Effects of salinity tolerances on survival and life history of 2 cladocerans

Gökçe, Didem; Turhan, Duygu Özhan

doi:10.3906/zoo-1304-21

Cited by 11 publications

(4 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…References: a Copan (2016); b Valenti et al . (2006); c Gillis (2011); d Patrick, Scheier & Cairns Jr (1968); e Gökçe & Turhan (2014); f Harmon, Specht & Chandler (2003); g Struewing et al . (2014); h Fritts et al .…”

Section: Resultsmentioning

confidence: 99%

“…From the lethal or sublethal endpoint values reported for exposure to NaCl (as a surrogate for natural SW), cladocerans and freshwater cnidarians are likely to be severely affected by increasing salinization (e.g. Santos, Vicensotti & Monteiro, 2007; Gökçe & Turhan, 2014; Venâncio et al ., 2019 a ). For instance, Santos, Vicensotti & Monteiro (2007) verified that the lethal concentration causing 50% mortality at 96 h (LC 50,96h ) for NaCl on Hydra attenuata was 0.246 mS/cm [salinities are expressed herein in units of conductivity], but that organisms started to show abnormalities that may interfere with normal feeding behaviour at a salinity almost half of this (effective concentration EC 50,96h = 0.147 mS/cm).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Seawater intrusion: an appraisal of taxa at most risk and safe salinity levels

2021

View full text Add to dashboard Cite

Seawater intrusion into low‐lying coastal ecosystems carries environmental risks. Salinity levels at these coastal ecosystems may vary substantially, causing ecological effects from mortality to several sublethal endpoints, such as depression of rates of feeding, somatic growth, or reproduction. This review attempts to establish safe salinity levels for both terrestrial and freshwater temperate ecosystems by integrating data available in the literature. We have four specific objectives: (i) to identify the most sensitive ecological taxa to seawater intrusion; (ii) to establish maximum acceptable concentrations–environmental quality standards (MAC‐EQSs) for sea water (SW) from species sensitivity distributions (SSDs); (iii) to compile from the literature examples of saline intrusion [to be used as predicted environmental concentrations (PECs)] and to compute risk quotients for the temperate zone; and (iv) to assess whether sodium chloride (NaCl) is an appropriate surrogate for SW in ecological risk assessments by comparing SSD‐derived values for NaCl and SW and by comparing these with field data. Zooplankton, early life stages of amphibians and freshwater mussels were the most sensitive ecological receptors for the freshwater compartment, while soil invertebrates were the most sensitive ecological receptors for the terrestrial compartment. Hazard concentration 5% (HC5) values, defined as the concentration (herein measured as conductivity) that affects (causes lethal or sublethal effects) 5% of the species in a distribution, computed for SW were over 22 and 40 times lower than the conductivity of natural SW (≈ 52 mS/cm) for the freshwater and soil compartment, respectively. This sensitivity of both compartments means that small increments in salinity levels or small SW intrusions might represent severe risks for low‐lying coastal ecosystems. Furthermore, the proximity between HC5 values for the soil and freshwater compartments suggests that salinized soils might represent an additional risk for nearby freshwater systems. This sensitivity was corroborated by the derivation of risk quotients using real saline intrusion examples (PECs) collected from the literature: risk was >1 in 34 out of 37 examples. By contrast, comparisons of HC5 values obtained from SSDs in field surveys or mesocosm studies suggest that natural communities are more resilient to salinization than expected. Finally, NaCl was found to be slightly more toxic than SW, at both lethal and sublethal levels, and, thus, is suggested to be an acceptable surrogate for use in risk assessment.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seawater intrusion: an appraisal of taxa at most risk and safe salinity levels

2021

View full text Add to dashboard Cite

show abstract

“…The freshwater zooplankton D. magna has been commonly used in acute and chronic ecotoxicology studies to evaluate the toxic effects of chemicals in aquatic environments, due to high sensitivity, easy culture in the laboratory, and relatively short lifetime (Fikirdeşici et al, 2012;Gökçe and Özhan Turhan, 2014;Liu et al, 2017). D. magna is the primary consumer of algae and bacteria and primary forage for fish (Seyoum and Pradhan, 2019).…”

