Global Salmonidae introductions reveal stronger ecological effects of changing intraspecific compared to interspecific diversity

Buoro, Mathieu; Olden, Julian D.; Cucherousset, Julien

doi:10.1111/ele.12673

Cited by 47 publications

(49 citation statements)

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“…While these results suggest that both ‘native’ and ‘non‐native’ invasions can indeed impact native species ( cf . Buoro et al., ), they indicate that the impacts might differ between the invasion types (i.e. native vs. non‐native).…”

Section: Discussionmentioning

confidence: 99%

“…When an introduced species establishes a population, then ecological impacts on native species can be incurred through competitive interactions (Gozlan, Britton, Cowx, & Copp, 2010). These impacts can be particularly strong where the invader and native species are closely related (Li et al, 2015;Ricciardi & Atkinson, 2004) or functionally similar (Dick et al, 2016(Dick et al, , 2017, as the species are more likely to be foraging on the same food resources (Buoro, Olden, & Cucherousset, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Trophic consequences of introduced species: Comparative impacts of increased interspecific versus intraspecific competitive interactions

et al. 2017

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Invasive species can cause substantial ecological impacts on native biodiversity. While ecological theory attempts to explain the processes involved in the trophic integration of invaders into native food webs and their competitive impacts on resident species, results are equivocal. In addition, quantifying the relative strength of impacts from non‐native species (interspecific competition) versus the release of native conspecifics (intraspecific competition) is important but rarely completed.Two model non‐native fishes, the globally invasive Cyprinus carpio and Carassius auratus, and the model native fish Tinca tinca, were used in a pond experiment to test how increased intra‐ and interspecific competition influenced trophic niches and somatic growth rates. This was complemented by samples collected from three natural fish communities where the model fishes were present. The isotopic niche, calculated using stable isotope data, represented the trophic niche.The pond experiment used additive and substitutive treatments to quantify the trophic niche variation that resulted from intra‐ and interspecific competitive interactions. Although the trophic niche sizes of the model species were not significantly altered by any competitive treatment, they all resulted in patterns of interspecific niche divergence. Increased interspecific competition caused the trophic niche of T. tinca to shift to a significantly higher trophic position, whereas intraspecific competition caused its position to shift towards elevated δ13C. These patterns were independent of impacts on fish growth rates, which were only significantly altered when interspecific competition was elevated.In the natural fish communities, patterns of trophic niche partitioning between the model fishes was evident, with no niche sharing. Comparison of these results with those of the experiment revealed the most similar results between the two approaches were for the niche partitioning between sympatric T. tinca and C. carpio.These results indicate that trophic niche divergence facilitates the integration of introduced species into food webs, but there are differences in how this manifests between introductions that increase inter‐ and intraspecific competition. In entirety, these results suggest that the initial ecological response to an introduction appears to be a trophic re‐organisation of the food web that minimises the trophic interactions between competing species. A plain language summary is available for this article.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Trophic consequences of introduced species: Comparative impacts of increased interspecific versus intraspecific competitive interactions

et al. 2017

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“…Defining the impact of non‐native species at multiple levels of biological organization is a major challenge in ecology (Cucherousset & Olden ; Essl et al . ; Buoro, Cucherousset & Olden ). The novel findings from this study, which uniquely combines a wide range of measures from the field with standardized estimates in the laboratory, suggest that coexistence with a non‐native species result in the breakdown of an adaptive phenotypic syndrome and an associated reduction in fitness of the exposed native population.…”

Section: Resultsmentioning

confidence: 99%

“…Biological invasions are major human‐induced environmental changes, causing intense selection and rapid adaptation in various organisms (Colautti & Lau ). The impacts of non‐native invasive species can affect all levels of biological organization, ranging from genes to whole ecosystems (Cucherousset & Olden ; Buoro, Cucherousset & Olden ). Coexistence with a non‐native species has been shown to induce changes in behavior (Blanchet et al .…”

