Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorMarshall, Bruce Gavin-
dc.contributor.authorForsberg, Bruce Rider-
dc.contributor.authorThomé-Souza, Mario J.F.-
dc.description.abstractThe cardinal tetra (Paracheirodon axelrodi) is the most abundant species of the Brazilian ornamental fish trade, constituting more than 80% of the ornamental fish collected in the middle Negro River basin. Stable isotope analyses were used to identify the autotrophic carbon sources and trophic position for the cardinal in relation to the plant groups at the base of its foodchain. Filamentous algae, tree and plant leaves and cardinals were collected in stream habitats, flooded forest and interfluvial swamps (campos) during peak flood, falling water and low water periods. δ15N values of the cardinal in relation to the plants at the base of the food chain indicated a trophic position of omnivore. Values of δ13C for the plants ranged from -43.1 to -26.4‰, with averages of -37.6, -30.4, and -29.4‰ for filamentous algae, flooded forest leaves, and campo leaves, respectively. The δ13C values for the cardinal ranged from -35.0 to -27.9‰, with an average of -31.4‰. Relative contributions of plants to fish carbon were estimated in a two end-member mixing model which determined that the leaves (flooded forest and campo leaves combined) and filamentous algae had average relative contributions to cardinal carbon of 71% and 29%, respectively. However, seasonal variation in the relative contributions was encountered throughout the hydrological cycle. The cardinals least enriched in 13C were encountered in November during the falling water period, indicating that they had perhaps recently migrated down from interfluvial campos where filamentous algae production is significant. Considering that algal production has been reported to be less than 1% of total primary production in the Negro River, these results could suggest some evidence of selective herbivory in the cardinal's food chain. © 2007 Springer Science+Business Media B.V.en
dc.relation.ispartofVolume 596, Número 1, Pags. 95-103pt_BR
dc.subjectAutotrophic Energy Sourcesen
dc.subjectInterfluvial Swampsen
dc.subjectStream Habitatsen
dc.subjectMarine Biologyen
dc.subjectCommercial Speciesen
dc.subjectEcological Modelingen
dc.subjectFilamentous Algaen
dc.subjectPrimary Productionen
dc.subjectSeasonal Variationen
dc.subjectTrophic Structureen
dc.subjectRio Negro [south America]en
dc.subjectSouth Americaen
dc.subjectParacheirodon Axelrodien
dc.titleAutotrophic energy sources for Paracheirodon axelrodi (Osteichthyes, Characidae) in the middle Negro River, Central Amazon, Brazilen
Appears in Collections:Artigos

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.