Temperature influences species interactions between a native and a globally invasive freshwater snail

Paula Sardina, Jason Beringer, Dylan Roche, Ross THOMPSON

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    Abstract

    We experimentally assessed the interaction between a globally invasive snail (Potamopyrgus antipodarum) and an Australian native snail (Austropyrgus angasi) under temperatures based on current (1990-2000, mean = 17.94-19.02°C) and future (2100, mean = 19.42-21.65°C) predicted conditions. Temperature treatments were scenarios identified from down-scaled global circulation models. Growth rates (mm/d) for juveniles and adults were measured at low (1000 individuals [ind]/m2) and high (20,000 ind/m2) densities in intraspecific and interspecific interaction trials under the 2 temperature regimes. Juveniles of both species grew at similar rates regardless of temperature and density. On the other hand, adults had dissimilar growth rates among treatments. Under current temperatures, P. antipodarum adults grew significantly faster than A. angasi adults when both species were kept at high densities in the interspecific treatment (interspecific-high) and faster than when they were kept at high densities but with conspecifics in the intraspecific treatment (intraspecific-high). However, we did not detect intra- or interspecific competition effects on either species. Thus, our results suggest that under current conditions, P. antipodarum gained from foraging with A. angasi (unidirectional facilitation effect). Under 2100 temperatures, the facilitative effect of A. angasi on P. antipodarum growth was not apparent, a result suggesting that the facilitation was directly related to the temperature conditions. Our research shows the importance of considering future temperature conditions as a factor that could alter species interactions and potentially influence the ecological effects of invasive species.
    Original languageEnglish
    Pages (from-to)933-941
    Number of pages9
    JournalFreshwater Science
    Volume34
    Issue number3
    DOIs
    Publication statusPublished - 2015

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    snail
    snails
    Potamopyrgus antipodarum
    temperature
    facilitation
    intraspecific interaction
    interspecific interaction
    intraspecific competition
    interspecific competition
    invasive species
    foraging
    effect

    Cite this

    Sardina, Paula ; Beringer, Jason ; Roche, Dylan ; THOMPSON, Ross. / Temperature influences species interactions between a native and a globally invasive freshwater snail. In: Freshwater Science. 2015 ; Vol. 34, No. 3. pp. 933-941.
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    abstract = "We experimentally assessed the interaction between a globally invasive snail (Potamopyrgus antipodarum) and an Australian native snail (Austropyrgus angasi) under temperatures based on current (1990-2000, mean = 17.94-19.02°C) and future (2100, mean = 19.42-21.65°C) predicted conditions. Temperature treatments were scenarios identified from down-scaled global circulation models. Growth rates (mm/d) for juveniles and adults were measured at low (1000 individuals [ind]/m2) and high (20,000 ind/m2) densities in intraspecific and interspecific interaction trials under the 2 temperature regimes. Juveniles of both species grew at similar rates regardless of temperature and density. On the other hand, adults had dissimilar growth rates among treatments. Under current temperatures, P. antipodarum adults grew significantly faster than A. angasi adults when both species were kept at high densities in the interspecific treatment (interspecific-high) and faster than when they were kept at high densities but with conspecifics in the intraspecific treatment (intraspecific-high). However, we did not detect intra- or interspecific competition effects on either species. Thus, our results suggest that under current conditions, P. antipodarum gained from foraging with A. angasi (unidirectional facilitation effect). Under 2100 temperatures, the facilitative effect of A. angasi on P. antipodarum growth was not apparent, a result suggesting that the facilitation was directly related to the temperature conditions. Our research shows the importance of considering future temperature conditions as a factor that could alter species interactions and potentially influence the ecological effects of invasive species.",
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    Temperature influences species interactions between a native and a globally invasive freshwater snail. / Sardina, Paula; Beringer, Jason; Roche, Dylan; THOMPSON, Ross.

    In: Freshwater Science, Vol. 34, No. 3, 2015, p. 933-941.

    Research output: Contribution to journalArticle

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