Using environmental niche models to elucidate drivers of the American bullfrog invasion in California

Nelson, Nicolette L.; Piovia‐Scott, Jonah

doi:10.1007/s10530-022-02744-3

Cited by 4 publications

(1 citation statement)

References 53 publications

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“…4) that includes an invasive species, Lithobates catesbeianus (also directly with the occurrence distribution of this species; Data file 3). The healthier northern and eastern regions with high FEve and FDiv values might ward off the spread of the invasive species, although it can easily occupy mountainous habitats 41,42 . The ecosystems of the southern and western regions, on the other hand, are relatively less functional except some restricted regions along the south and west coast (including Jejudo Island) harboring a few unique species.…”

Section: Discussionmentioning

confidence: 99%

Functional group analyses of herpetofauna in South Korea using a large dataset

2023

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Functional traits are characteristics of species that affect their fitness and ecosystem, and they greatly influence ecological niches. Thus, biodiversity assessment based on functional groups rather than species per se can more realistically reflect the ecological niche space. As essential players of ecosystem functions, herpetofauna are appropriate subjects of functional trait-based analyses. In this study, using a nationwide dataset and applying trait information and ecological niche modeling, the richness within each functional group, and the taxonomic and functional diversity indices of South Korean herpetofauna were visualized to identify and compare the geographic distributions. The results revealed that the reptile community seemed more locally diverse with more overlapping randomized patterns among groups than amphibians, while amphibians showed wider distributions and a higher within-grid occurrence ratio. Functional diversity indices of reptiles also showed more randomized geographic patterns with higher levels at Jejudo Island than amphibians. The findings of this study may help to identify biodiversity hot spots and understand its ecosystem health. Increasing survey data and trait information will improve the assessment.

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Section: Discussionmentioning

confidence: 99%

Functional group analyses of herpetofauna in South Korea using a large dataset

2023

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Large-landscape connectivity models for pond-dwelling species: methods and application to two invasive amphibians of global concern

Vimercati,

Rödder,

Vuilleumier

et al. 2024

Landsc Ecol

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Context Functional connectivity models are essential in identifying major dispersal pathways and developing effective management strategies for expanding populations of invasive alien species. However, the extrapolation of models parameterized within current invasive ranges may not be applicable even to neighbouring areas, if the models are not based on the expected responses of individuals to landscape structure. Objectives We have developed a high-resolution connectivity model for both terrestrial and aquatic habitats using solely potential sources. The model is used here for the invasive, principally-aquatic, African clawed frog Xenopus laevis, which is a species of global concern. Methods All ponds were considered as suitable habitats for the African clawed frog. Resistance costs of lotic aquatic and terrestrial landscape features were determined through a combination of remote sensing and laboratory trials. Maximum cumulative resistance values were obtained via capture-mark-recapture surveys, and validation was performed using independently collected presence data. We applied this approach to an invasive population of the American bullfrog, Lithobates catesbeianus, in France to assess its transferability to other pond-dwelling species. Results The model revealed areas of high and low functional connectivity. It primarily identified river networks as major dispersal pathways and pinpointed areas where local connectivity could be disrupted for management purposes. Conclusion Our model predicts how the dispersal of individuals connect suitable lentic habitats, through river networks and different land use types. The approach can be applied to species of conservation concern or interest in pond ecosystems and other wetlands, including aquatic insects, birds and mammals, for which distribution data are limited or challenging to collect. It serves as a valuable tool for forecasting colonization pathways in expanding populations of both native and invasive alien species and for identifying regions suitable for preventive or adaptive control measures.

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