Coupling of phytoplankton and detritus in a shallow, eutrophic lake (Lake Loosdrecht, The Netherlands)

Gons, Herman J.; Burger-Wiersma, Tineke; Otten, Jerko H.; Rijkeboer, Machteld

doi:10.1007/978-94-011-2432-4_5

Cited by 16 publications

(6 citation statements)

References 23 publications

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“…), carried out at the same time with the Hyperion and ALI image acquisition. It was assumed that the concentration of suspended matter is the sum of nonchlorophyllous and organic particles and the relationship by Gons et al (1992), where 1 mg m Ϫ3 chlorophyll is approximately equal to 0.07 mg L Ϫ1 of suspended matter, was used to estimate the C SM . The nonchlorophyllous suspended matter concentration was taken to be 2 mg L Ϫ1 , and a CDOM (400) ϭ 0.71 m Ϫ1 .…”

Section: Methodsmentioning

confidence: 99%

Quantitative detection of chlorophyll in cyanobacterial blooms by satellite remote sensing

Kutser

2004

Limnology & Oceanography

333

199

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The extent of cyanobacterial blooms has been mapped using different satellite sensors from weather satellites to synthetic aperture radars. Quantitative detection of chlorophyll in cyanobacterial blooms by remote sensing, however, has been less successful. The first civilian hyperspectral sensor in space, Hyperion, acquired an image of cyanobacterial bloom in the western part of the Gulf of Finland on 14 July 2002. A chlorophyll concentration map was produced from this image using a spectral library that was created by running a bio-optical model with variable concentrations of chlorophyll. The results show that chlorophyll concentrations in the bloom area were much higher than reported by conventional water-monitoring programs, ships-of-opportunity, and satellite measurements. The reason why both in situ and satellite methods underestimate the amount of phytoplankton during cyanobacterial blooms is vertical and horizontal distribution of cyanobacteria, because cyanobacteria can regulate their buoyancy and are not uniformly distributed within the top mixed layer of water column in calm weather conditions. Aggregations of cyanobacteria form dense subsurface blooms and surface scums during extensive blooms. This study demonstrates that it is difficult to collect representative water samples from research vessels using standard methods because ships and water samplers destroy the natural distribution of cyanobacteria in the sampling process. Flowthrough systems take water samples from the depths at which the concentration of cyanobacteria is not correlated with the amount of phytoplankton that remote sensing instruments detect. The chlorophyll estimation accuracy in cyanobacterial blooms by many satellites is limited because of spatial resolution, as significant changes in chlorophyll concentration occur even at a smaller spatial scale than 30 m.

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Section: Methodsmentioning

confidence: 99%

Quantitative detection of chlorophyll in cyanobacterial blooms by satellite remote sensing

Kutser

2004

Limnology & Oceanography

333

199

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“…Several field studies have demonstrated that in oligotrophic lakes, C:P ratios of seston are commonly higher than TER (Hessen and Faafeng, 2000;Hecky et al 1993;Elser et al 2001). In many lakes, detritus is the dominant sestonic fraction (Gons et al 1992;Hessen et al 2003), and a high share of detritus is expected to increase the overall C:P ratio of the seston. In general, only a minor fraction of seston mass in lakes are composed of live phytoplankton cells, and estimated C:P ratio of seston was found to be 2.7 times higher than that for phytoplankton .…”

Section: Observations In Lakesmentioning

confidence: 97%

Re-oligotrophication by phosphorus reduction and effects on seston quality in lakes

