Life-history responses of salinity-tolerant and salinity-sensitive lineages of a stenohaline cladoceran do not confirm clonal differentiation

Loureiro, Cláudia; Castro, Bruno B.; Cuco, Ana P.; Pedrosa, M. Arminda; Gonçalves, Fernando

doi:10.1007/s10750-012-1308-5

Cited by 18 publications

(17 citation statements)

References 28 publications

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“…This allowed an overall appraisal of the sources of variation in the physiological and biochemical patterns of the studied populations. Similar approaches have been described in the literature for other reproductive and physiological data matrices (Loureiro et al, 2012;Correia et al, 2014b).…”

Section: Discussionmentioning

confidence: 85%

Biochemical and physiological modifications in tissues of Sardina pilchardus: spatial and temporal patterns as a baseline for biomonitoring studies

Nunes

Travasso

Gonçalves

et al. 2015

Front. Environ. Sci.

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Sardina pilchardus is a marine species common in the North Atlantic Ocean, and is subjected to diffuse anthropogenic chemical contamination and seasonal fluctuations in biotic and abiotic parameters that may alter its physiology and condition. Biological material is easily available through commercial fisheries, which could facilitate its use as a bioindicator species. The aim of the present work was to address its potential inclusion in biomonitoring studies, considering a combinatory approach through the use of enzymatic biomarkers and somatic indices, by assessing spatial and temporal patterns in a metapopulation along the west coast of Portugal. Our results showed significant variability of the biochemical and physiological profile of the fish, mainly concordant between sampling sites. Large differences for most markers were found across periods of the year, showing the importance of seasonality, which was mostly related to the reproductive cycle. Hence, environmental scientists should acknowledge seasonality as a strong driving force for physiological adaptations, influencing biochemical markers that are normally used to identify effects of chemical contamination. The here-obtained set of data suggests that S. pilchardus may be successfully included in oceanic biomonitoring studies, when one considers that the contribution of seasonal factors may exceed the influence of eventual anthropogenic contamination.

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Section: Discussionmentioning

confidence: 85%

Biochemical and physiological modifications in tissues of Sardina pilchardus: spatial and temporal patterns as a baseline for biomonitoring studies

Nunes

Travasso

Gonçalves

et al. 2015

Front. Environ. Sci.

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“…However, this was not observed in terms of juvenile growth. Survival time is a very responsive endpoint, and we have shown that it can discriminate sensitivity to salinity much better than other endpoints (Loureiro et al, 2012), suggesting uncoupling of survival time and standard ecotoxicological parameters (Loureiro et al, 2013a). Surviving longer in the first hours of contact with a stressor (NaCl and osmotic pressure, in this case) is certainly among the first responses to stress, due to behavioural changes or physiological adjustment (Willmer et al, 2005), and may allow more time for animals to escape from the noxious environment.…”

Section: Discussionmentioning

confidence: 86%

“…It is expectable that, on the long term, adaptation to changing conditions will also translate into changes in the genetic composition of populations, because selection will act on extant genotypes (Boersma et al, 1999;Van Doorslaer et al, 2009;Jansen et al, 2011), although there is evidence that there is little space for adaptive shifts in stenohaline cladocerans (Loureiro et al, 2013a;Stoks et al, 2014). Additionally, our results are based on a single genotype, which poses limitations in terms of representativeness.…”

Section: Discussionmentioning

confidence: 94%

“…In this way, a single halotolerance measure was extracted for each growth assay, similarly to ST trials. This regression approach has the advantage of integrating the response along the NaCl gradient, and we have successfully used it for other life history parameters (Loureiro et al, 2013a). Therefore, this allows quantifying the proportional reduction in growth rate due to salinity across temperatures, rather than the absolute effect of salinity or temperature on the growth rate itself.…”

Section: Juvenile Growth Assays (Chronic Halotolerance)mentioning

confidence: 99%

“…The alternative hypothesis states that acclimation to culture conditions elicits an adaptive response of daphniids to saline stress or its interaction with temperature. Because previous data (Loureiro et al, 2012(Loureiro et al, , 2013a suggested that acute and chronic responses to NaCl were not coupled, we examined survival time and juvenile growth as measures of halotolerance.…”

Section: Introductionmentioning

confidence: 99%

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Progressive acclimation alters interaction between salinity and temperature in experimental Daphnia populations

et al. 2015

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Transgenerational Effects of Toxicants: An Extension of the Daphnia 21-day Chronic Assay?

Castro

Freches

Rodrigues

et al. 2018

Arch Environ Contam Toxicol

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The assessment of transgenerational effects should be incorporated in standard chronic toxicity protocols for the sake of a realistic extrapolation of contaminant effects to the population level. We propose a simple add-on to the standard 21-day chronic Daphnia magna assay, allowing the assessment of the reproductive performance of the offspring (F generation) born from the first clutch of the parental (F) generation. The extended generational assay was performed simultaneously with the standard reproduction assay. With this design, we evaluated the lethal, reproductive, and transgenerational effects of four widespread and extensively used substances: a biocide/anti-fouling (copper sulphate), an industrial oxidizing agent (potassium dichromate), a pharmaceutical (paracetamol), and a quaternary ammonium compound (benzalkonium chloride). Benzalkonium chloride was the most toxic in terms of lethality, whereas paracetamol, copper sulphate, and potassium dichromate caused deleterious effects in the reproductive performance of exposed D. magna. Adverse effects in the fitness of the daughter (F) generation were observed in the case of maternal exposure to paracetamol and copper sulphate, although they were not very pronounced. These findings highlight the usefulness of our approach and reinforce the view-shared by other authors-of the need for a generalised formal assessment of the transgenerational effects of pollutants.

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Life-history responses of salinity-tolerant and salinity-sensitive lineages of a stenohaline cladoceran do not confirm clonal differentiation

Cited by 18 publications

References 28 publications

Biochemical and physiological modifications in tissues of Sardina pilchardus: spatial and temporal patterns as a baseline for biomonitoring studies

Biochemical and physiological modifications in tissues of Sardina pilchardus: spatial and temporal patterns as a baseline for biomonitoring studies

Progressive acclimation alters interaction between salinity and temperature in experimental Daphnia populations

Transgenerational Effects of Toxicants: An Extension of the Daphnia 21-day Chronic Assay?

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