Environmental correlates of food-chain length, mean trophic level and trophic level variance in invaded riverine fish assemblages

A. Maceda-Veiga, R. Mac Nally, A. de Sostoa

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Examining how the trophic structure of biotic assemblages is affected by human impacts, such as habitat degradation and the introduction of alien species, is important for understanding the consequences of such impacts on ecosystem functioning. We used general linear mixed models and hierarchical partitioning analyses of variance to examine for the first time the applicability of three hypotheses (ecosystem-size, productivity and disturbance) for explaining food-chain length (FCL) in invaded fish assemblages. We used Fishbase trophic level (TL) estimates for 16 native and 18 alien fish species in an extensive riverine system in north-eastern Spain (99,700 km2, 15 catchments, 530 sites). The FCL of assemblages ranged from2.7 to 4.42. Ecosystemsize-related variables Strahler stream order, physical habitat diversity) and human-disturbance (conductivity) made the largest contribution to the explained variance in the FCL model after accounting for spatial confounding factors and collinearity among
    predictors. Within-assemblage TL also was positively associated with Strahler streamorder, suggesting that large rivers have the highest trophic diversity. High conductivity was negatively associated with FCL, as did with the mean TL of fish assemblages. However, an inverse association was found between mean TL and Strahler stream order, possibly because the presence of fish species of high TL may be offset by larger numbers of alien species of lower TL in large rivers. Given that there may be trophic replacements among native and alien species, this inference needs to be addressed with detailed trophic studies. However, reducing water conductivity by improved wastewater treatment and better agricultural practices probably would help to conserve the fish species on
    the apices of aquatic food-webs.
    Original languageUndefined
    Pages (from-to)420-429
    Number of pages10
    JournalScience of the Total Environment
    Volume644
    DOIs
    Publication statusPublished - 2018

    Cite this

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    abstract = "Examining how the trophic structure of biotic assemblages is affected by human impacts, such as habitat degradation and the introduction of alien species, is important for understanding the consequences of such impacts on ecosystem functioning. We used general linear mixed models and hierarchical partitioning analyses of variance to examine for the first time the applicability of three hypotheses (ecosystem-size, productivity and disturbance) for explaining food-chain length (FCL) in invaded fish assemblages. We used Fishbase trophic level (TL) estimates for 16 native and 18 alien fish species in an extensive riverine system in north-eastern Spain (99,700 km2, 15 catchments, 530 sites). The FCL of assemblages ranged from2.7 to 4.42. Ecosystemsize-related variables Strahler stream order, physical habitat diversity) and human-disturbance (conductivity) made the largest contribution to the explained variance in the FCL model after accounting for spatial confounding factors and collinearity amongpredictors. Within-assemblage TL also was positively associated with Strahler streamorder, suggesting that large rivers have the highest trophic diversity. High conductivity was negatively associated with FCL, as did with the mean TL of fish assemblages. However, an inverse association was found between mean TL and Strahler stream order, possibly because the presence of fish species of high TL may be offset by larger numbers of alien species of lower TL in large rivers. Given that there may be trophic replacements among native and alien species, this inference needs to be addressed with detailed trophic studies. However, reducing water conductivity by improved wastewater treatment and better agricultural practices probably would help to conserve the fish species onthe apices of aquatic food-webs.",
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    Environmental correlates of food-chain length, mean trophic level and trophic level variance in invaded riverine fish assemblages. / Maceda-Veiga, A.; Mac Nally, R.; de Sostoa, A.

    In: Science of the Total Environment, Vol. 644, 2018, p. 420-429.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AU - Maceda-Veiga, A.

    AU - Mac Nally, R.

    AU - de Sostoa, A.

    N1 - cited By 0

    PY - 2018

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    N2 - Examining how the trophic structure of biotic assemblages is affected by human impacts, such as habitat degradation and the introduction of alien species, is important for understanding the consequences of such impacts on ecosystem functioning. We used general linear mixed models and hierarchical partitioning analyses of variance to examine for the first time the applicability of three hypotheses (ecosystem-size, productivity and disturbance) for explaining food-chain length (FCL) in invaded fish assemblages. We used Fishbase trophic level (TL) estimates for 16 native and 18 alien fish species in an extensive riverine system in north-eastern Spain (99,700 km2, 15 catchments, 530 sites). The FCL of assemblages ranged from2.7 to 4.42. Ecosystemsize-related variables Strahler stream order, physical habitat diversity) and human-disturbance (conductivity) made the largest contribution to the explained variance in the FCL model after accounting for spatial confounding factors and collinearity amongpredictors. Within-assemblage TL also was positively associated with Strahler streamorder, suggesting that large rivers have the highest trophic diversity. High conductivity was negatively associated with FCL, as did with the mean TL of fish assemblages. However, an inverse association was found between mean TL and Strahler stream order, possibly because the presence of fish species of high TL may be offset by larger numbers of alien species of lower TL in large rivers. Given that there may be trophic replacements among native and alien species, this inference needs to be addressed with detailed trophic studies. However, reducing water conductivity by improved wastewater treatment and better agricultural practices probably would help to conserve the fish species onthe apices of aquatic food-webs.

    AB - Examining how the trophic structure of biotic assemblages is affected by human impacts, such as habitat degradation and the introduction of alien species, is important for understanding the consequences of such impacts on ecosystem functioning. We used general linear mixed models and hierarchical partitioning analyses of variance to examine for the first time the applicability of three hypotheses (ecosystem-size, productivity and disturbance) for explaining food-chain length (FCL) in invaded fish assemblages. We used Fishbase trophic level (TL) estimates for 16 native and 18 alien fish species in an extensive riverine system in north-eastern Spain (99,700 km2, 15 catchments, 530 sites). The FCL of assemblages ranged from2.7 to 4.42. Ecosystemsize-related variables Strahler stream order, physical habitat diversity) and human-disturbance (conductivity) made the largest contribution to the explained variance in the FCL model after accounting for spatial confounding factors and collinearity amongpredictors. Within-assemblage TL also was positively associated with Strahler streamorder, suggesting that large rivers have the highest trophic diversity. High conductivity was negatively associated with FCL, as did with the mean TL of fish assemblages. However, an inverse association was found between mean TL and Strahler stream order, possibly because the presence of fish species of high TL may be offset by larger numbers of alien species of lower TL in large rivers. Given that there may be trophic replacements among native and alien species, this inference needs to be addressed with detailed trophic studies. However, reducing water conductivity by improved wastewater treatment and better agricultural practices probably would help to conserve the fish species onthe apices of aquatic food-webs.

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    JO - Science of the Total Environment

    JF - Science of the Total Environment

    SN - 0048-9697

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