Chronic toxicity of sulfate to juvenile Baltic isopods, Idotea balthica

Sulfate pollution in the aquatic environment is a growing concern, particularly in brackish water ecosystems such as the Baltic Sea. Human activities have significantly increased sulfate inputs, posing potential risks to aquatic organisms. Elevated sulfate concentrations can negatively affect aqua...

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Main Author: Samarawickrama, Rashmika
Other Authors: Matemaattis-luonnontieteellinen tiedekunta, Faculty of Sciences, Bio- ja ympäristötieteiden laitos, Department of Biological and Environmental Science, Jyväskylän yliopisto, University of Jyväskylä
Format: Master's thesis
Language:eng
Published: 2025
Subjects:
Online Access: https://jyx.jyu.fi/handle/123456789/103674
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author Samarawickrama, Rashmika
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä
author_facet Samarawickrama, Rashmika Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä Samarawickrama, Rashmika Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä
author_sort Samarawickrama, Rashmika
datasource_str_mv jyx
description Sulfate pollution in the aquatic environment is a growing concern, particularly in brackish water ecosystems such as the Baltic Sea. Human activities have significantly increased sulfate inputs, posing potential risks to aquatic organisms. Elevated sulfate concentrations can negatively affect aquatic organisms by causing osmolarity-related toxicity. This study examined the chronic toxicity of sulfate ( SO4 2−) on juvenile Baltic isopods (Idotea balthica), a widely distributed species in the Baltic Sea coastal ecosystem. The main aim of this ecotoxicological study was to assess the impact of sulfate on survival and growth of juvenile Baltic isopods and determine the lethal concentration (LCx) and effective concentration (ECx) of sulfate. A 16-day chronic toxicity test was conducted in a controlled laboratory condition, exposing juvenile I. balthica to a range of sulfate concentrations. Survival was used to calculate LC10, LC20 and LC50 values, which were determined to be 2 884 mg/l, 3 355 mg/l and 4 216 mg/l respectively. The results showed that elevated levels of sulfate negatively affected the survival of juvenile I. balthica. Growth analysis indicated that there was no statistically significant difference in growth at lower sulfate concentrations. Furthermore, the findings suggested that I. balthica exhibited relatively high tolerance to sulfate compared to freshwater species, likely due to its osmoregulatory adaptations, including active ion transport across its pleopods. However, long-term sulfate pollution may contribute to salinity fluctuations and impact growth of I. balthica and other brackish water species with lower tolerance levels.
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Human activities have significantly increased sulfate inputs, posing potential risks to aquatic organisms. Elevated sulfate concentrations can negatively affect aquatic organisms by causing osmolarity-related toxicity. This study examined the chronic toxicity of sulfate ( SO4 2\u2212) on juvenile Baltic isopods (Idotea balthica), a widely distributed species in the Baltic Sea coastal ecosystem. The main aim of this ecotoxicological study was to assess the impact of sulfate on survival and growth of juvenile Baltic isopods and determine the lethal concentration (LCx) and effective concentration (ECx) of sulfate. A 16-day chronic toxicity test was conducted in a controlled laboratory condition, exposing juvenile I. balthica to a range of sulfate concentrations. Survival was used to calculate LC10, LC20 and LC50 values, which were determined to be 2 884 mg/l, 3 355 mg/l and 4 216 mg/l respectively. The results showed that elevated levels of sulfate negatively affected the survival of juvenile I. balthica. Growth analysis indicated that there was no statistically significant difference in growth at lower sulfate concentrations. Furthermore, the findings suggested that I. balthica exhibited relatively high tolerance to sulfate compared to freshwater species, likely due to its osmoregulatory adaptations, including active ion transport across its pleopods. 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spellingShingle Samarawickrama, Rashmika Chronic toxicity of sulfate to juvenile Baltic isopods, Idotea balthica Akvaattiset tieteet Aquatic sciences sulfaatit myrkyllisyys ekotoksikologia vesieläimistö leväsiira
title Chronic toxicity of sulfate to juvenile Baltic isopods, Idotea balthica
title_full Chronic toxicity of sulfate to juvenile Baltic isopods, Idotea balthica
title_fullStr Chronic toxicity of sulfate to juvenile Baltic isopods, Idotea balthica Chronic toxicity of sulfate to juvenile Baltic isopods, Idotea balthica
title_full_unstemmed Chronic toxicity of sulfate to juvenile Baltic isopods, Idotea balthica Chronic toxicity of sulfate to juvenile Baltic isopods, Idotea balthica
title_short Chronic toxicity of sulfate to juvenile Baltic isopods, Idotea balthica
title_sort chronic toxicity of sulfate to juvenile baltic isopods idotea balthica
title_txtP Chronic toxicity of sulfate to juvenile Baltic isopods, Idotea balthica
topic Akvaattiset tieteet Aquatic sciences sulfaatit myrkyllisyys ekotoksikologia vesieläimistö leväsiira
topic_facet Akvaattiset tieteet Aquatic sciences ekotoksikologia leväsiira myrkyllisyys sulfaatit vesieläimistö
url https://jyx.jyu.fi/handle/123456789/103674 http://www.urn.fi/URN:NBN:fi:jyu-202506175475
work_keys_str_mv AT samarawickramarashmika chronictoxicityofsulfatetojuvenilebalticisopodsidoteabalthica