Invasive bullfrogs as predators in a Neotropical assemblage: What frog species do they eat?
Anurans are important prey for the American bullfrog Lithobates catesbeianus, but field assessments of its diet in the context of a local prey assemblage are lacking. We aimed to identify the frog species consumed by an invasive bullfrog population in subtropical South America, and to assess their r...
| Autor principal: | Boelter, Ruben Alexandre |
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| Outros Autores: | Kaefer, Igor L., Both, Camila, Cechin, Sônia Zanini |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Animal Biology
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/17959 |
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oai:repositorio:1-17959 |
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oai:repositorio:1-17959 Invasive bullfrogs as predators in a Neotropical assemblage: What frog species do they eat? Boelter, Ruben Alexandre Kaefer, Igor L. Both, Camila Cechin, Sônia Zanini Biological Invasion Cannibalism Diet Frog Invasive Species Native Species Neotropic Ecozone Predation Predator Relative Abundance Stomach Content Subtropical Region South America Anurans are important prey for the American bullfrog Lithobates catesbeianus, but field assessments of its diet in the context of a local prey assemblage are lacking. We aimed to identify the frog species consumed by an invasive bullfrog population in subtropical South America, and to assess their relative importance among other types of prey. Characterization of the frog assemblage in the study area also allowed us to calculate the degree of electivity of the recorded anuran prey, in order to gain insight regarding bullfrog feeding preferences and to test if the bullfrog prey composition differed from a random sample of the assemblage. A total of 32.6% of the bullfrogs had at least one anuran in the stomach contents, and post-metamorphic anurans represented 49.1% of the relative prey importance for adult bullfrogs. Anurans were preyed on by all size classes, and constituted the volumetrically most important prey category in the diet of individuals heavier than 100 g. Cycloramphidae, Hylidae and Leiuperidae were positively selected, and Hypsiboas pulchellus and Physalaemus cuvieri were the species most often taken. We found a low occurrence of cannibalism, despite the high density of bullfrogs at the study site. Our results showed that the degree of electivity differed among bullfrog prey types, suggesting that some frog species may be preyed on in a higher proportion than their relative abundance in the assemblage. Testing the clues provided by this assemblage-level approach may lead to a better assessment of the interactions between bullfrogs and the native frog fauna. © 2012 Koninklijke Brill NV, Leiden. 2020-06-15T21:50:28Z 2020-06-15T21:50:28Z 2012 Artigo https://repositorio.inpa.gov.br/handle/1/17959 10.1163/157075612X634111 en Volume 62, Número 4, Pags. 397-408 Restrito Animal Biology |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Biological Invasion Cannibalism Diet Frog Invasive Species Native Species Neotropic Ecozone Predation Predator Relative Abundance Stomach Content Subtropical Region South America |
| spellingShingle |
Biological Invasion Cannibalism Diet Frog Invasive Species Native Species Neotropic Ecozone Predation Predator Relative Abundance Stomach Content Subtropical Region South America Boelter, Ruben Alexandre Invasive bullfrogs as predators in a Neotropical assemblage: What frog species do they eat? |
| topic_facet |
Biological Invasion Cannibalism Diet Frog Invasive Species Native Species Neotropic Ecozone Predation Predator Relative Abundance Stomach Content Subtropical Region South America |
| description |
Anurans are important prey for the American bullfrog Lithobates catesbeianus, but field assessments of its diet in the context of a local prey assemblage are lacking. We aimed to identify the frog species consumed by an invasive bullfrog population in subtropical South America, and to assess their relative importance among other types of prey. Characterization of the frog assemblage in the study area also allowed us to calculate the degree of electivity of the recorded anuran prey, in order to gain insight regarding bullfrog feeding preferences and to test if the bullfrog prey composition differed from a random sample of the assemblage. A total of 32.6% of the bullfrogs had at least one anuran in the stomach contents, and post-metamorphic anurans represented 49.1% of the relative prey importance for adult bullfrogs. Anurans were preyed on by all size classes, and constituted the volumetrically most important prey category in the diet of individuals heavier than 100 g. Cycloramphidae, Hylidae and Leiuperidae were positively selected, and Hypsiboas pulchellus and Physalaemus cuvieri were the species most often taken. We found a low occurrence of cannibalism, despite the high density of bullfrogs at the study site. Our results showed that the degree of electivity differed among bullfrog prey types, suggesting that some frog species may be preyed on in a higher proportion than their relative abundance in the assemblage. Testing the clues provided by this assemblage-level approach may lead to a better assessment of the interactions between bullfrogs and the native frog fauna. © 2012 Koninklijke Brill NV, Leiden. |
| format |
Artigo |
| author |
Boelter, Ruben Alexandre |
| author2 |
Kaefer, Igor L. Both, Camila Cechin, Sônia Zanini |
| author2Str |
Kaefer, Igor L. Both, Camila Cechin, Sônia Zanini |
| title |
Invasive bullfrogs as predators in a Neotropical assemblage: What frog species do they eat? |
| title_short |
Invasive bullfrogs as predators in a Neotropical assemblage: What frog species do they eat? |
| title_full |
Invasive bullfrogs as predators in a Neotropical assemblage: What frog species do they eat? |
| title_fullStr |
Invasive bullfrogs as predators in a Neotropical assemblage: What frog species do they eat? |
| title_full_unstemmed |
Invasive bullfrogs as predators in a Neotropical assemblage: What frog species do they eat? |
| title_sort |
invasive bullfrogs as predators in a neotropical assemblage: what frog species do they eat? |
| publisher |
Animal Biology |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/17959 |
| _version_ |
1787142962886475776 |
| score |
11.653393 |