Donk¹,

Hessen²,

Verschoor³

et al. 2008

Limnologica

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We review published data of re-oligotrophication studies in different types of lakes and discuss whether reoligotrophication by phosphorus reduction measures can affect seston quality in lakes due to an increase in C:P ratios of food for zooplankton. We analyze whether such an increase in elemental ratio may give rise to a stoichiometric constraint or bottleneck for regulation of phytoplankton by zooplankton and thus cause a decrease in trophic transfer efficiency.Because seston C:P ratios of seston tend to decrease with increasing P concentration in lakes, i.e. by increasing eutrophication, the reverse may be true, i.e. the C:P ratio of the seston will increase when lakes become reoligotrophicated by P reduction. This may imply lower food quality for P-demanding seston grazers, like Daphnia, which have both relatively low C:P ratios and are quite homeostatic with regard to C:P ratios. Consequently, the reduced grazer biomass may lead to lower grazing pressure on the phytoplankton and may result in lower trophic transfer efficiency. On the other hand, oligotrophication commonly leads to improved food quality in terms of composition of the phytoplankton community, e.g. increase of mixotrophs and reduced share of cyanobacteria. These two qualitative traits of seston (higher C:P ratios and change in phytoplankton composition) may thus work in opposite directions during re-oligotrophication.Most investigated lakes -both deep and shallow -responded by improvement in underwater light climate due to reduction of P loadings. Several compensatory mechanisms prevented the occurrence of a stoichiometric bottleneck for top-down control. From a few documented cases of both deep and shallow lakes, where seston stoichiometry, the presence of Daphnia and the trophic transfer efficiency were concurrently measured during the process of reoligotrophication, we may conclude that the anticipated increase in C:P ratios of the seston is not straightforward. It depends on lake-specific properties such as morphometry, water residence time, water temperature and trophic structure. A stoichiometric bottleneck is only likely to occur during summer in (1) the epilimnion of small deep and stratified lakes with a long water residence time and low mixing regime, and (2) shallow lakes with high C:P ratios caused by a relatively high detritus content of seston and/or grazing resistant algae, like colony forming cyanobacteria.

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“…TSS minus ISS yields OSS. According to the method in [16], it can be estimated that a chlorophyll-a concentration of 1 mg m −3 is approximately equal to 0.12 g m −3 TSS in Lake Kasumigaura [17], from which the concentration of phytoplanktonic suspended solids (PSS) can be derived. Concentrations of tripton (i.e., nonphytoplanktonic suspended solids) were then calculated by subtracting PSS from TSS.…”

Section: Data Collectionmentioning

confidence: 99%

A Modified Semianalytical Algorithm for Remotely Estimating Euphotic Zone Depth in Turbid Inland Waters

Yang

Matsushita

Yoshimura

et al. 2015

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Euphotic zone depth (Zeu), defined as the depth where photosynthetic available radiation (PAR) is 1% of its surface value, is of great importance in studies of water biogeochemical processes. Satellite remote sensing is a powerful technique to obtain Zeu, as it can cover large areas at very frequent intervals. Several remote-sensing algorithms for estimating Zeu have been developed for oceanic water bodies; however, remote estimation of Zeu is still a challenging task for inland waters. In this study, an existing semianalytical algorithm (named as Lee07 in this study) was modified for remotely estimating Zeu in turbid inland waters by replacing the original quasi-analytical algorithm (QAA) by QAA_Turbid, an algorithm specially developed for remotely estimating total absorption and backscattering coefficients in turbid waters. Performance of the modified algorithm was evaluated using in situ radiometric data collected in Japan's Lake Kasumigaura, known to be turbid. Results showed that yielded acceptable estimation accuracy for Z eu (ranging from 1.15 to 2.26 m) with root-mean-square error (RMSE) of 0.12 m, normalized root-mean-square error (NRMS) of 8.01%, and mean normalized bias (MNB) of −1.84%, significantly outperforming the original version as well as three other Zeu retrieval algorithms. These results indicate its great potential for accurately estimating Zeu over widespread turbid inland waters from satellite images.

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Coupling of phytoplankton and detritus in a shallow, eutrophic lake (Lake Loosdrecht, The Netherlands)

Cited by 16 publications

References 23 publications

Quantitative detection of chlorophyll in cyanobacterial blooms by satellite remote sensing

Quantitative detection of chlorophyll in cyanobacterial blooms by satellite remote sensing

Re-oligotrophication by phosphorus reduction and effects on seston quality in lakes

A Modified Semianalytical Algorithm for Remotely Estimating Euphotic Zone Depth in Turbid Inland Waters

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