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1.
Pap. avulsos zool ; 61: e20216103, 2021. ilus
Artigo em Inglês | VETINDEX | ID: biblio-1487402

Resumo

During focal observations carried out in the Olho d’Água River, upper Paraguay River basin, Brazil, we registered the defensive behaviour of one pair of Crenicichla lepidota attempting to protect their offspring from conspecific and non-specific predators. Adults exhibited substrate-guarding behaviour and displayed primary and secondary anti-predation mechanisms. The primary mechanisms (e.g., fin flicking and flaring, gill extending) were ineffective against conspecific predators or against other species. Secondary mechanisms included charging would-be predators of the offspring, and this tactic was successful against non-specifics. This record confirms, in the wild, agonistic behaviour as an effective secondary defence mechanism used in parental care in Crenicichla lepidota.


Assuntos
Animais , Ciclídeos/crescimento & desenvolvimento , Estágios do Ciclo de Vida
2.
Artigo em Inglês | LILACS-Express | VETINDEX | ID: biblio-1487417

Resumo

Abstract During focal observations carried out in the Olho dÁgua River, upper Paraguay River basin, Brazil, we registered the defensive behaviour of one pair of Crenicichla lepidota attempting to protect their offspring from conspecific and non-specific predators. Adults exhibited substrate-guarding behaviour and displayed primary and secondary anti-predation mechanisms. The primary mechanisms (e.g., fin flicking and flaring, gill extending) were ineffective against conspecific predators or against other species. Secondary mechanisms included charging would-be predators of the offspring, and this tactic was successful against non-specifics. This record confirms, in the wild, agonistic behaviour as an effective secondary defence mechanism used in parental care in Crenicichla lepidota.

3.
Pap. avulsos Zool. ; 61: e20216103, 2021. ilus
Artigo em Inglês | VETINDEX | ID: vti-765670

Resumo

During focal observations carried out in the Olho dÁgua River, upper Paraguay River basin, Brazil, we registered the defensive behaviour of one pair of Crenicichla lepidota attempting to protect their offspring from conspecific and non-specific predators. Adults exhibited substrate-guarding behaviour and displayed primary and secondary anti-predation mechanisms. The primary mechanisms (e.g., fin flicking and flaring, gill extending) were ineffective against conspecific predators or against other species. Secondary mechanisms included charging would-be predators of the offspring, and this tactic was successful against non-specifics. This record confirms, in the wild, agonistic behaviour as an effective secondary defence mechanism used in parental care in Crenicichla lepidota.(AU)


Assuntos
Animais , Estágios do Ciclo de Vida , Ciclídeos/crescimento & desenvolvimento
4.
Acta Sci. Biol. Sci. ; 39(4): 441-447, Oct.-Dec.2017. mapas, tab, graf
Artigo em Inglês | VETINDEX | ID: vti-18163

Resumo

The aim of this study was to investigate the diet composition and feeding strategies of Triportheus nematurus at the Miranda-Abobral floodplain region and evaluate if the temporal phenomenon of the flood pulse has influenced in the diet composition of the species. The fishes were sampled quarterly between August/2014 and July/2016 in the marginal ponds located in the Estrada Parque (MS 184). The feeding habits of T. nematurus was characterized as omnivorous and its opportunistic feeding behaviour, since its diet is composed of different resources along of the year. Insects and organic matter were the most important items during the drought period; plant material (leaves and roots) and Euglenophyceae algae were more expressive during the inundation period; insects and fruits were also abundant during the flood period. Through statistical analysis, it was possible to verify significant variation in the diet composition of the species. This variation in the components of the diet may be related to the availability of resources in the ponds throughout the year and reflect an already known pattern in Neotropical fish populations, which present high alimentary plasticity.(AU)


O objetivo deste estudo foi investigar a composição da dieta e as estratégias alimentares deTriportheus nematurus na planície de inundação da região do Miranda-Abobral e avaliar se o fenômenotemporal do pulso de inundação tem influência na composição da dieta da espécie ao longo do ano. Ospeixes foram amostrados trimestralmente entre agosto/2014 e julho/2016, nas lagoas marginais situadas na EstradaParque (MS 184). O hábito alimentar de T. nematurus foi caracterizado como onívoro e seu comportamentoalimentar oportunista, pois sua dieta é composta de diferentes recursos ao longo do ano. Insetos e matériaorgânica foram os itens mais importantes no período de seca, matéria vegetal (folhas e raízes) e algasEuglenophyceae foram mais expressivos durante a enchente e insetos e frutos tiveram maior participação na dietadurante o período de cheia. Por meio das análises estatísticas foi possível verificar a variação temporal significativana composição da dieta da espécie em pelo menos dois períodos. Essas alterações alimentares podem estarrelacionadas à disponibilidade dos recursos nas lagoas ao longo do ano e refletem um padrão já conhecido empopulações de peixes neotropicais, que apresentam alta plasticidade alimentar.(AU)


Assuntos
Animais , Caraciformes/crescimento & desenvolvimento , Caraciformes/metabolismo , Ração Animal/análise , Alimentos, Dieta e Nutrição , Áreas Alagadas
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