Let’s eat out, there’s crayfish for dinner: American bullfrog niche shifts inside and outside native ranges and the effect of introduced crayfish

Bissattini, Alessandra Maria; Vignoli, Leonardo

doi:10.1007/s10530-017-1473-6

Cited by 21 publications

(29 citation statements)

References 88 publications

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“…The sex and ontogenetic stage of each individual was determined according to the development of secondary sexual characteristics (Bury & Whelan, ). Only adults were considered because juveniles rarely feed on amphibians (Bissattini & Vignoli, ; Bury & Whelan, ).…”

Section: Methodsmentioning

confidence: 99%

“…Thus, to verify the feeding strategy pattern emerging from the fieldwork, a systematic worldwide literature review on the American bullfrog diet was performed. The selection of papers for the re‐analysis followed the procedure described by Bissattini and Vignoli (): google scholar was searched for scientific peer‐reviewed papers on the American bullfrog feeding niche by selecting the following keywords: ‘American bullfrog/ Rana catesbeiana / Lithobates catesbeianus ’, ‘diet’, ‘trophic niche’, and ‘feeding ecology’. Studies were checked for relevance using the following two eligibility criteria: reporting raw data on each prey type in the form of a table or a graph (Vignoli et al, ; Vignoli & Luiselli, ) and examining American bullfrogs collected in the field (no captive experiments included).…”

Section: Methodsmentioning

confidence: 99%

“…This study investigated whether there is a mediated effect of introduced crayfish on the predation impact of the American bullfrog on native amphibians. Indeed, both field studies (Hirai, ; Wu, Li, Wang, & Adams, ) and recent worldwide literature reviews (Bissattini & Vignoli, ; Liu et al, ) have demonstrated the importance of crayfish in the diet of L. catesbeianus . Specifically, the aim of the present study was to appraise how the predation impact of the American bullfrog on native amphibians in native and non‐native conditions is influenced by the presence of introduced crayfish occurring syntopically with this frog.…”

Section: Introductionmentioning

confidence: 99%

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Field data and worldwide literature review reveal that alien crayfish mitigate the predation impact of the American bullfrog on native amphibians

Bissattini

Buono

Vignoli

2018

Aquatic Conservation

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Biological invasion studies have focused mostly on the competition and predation impact of invaders on native species; however, introduced species frequently interact with each other and, contrary to the ‘invasional meltdown theory’, such interactions may have non‐interactive effects on native fauna. Here, the effects of the interaction between American bullfrogs (Lithobates catesbeianus) and decapod crayfish on native amphibians have been investigated. Introduced American bullfrog populations were studied at two sites in central Italy (Rome, Latium), with their selection based on the presence or absence of the alien Procambarus clarkii. The pattern emerging from the fieldwork was then verified by a worldwide literature review on the trophic niche of the American bullfrog. Both field surveys and global diet analysis showed that the abundance of native amphibians in the American bullfrog diet was reduced when introduced crayfish occurred in both native and non‐native ranges. Thus, an alternative invasion model can be proposed in which the occurrence of one invader (P. clarkii) may reduce the negative effect of an alien predator (L. catesbeianus) on native species. The present findings suggest that the removal of invaders may not always be the best solution for protecting native prey, especially when alien species are interspersed with other introduced species. In such cases, multispecies operations, sequenced appropriately or undertaken simultaneously, would be preferable. Moreover, the identification of mechanisms facilitating the coexistence of native species with invaders can offer important management options.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Field data and worldwide literature review reveal that alien crayfish mitigate the predation impact of the American bullfrog on native amphibians

Bissattini

Buono

Vignoli

2018

Aquatic Conservation

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“…A primary producer was chosen rather than a primary consumer (e.g., molluscs) due to the lower variability of stable isotope values in plants (Bissattini, & Vignoli, 2017 ;McClelland, Valiela, & Michener, 1997) δ 15 N and δ 15 C ranges (NR and CR) as well as the mean distance to the centroid (CD) are measurements of the extent of the δ 15 N/ δ 15 C bi-plot, reflecting the community niche width. While Layman's metrics are usually employed in community-wide analyses, they can be used to compare species present within one ecosystem without consideration of the entire species community (Bissattini, & Vignoli, 2017;Jackson et al, 2011;Layman, 2007). While Layman's metrics are usually employed in community-wide analyses, they can be used to compare species present within one ecosystem without consideration of the entire species community (Bissattini, & Vignoli, 2017;Jackson et al, 2011;Layman, 2007).…”

