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 - 471
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.