Living in a browning environment: Effects on <i>Daphnia</i>’s growth and fatty acid pattern

Nova, Clarice Casa; Bozelli, Reinaldo Luiz; Spitzy, Alejandro; Müller-Navarra, Dörthe C.

doi:10.1002/lno.11016

Cited by 17 publications

(6 citation statements)

References 77 publications

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“…They also suggest that Daphnia reared at 12°C versus 20°C may not be nutritionally very different to Chaoborus . Previous studies have shown that Daphnia fatty acid profiles mimic those of their diet, and also that Daphnia can synthesize a small fraction of PUFA de novo (Gladyshev et al., 2016; Nova et al., 2019). Chaoborus americanus have a 1‐year life cycle and they remain in larval form from late summer to the following spring (Fedorenko & Swift, 1972).…”

Section: Discussionmentioning

confidence: 99%

Cascading effects of algal warming in a freshwater community

et al. 2021

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Research on the effects of climate warming on ecological communities has focused on how temperature affects resource quantity. However, resource quality is also affected by warming, and changes in resource quality can have meaningful effects on the productivity of higher trophic levels. Aquatic communities in particular experience temperature‐mediated shifts in resource quality because the nutritional value of algae is highly sensitive to temperature. For example, the production of healthful omega‐3 polyunsaturated fatty acids (n‐3 PUFA) by algae often decreases with warming. Decreased levels of some algal PUFAs with warming have led to the hypothesis that global warming should lead to an overall decrease in productivity in aquatic communities. However, this hypothesis: (a) potentially oversimplifies the relationship between algal PUFAs and temperature, and (b) assumes that the nutritional requirements of consumers are not affected by temperature. Here, we test these assumptions using a freshwater community (Scenedesmus algae, Daphnia zooplankton, Chaoborus insects). Warming temperatures increased total algal PUFAs, but decreased algal cell size, resulting in no net effect of temperature on PUFA per algal cell. In contrast, quantities of algal neutral lipids decreased with warming. At the consumer level, Daphnia fed 12°C‐reared algae maintained higher population sizes than those fed 20°C or 28°C‐reared algae. However, the effect of algal food type diminished as Daphnia rearing temperature increased. The indirect effects of cold‐reared algae on the growth rate of Chaoborus predators were minor. These data highlight the importance of investigating the effects of temperature on both resource quality and on the nutritional needs of consumers. Our results suggest that at warmer temperatures, consumer nutritional requirements may be reduced. We caution against broad claims that the negative relationship between some algal PUFAs and temperature should result in overall declines in aquatic productivity with ongoing climate warming. A free Plain Language Summary can be found within the Supporting Information of this article.

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Section: Discussionmentioning

confidence: 99%

Cascading effects of algal warming in a freshwater community

et al. 2021

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“…Contrary to our expectations, DOC had no effects on hatching patterns when in direct contact with resting eggs. DOC is acknowledged to directly affect several life history parameters of cladocerans, as HS may be taken up by organisms and interact with biochemical constituents and signaling pathways (Steinberg et al, 2006;Suhett et al, 2011;Nova et al, 2018). Additionally, DOC may dye the body surface of cladocerans turning them darker.…”

Section: Discussionmentioning

confidence: 99%

Hatching Under Brownification: DOC-Mediated Changes in Physical, but Not Chemical Properties of Water Affect Hatching Patterns of Cladocera Resting Eggs

Vargas¹,

Santangelo²,

Bozelli³

2021

Preprint

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Dissolved organic carbon (DOC) is often related to the brownification of water in continental aquatic systems and to changes in the physiology of zooplankton organisms. Zooplankton resting eggs are particularly sensitive to changes in light and chemical characteristics of water, but the physical and chemical effects associated to DOC on dormant stages have never been tested before. Herein we tested how DOC affects hatching rates and time to hatching of Cladocera (Diaphanosoma birgei) resting eggs. In order to analyze the chemical (i.e. toxic) and physical (i.e. light attenuation) effects of DOC on hatching patterns, resting eggs were exposed to different concentrations of DOC in an experimental design which isolated chemical from physical effects. We observed higher hatching rates and lower time to hatching at intermediate DOC concentrations. DOC effects on hatching mainly relied on light attenuation, while chemical effects were likely of minor importance. We conclude that DOC may change Cladocera emergence patterns mainly through light attenuation in the water column.

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“…Organic carbon (OC) concentrations and water colour have been reported to increase in surface waters in the boreal and nemoral zones of Europe and North America. This so-called "brownification" of water bodies can affect aquatic food web structures [17,18], have implications for drinking water treatment [19,20], and mobilize pollutants and metals attached to organic molecules [21,22]. Land use activities, such as forest harvest and peatland drainage, have been found to increase the concentrations and loads of DOC in surface waters (e.g., [4,[23][24][25]).…”

Section: Introductionmentioning

confidence: 99%

Carbon, Nutrients and Methylmercury in Water from Small Catchments Affected by Various Forest Management Operations

Kļaviņa

Bārdule

Eklöf

et al. 2021

Forests

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Forest management activities in boreal and hemiboreal environments have been found to increase the concentration of carbon, nutrients, and methylmercury (MeHg) in runoff water, thus contributing to environmental quality issues. We evaluated carbon, nutrient, and MeHg concentrations in water at eight small, forested catchments on organic soils in Latvia, subject to ditch cleaning and beaver dam removal. These management-induced disturbances were classified into a major, minor, or no disturbance classes. The concentrations of dissolved organic carbon and total nitrogen were elevated in disturbed catchments (both major and minor) compared to the catchments with no disturbance. The concentrations of MeHg in the water displayed a clear seasonal variation with higher concentrations in spring and summer, but there were no significant differences in MeHg concentrations between catchments with major, minor, and no disturbances. However, the higher concentrations of SO42− in the disturbed catchments compared to those undisturbed may promote MeHg formation if the conditions become more reduced further downstream. While most former studies of forest management effects on water quality have focused on forest harvest, our research contributes to the currently rather scarce pool of data on the impact of less-studied management operations, such as ditch cleaning and beaver dam removal, on carbon, nutrient, and MeHg concentrations in runoff water.

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Living in a browning environment: Effects on Daphnia’s growth and fatty acid pattern

Cited by 17 publications

References 77 publications

Cascading effects of algal warming in a freshwater community

Cascading effects of algal warming in a freshwater community

Hatching Under Brownification: DOC-Mediated Changes in Physical, but Not Chemical Properties of Water Affect Hatching Patterns of Cladocera Resting Eggs

Carbon, Nutrients and Methylmercury in Water from Small Catchments Affected by Various Forest Management Operations

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