Functional distance to recipient communities may favour invasiveness: insights from two invasive frogs

Escoriza, Daniel; Ruhí, Albert

doi:10.1111/ddi.12421

Cited by 13 publications

(6 citation statements)

References 128 publications

(138 reference statements)

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“…those that have established overseas (invaders) in terms of their traits and found that overall aliens and native colonizers differed significantly. Another recent study by Escoriza and Ruhí (2016) on two well-known invasive amphibian species, the bullfrog and the cane toad, showed that these invasive species were more functionally distant from the native species in the invaded areas than in their native ranges. More work in this direction is clearly required to identify and quantify potential changes in coexistence mechanisms of invasive species within communities between their native and invaded ranges.…”

Section: ) Integrating Facilitation Mechanisms In Invasion Communitymentioning

confidence: 98%

The community ecology of invasive species: where are we and what's next?

2016

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Alien species are continually introduced in most regions of the world, but not all survive and coexist with the resident native species. Approaches analyzing the functional (or phylogenetic) similarity between invasive species and native communities are increasingly employed to infer the processes underlying successful invasions and to predict future invaders. The relatively simple conceptual foundations have made these approaches very appealing and therefore widely used, often leading to confusion and hampering generalizations. We undertook a comprehensive review and synthesis of the functional similarity approach in invasion community ecology to clarify its advantages and limitations, to summarize what has been learned thus far, and to suggest avenues for future improvement. We first present the methodological state of the art and provide general guidelines. Second, by organizing the published literature around seven key questions in invasion ecology we found cumulative evidence that: at large spatial scales phylogenetic relatedness of invasive and native species is a good predictor of invasion success, but a poor predictor of invasion impacts; at fine spatial scales, community resistance to invasion tends to increase with native species diversity and with similarity to the invaders, consistent with patterns emerging from biotic interactions. In general, the processes filtering invaders appear to vary across species’ invasion stage and along environmental gradients. Nonetheless, we found conflicting evidence for differences in community assembly processes between invasive and native species, and between the invader's native and adventive ranges. Finally, we propose four important avenues for overcoming some of the identified methodological and conceptual limitations of the approach, in particular by integrating observational and experimental analyses and by explicitly considering species’ demographic rates and complex biotic interactions. Although the functional similarity approach bears intrinsic limitations, it still offers many opportunities in invasion community ecology at large spatial scales.

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Section: ) Integrating Facilitation Mechanisms In Invasion Communitymentioning

confidence: 98%

The community ecology of invasive species: where are we and what's next?

2016

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“…Given this broad distribution ( Fig.1), E. johnstonei can be considered one of the most widely and successfully expanding invasive amphibian species, outperformed probably only by the cane toad Rhinella marina (Kaiser 2002, IUCN-GISD 2018 and the American bullfrog Lithobates catesbeianus (Escoriza and Ruhí 2016). Earlier studies suggested that E. johnstonei actively disperses in a process of slow and steady migration events (e.g.…”

Section: Introductionmentioning

confidence: 95%

Whistling invaders: Status and distribution of Johnstone’s Whistling frog (Eleutherodactylus johnstonei Barbour, 1914), 25 years after its introduction to Colombia

Leonhardt¹,

Jiménez-Bolaño²,

Ernst³

2019

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Despite increased attention to the problem of alien amphibian invasions, systematic assessments of the actual invasion status and potential, required to estimate possible environmental and economic impacts of introduced species, are often missing. A prime example is Johnstone’s Whistling Frog (Eleutherodactylusjohnstonei), a Caribbean native that now occurs widely throughout the South American mainland, including Colombia. We conducted the first systematic and comprehensive countrywide assessment of the introduction status of the species in Colombia, combining both intensive field surveys, as well as a first population genetic analysis. The species was strictly confined to urban habitats with specific environmental conditions (plant nurseries and private gardens) and did not show any signs of dispersal into the extra-urban matrix. Genetic data support previously hypothesised independent introduction events in the Andes and along the Caribbean Coast and shed light on potential dispersal pathways. The results of this study challenge both the active spread, as well as the broad environmental tolerance hypothesis previously suggested, to explain the observed range extension. A critical reassessment of the categorisation of the species as highly invasive under IUCN-ISSG standards is required.

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“…Moreover, endangered species may be further threatened by non-native species acting as predators or competitors (Katsanevakis et al, 2014;Wilcove, Rothstein, Dubow, Phillips, & Losos, 1998). Invasion success is predicted to be greater where invaders present novel functional traits, which enables them to exploit marginal or vacant niches and limits interaction potential between native and invasive species (Escoriza & Ruhí, 2016). In contrast, invasion success where host communities include seemingly functionally similar native species can be attributed to just one or two superior traits of the invader, such as greater growth rates or a faster assimilation of nutrients (Krassoi, Brown, Bishop, Kelaher, & Summerhayes, 2008).…”

Section: Introductionmentioning

confidence: 99%

Competition between co‐occurring invasive and native consumers switches between habitats

et al. 2018

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The introduction of a non‐native species frequently has adverse direct effects on native species. The underlying mechanisms, however, often remain unclear, in particular where native and invasive species are taxonomically similar. We found evidence of direct competitive interactions between a globally distributed invasive species (the Pacific oyster, Magallana gigas) and its native counterpart (the European oyster, Ostrea edulis). We also discovered that the competitive outcome differed between different habitat types and orientation by identifying context‐dependent responses driven by environmental conditions and stress (i.e. intertidal compared to subtidal habitats; and vertical versus horizontal substratum). This is particularly important because the European oyster is threatened, or in decline, throughout most of its range, and restoration efforts are underway in many regions. We combined experimental manipulations and stable isotope analysis (SIA) to identify the direct effects of competition and the mechanisms by which the invasive and native species compete. We identified negative effects of the invasive species on the native oyster, but these were limited to the subtidal habitat (lower stress environment) and determined by substratum orientation (habitat structure). Crucially, we found that effects of the invasive species on the native species were not always negative and under certain conditions (e.g. on vertical substrata) were positive. Shifts in isotopic niches of both species when co‐occurring, alongside mixing models, indicate that exploitative competition for food is most likely to underpin niche partitioning between both species. We have identified different foraging strategies under different contexts, and our findings highlight the importance of exploitative competition as a driving mechanism behind the co‐occurrence of two seemingly functionally similar consumers. The combination of experimental manipulations with SIA is a powerful tool, and we illustrate how this approach should be incorporated, into multiple environmental contexts at appropriate scales, to more accurately predict impacts of the spread of invasive species on native communities.

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Functional distance to recipient communities may favour invasiveness: insights from two invasive frogs

Cited by 13 publications

References 128 publications

The community ecology of invasive species: where are we and what's next?

The community ecology of invasive species: where are we and what's next?

Whistling invaders: Status and distribution of Johnstone’s Whistling frog (Eleutherodactylus johnstonei Barbour, 1914), 25 years after its introduction to Colombia

Competition between co‐occurring invasive and native consumers switches between habitats

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