Section: Introductionmentioning

confidence: 99%

Co‐existence with non‐native brook trout breaks down the integration of phenotypic traits in brown trout parr

et al. 2017

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Summary A phenotypic syndrome refers to complex patterns of integration among functionally related traits in an organism that defines how the organism interacts with its environment and sustains itself. Human‐induced biological invasions have become important sources of environmental modifications. However, the extent to which invasive species affect the phenotypic syndromes of individuals in a native is currently unknown. Such knowledge has important implications for understanding ecological interactions and the management of biological invasions. Here, field monitoring in a natural stream were combined with standardized estimates of behavioral, physiological and morphological traits to address the hypothesis that coexistence with a non‐native invader induces a novel environmental pressure that disrupts the adaptive integration among phenotypic traits of the native species. We compared the strength of integration among key phenotypic traits (i.e. aerobic scope, standard metabolic rate, body growth, activity, and body shape) and ecological niche traits (i.e. spring and summer diet, home range size, daily movements) of an allopatric group of native brown trout (Salmo trutta) with a group of brown trout living in sympatry with non‐native brook trout (Salvelinus fontinalis). We found that the integration of phenotypic traits was substantially reduced in the sympatric brown trout and that allopatric and sympatric brown trout differed in key phenotypic and ecological niche traits. Brown trout living in sympatry with non‐native brook trout consumed more terrestrial prey, had smaller home ranges, and a stouter body shape. Sympatric brown trout also had lower specific growth rate, suggesting a lower fitness. The results are generally in line with our hypothesis suggesting that the reduction in fitness observed in sympatric brown trout is caused by the breakdown of their adaptive phenotypic syndrome. This may be caused by differences in the plasticity of the response of phenotypic traits to the novel selection pressure induced by the non‐native species. Our results may help explaining deleterious effects of non‐native species reported in the absence of direct competition with the native species. A http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.12862/suppinfo is available for this article.

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“…Invasion probability is also increased when the introduced species expresses their traits and behaviours in a similar manner to populations in their natural range (Buoro, Olden, & Cucherousset, 2016;Duncan & Williams, 2002;Ricciardi & Mottiar, 2006 (Cowx et al, 2001). If future studies require increased numbers of larval fishes in their analyses, then an alternative sampling method would be required, such as point abundance sampling using electric fishing.…”

Section: Discussionmentioning

confidence: 99%

Quantifying trophic interactions and niche sizes of juvenile fishes in an invaded riverine cyprinid fish community

Roberts

Britton

2018

Ecology of Freshwater Fish

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Quantifying feeding interactions between nonindigenous and indigenous fishes ininvaded fish communities is important for determining how introduced species integrate into native food webs. Here, the trophic interactions of invasive 0+ European barbel Barbus barbus (L.) and the three other principal 0+ fishes in the community, Squalius cephalus (L.), Leuciscus leuciscus (L.) and Phoxinus phoxinus (L.), were investigated in the River Teme, a River Severn tributary in Western England. B. barbus has been present in the River Teme for approximately 40 years. Analyses of stomach contents from samples collected from three sites between June and September 2015revealed that, overall, fishes displayed a generalist feeding strategy, with most prey having low frequency of selection. Relationships of diet composition versus body length and gape height were species-specific, with increasing dietary specialisms apparent as the 0+ fishes increased in length and gape height. The trophic niche size of invasive B. barbus was always significantly smaller than S. cephalus and L. leuciscus and was significantly smaller than P. phoxinus at two sites. This was primarily due to differences in the functional morphology of the fishes; 0+ B. barbus were generally restricted to foraging on the benthos, whereas the other fishes were able to forage on prey present throughout the water column. Nevertheless, the invasive B. barbus were exploiting very similar prey items to populations in their native range, suggesting these invaders were strongly pre-adapted to the River Teme and this arguably facilitated their establishment and invasion. K E Y W O R D S invasion, nonindigenous, stomach contents analysis, trophic niche S U PP O RTI N G I N FO R M ATI O N Additional Supporting Information may be found online in the supporting information tab for this article. How to cite this article: Gutmann Roberts C, Britton JR. Quantifying trophic interactions and niche sizes of juvenile fishes in an invaded riverine cyprinid fish community. Ecol Freshw Fish. 2018;27:976-987.

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Global Salmonidae introductions reveal stronger ecological effects of changing intraspecific compared to interspecific diversity

Cited by 47 publications

References 46 publications

Trophic consequences of introduced species: Comparative impacts of increased interspecific versus intraspecific competitive interactions

Trophic consequences of introduced species: Comparative impacts of increased interspecific versus intraspecific competitive interactions

Co‐existence with non‐native brook trout breaks down the integration of phenotypic traits in brown trout parr

Quantifying trophic interactions and niche sizes of juvenile fishes in an invaded riverine cyprinid fish community

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