Prolonged exposure to low oxygen improves hypoxia tolerance in a freshwater fish

Gilmore, Kayla L.; Doubleday, Zoë A.; Gillanders, Bronwyn M.

doi:10.1093/conphys/coz058

Cited by 19 publications

(14 citation statements)

References 42 publications

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“…The loss of equilibrium is a consequence of metabolic disturbances and prevents fish from escaping unfavourable conditions (Beitinger et al ., 2000). This criterion has been applied in many studies dedicated to hypoxia and thermal tolerance of fishes ( e.g ., Delage et al ., 2014; Gilmore et al ., 2019; Healy & Schulte, 2012), including 3‐month‐old allis shad (Jatteau & Fraty, 2012). Therefore, heavy stress, as defined here, appears to be a good proxy of the survival probability of young allis shad.…”

Section: Discussionmentioning

confidence: 99%

Tolerance of young allis shad Alosa alosa (Clupeidae) to oxy‐thermic stress

Baumann

Vega

Philip

et al. 2020

Journal of Fish Biology

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The ecology of the young stages of allis shad Alosa alosa is poorly documented, although they can be exposed to many pressures during their freshwater phase and their downstream migration. When passing through systems such as the Gironde‐Garonne‐Dordogne watershed (GGD, SW France), they can be subjected to high temperatures and low levels of oxygen (hypoxia). The aim of this work is to assess the tolerance of young Alosa alosa at four ages (c. 10, 30, 60 and 85 days old) by challenging them to different temperatures (18, 22, 26 and 28°C) together with decreasing oxygen saturation levels (from 100% to 30%). Survival of the 10‐day‐old individuals was not influenced by oxy‐thermic conditions, but high stress levels were detected and perhaps this age class was too fragile regarding the constraint of the experimental design. Survival at 30 and at 60 days old was negatively influenced by the highest temperatures tested alone (from 26°C and from 28°C, respectively) but no effect was detected at 85 days old up to 28°C. A combined effect of temperature and oxygen level was highlighted, with heat accelerating survival decrease when associated with oxygen level depletion: essentially, survival was critical (<50%) at 30 days old at temperature ≥22°C together with 30% O2; at 60 days old, at temperature = 28°C with 30% O2; at 85 days old, at temperature ≥26°C with ≤40% O2. Tolerance to oxy‐thermic pressures appeared to be greater among the migratory ages (60 and 85 days old) than among the 30‐day‐old group. Based on environmental data recorded in the GGD system and on our experimental results, an exploratory analysis allowed a discussion of the possible impact of past oxy‐thermic conditions on the local population dynamics between 2005 and 2018. The oxy‐thermic conditions that may affect Alosa alosa at ages when they migrate downstream (60 and 85 days old) were not frequently recorded in this period, except in cases of extreme episodes of heat together with hypoxia that occurred in some years, in summertime in the turbidity maximum zone of the Gironde estuary (particularly in the year 2006). Interestingly, oxy‐thermic conditions that are likely to threaten the 30‐day‐old individuals occurred more frequently in the lower freshwater parts of the GGD system between the years 2005 and 2018. In the context of climate change, a general increase in temperature is predicted, as well as more frequent and severe hypoxic events, therefore we suggest that local Alosa alosa population recruitment could encounter critical oxy‐thermic conditions more frequently in the future if no adaptive management of water resources occurs.

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Section: Discussionmentioning

confidence: 99%

Tolerance of young allis shad Alosa alosa (Clupeidae) to oxy‐thermic stress

Baumann

Vega

Philip

et al. 2020

Journal of Fish Biology

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“…An excessive supply of nutrients to a water body causes abnormal growth of microorganisms and aquatic plants that reduce the penetration of radiation and consume dissolved oxygen (hypoxia). Aquatic species show diverse tolerance to moderate hypoxic conditions (less than 4 mgO 2 dissL -1 ) (Gilmore, Doubleday, & Gillanders, 2019;Johnson, Powers, Senne, & Park, 2009). In Latin America, the rate of nitrogen species entry into ecosystems is greater than in developed countries and threatens biodiversity hotspots on the continent (Austin et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Nitrates Evaluation in the National Térraba-Sierpe Wetland

Hernández-Alpízar

Mora-Molina

2022

Uniciencia

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This research aimed to describe, spatially and temporally, the concentrations of nitrates in correlation with anthropogenic activities surrounding the Sierpe River that crosses the National Térraba-Sierpe Wetland (HNTS). Although territorially protected by Costa Rican legislation, this wetland is surrounded by intense agricultural activity. In 2018, monthly monitoring of pH, nitrates, and dissolved oxygen was carried out in fourteen points of the river. A baseline around 5 mg NO3- / L was obtained in periods without agricultural activities and peaks up to 20 mg NO3- / L after fertilization activities. Correspondingly, a decrease in dissolved oxygen and pH was observed on days of high agricultural activity. In the months following fertilization, accelerated growth of aquatic plants and a general deterioration in mangrove reproduction were observed by collaborators of the HNTS management and surveillance program. Nevertheless, when high nitrates concentration in agricultural areas are observed, their decline is also observed in the direction of the river's flow until it reaches its mouth. This facts shows the still active function of the wetland and its importance in the processing of nitrates. To regulate activities not only in the territorial limit but also in the limits of the water system surrounding the HNTS is recommended to protect this ecosystem function.

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“…As a health indicator for water bodies, the dissolved oxygen (DO) concentration plays important roles in maintaining microbial diversity and various ecosystem and biogeochemical processes in lake ecosystems [1][2][3]. Sufficient levels of DO in water are essential for the survival of various aquatic organisms, such as algae, zooplankton, and aquatic plants.…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Estimating Dissolved Oxygen Based on a High-Accuracy Surface Modeling Method

Zhao

Fan

Zhao

2021

Sensors

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Dissolved oxygen (DO) is a direct indicator of water pollution and an important water quality parameter that affects aquatic life. Based on the fundamental theorem of surfaces in differential geometry, the present study proposes a new modeling approach to estimate DO concentrations with high accuracy by assessing the spatial correlation and heterogeneity of DO with respect to explanatory variables. Specifically, a regularization penalty term is integrated into the high-accuracy surface modeling (HASM) method by applying geographically weighted regression (GWR) with some covariates. A modified version of HASM, namely HASM_MOD, is illustrated through a case study of Poyang Lake, China, by comparing the results of HASM, a support vector machine (SVM), and cokriging. The results indicate that HASM_MOD yields the best performance, with a mean absolute error (MAE) that is 38%, 45%, and 42% lower than those of HASM, the SVM, and cokriging, respectively, by using the cross-validation method. The introduction of a regularization penalty term by using GWR with respect to covariates can effectively improve the quality of the DO estimates. The results also suggest that HASM_MOD is able to effectively estimate nonlinear and nonstationary time series and outperforms three other methods using cross-validation, with a root-mean-square error (RMSE) of 0.20 mg/L and R2 of 0.93 for the two study sites (Sanshan and Outlet_A stations). The proposed method, HASM_MOD, provides a new way to estimate the DO concentration with high accuracy.

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Prolonged exposure to low oxygen improves hypoxia tolerance in a freshwater fish

Cited by 19 publications

References 42 publications

Tolerance of young allis shad Alosa alosa (Clupeidae) to oxy‐thermic stress

Tolerance of young allis shad Alosa alosa (Clupeidae) to oxy‐thermic stress

Nitrates Evaluation in the National Térraba-Sierpe Wetland

A New Approach for Estimating Dissolved Oxygen Based on a High-Accuracy Surface Modeling Method

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