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Morphometric and biotic variables as potential predictors of Ludwigia sedoides (Humb. & Bonpl.) Hara in a large Amazonian reservoir

Published online by Cambridge University Press:  04 April 2014

Marcus Vinicius Moreira Barbosa ,
Josilaine Taeco Kobayashi  and
Fernando Mayer Pelicice
Marcus Vinicius Moreira Barbosa
Affiliation:
Programa de Pós-Graduação em Ecologia de Ecótonos, Universidade Federal do Tocantins, Porto Nacional, Tocantins, Brazil
Josilaine Taeco Kobayashi
Affiliation:
Fundação Universidade do Tocantins (Unitins), Palmas, Tocantins, Brazil
Fernando Mayer Pelicice*
Affiliation:
Núcleo de Estudos Ambientais (Neamb), Universidade Federal do Tocantins, Porto Nacional, Tocantins, Brazil
*
*Corresponding author: [email protected]
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Abstract

Reservoirs cause hydrological changes (i.e., water level stabilization) that favor the colonization of aquatic macrophytes. Knowing the ecological factors that determine the occurrence of these plants is critical for water management (e.g., plant control) and biodiversity conservation. In this sense, the present study investigated colonization patterns of Ludwigia sedoides in Lajeado reservoir (Tocantins River, Amazon Basin), in order to identify variables that influence colonization at habitat scale. We investigated the relationship between colonization (coverage area and occurrence) and morphometric (fetch, slope, depth and distance from shoreline) and biotic variables (local diversity of macrophytes and co-occurrence patterns). Stepwise regression selected fetch, depth and slope as the best variables to explain the variation in L. sedoides coverage, which together explained 46% of data variability. Fetch and slope were negatively correlated with coverage, whereas depth showed a positive correlation. No biotic variable was included in the model (P>0.05). However, the investigation of the geometric shape of bivariate correlations (null models) showed positive relationships with local species richness and richness of life forms (i.e., submerged, emergent, floating and epiphytic). In addition, an analysis of species co-occurrence (C-score) revealed that L. sedoides is negatively associated with some macrophyte species. We believe, however, that these results may be associated with species preferences for particular environmental conditions. In conclusion, the present study indicated that morphometric variables are potential predictors of the colonization of L. sedoides in Lajeado reservoir. Sheltered sites with low slope and moderate depths represent favorable environment for colonization and growth.

Keywords

co-occurrencedepthfetchslopespatial distribution
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 50 , Issue 2 , 2014 , pp. 163 - 171
Copyright
© EDP Sciences, 2014

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