Comparative dietary ecology of turtles (Chelodina burrungandjii and Emydura victoriae) across the Kimberley Plateau, Western Australia, prior to the arrival of cane toads

Nancy FitzSimmons, Anton Tucker

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Food webs in north-western Australian rivers exist in dynamic environments and will be influenced by land use practices, invasion of toxic cane toads (Rhinella marina) and the effects of climate change on river flows. Baseline studies are needed to understand aquatic food webs before these impacts. In the present study, we investigated the diets of two turtles (Emydura victoriae and Chelodina burrungandjii) in four upland rivers across a gradient of rainfall and land uses in the Kimberley Plateau of Western Australia. We captured turtles by snorkelling and recovered their prey by stomach lavage. We enumerated 2720 prey items from 390 E. victoriae samples and 308 prey items from 155 C. burrungandjii samples. Prey compositions distinguished E. victoriae as an omnivorous generalist relying on a diversity of animal and plant prey and C. burrungandjii as a piscivorous specialist, but with both species as likely predators of toxic cane toad eggs or tadpoles. Comparisons among the rivers showed variation in diets for both species that reflect differences in prey availability and location-specific food webs. Terrestrially based food sources were observed in 26% of E. victoriae samples and 3% of C. burrungandjii samples, which indicates the importance of the aquatic-terrestrial interface and land use practices within these rivers.
    Original languageEnglish
    Pages (from-to)1611-1624
    Number of pages14
    JournalMarine and Freshwater Research
    Volume67
    Issue number11
    DOIs
    Publication statusPublished - 2016

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    Victoria (Australia)
    Bufo marinus
    toad
    turtle
    Western Australia
    turtles
    plateaus
    plateau
    ecology
    food web
    rivers
    land use
    river
    prey location
    food webs
    diet
    prey availability
    aquatic food webs
    sampling
    marina

    Cite this

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    abstract = "Food webs in north-western Australian rivers exist in dynamic environments and will be influenced by land use practices, invasion of toxic cane toads (Rhinella marina) and the effects of climate change on river flows. Baseline studies are needed to understand aquatic food webs before these impacts. In the present study, we investigated the diets of two turtles (Emydura victoriae and Chelodina burrungandjii) in four upland rivers across a gradient of rainfall and land uses in the Kimberley Plateau of Western Australia. We captured turtles by snorkelling and recovered their prey by stomach lavage. We enumerated 2720 prey items from 390 E. victoriae samples and 308 prey items from 155 C. burrungandjii samples. Prey compositions distinguished E. victoriae as an omnivorous generalist relying on a diversity of animal and plant prey and C. burrungandjii as a piscivorous specialist, but with both species as likely predators of toxic cane toad eggs or tadpoles. Comparisons among the rivers showed variation in diets for both species that reflect differences in prey availability and location-specific food webs. Terrestrially based food sources were observed in 26{\%} of E. victoriae samples and 3{\%} of C. burrungandjii samples, which indicates the importance of the aquatic-terrestrial interface and land use practices within these rivers.",
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    AU - Tucker, Anton

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    N2 - Food webs in north-western Australian rivers exist in dynamic environments and will be influenced by land use practices, invasion of toxic cane toads (Rhinella marina) and the effects of climate change on river flows. Baseline studies are needed to understand aquatic food webs before these impacts. In the present study, we investigated the diets of two turtles (Emydura victoriae and Chelodina burrungandjii) in four upland rivers across a gradient of rainfall and land uses in the Kimberley Plateau of Western Australia. We captured turtles by snorkelling and recovered their prey by stomach lavage. We enumerated 2720 prey items from 390 E. victoriae samples and 308 prey items from 155 C. burrungandjii samples. Prey compositions distinguished E. victoriae as an omnivorous generalist relying on a diversity of animal and plant prey and C. burrungandjii as a piscivorous specialist, but with both species as likely predators of toxic cane toad eggs or tadpoles. Comparisons among the rivers showed variation in diets for both species that reflect differences in prey availability and location-specific food webs. Terrestrially based food sources were observed in 26% of E. victoriae samples and 3% of C. burrungandjii samples, which indicates the importance of the aquatic-terrestrial interface and land use practices within these rivers.

    AB - Food webs in north-western Australian rivers exist in dynamic environments and will be influenced by land use practices, invasion of toxic cane toads (Rhinella marina) and the effects of climate change on river flows. Baseline studies are needed to understand aquatic food webs before these impacts. In the present study, we investigated the diets of two turtles (Emydura victoriae and Chelodina burrungandjii) in four upland rivers across a gradient of rainfall and land uses in the Kimberley Plateau of Western Australia. We captured turtles by snorkelling and recovered their prey by stomach lavage. We enumerated 2720 prey items from 390 E. victoriae samples and 308 prey items from 155 C. burrungandjii samples. Prey compositions distinguished E. victoriae as an omnivorous generalist relying on a diversity of animal and plant prey and C. burrungandjii as a piscivorous specialist, but with both species as likely predators of toxic cane toad eggs or tadpoles. Comparisons among the rivers showed variation in diets for both species that reflect differences in prey availability and location-specific food webs. Terrestrially based food sources were observed in 26% of E. victoriae samples and 3% of C. burrungandjii samples, which indicates the importance of the aquatic-terrestrial interface and land use practices within these rivers.

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    KW - Cheloniidae

    KW - Drysdale River

    KW - Fitzroy River

    KW - Isdell River

    KW - King Edward River

    KW - Testudines

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