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  • Temperature and salinity effects on growth, survival, reproduction, and potential distribution of two non-indigenous botryllid ascidians in British Columbia.

    Author(s) : Epelbaum, A.Herborg, L. M.Therriault, T. W.Pearce, C. M.

    Author Affiliation : Fisheries and Oceans Canada, Pacific Biological Station, 3190 Hammond Bay Road, Nanaimo, British Columbia V9T 6N7, Canada.

    Author Email : Anna.Epelbaum@dfo-mpo.gc.ca

    Journal article : Journal of Experimental Marine Biology and Ecology 2009 Vol.369 No.1 pp.43-52

    Abstract : Two non-indigenous botryllid ascidian species - Botryllus schlosseribotryllus schlosseriSubject Category: Organism Names
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    (golden star tunicate) and Botrylloides violaceusbotrylloides violaceusSubject Category: Organism Names
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    (violet tunicate) - have become established in British Columbiabritish columbiaSubject Category: Geographic Entities
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    (BC), CanadacanadaSubject Category: Geographic Entities
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    . One species, B. schlosseri, is native to Europe while the other, B. violaceus, is native to Asia. Environmental tolerances of both species are poorly understood. We examined the effects of temperaturetemperatureSubject Category: Properties
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    and salinitysalinitySubject Category: Properties
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    on growthgrowthSubject Category: Natural Processes
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    , survivalsurvivalSubject Category: Miscellaneous
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    , and reproductionreproductionSubject Category: Miscellaneous
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    of these species in the laboratory in order to characterize their environmental tolerances and preferences. Laboratory-raised juvenile colonies were studied using a two-factorial experimental design with five levels of temperature (5, 10, 15, 20, 25°C) and five levels of salinity (14, 20, 26, 32, 38 per mil). Both B. schlosseri and B. violaceus possessed broad temperature and salinity tolerances, but B. schlosseri was slightly more euryhalinal than B. violaceus. Generally, B. schlosseri survived environmental conditions of 10-25°C and 14-38 per mil, exhibited positive growth at 10-25°C and 20-38 per mil, and attained its largest colony sizes at 15-20°C and 20-38 per mil. Botrylloides violaceus tolerated environmental conditions between 5-25°C and 20-38 per mil, demonstrated positive growth at 15-25°C and 26-38 per mil, and attained its largest colony sizes at 20-25°C and 26-38 per mil. Results from the laboratory experiment were then used in a modeling exercise to determine the coastal areas of BC that these organisms might be likely to exist in or invade, based on near-surface temperatures and salinities. The model predicted that no areas were totally unsuitable for survival and growth of either species (based solely on temperature and salinity tolerances), with the most suitable locations being along the west coast of Vancouver Island, a region with significant shellfishshellfishSubject Category: Organism Groups
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    aquaculture activity.

    ISSN : 0022-0981

    DOI : 10.1016/j.jembe.2008.10.028

    Record Number : 20093325785

    Publisher : Elsevier

    Location of publication : Amsterdam

    Country of publication : Netherlands

    Language of text : English

    Indexing terms for this abstract:

    Organism descriptor(s) : AscidiaceaascidiaceaSubject Category: Organism Names
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    , BotryllidaebotryllidaeSubject Category: Organism Names
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    , BotrylloidesbotrylloidesSubject Category: Organism Names
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    , Botrylloides violaceusbotrylloides violaceusSubject Category: Organism Names
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    , BotryllusbotryllusSubject Category: Organism Names
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    , Botryllus schlosseribotryllus schlosseriSubject Category: Organism Names
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    , StyelidaestyelidaeSubject Category: Organism Names
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    , TunicatatunicataSubject Category: Organism Names
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    Descriptor(s) : aquatic animalsaquatic animalsSubject Category: Organism Groups
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    , aquatic invertebratesaquatic invertebratesSubject Category: Organism Groups
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    , aquatic organismsaquatic organismsSubject Category: Organism Groups
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    , growthgrowthSubject Category: Natural Processes
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    , reproductionreproductionSubject Category: Miscellaneous
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    , salinitysalinitySubject Category: Properties
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    , shellfishshellfishSubject Category: Organism Groups
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    , survivalsurvivalSubject Category: Miscellaneous
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    , temperaturetemperatureSubject Category: Properties
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    , tolerancetoleranceSubject Category: Properties
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    Identifier(s) : aquatic species, Pleurogona, Stolidobranchia

    Geographical Location(s) : British Columbiabritish columbiaSubject Category: Geographic Entities
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    , CanadacanadaSubject Category: Geographic Entities
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    Broader term(s) : TunicatatunicataSubject Category: Organism Names
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    , ChordatachordataSubject Category: Organism Names
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    , animalsanimalsSubject Category: Organism Names
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    , eukaryoteseukaryotesSubject Category: Organism Names
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    , AscidiaceaascidiaceaSubject Category: Organism Names
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    , BotryllidaebotryllidaeSubject Category: Organism Names
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    , BotrylloidesbotrylloidesSubject Category: Organism Names
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    , StyelidaestyelidaeSubject Category: Organism Names
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    , BotryllusbotryllusSubject Category: Organism Names
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    , CanadacanadaSubject Category: Geographic Entities
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    , APEC countriesapec countriesSubject Category: Institutions and Organisations
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    , Commonwealth of Nationscommonwealth of nationsSubject Category: Institutions and Organisations
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    , Developed Countriesdeveloped countriesSubject Category: Miscellaneous
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    , North Americanorth americaSubject Category: Geographic Entities
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    , AmericaamericaSubject Category: Geographic Entities
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    , OECD Countriesoecd countriesSubject Category: Institutions and Organisations
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