Effects of pH on salinity tolerance of selected freshwater invertebrates

Liliana Zalizniak, Ben Kefford, Dayanthi Nugegoda

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    Salinization of freshwaters often co-occurs with other changes in the environment, including pH. We investigate the effect of pH on salinity tolerance in selected macroinvertebrates (Notalina fulva, Centroptilum sp. and Physa acuta—lethal effects only) and microinvertebrates (Paramecium caudatum and Hydra oligactis—lethal and sublethal effects). Despite seemingly plausible physiological arguments, no difference in salinity tolerance over 96-h period was detected between low (5 or 6 nominal) pH and circumneutral (7– 8.2 nominal) pH. P. caudatum was more salt sensitive in pH 11 than in pH 5, 7, and 10 in terms of mortality, and in terms of a sublethal endpoint, number of individuals produced and survived over 72 h, more sensitive to salinity in pH 10 than in pH 5 and 7. No other effects of pH on salinity tolerance were detected. Acidification will likely have effects on freshwater organisms on its own, however, when combined with salinization (from saline waters approximating seawater) acidification level tested did not modify the direct effects of salinity on the sample of freshwater invertebrates tested from a range of taxonomic groups. Thus the risk of low (5 or 6) pH modifying the effect of salinity on freshwater invertebrates is not high. Logically, lower pH values might havemodified the effect of salinity, but there is a limited scope for lower pH values that would keep the species studied alive. In contrast, alkaline pH may increase the effect of salinity in some freshwater invertebrates. It is possible that the effect of pH on salinity tolerance may, however, be increased in saline waters with low calcium concentrations.
    Original languageEnglish
    Pages (from-to)135-144
    Number of pages10
    JournalAquatic Ecology
    Volume43
    DOIs
    Publication statusPublished - 2009

    Fingerprint

    salinity tolerance
    invertebrate
    invertebrates
    salinity
    salinization
    acidification
    Caudata
    effect
    saline water
    sublethal effect
    macroinvertebrate
    Physa
    Hydra
    Paramecium
    calcium
    sublethal effects
    salt
    seawater
    endpoints
    mortality

    Cite this

    Zalizniak, Liliana ; Kefford, Ben ; Nugegoda, Dayanthi. / Effects of pH on salinity tolerance of selected freshwater invertebrates. In: Aquatic Ecology. 2009 ; Vol. 43. pp. 135-144.
    @article{17c6f8b5aa81491297bc8990738003ba,
    title = "Effects of pH on salinity tolerance of selected freshwater invertebrates",
    abstract = "Salinization of freshwaters often co-occurs with other changes in the environment, including pH. We investigate the effect of pH on salinity tolerance in selected macroinvertebrates (Notalina fulva, Centroptilum sp. and Physa acuta—lethal effects only) and microinvertebrates (Paramecium caudatum and Hydra oligactis—lethal and sublethal effects). Despite seemingly plausible physiological arguments, no difference in salinity tolerance over 96-h period was detected between low (5 or 6 nominal) pH and circumneutral (7– 8.2 nominal) pH. P. caudatum was more salt sensitive in pH 11 than in pH 5, 7, and 10 in terms of mortality, and in terms of a sublethal endpoint, number of individuals produced and survived over 72 h, more sensitive to salinity in pH 10 than in pH 5 and 7. No other effects of pH on salinity tolerance were detected. Acidification will likely have effects on freshwater organisms on its own, however, when combined with salinization (from saline waters approximating seawater) acidification level tested did not modify the direct effects of salinity on the sample of freshwater invertebrates tested from a range of taxonomic groups. Thus the risk of low (5 or 6) pH modifying the effect of salinity on freshwater invertebrates is not high. Logically, lower pH values might havemodified the effect of salinity, but there is a limited scope for lower pH values that would keep the species studied alive. In contrast, alkaline pH may increase the effect of salinity in some freshwater invertebrates. It is possible that the effect of pH on salinity tolerance may, however, be increased in saline waters with low calcium concentrations.",
    keywords = "Combined effects, Toxicity modifiers, Ionic proportions, Ecotoxicity.",
    author = "Liliana Zalizniak and Ben Kefford and Dayanthi Nugegoda",
    year = "2009",
    doi = "10.1007/s10452-007-9148-5",
    language = "English",
    volume = "43",
    pages = "135--144",
    journal = "HYDROBIOL. BULL.",
    issn = "1380-8427",
    publisher = "Springer",

    }

    Effects of pH on salinity tolerance of selected freshwater invertebrates. / Zalizniak, Liliana; Kefford, Ben; Nugegoda, Dayanthi.

