INVESTIGADORES
MODENUTTI Beatriz Estela
artículos
Título:
Grazing impact of two aquatic invertebrates on periphyton from an Andean-patagonian stream.
Autor/es:
DÍAZ VILLANUEVA, VERÓNICA; RICARDO ALBARIÑO,; BEATRIZ ESTELA MODENUTTI O BEATRIZ MODENUTTI O B. MODENUTTI
Revista:
ARCHIV FUR HYDROBIOLOGIE
Editorial:
Schweitzer bart´sche Verhandlung
Referencias:
Lugar: Alemania; Año: 2004 vol. 159 p. 455 - 455
ISSN:
0003-9136
Resumen:
The mayfly Meridialaris chiloeensis and the snail Chilina dombeiana were observed to coexist and develop abundant populations in several Andean streams. In this study we examined and compared the mouthpart morphologies and the grazing mechanisms of these two species. In addition, through field experiments we analysed the grazing effect on periphyton composition and biomass. Results showed that the herbivores contrasted in their mouthpart morphology and foraging behaviour but would play a similar ecological role, since they both can be considered as scrapers. Experimental results indicated that the individual mayfly effect on chlorophyll-a and ash free dry mass was lower than that of the individual snail. However, considering the spring and autumn abundances of both populations in a natural environment, their grazing impact might be similar or even higher for the mayfly. In addition, M. chiloeensis observed to coexist and develop abundant populations in several Andean streams. In this study we examined and compared the mouthpart morphologies and the grazing mechanisms of these two species. In addition, through field experiments we analysed the grazing effect on periphyton composition and biomass. Results showed that the herbivores contrasted in their mouthpart morphology and foraging behaviour but would play a similar ecological role, since they both can be considered as scrapers. Experimental results indicated that the individual mayfly effect on chlorophyll-a and ash free dry mass was lower than that of the individual snail. However, considering the spring and autumn abundances of both populations in a natural environment, their grazing impact might be similar or even higher for the mayfly. In addition, M. chiloeensis Meridialaris chiloeensis and the snail Chilina dombeiana were observed to coexist and develop abundant populations in several Andean streams. In this study we examined and compared the mouthpart morphologies and the grazing mechanisms of these two species. In addition, through field experiments we analysed the grazing effect on periphyton composition and biomass. Results showed that the herbivores contrasted in their mouthpart morphology and foraging behaviour but would play a similar ecological role, since they both can be considered as scrapers. Experimental results indicated that the individual mayfly effect on chlorophyll-a and ash free dry mass was lower than that of the individual snail. However, considering the spring and autumn abundances of both populations in a natural environment, their grazing impact might be similar or even higher for the mayfly. In addition, M. chiloeensisM. chiloeensis depressed the rosette forming algae and favoured the prostrate ones. As a result, the mayfly grazing produced a community dominated by Nitzschia palea instead of Achnanthes minutissima that dominated the grazer-free controls, while the snail changed the taxonomic composition very little. changed the taxonomic composition very little. of Achnanthes minutissima that dominated the grazer-free controls, while the snail changed the taxonomic composition very little. changed the taxonomic composition very little. Nitzschia palea instead of Achnanthes minutissima that dominated the grazer-free controls, while the snail changed the taxonomic composition very little. changed the taxonomic composition very little. Achnanthes minutissima that dominated the grazer-free controls, while the snail changed the taxonomic composition very little.
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