Water abstraction in small lowland streams: Unforeseen hypoxia and anoxia effects

Pardo, Isabel; García, Liliana

doi:10.1016/j.scitotenv.2016.05.218

Cited by 48 publications

(28 citation statements)

References 60 publications

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“…It is evident that complete channel drying has catastrophic effects on aquatic communities 7 ; however, the more widespread effect of drought observed here was the emergence of stagnant surface streams that remained hypoxic or anoxic for days or even weeks during summer 2018. Depending on their severity and duration, these low O 2 events can be lethal to many aquatic taxa, leading to reductions in overall biodiversity, and shifts in the composition of stream communities 61,62 . A host of unanswered questions remain regarding the impact of severe drought on high-latitude aquatic communities, including the mechanisms and timescales over which different taxonomic groups may recover.…”

Section: Resultsmentioning

confidence: 99%

Drought alters the biogeochemistry of boreal stream networks

et al. 2020

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Drought is a global phenomenon, with widespread implications for freshwater ecosystems. While droughts receive much attention at lower latitudes, their effects on northern river networks remain unstudied. We combine a reach-scale manipulation experiment, observations during the extreme 2018 drought, and historical monitoring data to examine the impact of drought in northern boreal streams. Increased water residence time during drought promoted reductions in aerobic metabolism and increased concentrations of reduced solutes in both stream and hyporheic water. Likewise, data during the 2018 drought revealed widespread hypoxic conditions and shifts towards anaerobic metabolism, especially in headwaters. Finally, long-term data confirmed that past summer droughts have led to similar metabolic alterations. Our results highlight the potential for drought to promote biogeochemical shifts that trigger poor water quality conditions in boreal streams. Given projected increases in hydrological extremes at northern latitudes, the consequences of drought for the health of running waters warrant attention.

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Section: Resultsmentioning

confidence: 99%

Drought alters the biogeochemistry of boreal stream networks

et al. 2020

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“…Depletion of dissolved oxygen may also be detrimental for gastropods using exclusive gill breathing such as Bithynia tentaculata (recorded in our study), and in a lesser extent for pulmonates potentially aerial breathing with differential sensitivity (Aldridge 1983; McMahon for reviews). For instance, P. acuta is among the most tolerant macroinvertebrates to hypoxic-anoxic conditions (Pardo and García 2016).…”

Section: Cyanobacteria Proliferationsmentioning

confidence: 99%

“…The expansion of its invaded range is partly attributed to efficient passive dispersal using animal vectors (waterbirds and large mammals) and off-road vehicles (Kappes and Haase 2012;Van Leeuwen et al 2013;Banha et al 2014). Successful invasion of P. acuta is also explained by high reproductive output and high tolerance to water quality decrease (e.g., sewage, pollutants such as heavy metals, cyanobacterial proliferations, hypoxia/anoxia) and changing environmental conditions (e.g., depth fluctuations, temperature increase) (Brackenbury and Appleton 1993;Blakely and Harding 2005;Gérard et al 2008;Albrecht et al 2009;Turner and Montgomery 2009;Zukowski and Walker 2009;Lance et al 2010;Pardo and García 2016).…”

Section: ) Larval Trematodes Acting As Biotic Stressors And/or Stresmentioning

confidence: 99%

“…Exposure to combined toxic blooms and droughts and their related stresses probably explain the disappearance of most macroinvertebrates, consequently which may be rather considered as stress bioindicators (vs gastropod biotic stressors). Indeed, drought commonly induces decrease of macroinvertebrate richness due to decrease of habitat diversity (Gérard 2000;Dewson et al 2007;Pardo and García 2016). Increases in cyanobacterial toxicity generally coincide with decreases in total abundance and richness in macroinvertebrate communities (White et al 2005).…”

Section: ) Macroinvertebrates Acting As Predators or Competitors Formentioning

confidence: 99%

“…Intensive blooms lead to the dying out of most benthic macroinvertebrates, except some taxa less sensitive to cyanotoxin exposure and becoming more abundant (Krzyzanek et al 1993;Oberholster et al 2009). Moreover, ammonia exposure and hypoxia/anoxia related to both toxic blooms and droughts may have adverse effects on macroinvertebrates (Richardson 1997;Pardo and García 2016).…”

Section: ) Macroinvertebrates Acting As Predators or Competitors Formentioning

confidence: 99%

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Decline of freshwater gastropods exposed to recurrent interacting stressors implying cyanobacterial proliferations and droughts

Gérard

Lance

2019

Aquat Ecol

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Freshwater biota increasingly undergo multiple stressors but we poorly understand to what extent they influence dynamics of community structure. Here, we study the impact of combined stressor exposure on gastropods at 9year interval, through a monthly one-year (2013) monitoring, also providing data on the occurrence of other macroinvertebrate taxa. Previous study in 2004 showed the occurrence of cyanobacteria proliferations, drought, trematode parasites and invasive non-native pulmonate Physa acuta. During 2013, we always detected cyanobacterial microcystins (MCs) in gastropods, from 59 to 4149 ng.g-1 fresh mass (vs 0-246 ng.g-1 in 2004), suggesting a continuous and increased MC-intoxication. Environmental intracellular MC concentrations were high (8-41 µg.L-1) from August to October 2013, whereas only detected in August 2004 (17 µg.L-1). In 2013, we recorded no trematodes among the 2490 sampled gastropods, and P. acuta represented 94% of gastropods (vs 58% in 2004). After August 2013, nearly all gastropods disappeared as most other macroinvertebrates (except Chironomidae, Ephemeroptera and Trichoptera). The whole decline of gastropods and other macroinvertebrates, and the absence of trematodes strongly suggest adverse conditions in the study-site. Despite acute stressful conditions suggested above, gastropod abundance was 13-fold higher in June 2013 (vs 2004), reflecting successful recolonization and efficient breeding. Most gastropods exposed to drought and toxic bloom were young vulnerable stages. Thus, we supposed alternation of local gastropod extinctions vs recolonization that could induce on a long term a loss of diversity to the detriment of the most sensitive species. Keywords Gastropoda; co-occurring multiple stressors; toxic blooms; water withdrawal; invasive species; trematodes. the year 2013 with data obtained during some months of 2004 (Gérard et al. 2009; Gérard, pers. com.). We aimed to check long-term changes at 9-year interval in the composition of gastropods, under the influence of exposure to the following interacting stressors: cyanobacteria proliferations, droughts, trematode parasites, and invasive non-native P. acuta. Material and methods Study-site The Frémur River (western France, 48°32' N, 2°04' W), representative of many small coastal catchments in Western Europe, is scattered with many dam obstructions that reduce the average velocity and increase the water depth. As a result, the total extent of the catchment is 5 ha of running water (streams) and 75 ha of still waters (ponds and reservoirs). The most important dam (14 m high) creates a 3 x 10 6 m 3 reservoir for drinking water.

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