    In: Aquatic Ecology, Vol. 43, 2009, p. 135-144.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Effects of pH on salinity tolerance of selected freshwater invertebrates

    AU - Zalizniak, Liliana

    AU - Kefford, Ben

    AU - Nugegoda, Dayanthi

    PY - 2009

    Y1 - 2009

    N2 - Salinization of freshwaters often co-occurs with other changes in the environment, including pH. We investigate the effect of pH on salinity tolerance in selected macroinvertebrates (Notalina fulva, Centroptilum sp. and Physa acuta—lethal effects only) and microinvertebrates (Paramecium caudatum and Hydra oligactis—lethal and sublethal effects). Despite seemingly plausible physiological arguments, no difference in salinity tolerance over 96-h period was detected between low (5 or 6 nominal) pH and circumneutral (7– 8.2 nominal) pH. P. caudatum was more salt sensitive in pH 11 than in pH 5, 7, and 10 in terms of mortality, and in terms of a sublethal endpoint, number of individuals produced and survived over 72 h, more sensitive to salinity in pH 10 than in pH 5 and 7. No other effects of pH on salinity tolerance were detected. Acidification will likely have effects on freshwater organisms on its own, however, when combined with salinization (from saline waters approximating seawater) acidification level tested did not modify the direct effects of salinity on the sample of freshwater invertebrates tested from a range of taxonomic groups. Thus the risk of low (5 or 6) pH modifying the effect of salinity on freshwater invertebrates is not high. Logically, lower pH values might havemodified the effect of salinity, but there is a limited scope for lower pH values that would keep the species studied alive. In contrast, alkaline pH may increase the effect of salinity in some freshwater invertebrates. It is possible that the effect of pH on salinity tolerance may, however, be increased in saline waters with low calcium concentrations.

    AB - Salinization of freshwaters often co-occurs with other changes in the environment, including pH. We investigate the effect of pH on salinity tolerance in selected macroinvertebrates (Notalina fulva, Centroptilum sp. and Physa acuta—lethal effects only) and microinvertebrates (Paramecium caudatum and Hydra oligactis—lethal and sublethal effects). Despite seemingly plausible physiological arguments, no difference in salinity tolerance over 96-h period was detected between low (5 or 6 nominal) pH and circumneutral (7– 8.2 nominal) pH. P. caudatum was more salt sensitive in pH 11 than in pH 5, 7, and 10 in terms of mortality, and in terms of a sublethal endpoint, number of individuals produced and survived over 72 h, more sensitive to salinity in pH 10 than in pH 5 and 7. No other effects of pH on salinity tolerance were detected. Acidification will likely have effects on freshwater organisms on its own, however, when combined with salinization (from saline waters approximating seawater) acidification level tested did not modify the direct effects of salinity on the sample of freshwater invertebrates tested from a range of taxonomic groups. Thus the risk of low (5 or 6) pH modifying the effect of salinity on freshwater invertebrates is not high. Logically, lower pH values might havemodified the effect of salinity, but there is a limited scope for lower pH values that would keep the species studied alive. In contrast, alkaline pH may increase the effect of salinity in some freshwater invertebrates. It is possible that the effect of pH on salinity tolerance may, however, be increased in saline waters with low calcium concentrations.

    KW - Combined effects

    KW - Toxicity modifiers

    KW - Ionic proportions

    KW - Ecotoxicity.

    U2 - 10.1007/s10452-007-9148-5

    DO - 10.1007/s10452-007-9148-5

    M3 - Article

    VL - 43

    SP - 135

    EP - 144

    JO - HYDROBIOL. BULL.

    JF - HYDROBIOL. BULL.

    SN - 1380-8427

    ER -