INVESTIGADORES
LEGGIERI Leonardo RamÓn
congresos y reuniones científicas
Título:
Nutrient effects on stoichiometry in streams: an interbiome experiment
Autor/es:
MUÑOZ ISABEL; CASTRO MARÍA; DONATO JOHN; FEIJOÓ CLAUDIA SILVINA; GARCÍA-BERTHOU EMILI; GIORGI ADONIS DAVID NAZARENO; GÓMEZ NORA; LEGGIERI LEONARDO RAMÓN; OCÓN CAROLINA; RODRIGUES-CAPÍTULO ALBERTO; ROMANÍ ANNA; SABATER SERGI
Lugar:
Ciudad del Cabo
Reunión:
Congreso; XXXI Congress of the International Limnology Society (SIL); 2010
Resumen:
Increase of nutrient concentration is a global pressure for freshwater
ecosystems impaired by the accelerated land use changes. Ecological
Stoichiometry considers the relative balance of key elements (CNP) in trophic
interactions. Changes in nutrient inputs can cause changes in elemental
composition of basal resources that can extend to the whole aquatic food web.
The amplitude of the response will depend on site-specific environmental
conditions (light, temperature, hydrology, nutrient condition, food web
structure).The objectives of this study were: a) to contrast the effects of
nutrient enrichment on elemental composition of basal sources, and how this
enrichment affected the elemental composition of higher trophic levels and b)
to test these effects in streams from different bioclimatic regions. Three
streams under different biomes (a Mediterranean stream in NE Spain, a Pampean
stream in Argentina, and an Andean stream in N Colombia). The systems had the
same stream order but had specific temperature, background nutrient levels,
light and discharge. Basal food resources in the studied streams had very low
nutrient content. C:P and N:P ratios were high compared with other
food webs (terrestrial, planktonic). There was an important imbalance between
resources and consumers in the three streams. Nutrient inputs contribute to
diminished it but not in all the compartments. The highest reduction was
observed in C:P ratios.