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

Hochstädter, Silke

doi:10.1046/j.1365-2427.2000.00597.x

Cited by 42 publications

(46 citation statements)

References 37 publications

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“…The P-content of zooplankton found in this study and the estimated molar C:P ratios above confirmed that this community had lower phosphorus levels than most temperate zooplankton (Hessen, 1990;Hessen & Lyche, 1991). In the lake Constance (Germany), for example, the molar C:P ratios for zooplankton range usually between 45 and 65 (Hochstädter, 2000). Even considering the fact that these C:P ratios were not estimated at the species level, the higher values found in the present study can be seen as evidence of the limiting role of phosphorus for zooplankton in Pampulha reservoir.…”

Section: Anovacontrasting

confidence: 61%

“…In the last two decades, experimental and empirical evidence supporting the theory of elemental homeostasis (C, N, and P) in zooplankton have been published (Sterner et al, 1992). This theory is mostly based on the fact that the variation of elemental composition (C, N, and P) found in zooplankton biomass is lower than the variation observed in phytoplankton or seston particles (Hochstädter, 2000). This pattern indicates the possible existence of homeostasis in the elemental composition of zooplankton.…”

Section: Introductionmentioning

confidence: 99%

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The nutritional status of zooplankton in a tropical reservoir: effects of food quality and community structure

et al. 2005

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The temporal variability of energetic reserves of zooplankton in the eutrophic Pampulha reservoir was investigated during two successive annual cycles. The effects of dominance of large filter-feeding cladocerans (Daphnia) and the occurrence of massive blooms of the cyanobacteria Microcystis on the energetic reserves of zooplankton were tested. This study showed that phytoplankton composition has a greater effect on energetic reserves of zooplankton. Some associations between lipid levels and the specific composition of zooplankton were also found. This study also demonstrated that the elementary composition of phosphorus in zooplankton can be used as an estimator of the nutritional status of zooplankton.

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Section: Anovacontrasting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

The nutritional status of zooplankton in a tropical reservoir: effects of food quality and community structure

et al. 2005

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“…Beyond edibility inferred from morphology, algal food quality was not measured continuously in Lake Constance, which prevented further analyses of this potentially influential factor on bottom-up control of ciliates. However, the share of ciliate species that supplement their algivorous diet with P-rich bacteria or other zooplankton increased from spring to summer, which may be attributed to pronounced Pdepletion in phytoplankton during summer, yielding P-deficiency in purely algivorous consumers (Hochstädter 2000, Gaedke et al 2002. In addition, bacterivores increased relative to algivores during summer as re-oligotrophication progressed: From July to • September the contribution of Cluster 7, which was largely made up of small scuticociliates known to feed mainly on picoplankton (2imek et al 1994, 1995), increased from an average of 0.4% from 1987 to 1993 to 3% in the 5 yr thereafter.…”

Section: Discussionmentioning

confidence: 99%

Ciliate dynamics in response to changing biotic and abiotic conditions in a large, deep lake (Lake Constance)

Gaedke¹,

Wickham²

2004

Aquat. Microb. Ecol.

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From 1987 to 1998, ciliates and their prey and predator communities in Lake Constance (which is large, deep and meso-eutrophic) were intensively studied as the lake underwent reoligotrophication. Ciliate biomass exhibited the bimodal seasonal distribution typical for mesoeutrophic lakes, with high biomass in spring and summer and low biomass in winter and during the clear-water phase. Cluster analysis produced 9 groups of temporally co-occurring ciliate morphotypes with potentially similar ecological characteristics. The clusters exhibited a larger seasonality than found in the size distribution, showing that size alone failed to capture some ciliate seasonal dynamics. Ciliate biomass declined by approx. 30% during the 12 yr of study, i.e. considerably less than daphnids (and total phosphorus). This yielded a significant increase in the ratio between summer ciliate and daphnid biomass as re-oligotrophication progressed, in contrast to previous studies. Few indications for a mechanistic link between phosphorus concentrations (which declined 3-fold during the study period) and ciliate biomass or community composition via group-specific food concentrations were found. The relative contribution of 3 of the 9 clusters changed as re-oligotrophication progressed. Ciliate size distribution was related to re-oligotrophication and daphnid biomass in summer. The smallest and largest ciliates gained importance when daphnids decreased, whereas the biomass of large ciliates declined. Generally, summer daphnid biomass had a greater predictive power for attributes of the ciliate community than the other factors studied (phosphorus, prey biomass, copepod biomass). The extent of bottom-up and top-down control of ciliates appeared to be time-and groupspecific. Overall, the ciliate community exhibited remarkably recurrent seasonal patterns, despite major alternations in abiotic and biotic conditions. KEY WORDS: Ciliates · Long-term observations · Bottom-up control · Top-down control · Eutrophication · Daphnids · Copepods Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 34: [247][248][249][250][251][252][253][254][255][256][257][258][259][260][261] 2004 ton) may be closely linked and subject to external forcing by climate and nutrient changes.In Lake Constance, which is large, deep and mesoeutrophic, intensive investigations of the planktonic ciliate community revealed recurrent seasonal patterns in ciliate abundances and taxonomic community composition from 1987to 1989(Müller 1989. Biomass peaks developed in early spring immediately after the onset of phytoplankton growth, and in summer/autumn after the clear-water phase, during which time ciliate biomass was low. In spring, small algivorous ciliates such as Balanion planctonicum were typical, while the summer community was characterized by a somewhat higher variability in taxonomical composition and feeding types (Müller 1989. Laboratory studies provided insight into ciliate ingestion and production rates, preferred algal...