Section: Stable Isotope Analysesmentioning

confidence: 99%

When alien catfish meet—Resource overlap between the North American Ictalurus punctatus and immature European Silurus glanis in the Arno River (Italy)

Haubrock

Azzini

Balzani

et al. 2019

Ecology of Freshwater Fish

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Due to the increasing globalisation and ongoing introduction of alien species specifically regarding European freshwater ecosystems, native and already present alien species will be confronted with competitors with unknown outcomes. One such case is the situation of the European catfish Silurus glanis introduced in the Arno River (Central Italy), a species sought after by anglers, which is facing competition from the later introduced alien North American channel catfish Ictalurus punctatus. Large catfish species are highly valued among anglers, but their interspecific interactions and potential ecosystem-level impacts are still poorly known. We used stomach contents and stable isotope analyses to study niche partitioning between these two alien catfish species, coexisting in the Arno River. The results suggest partial niche segregation, with immature S. glanis showing a narrower dietary and isotopic niche and a slightly higher trophic position than I. punctatus. Monitoring the catfish population sizes, trophic niches and effects on lower trophic levels are essential for future management and mitigation of their potential impacts on invaded freshwater ecosystems. K E Y W O R D Salien species, dietary analysis, interactions, isotope analyses, niche overlap, niche partitioning

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“…Kyoto; Hirai ; California, Hothem, Meckstroth, Wegner, Jennings, & Crayon, ; Zhoushan; Wu, Li, Wang, & Adams, ). A recent analysis found a narrower trophic niche for bullfrogs in invaded ranges due to their massive predation on the introduced crayfish P. clarkii (Bissattini & Vignoli, ), which may mitigate (i.e. have an antagonistic effect on) bullfrog predation on native anurans (Figure c).…”

Section: Introductionmentioning

confidence: 98%

More invaders do not result in heavier impacts: The effects of non‐native bullfrogs on native anurans are mitigated by high densities of non‐native crayfish

Liu

Wang

Zhao

et al. 2018

Journal of Animal Ecology

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With accelerating species introductions in an era of globalization, co-occurring alien species have become increasingly common. Understanding the combined ecological impacts of multiple invaders is not only crucial for wildlife managers attempting to ameliorate biodiversity loss, but also provides key insights into invasion success and species coexistence mechanisms in natural ecosystems. Compared with much attentions given to single-invader impacts, little is known about the impacts of multiple co-occurring invaders. The American bullfrog (Lithobates catesbeianus = Rana catesbeiana) and the red swamp crayfish (Procambarus clarkii) are two aquatic invasive species in many different areas of the globe. They coexist with native anurans in a variety of permanent lentic waters, which provide an ideal model system to explore the combined effects of multiple invaders from different trophic levels on native species. Based on a global diet analysis covering 34 native and invasive bullfrog populations, and data from 10-year field surveys across 157 water bodies in the Zhoushan Archipelago, China, we observed a reduced impact of bullfrogs on native anurans at high crayfish densities when the two invaders co-occurred. The global diet analysis showed that crayfish occurrence reduced the number of native anuran prey consumed by bullfrogs in both native and invasive populations. After accounting for pseudoreplication of different observations among water bodies, islands, and survey time, model averaging analyses based on GLMMs showed a negative relationship between bullfrog density and native anuran densities for field observations of invasive bullfrogs alone and co-invaded observations with low crayfish density. However, this negative relationship disappeared when the two invaders co-occurred with high crayfish density. Structural equation modelling (SEM) analyses further validated that the impacts of bullfrogs on native frogs were mitigated by the negative interactions between crayfish and bullfrogs. Our results provide novel evidence of a density-dependent antagonistic effect of two sympatric invaders from different trophic levels on native species. This study highlights the importance of considering complex interactions among co-invaders and native species when prioritizing conservation and management actions and will facilitate the development of a more precise framework to predict invasion impacts.

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Let’s eat out, there’s crayfish for dinner: American bullfrog niche shifts inside and outside native ranges and the effect of introduced crayfish

Cited by 21 publications

References 88 publications

Field data and worldwide literature review reveal that alien crayfish mitigate the predation impact of the American bullfrog on native amphibians

Field data and worldwide literature review reveal that alien crayfish mitigate the predation impact of the American bullfrog on native amphibians

When alien catfish meet—Resource overlap between the North American Ictalurus punctatus and immature European Silurus glanis in the Arno River (Italy)

More invaders do not result in heavier impacts: The effects of non‐native bullfrogs on native anurans are mitigated by high densities of non‐native crayfish

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