Hypoxic environments as refuge against predatory fish in the Amazonian floodplains
Several groups of Amazonian fishes exhibit behavioral, morphological and physiological characteristics that allow occupying hypoxic environments, despite the energetic costs of living in such harsh conditions. One of the supposed advantages of occupying hypoxic habitats would be a lower predation pr...
| Autor principal: | Anjos, Maeda Batista dos |
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| Outros Autores: | Oliveira, Renildo Ribeiro de, Zuanon, Jansen |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Revista Brasileira de Biologia
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/14827 |
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oai:repositorio:1-14827 |
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oai:repositorio:1-14827 Hypoxic environments as refuge against predatory fish in the Amazonian floodplains Anjos, Maeda Batista dos Oliveira, Renildo Ribeiro de Zuanon, Jansen Oxygen Animals Behavior, Animals Brasil Classification Fish Physiology River Animal Behavior, Animals Brasil Fishes Oxygen Rivers Pisces Several groups of Amazonian fishes exhibit behavioral, morphological and physiological characteristics that allow occupying hypoxic environments, despite the energetic costs of living in such harsh conditions. One of the supposed advantages of occupying hypoxic habitats would be a lower predation pressure resulting from a lower number of piscivorous fishes in those environments. We tested this hypothesis in an area of the Amazon River floodplain through gill net fishing in normoxic and hypoxic habitats. From the 103 species caught, 38 were classified as piscivores. We found no difference in the number of piscivorous species captured in hypoxic and normoxic habitats (χ2 = 0.23; p = 0.63; df = 1) but piscivorous individuals were more numerous in normoxic than in hypoxic sampling stations (χ2 = 104.4; p < 0.001; df = 1). This indicates that environments submitted to low oxygen conditions may in fact function as refuges against piscivorous fishes in the Amazonian floodplains. 2020-04-24T17:09:51Z 2020-04-24T17:09:51Z 2008 Artigo https://repositorio.inpa.gov.br/handle/1/14827 10.1590/S1519-69842008000100007 en Volume 68, Número 1, Pags. 45-50 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Revista Brasileira de Biologia |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Oxygen Animals Behavior, Animals Brasil Classification Fish Physiology River Animal Behavior, Animals Brasil Fishes Oxygen Rivers Pisces |
| spellingShingle |
Oxygen Animals Behavior, Animals Brasil Classification Fish Physiology River Animal Behavior, Animals Brasil Fishes Oxygen Rivers Pisces Anjos, Maeda Batista dos Hypoxic environments as refuge against predatory fish in the Amazonian floodplains |
| topic_facet |
Oxygen Animals Behavior, Animals Brasil Classification Fish Physiology River Animal Behavior, Animals Brasil Fishes Oxygen Rivers Pisces |
| description |
Several groups of Amazonian fishes exhibit behavioral, morphological and physiological characteristics that allow occupying hypoxic environments, despite the energetic costs of living in such harsh conditions. One of the supposed advantages of occupying hypoxic habitats would be a lower predation pressure resulting from a lower number of piscivorous fishes in those environments. We tested this hypothesis in an area of the Amazon River floodplain through gill net fishing in normoxic and hypoxic habitats. From the 103 species caught, 38 were classified as piscivores. We found no difference in the number of piscivorous species captured in hypoxic and normoxic habitats (χ2 = 0.23; p = 0.63; df = 1) but piscivorous individuals were more numerous in normoxic than in hypoxic sampling stations (χ2 = 104.4; p < 0.001; df = 1). This indicates that environments submitted to low oxygen conditions may in fact function as refuges against piscivorous fishes in the Amazonian floodplains. |
| format |
Artigo |
| author |
Anjos, Maeda Batista dos |
| author2 |
Oliveira, Renildo Ribeiro de Zuanon, Jansen |
| author2Str |
Oliveira, Renildo Ribeiro de Zuanon, Jansen |
| title |
Hypoxic environments as refuge against predatory fish in the Amazonian floodplains |
| title_short |
Hypoxic environments as refuge against predatory fish in the Amazonian floodplains |
| title_full |
Hypoxic environments as refuge against predatory fish in the Amazonian floodplains |
| title_fullStr |
Hypoxic environments as refuge against predatory fish in the Amazonian floodplains |
| title_full_unstemmed |
Hypoxic environments as refuge against predatory fish in the Amazonian floodplains |
| title_sort |
hypoxic environments as refuge against predatory fish in the amazonian floodplains |
| publisher |
Revista Brasileira de Biologia |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/14827 |
| _version_ |
1787144692571308032 |
| score |
11.755432 |