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“…The high phosphorus demand of aquatic bacteria is reflected by their relatively low biomass C:P ratios (8 to 173:1 by moles; Chrzanowski et al 1996, Hochstadter 2000, Vrede et al 2002. In contrast, water-column ratios of DOC:DOP are typically much higher (400 to 800:1 by mol; Hopkinson et al 1997, McKnight et al 1997).…”

Section: Bacterial Metabolism On Different Dom Sourcesmentioning

confidence: 99%

“…However, the predicted values generated from our multiple regression analyses represent unbiased esti- Table 3) declined exponentially with C:P ratio of different DOM sources. Shaded area: range of C:P ratio of aquatic bacterial biomass reported in the literature (Chrzanowski et al 1996, Hochstadter 2000, Vrede et al 2002 Aquat Microb Ecol 39: [107][108][109][110][111][112][113][114][115][116][117][118][119] 2005 mates of BP and BR. A slightly different pattern emerged when we estimated BGE from predicted instead of observed BP and BR.…”

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confidence: 99%

Source and supply of terrestrial organic matter affects aquatic microbial metabolism

Lennon

Pfaff²

2005

Aquat. Microb. Ecol.

134

118

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Aquatic ecosystems are connected to their surrounding watersheds through inputs of terrestrial-derived dissolved organic matter (DOM). The assimilation of this allochthonous resource by recipient bacterioplankton has consequences for food webs and the biogeochemistry of aquatic ecosystems. We used laboratory batch experiments to examine how variation in the source and supply (i.e. concentration) of DOM affects the productivity, respiration and growth efficiency of heterotrophic lake bacterioplankton. We created 6 different DOM sources from soils beneath nearmonotypic tree stands in a temperate deciduous-coniferous forest. We then exposed freshwater microcosms containing a natural microbial community to a 1100 µM supply gradient of each DOM source. Bacterial productivity (BP) and bacterial respiration (BR) increased linearly over the broad gradient, on average consuming 7% of the standing pool of dissolved organic carbon (DOC). Bacterial metabolism was also influenced by the chemical composition of the DOM source. Carbon-specific productivity declined exponentially with an increase in the carbon:phosphorus (C:P) ratio of the different DOM sources, consistent with the predictions of ecological stoichiometry. Together, our shortterm laboratory experiments quantitatively describe the metabolic responses of freshwater bacterioplankton to variation in the supply of terrestrial-derived DOM. Furthermore, our results suggest that dissolved organic phosphorus (DOP) content, which may be linked to the identity of terrestrial vegetation, is indicative of DOM quality and influences the productivity of freshwater bacterioplankton.KEY WORDS: Allochthonous · Bacteria · DOC · DOM · Ecosystem · Plankton · Stoichiometry · Subsidy Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 39: [107][108][109][110][111][112][113][114][115][116][117][118][119] 2005 decoupled from local primary productivity. One potential explanation for this decoupling is that bacterial carbon demand is subsidized by terrestrial-derived DOM.Terrestrial ecosystems export large quantities of DOM to inland, estuarine and coastal marine waterbodies (Goni et al. 1997, Findlay et al. 1998, Neff & Asner 2001. However, terrestrial-derived DOM has traditionally been considered a poor-quality resource for aquatic bacteria because it is relatively old (Raymond & Bauer 2001) and comprises humic compounds with low nutritional content (McKnight & Aiken 1998). Nevertheless, a few lines of evidence indicate that bacterial metabolism may be supported to varying degrees by inputs of terrestrial DOM. First, numerous laboratory studies have directly demonstrated that aquatic bacteria grow on terrestrial fractions of DOM (Tranvik 1988, Bano et al. 1997, Moran & Hodson 1994. Second, as lake DOM concentrations increase, community respiration tends to exceed local primary productivity (Hanson et al. 2003), suggesting that allochthonous carbon may be consumed by heterotrophic bacteria. Third, experimental isotope-enrichment of...

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

Cited by 42 publications

References 37 publications

The nutritional status of zooplankton in a tropical reservoir: effects of food quality and community structure

The nutritional status of zooplankton in a tropical reservoir: effects of food quality and community structure

Ciliate dynamics in response to changing biotic and abiotic conditions in a large, deep lake (Lake Constance)

Source and supply of terrestrial organic matter affects aquatic microbial metabolism

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