Abstract

Feeding habits of Pterodoras granulosus (Valenciennes) (Pisces, Doradidae) in the lower Plata Basin. The feeding biology of Pterodoras granulosus (armored catfish) was studied in an extensive area comprising two environments of different characteristics, a typical lotic system, the Lower Paraná River, and an environment transitional towards an estuarian system on the right margin of the Río de la Plata. The relative importance of the different feeding items observed in the stomach content of Pterodoras granulosus represented the relative abundance of them in the environment. Therefore, P. granulosus appeared as a benthic, strongly euriphagic and hardly selective organism consuming vegetation and molluscs, whith little selectivity, its diet being dominated by vegetation in the Lower Paraná River and molluscs on the right margin of the Rio de la Plata. The mussel Limnoperna fortunei showed a high percentage of occurrence in all sampling sites. The eventual importance of the feeding habits of P. granulosus on the population density of C. limnoperna is discussed.

Highlights

  • DoknaLd hy vegetation in the ~ i w e r ~ arani ~ iav& e mr olluscs on the right margin of the Rio dela Plata

  • Fue descripto como omnivoro de habito macrofago con una dieta compuesta b8sicamente por frutas, semillas, vegetales diversos, crust&ceos y moluscos (Ringuelet et al, 1967), presel~talldonna marcada capaeidad adaptativa para el consumo de 10s alimentos mas abundantes en ol medio (Panattieri & Del Barco, 1981)

  • Los ejemplares de P, granulosus estudiados en el presente trabajo fueron capturados en dos sitios del Bajo Parana (Ibicuy y Otamendi), y en otros dos sobre la margen derecba del Rio de la PIata (Punta Lara y Magdalena) aharcando una zona de aproximadamente 240 kin entre 10spuntos m8s distantes

Read more

Summary

Introduction

DoknaLd hy vegetation in the ~ i w e r ~ arani ~ iav& e mr olluscs on the right margin of the Rio dela Plata.

Results
Conclusion
Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call