Aquatic food webs of the oxbow lakes in the Pantanal: A new site for fisheries guaranteed by alternated control?

Flood pulse and biotic interrelationships control the food web dynamics of river floodplain systems. The Pantanal Plain in the Paraguay River Basin (Brazil) occupies 140,000 km2 of periodically flooded areas and is divided into 12 subregions with different characteristics related to the flood pulse...

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Principais autores: Angelini, Ronaldo, Morais, Ronny José de, Catella, Agostinho Carlos, Resende, Emiko Kawakami, Libralato, Simone
Formato: article
Idioma:English
Publicado em: Elsevier
Assuntos:
Food web control
Flood pulse, Top predator
Keystone species
L index
Kempton index
Endereço do item:https://repositorio.ufrn.br/handle/123456789/30743
https://doi.org/10.1016/j.ecolmodel.2013.01.001
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spelling ri-123456789-307432023-02-02T21:26:08Z Aquatic food webs of the oxbow lakes in the Pantanal: A new site for fisheries guaranteed by alternated control? Angelini, Ronaldo Morais, Ronny José de Catella, Agostinho Carlos Resende, Emiko Kawakami Libralato, Simone Food web control Flood pulse, Top predator Keystone species L index Kempton index Flood pulse and biotic interrelationships control the food web dynamics of river floodplain systems. The Pantanal Plain in the Paraguay River Basin (Brazil) occupies 140,000 km2 of periodically flooded areas and is divided into 12 subregions with different characteristics related to the flood pulse duration, the vegetation, the type of soil, and the resources used in activities, particularly fishing. In this study, we used Ecopath with Ecosim (EwE) to model three oxbow lakes in the South Pantanal Plain, where there is no fishing activity, to test the similarity of the ecosystems, to identify the keystone species and the types of food web controls, and to determine whether these environments can support moderated fishing pressure. We found that the food webs of the oxbow lakes are similar to each other because, although they depend mainly on the presence or absence of predators, flood pulses similarly homogenize the lakes. The results highlight the importance of detritus in these food webs. In addition, the highest values of the keystoneness species index in the three models highlight the role of top predators (Hoplias malabaricus, Serrasalmus spp., Pseudoplatystoma reticulatum, birds, and mammals). Therefore, we suggest that the food webs in the three systems are subjected to an alternated control process: detritus controls the food web during the flood season and by the top predators during the dry season. The simulation outputs indicate that these oxbow lakes can sustain only moderate fishing because increasing the fishing pressure reduces the biodiversity and can negatively impact the top predators 2020-11-27T14:20:23Z 2020-11-27T14:20:23Z 2013-03-24 article ANGELINI, Ronaldo; MORAIS, Ronny José de; CATELLA, Agostinho Carlos; RESENDE, Emiko Kawakami; LIBRALATO, Simone. Aquatic food webs of the oxbow lakes in the Pantanal: a new site for fisheries guaranteed by alternated control?. Ecological Modelling, [S.L.], v. 253, p. 82-96, mar. 2013. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S030438001300015X. Acesso em: 17 nov. 2020. https://doi.org/10.1016/j.ecolmodel.2013.01.001 0304-3800 https://repositorio.ufrn.br/handle/123456789/30743 https://doi.org/10.1016/j.ecolmodel.2013.01.001 en Elsevier
institution Repositório Institucional
collection RI - UFRN
language English
topic Food web control
Flood pulse, Top predator
Keystone species
L index
Kempton index
spellingShingle Food web control
Flood pulse, Top predator
Keystone species
L index
Kempton index
Angelini, Ronaldo
Morais, Ronny José de
Catella, Agostinho Carlos
Resende, Emiko Kawakami
Libralato, Simone
Aquatic food webs of the oxbow lakes in the Pantanal: A new site for fisheries guaranteed by alternated control?
description Flood pulse and biotic interrelationships control the food web dynamics of river floodplain systems. The Pantanal Plain in the Paraguay River Basin (Brazil) occupies 140,000 km2 of periodically flooded areas and is divided into 12 subregions with different characteristics related to the flood pulse duration, the vegetation, the type of soil, and the resources used in activities, particularly fishing. In this study, we used Ecopath with Ecosim (EwE) to model three oxbow lakes in the South Pantanal Plain, where there is no fishing activity, to test the similarity of the ecosystems, to identify the keystone species and the types of food web controls, and to determine whether these environments can support moderated fishing pressure. We found that the food webs of the oxbow lakes are similar to each other because, although they depend mainly on the presence or absence of predators, flood pulses similarly homogenize the lakes. The results highlight the importance of detritus in these food webs. In addition, the highest values of the keystoneness species index in the three models highlight the role of top predators (Hoplias malabaricus, Serrasalmus spp., Pseudoplatystoma reticulatum, birds, and mammals). Therefore, we suggest that the food webs in the three systems are subjected to an alternated control process: detritus controls the food web during the flood season and by the top predators during the dry season. The simulation outputs indicate that these oxbow lakes can sustain only moderate fishing because increasing the fishing pressure reduces the biodiversity and can negatively impact the top predators
format article
author Angelini, Ronaldo
Morais, Ronny José de
Catella, Agostinho Carlos
Resende, Emiko Kawakami
Libralato, Simone
author_facet Angelini, Ronaldo
Morais, Ronny José de
Catella, Agostinho Carlos
Resende, Emiko Kawakami
Libralato, Simone
author_sort Angelini, Ronaldo
title Aquatic food webs of the oxbow lakes in the Pantanal: A new site for fisheries guaranteed by alternated control?
title_short Aquatic food webs of the oxbow lakes in the Pantanal: A new site for fisheries guaranteed by alternated control?
title_full Aquatic food webs of the oxbow lakes in the Pantanal: A new site for fisheries guaranteed by alternated control?
title_fullStr Aquatic food webs of the oxbow lakes in the Pantanal: A new site for fisheries guaranteed by alternated control?
title_full_unstemmed Aquatic food webs of the oxbow lakes in the Pantanal: A new site for fisheries guaranteed by alternated control?
title_sort aquatic food webs of the oxbow lakes in the pantanal: a new site for fisheries guaranteed by alternated control?
publisher Elsevier
publishDate 2020
url https://repositorio.ufrn.br/handle/123456789/30743
https://doi.org/10.1016/j.ecolmodel.2013.01.001
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