Diet of the electric knife-fishes, Gymnotus omarorum, is described in Laguna Blanca Río Pilcomayo National Park, Formosa province, Argentine

Ferriz, Ricardo A.; Iwaszkiw, Juan M.

doi:10.22179/revmacn.16.395

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MACN

2014

DOI: 10.22179/revmacn.16.395

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Diet of the electric knife-fishes, Gymnotus omarorum, is described in Laguna Blanca Río Pilcomayo National Park, Formosa province, Argentine

Ricardo A. Ferriz

Juan M. Iwaszkiw

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Cited by 3 publications

References 16 publications

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Macroinvertebrates of Eichhornia crassipes (Pontederiaceae) roots in the alluvial floodplain of large tropical rivers (Argentina)

Poi

Neiff

Casco

et al. 2020

RBT

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Introduction: Eichhornia crassipes is a dominant aquatic plant of neotropical-river floodplains and is invasive in warm waters of different continents. Plants provide food and habitat for fish, especially Prochilodus lineatus and Gymnotus omarorum, which are relevant to subsistence fishing by local indigenous communities. Objective: In this study we describe the main traits of E. crassipes floating meadows, and analyze the abundance and composition of macroinvertebrate assemblages associated with their roots in two floodplain wetlands of the Paraná River (within the Ramsar site Wetlands Chaco) and of the Pilcomayo River (within the Pilcomayo River National Park). Methods: During spring and summer, the macroinvertebrates were collected in monospecific stands of E. crassipes with a net of 962 cm2 area and 500 µm mesh size. Leaf density, the biomass of leaves and roots, the length of leaves and roots, and the water quality were measured simultaneously. Results: Temperature, oxygen concentration, and nutrient content were significantly higher and electrical conductivity was lower in the Pilcomayo than in the Paraná floodplain. E. crassipes growing in the Pilcomayo floodplain had longer leaves and less root biomass than those found in the Paraná floodplain. The number of macroinvertebrates per 1 000 g root dry weight and per m2 was significantly different between both floodplains, but the taxon richness was similar. Non Metric Multidimensional Scaling analysis differentiated the abundance of 14 selected taxa between both floodplains, and showed a high correlation between the environmental variables and macroinvertebrate abundance. The most abundant taxonomic groups in the Paraná River floodplain were oligochaetes (Naididae), ostracods mainly Cytheridella ilosvayi and larvae of non-biting midges (Chironomidae). Two families, Hydrobiidae (Heleobia parchappii) and Chironomidae accounted for 49.3 % of the total abundance in the Pilcomayo floodplain. The prawns Macrobrachium jelskii and M. amazonicum, frequent in the Pilcomayo floodplain, were not found in the Paraná floodplain. Conclusions: The different environmental conditions in both floodplains affect the abundance, composition, and the dominance of macroinvertebrate assemblages; however, the total taxa richness was similar. The area occupied by E. crassipes in the floodplains of these rivers provides the habitat that contributes most to overall biotic diversity, which must be considered in management strategies.

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Macroinvertebrates of Eichhornia crassipes (Pontederiaceae) roots in the alluvial floodplain of large tropical rivers (Argentina)

Poi

Neiff

Casco

et al. 2020

RBT

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Hábitos tróficos del lenguado Citharicthys gilberti (Paralichthyidae) y su relación con las dinámica ambiental en la Bahía de Buenaventura, Pacífico colombiano

García¹,

Sandoval²,

Duque³

2021

Bol. Investig. Mar. Costeras

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Los lenguados son importantes en el flujo de energía de los estuarios, el cual está influenciado por la dinámica de las variables ecológicas y ambientales de estos ecosistemas. Esta investigación proporciona una evaluación de la influencia que tienen las variaciones ambientales (espaciotemporales) en la dieta de Citharicthys gilberti en la Bahía de Buenaventura. Se examinaron un total de 92 estómagos correspondientes a sitios con diferentes características ambientales dentro de la Bahía. Se determinaron índices de alimentación para hacer una caracterización trófica y evaluar las interacciones entre los hábitos tróficos y las variables ambientales. Los resultados muestran que esta especie es en gran medida un depredador oportunista. Las presas que representaron la mayor importancia relativa dentro de la dieta de C. gilberti fueron los crustáceos y los peces. El consumo de crustáceos fue mayor en la época seca y en la zona externa, siendo influenciado significativamente por variaciones en el pH y la transparencia. Por otra parte, el consumo de peces fue constante todo el año independientemente de las variaciones ambientales. Así mismo, los nematodos y los poliquetos fueron presas secundarias y los huevos y moluscos presas secundarias o accidentales y no presentaron diferencias espaciotemporales. Los peces bentónicos son de vital importancia en el ecosistema estuarino, ya que proporcionan un intercambio energético entre el hábitat demersal y la columna de agua, reflejando no solo los efectos de las variaciones ambientales, sino también, la dinámica de las especies relacionadas tróficamente.

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Análise do uso de microhabitat, distribuição espacial e dieta de Gymnorhamphichthys rondoni (Miranda-Ribeiro, 1920) (Rhamphichthyidae) em riachos de baixa ordem, Amazônia Ocidental

et al. 2019

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O hábito alimentar, psamófilo, e a morfologia de Gymnorhamphichthys rondoni, o tornam uma espécie altamente especializada, com importante papel em sistemas de riachos. Nesse sentido, o objetivo do presente estudo foi analisar o uso de microhabitats, composição da dieta, estratégias alimentares, amplitude de nicho e distribuição espacial da espécie de G. rondoni, em riachos de cabeceiras. Em cada um dos três riachos selecionados (P1, P2 e P3), localizados na Fazenda Experimental Catuaba, Acre, foram amostrados três pontos compostos por substrato de areia, três compostos por substrato de matéria orgânica e três compostos por argila, durante os períodos de seca, vazante e cheia. Os resultados mostraram que a população de G. rondoni aumentou ao longo do gradiente longitudinal, principalmente, durante o período de seca (376 indivíduos), no qual os indivíduos ocuparam substratos compostos por areia e apresentaram dieta baseada, principalmente, por presas bentônicas, como larvas de Diptera e Coleoptera. Assim, a preferência pelo consumo de larvas autóctone por G. rondoni e a sua morfologia especializada podem estar associadas à sua relação com os microhabitats de areia. O que se sugere é que a perda desses microhabitats pode influenciar negativamente a população de G. rondoni.

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Diet of the electric knife-fishes, Gymnotus omarorum, is described in Laguna Blanca Río Pilcomayo National Park, Formosa province, Argentine

Cited by 3 publications

References 16 publications

Macroinvertebrates of Eichhornia crassipes (Pontederiaceae) roots in the alluvial floodplain of large tropical rivers (Argentina)

Macroinvertebrates of Eichhornia crassipes (Pontederiaceae) roots in the alluvial floodplain of large tropical rivers (Argentina)

Hábitos tróficos del lenguado Citharicthys gilberti (Paralichthyidae) y su relación con las dinámica ambiental en la Bahía de Buenaventura, Pacífico colombiano

Análise do uso de microhabitat, distribuição espacial e dieta de Gymnorhamphichthys rondoni (Miranda-Ribeiro, 1920) (Rhamphichthyidae) em riachos de baixa ordem, Amazônia Ocidental

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