Effects of water browning on freshwater biodiversity: the case of the predatory phantom midge Chaoborus nyblaei

Lindholm, Markus; Eie, Martin; Hessen, Dag O.; Johansen, Joachim Tørum; Weiby, Kristoffer; Thaulow, Jens

doi:10.1007/s10750-017-3503-x

Cited by 6 publications

(3 citation statements)

References 50 publications

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“…Oxygen deficiency is also harmful for e.g., Ephemeroptera and Plecoptera (Fochetti & Tierno De Figueroa, 2008). Some UVsensitive species, like phantom midges from the genus Chaoborus, might benefit from lake browning since it shelters them from excessive UV radiation (Lindholm et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Lake browning impacts community structure and essential fatty acid content of littoral invertebrates in boreal lakes

et al. 2021

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Many lakes in the northern hemisphere are browning due to increasing concentrations of terrestrial dissolved organic carbon (DOC). The consequences of lake browning to littoral invertebrates, however, are not fully understood. We analyzed community structure and fatty acid (FA) profiles of littoral invertebrates in humic (DOC-rich) and clear-water lakes in Eastern Finland. We found higher abundance of chironomids (Diptera: Chironomidae) in humic compared to clear-water lakes, whereas stoneflies (Plecoptera) and mayflies (Ephemeroptera: Baetidae) were more abundant in clear-water lakes. Taxon explained 65% of the differences in the FA composition of littoral invertebrates. However, the proportion and content of polyunsaturated FAs of several taxa were significantly higher in clear-water lakes compared to humic lakes. Our results reveal differences in both community structure and nutritional quality of littoral invertebrates for fish between humic and clear-water lakes.

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Section: Introductionmentioning

confidence: 99%

Lake browning impacts community structure and essential fatty acid content of littoral invertebrates in boreal lakes

et al. 2021

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“…This phenomenon, caused by increased concentrations of colored terrestrial dissolved organic carbon (DOC), and also coupled with iron interactions (Weyhenmeyer et al 2014), profoundly affects the physical and chemical environment that phytoplankton encounter (Thrane et al 2014, Seekell et al 2015. Both eutrophication and browning are known to cause alterations in biodiversity, ecosystem functioning, and energy flows in freshwater lakes (Karlsson et al 2009, Vonlanthen et al 2012, Grimm et al 2013, Lindholm et al 2018, but they also change dynamics of biochemical components in food webs, such as essential fatty acids (Müller-Navarra et al 2004, Taipale et al 2016a).…”

Section: Introductionmentioning

confidence: 99%

Eutrophication and browning influenceDaphnianutritional ecology

et al. 2019

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Climate change and land use practices can enhance lake eutrophication and browning, which influence phytoplankton composition by decreasing the availability of food high in nutritional quality (algae) and increasing the abundance of low-quality food (terrestrial detritus, bacteria) for herbivorous zooplankton. Nutritionally valuable algae for zooplankton are rich in essential biomolecules such as amino acids, polyunsaturated fatty acids (PUFA), sterols, and phosphorus. We performed laboratory experiments and showed a stronger positive relationship between zooplankton (Daphnia) cumulative offspring number and availability of high-quality algae (Cryptophytes: Rhodomonas/Cryptomonas; and Chrysophytes: Mallomonas) than with intermediate-quality (Chlorophytes: Acutodesmus) or poor-quality (Dinoflagellates: Peridinium) algae. The higher cumulative offspring number of Daphnia was a result of higher amounts of total ω-3 and ω-6 PUFA, proteins, sterols, and amino acids in the algal diets. The experiments also showed that even a small addition of high-quality algae (Rhodomonas) to intermediate-quality (Acutodesmus) or low-quality diets (bacteria, heterotrophic nanoflagellates, or terrestrial organic matter) can enhance the Daphnia cumulative offspring production. Our carbon mass balance calculation for a eutrophic clearwater lake and an oligotrophic polyhumic lake showed that the abundance of highquality phytoplankton (cryptophytes, chrysophytes, diatoms) among total particulate organic carbon was minor (8.7% [SD 2.4%] and 6.5% [7.0%]). We modeled Daphnia diets (i.e., resource assimilation) using a fatty acid mixing model. Our analyses showed that Daphnia were able to locate high-quality algae (cryptophytes, chrysophytes, and diatoms) more effectively during cyanobacteria blooms in a eutrophic lake (55% [SD 12%]) than in a polyhumic lake (25% [10%]). Nevertheless, our results show that intense eutrophication and browning diminish assimilation of high quality algae, limiting Daphnia biomass production.

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“…DOM selectively absorbs short wavelengths of radiation, such as UV-B radiation [19] which is known to include the most damaging wavelengths of light reaching the Earth's surface [20]. Therefore, the selective absorption of UV-B radiation is known to provide a refuge from exposure to UV for many aquatic organisms that have a low UV-tolerance such as the predatory aquatic larvae of the phantom midge [21], zooplankton [22], and juvenile fish [23].…”

Section: Introductionmentioning

confidence: 99%

Dissolved organic matter protects mosquito larvae from damaging solar UV radiation

et al. 2020

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Mosquitoes have increased in their abundance and geographic distribution in northeastern North America, coinciding with an increase in extreme precipitation events and up to a doubling of dissolved organic matter (DOM) concentrations in some inland waters. Increases in DOM can reduce exposure of mosquito larvae to solar ultraviolet (UV) radiation. Although mosquito larvae are most common in shaded habitats, almost nothing is known about their susceptibility to damage by solar UV radiation, or the ability of DOM to create a refuge from damaging UV in their shallow-water habitats. We hypothesize that 1) exposure to solar UV radiation is lethal to mosquito larvae, 2) larvae lack photo-enzymatic repair to fix UV-damaged DNA, and 3) DOM shades larvae from lethal solar UV radiation. We tested these hypotheses with experiments that manipulated UV radiation, the photo-repair radiation necessary for photo-enzymatic DNA repair, and DOM. Exposure to solar UV radiation significantly decreased larval survivorship, while DOM significantly increased it. There was no evidence of photo-enzymatic DNA repair. Our findings confirm that solar UV radiation decreases habitat suitability for mosquito larvae, but DOM provides a refuge from UV. This highlights the need for vector control managers to prioritize high DOM and shaded habitats in their efforts to reduce mosquito populations.

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Effects of water browning on freshwater biodiversity: the case of the predatory phantom midge Chaoborus nyblaei

Cited by 6 publications

References 50 publications

Lake browning impacts community structure and essential fatty acid content of littoral invertebrates in boreal lakes

Lake browning impacts community structure and essential fatty acid content of littoral invertebrates in boreal lakes

Eutrophication and browning influenceDaphnianutritional ecology

Dissolved organic matter protects mosquito larvae from damaging solar UV radiation

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