Data/hora: 12/06/2024 13:29:43

Provedor de dados: | 83
País: | Brazil
Título: | Feeding and body condition of an invasive fish species under different environmental conditions
Autores: | Pazianoto,Laryssa H. R.; Cionek,Vivian de M.; Fogaça,Fábio N. O.; Benedito,Evanilde.
Data: | 2016-01-01
Ano: | 2016
Palavras-chave: | Biological invasions; Detritivory; Energetic density; Hemiodus orthonops; Relative condition factor.
Resumo: | ABSTRACT Diet, energy density (ED) and relative condition factor (Kn ) were used to investigate the energetic assimilation of the invasive fish Hemiodus orthonops under different environmental condition of the upper rio Paraná floodplain. Samples were taken in June and September 2013 and 2014. Nutrient content was determined for sediment. The diet was combined in the Food Index (IAi%), ED was expressed in Kcal/g of dry weight and Kn was calculated by: Kn = Wt/We, where Wt is the total weight and We the expected weight. Detritus/sediment prevailed in the stomachs of specimens from Ivinhema and Baia, while Algae was the main item in Paraná, reflecting the resource availability. ED and Kn from Ivinhema specimens were the greatest, consequence of the quality of food and lower spent on searching and handling food. The Paraná specimens showed lower ED values, but higher Kn values, due to algae consumption, a nutrient-rich resource. Baia presented high aluminum concentration on the sediment and the lower pH values, which contribute to reduce the nutritional value of the detritus and the ED and Kn values of their specimens. In conclusion, H.orthonops is capable to take advantage of the resources availability in the different environments, ensuring their establishment.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100225
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/1982-0224-20150164
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.14 n.1 2016
Fonte: | info:eu-repo/semantics/openAccess