Preferência alimentar de juvenis de lambari-cachorro, Oligosarcus hepsetus, em relação a duas espécies de presas de peixe em ambiente controlado

Santos, Luciano Neves dos; Carrera, Pedro Ribeiro de Oliveira; Aronovich, Marcos

doi:10.1590/s0103-84782014000200018

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…The fish species Rhamdia quelen, Crenicichla lacustris, and Trachelyopterus striatulus, whose feeding consists of insects, crustaceans, mollusks, and small-sized fish (Dias et al, 2005;Santos et al, 2009), had a high abundance among demersal carnivorous fish. The species Oligosarcus hepsetus, the most abundant among the pelagic carnivorous fish, feeds on small-sized fish belonging to lower trophic positions (Araújo et al, 2005;Botelho et al, 2007;Santos et al, 2014). Furthermore, the low numeric representation of piscivorous fish belonging to the top of the food chain (Hoplias malabaricus, Salminus brasiliensis, and Cichla ocellaris -Suarez et al, 2001;Bozza & Hahn, 2010) in the sampling of this study likely contributed to the lower trophic positions of this guild in comparison to the remaining guilds (Table 1).…”

Section: Resultsmentioning

confidence: 73%

Isotopic profile and mercury concentration in fish of the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil

et al. 2015

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The aim of this study was to evaluate the isotopic profile and mercury (Hg) concentrations in fish (carnivores, omnivores and detritivores) in the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil. Carbon (δ 13 C) isotopic analyses revealed that pelagic and benthonic sources are part of the feeding of the fish from the different guilds (-14.0 to -24.8 ‰). The benthic sources are usually enriched in δ 13 C (-16.9‰, from watershed runoff) compared to pelagic sources because the phytoplankton, important primary producer that supports several pelagic chains, has δ 13 C signature lighter (-23.9‰). The nitrogen (δ 15 N) isotopic signatures indicated that most guilds were at the same trophic position (10.0 to 15.5 ‰), except for pelagic omnivorous fish, which had a lower trophic position. Niche overlap was observed among pelagic and demersal carnivorous fish, demersal omnivorous fish, and demersal detritivorous fish. The lower isotopic niche breadth of pelagic carnivorous fish reveals the specialized resource use by this guild. Hg concentrations (ng g -1 dry weight) differed significantly between demersal carnivorous fish (185.3 dry weight; 27.8 wet weight) and demersal omnivorous fish (277.9 dry weight; 41.7 wet weight) and between pelagic omnivorous fish (197.2 dry weight; 29.6 wet weight) and demersal omnivorous fish due to (1) differences in food sources: guilds that fed on bottom resources were more affected by contamination because the sediment is an important Hg accumulator in the study area, and (2) because of its trophic positions. Considering that the fish consumed prey of similar trophic positions, the guilds did not show a well-defined food hierarchy. Therefore, in this study, there was no clear relationship between Hg and δ 15 N.O objetivo deste estudo foi avaliar o perfil isotópico e as concentrações de mercúrio (Hg) em peixes (carnívoros, onívoros e detritívoros) na bacia inferior do rio Paraíba do Sul, sudeste do Brasil. As análises isotópicas de carbono (δ 13 C) revelaram participação de fontes pelágica e bentônica na alimentação dos peixes das diferentes guildas (-14,0 a -24,8 ‰). As fontes bentônicas são usualmente mais enriquecidas em δ 13 C (-16,9‰, derivado do escoamento superficial da bacia de drenagem) comparadas às fontes pelágicas pois, o fitoplâncton, importante produtor primário que suporta inúmeras cadeias pelágicas, tem assinatura de δ 13 C mais leve (-23,9‰). As assinaturas isotópicas de nitrogênio (δ 15 N) indicaram que a maioria das guildas estava no mesmo nível trófico (10,0 a 15,5 ‰), exceto os peixes onívoros pelágicos cuja posição trófica foi inferior. Observou-se sobreposição de nicho entre peixes carnívoros pelágicos e demersais, onívoros demersais, e detritívoros demersais. A menor amplitude de nicho isotópico dos peixes carnívoros pelágicos revela o uso de recursos especializados por esta guilda. A concentração de Hg (ng g -1 peso seco) diferiu significativamente entre peixes carnívoros demersais (185,3 peso seco; 27,8 peso úmido) e onívoros demersais (277,...

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Section: Resultsmentioning

confidence: 73%

Isotopic profile and mercury concentration in fish of the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil

et al. 2015

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“…overpopulation, it negatively impacted native Cichla spp. populations, threatened other non-target species or completely destroyed the habitat (Araújo et al, 2005;Simberloff, 2008;dos Santos et al, 2014;Santos et al, 2019). Rapid actions always produce fast results because it lacks surveillance and is briefly (sometimes one-off) implemented.…”

Section: Learning From Invading Cichla Sppmentioning

confidence: 99%

A review on introduced Cichla spp. and emerging concerns

Sastraprawira

Razak

Shahimi

et al. 2020

Heliyon

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Peacock bass (Cichla spp.) originates from the Neotropical environments of Brazil and Venezuela but, through trade and smuggling for aquarium keeping, sport fishing and aquaculture, it is now an emerging concern. Yet, less is known for Cichla spp. distribution and its ability to invade new environments. Aimed to communicate on Cichla spp. ecology, biology and introduction schemes from Scopus, Web of Science, Google Scholar and also National Centre for Biotechnology Information, this review also contains management strategies for invading fish species. While Cichla spp. can displace native fish populations, this concern is explained using ecological functions, physiological demands, direct and secondary invasion, disease tolerance and parasite spillover. Briefly, Cichla spp. has rapid embryogenesis (72 h) and matures in short periods (11-12 months), giving it an advantage to colonize new environments. With a large appetite, this true piscivore gains territorial control over water bodies by making it their feeding and nursery grounds. Perceived as an emerging concern after becoming introduced, seal-off or sport fishing were used to manage Cichla spp. but, this practice is not sustainable for the entire ecosystem. Hence, we recommend bottom-up management that involves community participation because they interact with the fish and have knowledge about their environment.

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Water turbidity increases biotic resistance of native Neotropical piscivores to alien fish

2018

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Preferência alimentar de juvenis de lambari-cachorro, Oligosarcus hepsetus, em relação a duas espécies de presas de peixe em ambiente controlado

Cited by 4 publications

References 11 publications

Isotopic profile and mercury concentration in fish of the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil

Isotopic profile and mercury concentration in fish of the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil

A review on introduced Cichla spp. and emerging concerns

Water turbidity increases biotic resistance of native Neotropical piscivores to alien fish

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