Bancos de macrófitas aquáticas em lago de várzea: Alimentação de duas espécies de peixes na região de Manaus, Amazonas, Brasil

Magalhães, Esner Robert Santos; Yamamoto, Kedma Cristine; Anjos, Hélio Daniel Beltrão dos; Loebens, Sara de Castro; Soares, Maria de Lourdes

doi:10.2312/actafish.2015.3.1.25-40

Cited by 3 publications

(1 citation statement)

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“…These changes generate a mosaic of habitats in the floodplain (i.e., channels, marginal lakes, extensive aquatic macrophytes stands) that favor success in the life cycle of many regional species (Zacardi et al, 2017b;Oliveira et al, 2020). It should be noted that the floodplain in the Amazon River is locally called "várzea" which represents regions of the fluvial plain flooded by white water rivers rich in sediments, coming from the Andes, which fertilize the soil favoring the growth and establishment of extensive areas of aquatic vegetation (Piedade et al, 2020), colonized by an association of invertebrates (entomofauna) and periphyton in the root system serving as food sources for many aquatic biota organisms (Sánchez-Botero et al, 2007;Magalhães et al, 2015).…”

Section: Study Areamentioning

confidence: 99%

Effects of anomalous climatic events on the structure of fish larvae assemblages in the eastern Amazon

Cajado

Oliveira

Silva

et al. 2022

Front. Environ. Sci.

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The reproduction of neotropical fish is linked to environmental stimuli that act as triggers in this process. Thus, it is possible to affirm that specific environmental changes can delimit most fish’s period and reproductive success. El Niño Southern Oscillation phenomena (ENSO) influence rainfall and, consequently, hydrological dynamics, affecting several fish population aspects, especially reproductive aspects. However, in the Amazon, empirical evidence of the effect of anomalous climatic events on fish reproduction is incipient. In this sense, we investigated the taxonomic and functional structure of parental fish larvae stocks and how species modulate their reproductive activities before (2013 and 2014) and during La Niña (2018) and El Niño (2019) events. The data evidence that the larval assemblages suffered alterations in the taxonomic and functional composition between the three analyzed periods and a pattern of temporal distribution with a high influence of environmental variables. Flow, pH, and electrical conductivity were the most important variables to modulate fish reproductive intensity between periods. The species seem to respond to combinations of these variables that reflect environmental conditions conducive to biological recruitment according to their ecological characteristics, allowing the perpetuation or decline of their abundance in each period. All species of commercial interest associated with the neutral period showed a sharp decline in the subsequent moments. These results suggest that the incidence of anomalous climatic events added to regional fisheries exploitation can negatively affect the phenology and demographic patterns of larvae assemblages on a short temporal scale. During the neutral period, the community was dominated by larvae of periodic large, herbivores, piscivores, epibenthic maneuverable, and nektonic burst swimmers. The decrease in the abundance of certain functional groups at the neutral and La Niña period favored an accelerated ecological succession during the El Niño period, due to the increase of species from basal trophic levels (planktivores), generalists (omnivores), highly resilient (intermediate strategists), sedentary, short-distance migrants and little commercially exploited. Thus, the results contribute to the understanding of the interactions between anomalous climatic events and the reproduction of fish with different ecological characteristics in the Amazon River.

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Section: Study Areamentioning

confidence: 99%

Effects of anomalous climatic events on the structure of fish larvae assemblages in the eastern Amazon

Cajado

Oliveira

Silva

et al. 2022

Front. Environ. Sci.

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The retention of plastic particles by macrophytes in the Amazon River, Brazil

Guimarães,

Pereira,

de Moraes

et al. 2024

Environ Sci Pollut Res

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Caracterização da dieta de Melanosuchus niger (Spix, 1825) e Caiman crocodilus (Linnaeus, 1758) na Resex Lago do Cuniã, Rondônia

Costa

Nunes

2019

Rev Colombiana Cienc Anim. RECIA

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O objetivo deste estudo foi caracterizar a dieta de indivíduos machos de Melanosuchus niger e Caiman crocodilus em um lago da Reserva Extrativista do Lago do Cuniã, Rondônia. Foram coletados intestinos dos animais em novembro/2016, estação chuvosa, fornecidos pela Cooperativa local (COOPCuniã). As cavidades abdominais dos jacarés foram abertas e seu estômago foi retirado e armazenado em álcool a 70%, e os alimentos foram analisados. Foram analisados 82 estômagos, 42 de M. niger e 40 de C. crocodilus. Alimentos como fragmentos de aves, anfíbios, crustáceos, insetos e material vegetal foram ingeridos pelas espécies estudadas. No entanto, os itens mais representativos na dieta de M. niger e C. crocodilus foram peixes da ordem Characifomes e Siluriformes sem importância comercial.

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Bancos de macrófitas aquáticas em lago de várzea: Alimentação de duas espécies de peixes na região de Manaus, Amazonas, Brasil

Cited by 3 publications

References 0 publications

Effects of anomalous climatic events on the structure of fish larvae assemblages in the eastern Amazon

Effects of anomalous climatic events on the structure of fish larvae assemblages in the eastern Amazon

The retention of plastic particles by macrophytes in the Amazon River, Brazil

Caracterização da dieta de Melanosuchus niger (Spix, 1825) e Caiman crocodilus (Linnaeus, 1758) na Resex Lago do Cuniã, Rondônia

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