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Tuesday, February 7 • 6:00pm - 9:00pm
Poster Display. Effects of Invasive Non-Native Aquatic Macrophytes on the Foraging and Diet Composition of Small-sized Fish

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AUTHORS: Natália Carniatto, Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Universidade Estadual de Maringá; Rosemara Fugi, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá

ABSTRACT: The effects of non- native invasive aquatic macrophytes on native communities have been reported for different types of ecosystems. In Rosana Reservoir, located in the Paranapanema River, Brazil, Urochloa arrecta, an aquatic grass native to Africa, occupies extensive coastal areas, and co-occurs with the native Eichhornia azurea, both emerging and rooted. In this context, the aim of this study is to evaluate the effects of invasive macrophyte on the composition and breadth of small-sized fish diet, using the native macrophyte as a control. Fish were collected in monospecific patches using Plaxiglas floating traps. Stomach contents were analyzed and differences in diet composition between macrophytes were tested by a MRPP, and the niche breadth was evaluated by Levins’ Index. The diet of Hemigrammus marginatus was predominantly composed of microcrustaceans (mainly Cladocera), Hyphessobrycon eques by invertebrates and microcrustaceans (mainly Chironomidae and Copepods), while the Pyrrhulina australis was predominantly composed of invertebrates (mainly Collembola) and Serrapinnus notomelas of algae and microcrustaceans (mainly Zygnemaphyceae and Cladocera). The MRPP result showed that the diet composition of three of the four species was significantly different between E. azurea and U. arrecta. This result is justified by the difference in consumption of invertebrates between the two different macrophytes. In addition, some items were exclusive in one of the macrophytes, as Tecameba, Harpacticoida and Decapod in E. azurea, and Lepidoptera and Odonata in U. arrecta. Hyphessobrycon eques and Pyrrhulina australis had the highest trophic niche breadth values when associated with U. arrecta (0.49 and 0.31 respectively), and Hemigrammus marginatus and Serrapinnus notomelas when associated with E. azurea (0.35 and 0.42 respectively). These results suggest that the two macrophytes are used as a foraging place, however, the composition and especially the abundance of invertebrates associated with macrophytes should differ, resulting in different availability of resources for the fish.

Tuesday February 7, 2017 6:00pm - 9:00pm
Lancaster Ballroom

Attendees (4)