Changes in aquatic communities recently invaded by a top predator: evidence of American bullfrogs in Aceguá, Uruguay

Gobel, Noelia; Laufer, Gabriel; Cortizas, Sofía

doi:10.1007/s00027-018-0604-1

Cited by 14 publications

(19 citation statements)

References 66 publications

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“…catesbeianus can eat any animals smaller than itself ( Adriaens, Devisscher & Louette, 2013 ). Consequently, introduced bullfrogs have negatively affected native arthropods and amphibians through direct predation in invaded areas ( Kats & Ferrer, 2003 ; Li et al, 2011 ; Adriaens, Devisscher & Louette, 2013 ; Gobel, Laufer & Cortizas, 2019 ; Groffen et al, 2019 ; Nakamura & Tominaga, 2021 ). Although the native bombardier beetle Ph .…”

Section: Discussionmentioning

confidence: 99%

“…Because bullfrog adults commonly reach a size (snout–vent length) of 180–200 mm ( Werner, Wellborn & McPeek, 1995 ), they are able to swallow small vertebrates ( e.g ., fish, mammals, reptiles, and frogs) as well as invertebrates ( Raney & Ingram, 1941 ; Stewart & Sandison, 1972 ; Bruneau & Magnin, 1980 ; Clarkson & DeVos, 1986 ; Govindarajulu, Price & Anholt, 2006 ; Flynn, Kreofsky & Sepulveda, 2017 ; Oda et al, 2019 ). Consequently, invasive bullfrogs have impacted native communities in invaded habitats ( Kats & Ferrer, 2003 ; Li et al, 2011 ; Adriaens, Devisscher & Louette, 2013 ; Gobel, Laufer & Cortizas, 2019 ). Therefore, L .…”

Section: Introductionmentioning

confidence: 99%

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Bombardier beetles repel invasive bullfrogs

Sugiura¹,

Date²

2022

PeerJ

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Invasive non-native predators negatively affect native species; however, some native species can survive the predation pressures of invasive species by using pre-existing antipredator strategies or evolving defenses against invasive predators. The American bullfrog Lithobates catesbeianus (Anura: Ranidae) has been intentionally introduced to many countries and regions, and has impacted native animals through direct predation. Bombardier beetles (Coleoptera: Carabidae: Brachininae: Brachinini) discharge chemicals at a temperature of approximately 100 °C from the tip of the abdomen when they are attacked by predators. This “bombing” can successfully repel predators. However, adults of a native bombardier beetle Pheropsophus (Stenaptinus) occipitalis jessoensis have been reportedly found in the gut contents of the introduced bullfrog L. catesbeianus in Japan. These records suggest that the invasive bullfrog L. catesbeianus attacks the native bombardier beetle P. occipitalis jessoensis under field conditions in Japan; however, the effectiveness of the bombing defense against invasive bullfrogs is unclear. To test the effectiveness of the bombing defense against bullfrogs, we investigated the behavioral responses of L. catesbeianus juveniles to P. occipitalis jessoensis adults under laboratory conditions. Contrary to previous gut content results, almost all the bullfrogs (96.3%) rejected bombardier beetles before swallowing them; 88.9% rejected the beetles after being bombed, and 7.4% stopped attacking the beetles before being bombed. Only 3.7% successfully swallowed and digested the beetle. All of the beetles collected from non-bullfrog-invaded sites could deter bullfrogs, suggesting that the pre-existing defenses of bombardier beetles played an essential role in repelling bullfrogs. When treated beetles that were unable to discharge hot chemicals were provided, 77.8% of bullfrogs successfully swallowed and digested the treated beetles. These results indicate that bombing is important for the successful defense of P. occipitalis jessoensis against invasive bullfrogs. Although invasive bullfrogs have reportedly impacted native insect species, P. occipitalis jessoensis has an existing defense mechanism strong enough to repel the invasive predators.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bombardier beetles repel invasive bullfrogs

Sugiura¹,

Date²

2022

PeerJ

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“…Lithobates catesbeianus) to become a driver of ecological trophic cascades in naive ecosystems (e.g. Gobel et al 2019). Such issues are well known from other taxa, yet the lack of monitoring and the number of cryptic species underscores the under-appreciated risks associated with hybridisation of these as yet unrecognised frog species.…”

Section: Taxonomic Uncertainties Interbreedingmentioning

confidence: 99%

Numerous uncertainties in the multifaceted global trade in frogs’ legs with the EU as the major consumer