Section: Introductionmentioning

confidence: 99%

Acute and chronic effects of thifluzamide on Daphniamagna

Aksakal¹

2019

Turk J Zool

View full text Add to dashboard Cite

Thifluzamide is a thiazole carboxanilide fungicide used to control a wide range of basidiomycete diseases on maize, potatoes, rice, and other crops. Although this fungicide is found in aquatic environments, there is no information about its acute and chronic toxicity on aquatic invertebrates. In the present study, to investigate acute and chronic toxicity of thifluzamide, daphnids were exposed to 1.25, 1.5, 2, and 2.5 mg/L thifluzamide for 48 h and 21 days, respectively. The expression of four oxidative stress-related genes (CAT, GCLC, GST, and GPX) and life-history parameters such as days to the first brood, days to the first egg production, and molting frequency were measured. The results showed that exposure to thifluzamide for 48 h significantly induced the expression of oxidative stress-related genes in D. magna. A dose-dependent relationship was obtained for mRNA levels of CAT and GST. In the 21-day chronic toxicity test, a concentration-dependent decrease was observed for the number of neonates per Daphnia, the number of broods per female, and molting frequency. Additionally, the first brood day and the first egg production day were significantly (P < 0.05) delayed in a dose-dependent manner. The results of this study indicate that the harmful effects of thifluzamide on aquatic invertebrates cannot be ignored and further investigation is needed.

show abstract

“…For freshwater organisms that inhabit coastal habitats, fluctuating and rising salinity levels present a major challenge because of increased stress, leading to reduced reproduction and impaired development ( Albecker & McCoy, 2017 ). Although cladocerans in general, and D. magna in particular, may show tolerance to salinity stress ( Schuytema, Nebeker & Stutzman, 1997 ; Gökçe & Turhan, 2014 ), increased salinisation not only changes the conditions necessary to maintain normal osmotic pressure and life functions, but can also alter reproductive rates, survivorship rates and population dynamics ( Weider & Hebert, 1987 ; Lignot, Spanings-Pierrot & Charmantier, 2000 ; Ghazy et al, 2009 ). Further, elevated levels of stress may lead to extinction of the stressed brackish and freshwater zooplankton from the affected ecosystem as proposed by Gökçe & Turhan (2014) for two species of cladocerans ( Scapholeberis mucronata and Simocephalus vetulus ).…”

Section: Introductionmentioning

confidence: 99%

Novel resilience in response to revitalisation after exposure to lethal salinity causes differential reproductive success in an extremely plastic organism

Khudr¹,

Purkiss²,

Kalkuhl³

et al. 2018

PeerJ

View full text Add to dashboard Cite

Phenotypic plasticity is central to an organism’s ability to adapt to variable environmental conditions. For aquatic organisms, exposure to elevated salt levels poses a challenge and organisms may fail to tolerate or survive much higher levels short-term. Here we demonstrate, for the first time, in a laboratory study of Daphnia magna that exposure to levels of salinity higher than those previously shown to lead to apparent death (paralysis) can be reversed following a transfer to optimal conditions. We established experimental populations from one clone of D. magna, each with five replicates, that were exposed to different short periods of three different lethal levels of salinity (12.27 PSU [45, 60, 90 and 120 min], 18.24 PSU [45, 60 and 90 min] and 24.22 PSU [45, 60 and 90 min]). In all populations, all individuals were paralysed at the end of their exposure, usually classified in the literature as dead. Subsequently, all individuals were transferred to optimal conditions. However, after the transfer, a proportion of the individuals not only came back from the verge of death (i.e. were revitalised), but also showed afterwards differential reproductive success over a period of 20 days, depending on the level and the length of exposure before revitalisation. Both exposure level and time had an overall negative effect on population size that differed across all treatments. Revitalisation occurred within an hour after the transfer to optimal conditions for 18.24 PSU but took 14–16 h for 12.27 PSU. There was no instantaneous revitalisation nor was there any revitalisation after 16 h no matter how long the paralysed Daphnia individuals were left in the optimal conditions. Our findings cast new light on resilience in cladocerans and suggest that abrupt environmental change can reveal novel plastic responses to extreme conditions.

show abstract

Effects of salinity tolerances on survival and life history of 2 cladocerans

Cited by 11 publications

References 19 publications

Seawater intrusion: an appraisal of taxa at most risk and safe salinity levels

Seawater intrusion: an appraisal of taxa at most risk and safe salinity levels

Acute and chronic effects of thifluzamide on Daphniamagna

Novel resilience in response to revitalisation after exposure to lethal salinity causes differential reproductive success in an extremely plastic organism

Contact Info

Product

Resources

About