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Biology of growth of Hoplias aff. malabaricus (Bloch, 1794) in a shallow pampean lake (Argentina) Neotropical Ichthyology
Balboni,Leandro; Colautti,Dario César; Baigún,Claudio Rafael Mariano.
The trahira Hoplias aff. malabaricus is a top predator in pampean shallow lakes and is highly appreciated by recreational anglers and artisanal fishermen. Trahira growth from Yalca shallow lake was determined by lepidological analysis and age validated by marginal increment. When growth was fitted to the von Bertalanffy model, annual classes exhibited a bimodal pattern as a result of the presence of spring and summer annual cohorts associated with a three month spawning season, each period in turn showing different growth patterns. The trahira population-age structure at Yalca shallow lake showed a truncated profile with very low numbers of large adults and few individuals older than three to four years, thus producing an unbalanced length-structure...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Age validation; Biological indices; Neotropical fish; Piscivorous fish; Trahira.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200022
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Effects of natural and anthropogenic environmental changes on riverine fish assemblages: a framework for ecological assessment of rivers BABT
Tejerina-Garro,Francisco Leonardo; Maldonado,Mabel; Ibañez,Carla; Pont,Didier; Roset,Nicolas; Oberdorff,Thierry.
Freshwater is a basic need for the mankind. Effective biological tools (ecologically based, efficient, rapid and consistently applicable to different ecological regions) are needed to measure the "health" of rivers. Adapting such tools over a broad geographic area requires a detailed understanding of both the patterns of organisms assemblage composition and distribution within and among water bodies under natural conditions, and the nature of the major environmental gradients that cause or explain these patterns. A comprehensive review of the available litterature dealing with the identification of environmental factors structuring riverine fish assemblages under natural conditions permits to identify the most consistent ones.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological indices; Fish community; Environmental parameters; Habitat.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000100013
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Tests and jaws’ morphological patterns of regular sea urchin Paracentrotus lividus (Lamarck, 1816) in relation to environmental conditions ArchiMer
Caill-milly, Nathalie; Mahias, Jérémy; Bru, Noelle; De Casamajor, Marie-noelle; Pigot, Thierry; Corbet, Paul.
This paper investigates whether morphological variability of test and Aristotle’s lantern can be detected in sea urchins exposed to domestic pollution and whether this variability can be also related to tidal level and hydrodynamic features. The study was conducted on four sites along the French Basque coast. Each site is characterized by its geological layers’ orientation, regardless of its proximity to sewage outlets. Analyses on high-resolution pictures of jaws were performed and three parameters were retained: length, height and demipyramid dry mass. Five shape descriptors were consequently defined regarding the test and the jaws. Individuals with heavy test density associated with highly developed demipyramid regarding test diameter and height were...
Tipo: Text Palavras-chave: Morphometry; Body size; Aristotle's lantern; Sewage discharge; Coastal zone; Biological indices.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00612/72402/71347.pdf
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