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Previous issue date: 2014-07-04 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / O peixe tra?ra, Hoplias malabaricus (Erythrinidae) e o peixe cascudo, Hypostomus pusarum (Loricariidae) s?o peixes de ?gua doce, da regi?o neotropical de consider?vel import?ncia ecol?gica e econ?mica. O trabalho teve como objetivo investigar as estrat?gias tr?ficas e a morfo-histologia do trato digest?rio desses peixes no a?ude Marechal Dutra, Acari, do semi?rido do Rio Grande do Norte, Brasil. Foram analisados 133 exemplares de tra?ra, H. malabaricus e 118 esp?cimes de cascudo, H. pusarum. As duas esp?cies estudadas apresentam diferentes n?veis de cadeia alimentar e ocupa??o espacial na coluna de ?gua do a?ude. Os resultados do trabalho est?o apresentados sob a forma de quatro artigos cient?ficos. O primeiro artigo descreve a anatomia e a histologia do trato digestivo e os h?bitos alimentares da tra?ra, H. malabaricus. O intestino da tra?ra ? curtocom um coeficiente intestinal de 0,72 ? 0,09. O ?ndice de import?ncia alimentar demonstrou que H. malabaricus se alimenta preferencialmente de material animal, sendo 72,8% de peixes e 27,2% de camar?es. A histologia do seu tubo digest?rio confirma seu h?bito alimentar carn?voro. O segundo artigo aborda um estudo pioneiro sobre os h?bitos alimentares e a caracteriza??o anat?mica e histol?gica do trato digest?rio de H. pusarum. O intestino do cascudo ? longo com um coeficiente intestinal de 10.8?0.7. O ?ndice de import?ncia alimentar demonstrou que H. pusarum se alimenta preferencialmente de material org?nico em decomposi??o (88.7%) e microalgas filamentosas e diatom?ceas (11.3%). O terceiro artigo compara os aspectos morfol?gicos do trato digest?rio de H. malabaricus e H. pusarum, relacionando-os com seu h?bito alimentar. A disposi??o dos ?rg?os digest?rios em ambas as esp?cies est? diretamente relacionada com a forma da cavidade peritoneal e o formato do corpo. O intestino curto em H. malabaricus e muito longo em H. pusarum est? relacionado com seus h?bitos alimentares. A morfologia dos tubos digest?rios de H. malabaricus e H. pusarum confirmam seus h?bitos alimentares, carn?voro e detrit?voro/herb?voro, respectivamente. O quarto artigo aborda os aspectos alimentares e reprodutivos (estrutura de comprimento e peso, rela??o peso-comprimento, tipo de crescimento, propor??o sexual) do cascudo, H. pusarum. A esp?cie apresenta crescimento alom?trico negativo, com a predomin?ncia de f?meas na popula??o amostrada.Hoplias malabaricus, que habita o ambiente pel?gico, ? considerado carn?voro, enquanto que H. pusarum, que habita o ambiente bent?nico, ? caracterizado como detrit?voro/herb?voro. Cada esp?cie estudada mostra um regime alimentar bem diferente, sem que haja competi??o tr?fica entre elas. As estruturas morfo-anat?micas do trato digest?rio refletem sua estrat?gia alimentar. / The fish, Hoplias malabaricus (Osteichthyes: Erythrinidae) and armored catfish,
Hypostomus pusarum (Loricariidae) are of freshwater origin from the neotropical region, and
are considered ecologically and economically of important. This work investigated the trophic
strategies, the morphology and histology of the digestive tract of these fish captured from the
Marechal Dutra reservoir, Acari, the semiarid region of Rio Grande do Norte, Brazil. A total
of 133 individuals of H. malabaricus and 118 specimens of H. pusarum were analyzed. The
two study species occupy different levels in the food chain and spatial distribution in the
water column of the reservoir. The results of this study are presented in the form of four
scientific papers. The first article describes the morphology and histology of the digestive
tract and the feeding habits of H. malabaricus (Bloch, 1794). This fish has a short intestine,
with an intestinal coefficient of 0.72 ? 0.09. The dietary importance index indicates that H.
malabaricus feeds preferentially on animal matter, especially on fish (72.8%) and prawns
(27.2%). The histology of its digestive tract confirms the carnivorous feeding habit. The
second article discusses about the pioneering work on the feeding strategy and the
characterization of anatomy and histology of the digestive tract of H. pusarum. The intestine
of this fish is long, with an intestinal coefficient of 10.8?0.7. The dietary importance index
indicates that H. pusarum feeds preferentially on organic matter in decomposition (88.7%)
and on filamentous microalgae and diatoms (11.3%). The third article compares the
morphological aspects of the digestive tract of H. malabaricus and H. pusarum, in relation to
their food habits. The arrangement of the digestive organs in both species is directly related to
the shape of the peritoneal cavity and the form of the body. The short intestine of H.
malabaricus and the long intestine of H. pusarum are associated with their feeding habits. The
morphology of the digestive tracts of H. malabaricus and H. pusarum confirm their food
habits, carnivorous and detritivorous / herbivorous, respectively. The fourth article discusses
the food and reproductive aspects (length and weight, length-weight relationship, type of
growth and sex ratio) of H. pusarum. This species has a negatively allometric growth, with
the predominance of females in the sampled population. H. malabaricus inhabits the pelagic
environment and is a carnivore, while H. pusarum, lives in the benthic environment and is
characterized as a detritivore/herbivore. Each species studied shows a very different diet,
without trophic competition between them. The morphological and anatomical structures of
the digestive tract reflect their feeding strategy.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21267 |
| Date | 04 July 2014 |
| Creators | Pessoa, Emilly Kataline Rodrigues |
| Contributors | 15644812472, http://lattes.cnpq.br/4657086910453785, Brasil, Deusimar Freire, 02032604817, http://lattes.cnpq.br/1289770421989278, Passavante, Jos? Zanon de Oliveira, 00614874791, http://lattes.cnpq.br/7147339394595199, Gurgel, Liliane de Lima, 03095950454, http://lattes.cnpq.br/8383861001436139, Farias, Naisandra Bezerra da Silva, 91439760420, Souza, Arrilton Ara?jo de, Chellappa, Sathyabama |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM PSICOBIOLOGIA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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