Dissertação

Relações tróficas entre três espécies sintópicas de Rivulus (Cyprinodontiformes: Rivulidae) em igarapés da Reserva Ducke, Manaus, Amazonas

This study aimed to analyze the trophic relations between Rivulus micropus, R. obscurus and R. kirovskyi in temporary ponds in the Reserva Florestal Adolpho Ducke, Amazonas, Brazil. Sampling was conducted between February and June 2013. A total of 149 specimens of R. micropus, 210 of R. kirovskyi an...

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Autor principal: Fernandes, Suzanne Sousa
Grau: Dissertação
Idioma: por
Publicado em: Instituto Nacional de Pesquisas da Amazônia - INPA 2020
Assuntos:
Peixes
Poças temporárias
Rivulidae
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/11243
http://lattes.cnpq.br/8522587724940766
id oai:repositorio:1-11243
recordtype dspace
spelling oai:repositorio:1-11243 Relações tróficas entre três espécies sintópicas de Rivulus (Cyprinodontiformes: Rivulidae) em igarapés da Reserva Ducke, Manaus, Amazonas Fernandes, Suzanne Sousa Deus, Cláudia Pereira de Zuanon, Jansen Alfredo Sampaio Peixes Poças temporárias Rivulidae This study aimed to analyze the trophic relations between Rivulus micropus, R. obscurus and R. kirovskyi in temporary ponds in the Reserva Florestal Adolpho Ducke, Amazonas, Brazil. Sampling was conducted between February and June 2013. A total of 149 specimens of R. micropus, 210 of R. kirovskyi and 23 of R. obscurus were captured. Diet was assessed using the stomach’s degree of filling (DF), relative volume (V%) and Frequency of Occurrence (FO%) of food items, that were used for the calculation of the Feeding Index (FIi). The feeding strategies were presented separately by species and according to the condition of sintopy. Analyses of trophic niche breadth were carried out at the individual and species level (Levins’ index), and dietary overlap (Morisita-Horn’s index) was calculated between two pairs of species: R. micropus with R. kirovskyi; and R. kirovskyi with R. obscurus. The three species were classified as invertivorous. The food spectrum of R. micropus included 25 items, represented mainly by Hymenoptera. The diet of R. kirovskyi was represented by 22 items, with a predominance of autochthonous resources, especially chironomid larvae, and the niche breadth of the species was narrow. Rivulus obscurus presented 13 food items comprised by both autochthonous and allochthonous resources, mainly nymphs of Hemiptera and Hymenoptera; its niche breadth was wider when compared to the other two species, but showed inter-individual variation with some individuals showing narrower trophic niche. There was a very low dietary overlap between pairs of species under syntopic occurrence when compared to the diet of individuals in a single-species condition in the ponds, which may indicate therefore competition and niche displacement. The three species used the most abundant food resources in the ponds, but showed some degree of feeding selectivity, especially in relation to the origin of the items (autochthonous or allochthonous). The ingestion of prey does not seem to be determined only by the abundance or availability in the environment, but perhaps by its energy content, which would be in agreement to the optimal foraging theory. Este estudo teve como objetivo analisar as relações tróficas entre Rivulus micropus, R. kirovskyi e R. obscurus em ambientes de poças temporárias na Reserva Florestal Adolpho Ducke. As coletas foram realizadas entre fevereiro e junho de 2013. Foram capturados 382 indivíduos, sendo 149 R. micropus, 210 R. kirovskyi e 23 R. obscurus. Para a análise das dietas foram verificados o Grau de Repleção dos estômagos, Volume Relativo (V%) e a Frequência de Ocorrência (FO%) dos itens alimentares, combinados no cálculo do Índice Alimentar (IAi). Gráficos de estratégias alimentares foram elaborados para cada espécie e de acordo com a situação de sintopia nas poças. Análises de amplitude de nicho foram realizadas em nível individual e de espécie (Índice de Levins) e o Índice de sobreposição alimentar (Morisita-Horn) foi calculado entre dois pares de espécies: Rivulus micropus com R. kirovskyi, e R. kirovskyi com R. obscurus. As três espécies foram classificadas como invertívoras. O espectro alimentar de R. micropus incluiu 25 itens, representados principalmente por Hymenoptera. A dieta de Rivulus kirovskyi foi representada por 22 itens, com predomínio de invertebrados autóctones, principalmente larvas de Chironomidae, e a baixa amplitude de nicho. Rivulus obscurus apresentou 13 itens na dieta, consumindo alimentos de origem autóctone e alóctone, principalmente Hemiptera (ninfas) e Hymenoptera. Essa espécie apresentou maior amplitude de nicho, quando comparada às outras duas espécies; entretanto, houve variação interindividual, sendo que alguns indivíduos apresentaram nicho mais estreito. Houve baixa sobreposição alimentar entre os pares de espécies em ocorrência sintópica quando comparadas com situações de orcorr~encia isolada nas poças, o que pode indicar a existência de competição entre elas. As três espécies utilizaram os recursos alimentares mais abundantes nas poças, porém apresentaram certo grau de seletividade alimentar, principalmente em relação à origem (autóctone ou alóctone). A ingestão das presas não parece ser determinada exclusivamente pela sua maior oferta ou disponibilidade no ambiente, mas (talvez) pelo seu conteúdo energético, o que estaria de acordo com a teoria de forrageamento ótimo. 