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Growth Differences in Cultured Populations of Brachionus plicatilis Müller Caused by Heavy Metal Stress as Function of Microalgal Diet

AutorMoreno-Garrido, Ignacio ; Lubián, Luis M. ; Soares, A. M. V. M.
Palabras claveHeavy metals
Microalgal diet
Fecha de publicación1-sep-1999
CitaciónBulletin Environmental Contamination and Toxicology 63(3): 392-398 (1999)
ResumenBioassays with few rotifer species are commonly used in marine ecotoxicology (Snell & Janssen, 1995). These organisms play a key role in the coastal marine ecosystem (Wallace & Snell, 1991). In addition, rotifers show fast turnover rates, contributing to the nutrient recycling of aquatic habitats. By having a high assimilation efficiency, they convert most of food into biomass, making it available to higher trophic levels (Starkwather, 1987). B. plicatilis is a very common rotifer species used in ecotoxicology because of the easy culturing, and the large amount of biological information of this taxon (Pozuelo & Lubián, 1993). There is a wide variety of bioassays developed on these organisms, using population growth rate (Snell & Moffat, 1992), ingestion rate (Ferrando et al., 1993), survivorship (Del Valls et al., 1996), motility (Charoy et al., 1995) or the enzymatic activity (Moffat & Snell, 1994) as endpoints. It is well known that a microalgal diet for rotifers of this species is more stable than others (such a baker's yeast diet) (Hirayama, 1987), but there is a wide list of microalgal species that can be used for feeding rotifers. In this work differences between growth curves of populations of B. plicatilis fed with combinations of three different microalgae (D. salina, N. gaditana and I. aff. galbana), have been studied when populations are stressed by sub-lethal concentrations of two heavy metals (Cd or Cu). Toxicity of these heavy metals for rotifers (Snell & Persoone, 1989) and microalgae (Moreno-Garrido, 1997) has been demonstrated. On the other hand, biomaginifcation processes can be expected, because microalgae seem to be good bioaccumulators for heavy metals (Moreno-Garrido et al., 1998).
Descripción7 páginas, 2 figuras, 3 tablas.
Versión del editorhttp://dx.doi.org/10.1007/s001289900993
ReferenciasPMID: 10475919
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