die Sanierungsmoglichkeiten und -malnahmen werden diskutiert, EinleitungIm Stechlinseegebiet durchgefuhrte Komplexuntersuchungen konzentrieren sich auf die Erforschung der Stoffdynamik in der euphotischen Zone. Fur die Abschiitzung einzelner Leistungen genugen Bilanzierungen. Die Bilanzen lessen sich spiiter in Modellen verkniipfen.Eine einfache Summenbilanz entsprechend AVLENBACH und CLESCEBI liegt auch fur das Phosphat im Stechlinsee vor (MOTRES 197413). Eine detaillierte Analysb gestattet fiir die Sedimentation hinsichtlich einer spiiteren Modellierung spezifischere Fragen wie nach dem Jahresrhythmus der Sedimentat,ion, den Beziehungen zum Sestongehalt, dem Verhiiltnis von Leistung und Zusammensetzung der Conose in der euphotischen Zone zur Sedimentation, den Beziehungen zwischen hypolimnischem Niihrstoffhaushalt und den Abbauvorgiingen wiihrend der Sedimentation wie auch denen im Sediment, der Niihrstoffversorgung der euphotischen Zone und ihrer Auswirkung auf die sedimentierende Substanz.Diese Fragen werden beantwortet, wobei der Phosphor als die Algenproduktion begrenzender Faktor im Mittelpunkt der Darstellung steht. Eine ausfuhrlichere Darstellung wird in Limnologica erscheinen. M ethodikDie Sedimentationsbehlilter (Abb. 1) vom Typ OHLE (aus EDMONDSON und WINBERO) wurden paarweise in 14-tiigigem Rhythmus exponiert. Die chemische Aufarbeitung des Materials entaprach den Angaben bei MOTHES (1974a). Die Kohlenstoff-und Stickstoffanalysen erfolgten nach einer Mikroverbrennungsmethode im i Vortrag, gehalten auf dem Symposium ,,Suspendiertes Material in Binnen-und Klistengew&ssern", Reinhardsbrunn, Oktaber 1975.

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Abbau organischer Phosphorkomponenten aus totem S��wasser-Zooplankton

Cited by 6 publications

References 7 publications

Seasonal changes of C:P ratios of seston, bacteria, phytoplankton and zooplankton in a deep, mesotrophic lake

Seasonal changes of C:P ratios of seston, bacteria, phytoplankton and zooplankton in a deep, mesotrophic lake

A critical review of sedimentation trap technique

Sedimentationsvorgänge im Stechlinseegebiet

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