Auliya¹,

Altherr²,

Nithart³

et al. 2023

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The commercial trade in frogs and their body parts is global, dynamic and occurs in extremely large volumes (in the thousands of tonnes/yr or billions of frogs/yr). The European Union (EU) remains the single largest importer of frogs’ legs, with most frogs still caught from the wild. Amongst the many drivers of species extinction or population decline (e.g. due to habitat loss, climate change, disease etc.), overexploitation is becoming increasingly more prominent. Due to global declines and extinctions, new attention is being focused on these markets, in part to try to ensure sustainability. While the trade is plagued by daunting realities of data deficiency and uncertainty and the conflicts of commercial interests associated with these data, it is clear is that EU countries are most responsible for the largest portion of the international trade in frogs’ legs of wild species. Over decades of exploitation, the EU imports have contributed to a decline in wild frog populations in an increasing number of supplying countries, such as India and Bangladesh, as well as Indonesia, Turkey and Albania more recently. However, there have been no concerted attempts by the EU and present export countries to ensure sustainability of this trade. Further work is needed to validate species identities, secure data on wild frog populations, establish reasonable monitored harvest/export quotas and disease surveillance and ensure data integrity, quality and security standards for frog farms. Herein, we call upon those countries and their representative governments to assume responsibility for the sustainability of the trade. The EU should take immediate action to channel all imports through a single centralised database and list sensitive species in the Annexes of the EU Wildlife Trade Regulation. Further, listing in CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora) can enforce international trade restrictions. More joint efforts are needed to improve regional monitoring schemes before the commercial trade causes irreversible extinctions of populations and species of frogs.

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“…Leuenberger et al 2014). In addition to these concerns is the potential for an invasive species (e.g., Lithobates catesbianus) to become a driver of ecological trophic cascades in naive ecosystems (e.g., Gobel et al 2019). Such issues are well known from other taxa, yet the lack of monitoring and the number of cryptic species underscores the under-appreciated risks associated with hybridization of these as yet unrecognized frog species.…”

Section: Taxonomic Uncertainties Interbreedingmentioning

confidence: 99%

Numerous uncertainties in the multifaceted global trade in frogs’ legs with the EU as the major consumer

Auliya¹,

Altherr²,

Nithart³

et al. 2022

Preprint

View full text Add to dashboard Cite

The commercial trade in frogs and their body parts is global, dynamic, and occurs in extremely large volumes (in the thousands of tonnes/yr or billions of frogs/yr). The European Union remains the single largest importer of frogs’ legs, with most frogs still caught from the wild. Among the many drivers of species extinction or population decline (e.g., due to habitat loss, climate change, disease, etc.), overexploitation is becoming increasingly more prominent. Because ofglobal declines and extinctions, new attention is being focused on these markets, in part to try to ensure sustainability. While the trade is plagued by daunting realities of data deficiency and uncertainty, and the conflicts of commercial interests associated with these data, one of the only things that is clear is that EU countries are most responsible for the largest portion the international trade in frogs’ legs of wild species. Over decades of exploitation, the EU imports have contributed to a decline in wild frog populations in an increasing number of supplying countries, such as India and Bangladesh, as well as Indonesia, Turkey, and Albania more recently. However, there have been no concerted attempts by the EU and the export countries to ensure sustainability of this trade. Further work is needed to validate species identities, secure data on wild frog populations, establish reasonable monitored harvest/export quotas and disease surveillance, and ensure data integrity, quality, and security standards for frog farms. Herein, we call upon those countries and their representative governments, to assume responsibility for the sustainability of the trade. The EU should take immediate action to channel all imports through a single centralized database and list sensitive species in the Annexes of the EU Wildlife Trade Regulation. Further listing in CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora) can enforce international trade restrictions. More joint-efforts are needed to improve regional monitoring schemes before the commercial trade causes irreversible extinctions of populations and species of frogs.

show abstract

Changes in aquatic communities recently invaded by a top predator: evidence of American bullfrogs in Aceguá, Uruguay

Cited by 14 publications

References 66 publications

Bombardier beetles repel invasive bullfrogs

Bombardier beetles repel invasive bullfrogs

Numerous uncertainties in the multifaceted global trade in frogs’ legs with the EU as the major consumer

Numerous uncertainties in the multifaceted global trade in frogs’ legs with the EU as the major consumer

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Changes in aquatic communities recently invaded by a top predator: evidence of American bullfrogs in Aceguá, Uruguay

Cited by 14 publications

References 66 publications

Bombardier beetles repel invasive bullfrogs

Bombardier beetles repel invasive bullfrogs

﻿Numerous uncertainties in the multifaceted global trade in frogs’ legs with the EU as the major consumer

Numerous uncertainties in the multifaceted global trade in frogs&rsquo; legs with the EU as the major consumer

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Numerous uncertainties in the multifaceted global trade in frogs’ legs with the EU as the major consumer

Numerous uncertainties in the multifaceted global trade in frogs’ legs with the EU as the major consumer