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

Autor: Maria Teresa Claro, Joana I. Santos, Cláudia Loureiro, M. Arminda Pedrosa, Fernando Gonçalves, Bruno B. Castro, Ana P. Cuco
Přispěvatelé: Universidade do Minho
Rok vydání: 2014
Předmět:
0106 biological sciences
Salinity
Environmental Engineering
Environmental change
Health
Toxicology and Mutagenesis
Acclimatization
Ciências Biológicas [Ciências Naturais]
Temperature salinity diagrams
010501 environmental sciences
Sodium Chloride
01 natural sciences
Daphnia
Stress
Physiological
Environmental Chemistry
Animals
14. Life underwater
Chronic toxicity
0105 earth and related environmental sciences
Ciências Naturais::Ciências Biológicas
Science & Technology
Daphnia galeata
biology
Ecology
010604 marine biology & hydrobiology
Public Health
Environmental and Occupational Health
Temperature
Multiple environmental stressors
General Medicine
General Chemistry
biology.organism_classification
Pollution
Halotolerance
Temperature-dependent toxicity
Acclimation
Salinity effects
Environmental Monitoring
Zdroj: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
ISSN: 1879-1298
Popis: Environmental stressors rarely act in isolation, giving rise to interacting environmental change scenarios. However, the impacts of such interactions on natural populations must consider the ability of organisms to adapt to environmental changes. The phenotypic adaptability of a Daphnia galeata clone to temperature rise and salinisation was investigated in this study, by evaluating its halotolerance at two different temperatures, along a short multigenerational acclimation scenario. Daphniids were acclimated to different temperatures (20 degrees C and 25 degrees C) and salinities (0 g L-1 and 1 g L-1, using NaCl as a proxy) in a fully crossed design. The objective was to understand whether acclimation to environmental stress (combinations of temperature and salinity) influenced the response to the latter exposure to these stressors. We hypothesize that acclimation to different temperature x salinity regimes should elicit an acclimation response of daphniids to saline stress or its interaction with temperature. Acute (survival time) and chronic (juvenile growth) halotolerance measures were obtained at discrete timings along the acclimation period (generations F1, F3 and F9). Overall, exposure temperature was the main determinant of the acute and chronic toxicity of NaCI: daphniid sensitivity (measured as the decrease of survival time or juvenile growth) was consistently higher at the highest temperature, irrespective of background conditions. However, this temperature-dependent effect was nullified after nine generations, but only when animals had been acclimated to both stressors (high salinity and high temperature). Such complex interaction scenarios should be taken in consideration in risk assessment practices.
This work was supported by European Funds through COMPETE and by National Funds through the Portuguese Science Foundation (FCT) within project PEst-C/MAR/LA0017/2013 and UID/AMB/50017/2013. Claudia Loureiro and Ana P. Cuco were, at the time of the study, recipients of PhD grants from FCT (refs. SFRH/BD/36333/2007 and SFRH/BD/81661/2011), while Bruno B. Castro was hired under the programme Ciencia2008 (FCT, Portugal), co-funded by the Human Potential Operational Programme (National Strategic Reference Framework 2007-2013) and European Social Fund (EU). This work was also partly funded via internal funding granted by the Centre for Environmental and Marine Studies (CESAM) to Bruno B. Castro (kick-off projects for young researchers). This work is also part of the project Saltfree (PTDC/AAC-AMB/104532/2008), which is funded by FEDER through COMPETE and by national funding from FCT.
info:eu-repo/semantics/publishedVersion
Databáze: OpenAIRE
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