Vertical distribution of zooplankton in a shallow peatland pond: the limiting role of dissolved oxygen

Vad, Csaba F.; Horváth, Zsófia; Kiss, Keve Tihamér; Tóth, Bence; Péntek, Attila L.; Ács, Éva

doi:10.1051/limn/2013060

Cited by 17 publications

(13 citation statements)

References 54 publications

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“…The projected increase would have profound implications for physical parameters such as stratification, mixing, thermocline depth in lakes which in turn impact many biological and chemical parameters, such as distribution of nutrients [43,44], phytoplankton [45], zooplankton communities and composition [44,46], microbial communities [46], exchange of dissolved gasses with the atmosphere [47] and ecosystem metabolism [27]. In turn these processes determine availability of dissolved oxygen and finally what parts of the water column can be utilized by zooplankton [48] and fishes [49]. Because of the projected increases in storm frequency and intensity, understanding and quantifying the effects of storms on lake physics has now become important.…”

Section: Discussionmentioning

confidence: 99%

13 Years of Storms: An Analysis of the Effects of Storms on Lake Physics on the Atlantic Fringe of Europe

Andersen

Eyto

Dillane

et al. 2020

Water

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While winter storms are generally common in western Europe, the rarer summer storms may result in more pronounced impacts on lake physics. Using long-term, high frequency datasets of weather and lake thermal structure from the west of Ireland (2005 to 2017), we quantified the effects of storms on the physical conditions in a monomictic, deep lake close to the Atlantic Ocean. We analysed a total of 227 storms during the stratified (May to September, n = 51) and non-stratified (November to March, n = 176) periods. In winter, as might be expected, changes were distributed over the entire water column, whereas in summer, when the lake was stratified, storms only impacted the smaller volume above the thermocline. During an average summer (May–September) storm, the lake number dropped by an order of magnitude, the thermocline deepened by an average of 2.8 m, water column stability decreased by an average of 60.4 j m−2 and the epilimnion temperature decreased by a factor of five compared to the average change in winter (0.5 °C vs. 0.1 °C). Projected increases in summer storm frequency will have important implications for lake physics and biological pathways.

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Section: Discussionmentioning

confidence: 99%

13 Years of Storms: An Analysis of the Effects of Storms on Lake Physics on the Atlantic Fringe of Europe

Andersen

Eyto

Dillane

et al. 2020

Water

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“…Hence, the bottom‐water layer had its own plankton dynamics developed without the effects of hydrology. Such result suggests the importance of lake depth as a source of variability (Palijan, ; Segovia et al, ; Vad et al, ).…”

Section: Discussionmentioning

confidence: 98%

“…The importance of cladocerans and copepods intensifies with the increasing stability of hydrological conditions (Keckeis et al, ) during which microcrustaceans dominantly graze nanoplankton size component. Planktonic interactions at the bottom‐water layer have, however, been poorly investigated (Palijan, ; Segovia, Pereira, Bini, & Velho, ; Vad et al, ).…”

Section: Introductionmentioning

confidence: 99%

Effect of depth on food‐web interactions in a thermally stratified floodplain lake following inundation

Palijan

Balkić

2018

River Research & Apps

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We investigated the controlling mechanisms of microbial and metazooplankton food-web components at the surface-and bottom-water layers of a thermally stratified floodplain lake (Lake Sakadaš, Kopački Rit floodplain, Croatia) during its connection with the river. Throughout the study, the lake was stratified continuously. The permutational multivariate analysis of variance provided evidence that only the surface-water layer was impacted on by the flow and flood pulses, whereas the bottom-water layer represented a zone of stable environmental conditions. The water depth was by one order of magnitude more important in determining environmental variables and plankton abundance than the hydrological phases. Under such circumstances, path analysis provided evidence that the planktonic food-web interactions were strongly influenced by the sample layer, regardless of the flooding conditions. The transfer of organic matter to higher trophic levels at the surface was dominated by herbivory and, to a lesser extent, by predation, whereas bottom-water layer was represented by additional routes (bacterivory and omnivory).The transfer of organic matter was different through the investigated water layers, of which the surface-water layer was additionally structured by the floodplain hydrology.

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“…In contrast, in the shallow waters and wetlands that are ecologically important and can spatially dominate freshwater ecosystems (Downing et al, 2006;Feuchtmayr et al, 2009), oxygen may become fully depleted or reduced for extended periods (weeks), except for a few centimetres at the interface (e.g. Luo, 2002;Moran et al, 2010;Vad et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Cumulative effects matter: multi‐brood responses of Daphnia to hypoxia

et al. 2016

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Summary Periods of hypoxia lasting up to weeks are now anticipated in fresh waters, owing to anthropogenic influences. However, the cumulative effects of hypoxia on Daphnia, over multiple broods, have received virtually no attention, and to establish and evaluate such responses there is a need to make measurements over a wide range of oxygen concentrations, potentially revealing non‐linear patterns. We predict that the effect of hypoxia on growth, survival and fecundity (i.e., production of new individuals) of Daphnia will increase over multiple broods, and with increasing oxygen these responses will approach asymptotic maxima, following a rectangular hyperbolic response. Daphnia similoides were exposed to 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 and 8.0 mg oxygen L−1. To determine effects on the first brood we examined: number of offspring; time to the first eggs; time to the first brood and size of the female at the first eggs and the first brood. To determine cumulative effects of oxygen over multiple broods (up to 8 broods over 21 days), we measured: total number of offspring produced by a female; survival time and total number of moults and broods. To investigate how the cumulative effects arose over the multiple broods, we examined the number of offspring per brood in each brood over eight broods. To assess treatment effects and indicate responses, functions were fit to data using the most parsimonious function that reflected trends in the data. Measurements associated with a single brood responded linearly, or not at all, with changing oxygen concentration, whereas measurements made over the 21 days followed a rectangular hyperbolic response, increasing to an asymptote as oxygen increased. For the first brood, as oxygen concentration was raised from 1 to 8 mg L−1 the number of offspring produced and the time required to produce the brood were not affected; the time required to produce eggs decreased ˜0.3‐fold; and the size of individuals at the time when the eggs and the brood were produced increased ˜0.1‐fold. Over the 21 days, between 1 and 8 mg L−1 the total number of offspring increased ˜3.4‐fold; individual survival and the number of moults increased ˜2‐fold, and the number of broods increased ˜1‐fold. For single‐brood responses, there was no effect of decreasing oxygen levels on the number of offspring in the first brood, but there were negative effects on the second‐to‐fourth broods; the number of offspring in the remaining broods was not significantly related to oxygen levels, as there were fewer data at low levels due to poor survival. We conclude that assessments of Daphnia demographics should not rely on estimates of the effect of oxygen concentration on single broods. Instead, studies should consider cumulative changes over multiple broods. Following our approach, researchers may now explore the impacts of hypoxia on congeners and other zooplankton, and investigate the mechanisms associated with multi‐brood responses.

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Vertical distribution of zooplankton in a shallow peatland pond: the limiting role of dissolved oxygen

Cited by 17 publications

References 54 publications

13 Years of Storms: An Analysis of the Effects of Storms on Lake Physics on the Atlantic Fringe of Europe

13 Years of Storms: An Analysis of the Effects of Storms on Lake Physics on the Atlantic Fringe of Europe

Effect of depth on food‐web interactions in a thermally stratified floodplain lake following inundation

Cumulative effects matter: multi‐brood responses of Daphnia to hypoxia

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