Isaac A, Fernandes A, Ganassin M J M, Hahn N S
Ictiologia e Aquicultura - Nupelia, Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais - PEA, Departamento de Biologia - DBI, Universidade Estadual de Maringá - UEM, Maringá, PR, Brazil.
Braz J Biol. 2014 Aug;74(3 Suppl 1):S16-22. doi: 10.1590/1519-6984.18312.
The composition of the diets of 66 species of fishes was investigated from September 2009 to June 2010 in three subsystems of the Upper Paraná River floodplain (Brazil), following invasion by the two mollusk species Limnoperna fortunei (Dunker, 1857) and Corbicula fluminea (Müller, 1774), and the macrophyte Hydrilla verticillata (L.f.) Royle. Limnoperna fortunei was consumed in all three subsystems and occurred in the diet of 15 fish species, with a high proportion in the diet of Leporinus obtusidens. Corbicula fluminea was present in the diet of Pterodoras granulosus caught in the Paraná and Ivinheima subsystems. Hydrilla verticillata occurred in the diet of Schizodon nasutus caught in the Ivinheima and Paraná subsystems. It is not yet possible to evaluate the potential of these species to control invasive mollusks in the study area or the impact of these species on the structure of the food chain. Omnivorous and herbivorous fishes in the study area may have little impact on the population of H. verticillata.
2009年9月至2010年6月，在巴西上巴拉那河泛滥平原的三个子系统中，对66种鱼类的饮食组成进行了调查，这些子系统受到两种软体动物福寿螺（Limnoperna fortunei，邓卡，1857年）、河蚬（Corbicula fluminea，米勒，1774年）以及大型水生植物黑藻（Hydrilla verticillata，（L.f.）罗伊尔）入侵。在所有三个子系统中都发现了福寿螺被鱼类食用，15种鱼类的食物中含有福寿螺，钝吻兔脂鲤（Leporinus obtusidens）的食物中福寿螺占比很高。在巴拉那和伊维内河子系统捕获的粒鲶（Pterodoras granulosus）的食物中发现了河蚬。在伊维内河和巴拉那子系统捕获的长吻裂齿脂鲤（Schizodon nasutus）的食物中发现了黑藻。目前还无法评估这些物种在研究区域控制入侵软体动物的潜力，或者这些物种对食物链结构的影响。研究区域内的杂食性和草食性鱼类可能对黑藻种群影响较小。
