Rainfall stochasticity controls the distribution of invasive crayfish and its impact on amphibian guilds in Mediterranean temporary waters

Díaz‐Paniagua, Carmen; Keller, Claudia; Florencio, Margarita; Andreu, Ana C.; Portheault, Alexandre; Gómez‐Rodríguez, Carola; Gómez-Mestre, Iván

doi:10.1007/s10750-014-1808-6

Cited by 10 publications

(9 citation statements)

References 31 publications

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“…Previous studies showed negative effects of invasive crayfish on amphibian dynamics of patch occupancy, abundance, species richness, and reproductive rates (Arribas et al., 2015; Cruz et al., 2006; Falaschi et al., 2021; Kats et al., 2013). Even if newts seem to be particularly affected by the presence of invasive crayfish (Arribas et al., 2014; Díaz‐Paniagua et al., 2014; Ficetola et al., 2011), we are not aware of studies analysing crayfish impacts on the long‐term dynamics of newt abundance. We found a negative impact of crayfish on population dynamics of Italian crested newts while we did not detect clear effects on smooth newts.…”

Section: Discussionmentioning

confidence: 99%

Explaining declines of newt abundance in northern Italy

et al. 2022

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Amphibians are an exemplary case of the current biodiversity crisis, being among the vertebrates suffering the fastest decline. Population dynamics of amphibians can result from processes acting at different scales. Both the local characteristics of breeding wetlands and the features of the surrounding landscape can strongly affect the temporal dynamics of amphibian populations. European newts are particularly threatened by land‐use change and invasive alien species. While it is known that newts are declining across Europe, few studies have performed broad‐scale assessments of their decline, either because abundance dynamics are more complex to analyse than presence/absence data or because they require a high sampling effort and long‐term monitoring. In this study, we show that long‐term distribution data can be combined with demographic models to quantify the decline in abundance of newt species at the regional scale, and to assess the importance of multiple factors in determining abundance dynamics. We performed multiple surveys between 1996 and 2020 and used N‐mixture models in a Bayesian framework. We then calculated abundance changes between the first and the last sampling season, which were performed with an average timespan of 13 years across all wetlands. Both Italian crested newts and smooth newts showed large declines, with an average estimated abundance loss between the first and last sampling season of 57% and 63%, respectively. Local characteristics of the wetlands were the main determinants of abundance dynamics: the abundance of both species showed a positive relationship with the area and the permanence of the wetland and a negative relationship with the presence of fish. Additionally, the abundance of Italian crested newts was negatively related to the presence of invasive crayfish. No relationship was detected between abundance and terrestrial habitat availability or connectivity measures. Despite uncertainties in the absolute values of estimated abundance, the striking regional‐scale decline of newts is evident. Among the major determinants of population dynamics, fish and crayfish presence increased their prevalence in the study area, while other factors remained more stable. Management actions aimed at eradicating or controlling invasive fish and crayfish might halt abundance loss and even revert this declining trend. The application of N‐mixture models to long‐term data from representative sites permits the analysis of temporal trends of species at the regional scale even when data come from complex monitoring schemes. We found large declines in abundance of two newt species, suggesting that European newts may be more threatened than previously thought.

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Section: Discussionmentioning

confidence: 99%

Explaining declines of newt abundance in northern Italy

et al. 2022

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“…Recent studies showed that the preservation of a number of habitats free of invasive species, or the existence of environmental forces that limit populations of this invasive crayfish could promote the maintenance of amphibians in invaded areas (Díaz‐Paniagua et al., ; Kats & Ferrer, ; Kats et al., ). In the RNPB, the spread of red swamp crayfish is limited by the patchy distribution of ponds within a hedgerow landscape (Tréguier et al., ), which is, by contrast, undoubtedly highly suitable for amphibians (high pond densities, preserved woodland habitats, etc.).…”

Section: Discussionmentioning

confidence: 99%

Variable effects of an invasive species on the reproduction and distribution of native species in pond networks

2019

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The arrival of non‐native species in a community can be deleterious for native species. The joint investigation of several descriptors of native populations susceptible to invaders, under different invasion contexts, may help in predicting the outcome of their co‐occurrence with invasive species. Moreover, empirical studies seldom document the relative importance of the effects of invasive species on native species compared with other factors. Using survey data, we evaluated whether reproduction (larval density) and distribution of breeding sites of three amphibian species (Rana dalmatina, Lissotriton helveticus, and Triturus marmoratus) were related to the presence of invasive red swamp crayfish Procambarus clarkii, compared to other native predators, habitat, and landscape features, in two pond networks that differed in invasion intensity. The red swamp crayfish was only negatively associated with the larval density of one amphibian species studied. Its effect size was similar to that of some native predators, and much smaller than that of the canopy cover of ponds. Amphibians were widespread in the two pond networks. The occupancy of only one species in each network was negatively related to crayfish presence, while the occupancy of all species was negatively related to fish presence. The distribution of amphibian breeding sites was positively associated with aquatic vegetation cover. Negative associations between amphibians and red swamp crayfish were detected only in a few cases, even in the most invaded area, and thus results were less alarming than in previous studies. Differences in ecological traits of native amphibians and interactions with other environmental factors may explain the variable effects of red swamp crayfish on native amphibian populations.

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“…The exotic weevil was never detected in the southern portion of the park (Fig. 1), where water bodies are few and isolated (see Díaz-Paniagua et al, 2014). In the marsh, two individuals of the exotic weevil were also detected in May 2011, on leaves of A. filiculoides collected from the border of the marsh (Fig.…”

Section: Distribution Of the Exotic Weevilmentioning

confidence: 96%

The exotic weevil Stenopelmus rufinasus Gyllenhal, 1835 (Coleoptera: Curculionidae) across a “host-free” pond network

Florencio¹,

Fernández‐Zamudio²,

Bilton³

et al. 2015

Limnetica

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The exotic weevil Stenopelmus rufinasus Gyllenhal, 1835 (Coleoptera: Curculionidae) across a "host-free" pond network The presence of the exotic weevil Stenopelmus rufinasus (Coleoptera: Curculionidae) is closely related to the occurrence of the exotic red water fern, Azolla filiculoides. In this paper, we present the first records of S. rufinasus in Doñana National Park (SW Spain), based on sampling of macroinvertebrates in 91 temporary ponds, including monthly samples of 22 ponds, during two successive years (2005)(2006)(2007). The exotic weevil was present in 21% of the sampled ponds where the host plant, A. filiculiodes, was not detectable. Because A. filiculoides can reach high densities in an adjacent area of marsh, we suggest that the occurrence of the exotic weevil in these ponds is a consequence of dispersal from nearby marshes. Our study demonstrates that S. rufinasus adults can occur at relatively high densities in ponds where the host plant is not present, suggesting that such apparently "host-free" sites may act as stepping stones for the spread of this species.

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Rainfall stochasticity controls the distribution of invasive crayfish and its impact on amphibian guilds in Mediterranean temporary waters

Cited by 10 publications

References 31 publications

Explaining declines of newt abundance in northern Italy

Explaining declines of newt abundance in northern Italy

Variable effects of an invasive species on the reproduction and distribution of native species in pond networks

The exotic weevil Stenopelmus rufinasus Gyllenhal, 1835 (Coleoptera: Curculionidae) across a “host-free” pond network

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