<b>Trophic ecology of <i>Loricariichthys melanocheilus</i> Reis & Pereira, 2000 (Siluriformes: Loricariidae) in Ibicuí river, southern Brazil

  • Éverton Luís Zardo Universidade Federal do Rio Grande do Sul
  • Everton Rodolfo Behr Universidade Federal de Santa Maria
Palavras-chave: feeding activity, feeding habits, intestinal quotient, stomach fullness, trophic spectrum

Resumo

 

Aiming to characterize aspects of the trophic ecology of Loricariichthys melanocheilus in the Ibicuí river, bimonthly samples were taken in lotic and lentic ecosystems. Fish were caught and fixed in 10% formalin and dissected for stomach content analysis. Items were identified to the lowest taxonomic level possible. Stomach fullness (SF), repletion index (RI) and intestinal quotient (IQ) were estimated. Diet was assessed by the frequency of occurrence and the volumetric method, combined to obtain a Alimentary index. Feeding activity was analyzed with mean values of SF, RI and vacuity index (VI), which represents the percentage of empty stomachs. These parameters were compared seasonally, spatially, and according to the circadian rhythm. The main items in the trophic spectrum of L. melanocheilus were detritus, sediment, plant organic matter, nematodes, micro crustaceans (Copepoda, Cladocera) and insects (Diptera, Trichoptera, Ephemeroptera and Odonata). No environmental or seasonal variations were found for the consumed items. Feeding activity showed seasonal and environmental variations according to RI but did not significantly change according to SF. The IQ was 1.51, and showed seasonal variations, indicating changes in the diet.

 

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Biografia do Autor

Éverton Luís Zardo, Universidade Federal do Rio Grande do Sul
Universidade Federal do Rio Grande do Sul - Programa de Pós graduação em Zootecnia - Produção e conservação da biodiversidade das espécies aquáticas (AQUAM).
Publicado
2016-07-21
Como Citar
Zardo, Éverton L., & Behr, E. R. (2016). <b>Trophic ecology of <i>Loricariichthys melanocheilus</i&gt; Reis & Pereira, 2000 (Siluriformes: Loricariidae) in Ibicuí river, southern Brazil. Acta Scientiarum. Biological Sciences, 38(1), 67-76. https://doi.org/10.4025/actascibiolsci.v38i1.26384
Seção
Morfofisiologia Animal

 

0.6
2019CiteScore
 
 
31st percentile
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0.6
2019CiteScore
 
 
31st percentile
Powered by  Scopus