2020-02-13T18:21:50Z 2020-02-13T18:21:50Z 2014-06-10 Dissertação https://repositorio.inpa.gov.br/handle/1/11243 http://lattes.cnpq.br/8522587724940766 por Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Instituto Nacional de Pesquisas da Amazônia - INPA Biologia de Água Doce e Pesca Interior - BADPI
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language por
topic Peixes
Poças temporárias
Rivulidae
spellingShingle Peixes
Poças temporárias
Rivulidae
Fernandes, Suzanne Sousa
Relações tróficas entre três espécies sintópicas de Rivulus (Cyprinodontiformes: Rivulidae) em igarapés da Reserva Ducke, Manaus, Amazonas
topic_facet Peixes
Poças temporárias
Rivulidae
description This study aimed to analyze the trophic relations between Rivulus micropus, R. obscurus and R. kirovskyi in temporary ponds in the Reserva Florestal Adolpho Ducke, Amazonas, Brazil. Sampling was conducted between February and June 2013. A total of 149 specimens of R. micropus, 210 of R. kirovskyi and 23 of R. obscurus were captured. Diet was assessed using the stomach’s degree of filling (DF), relative volume (V%) and Frequency of Occurrence (FO%) of food items, that were used for the calculation of the Feeding Index (FIi). The feeding strategies were presented separately by species and according to the condition of sintopy. Analyses of trophic niche breadth were carried out at the individual and species level (Levins’ index), and dietary overlap (Morisita-Horn’s index) was calculated between two pairs of species: R. micropus with R. kirovskyi; and R. kirovskyi with R. obscurus. The three species were classified as invertivorous. The food spectrum of R. micropus included 25 items, represented mainly by Hymenoptera. The diet of R. kirovskyi was represented by 22 items, with a predominance of autochthonous resources, especially chironomid larvae, and the niche breadth of the species was narrow. Rivulus obscurus presented 13 food items comprised by both autochthonous and allochthonous resources, mainly nymphs of Hemiptera and Hymenoptera; its niche breadth was wider when compared to the other two species, but showed inter-individual variation with some individuals showing narrower trophic niche. There was a very low dietary overlap between pairs of species under syntopic occurrence when compared to the diet of individuals in a single-species condition in the ponds, which may indicate therefore competition and niche displacement. The three species used the most abundant food resources in the ponds, but showed some degree of feeding selectivity, especially in relation to the origin of the items (autochthonous or allochthonous). The ingestion of prey does not seem to be determined only by the abundance or availability in the environment, but perhaps by its energy content, which would be in agreement to the optimal foraging theory.
author_additional Deus, Cláudia Pereira de
author_additionalStr Deus, Cláudia Pereira de
format Dissertação
author Fernandes, Suzanne Sousa
title Relações tróficas entre três espécies sintópicas de Rivulus (Cyprinodontiformes: Rivulidae) em igarapés da Reserva Ducke, Manaus, Amazonas
title_short Relações tróficas entre três espécies sintópicas de Rivulus (Cyprinodontiformes: Rivulidae) em igarapés da Reserva Ducke, Manaus, Amazonas
title_full Relações tróficas entre três espécies sintópicas de Rivulus (Cyprinodontiformes: Rivulidae) em igarapés da Reserva Ducke, Manaus, Amazonas
title_fullStr Relações tróficas entre três espécies sintópicas de Rivulus (Cyprinodontiformes: Rivulidae) em igarapés da Reserva Ducke, Manaus, Amazonas
title_full_unstemmed Relações tróficas entre três espécies sintópicas de Rivulus (Cyprinodontiformes: Rivulidae) em igarapés da Reserva Ducke, Manaus, Amazonas
title_sort relações tróficas entre três espécies sintópicas de rivulus (cyprinodontiformes: rivulidae) em igarapés da reserva ducke, manaus, amazonas
publisher Instituto Nacional de Pesquisas da Amazônia - INPA
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/11243
http://lattes.cnpq.br/8522587724940766
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score 11.755432

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