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Documents disponibles écrits par cet auteur (9)
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Article
Ylva S. Olsen, Auteur ; Ivan Valiela, AuteurWe examined the effect of nutrients and grazers on Thalassia testudinum in Jobos Bay, Puerto Rico by fertilizing sediment and manipulating grazer abundances. Bottom-up effects were variable: Added nutrients did not increase seagrass aboveground [...]
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Ivan Valiela, Auteur
Article
Joanna K. York, Auteur ; Gabrielle Tomasky, Auteur ; Ivan Valiela, Auteur ; Anne E. Giblin, AuteurWe measured fluxes of NH4+ and NO3- and delta N-15 of NH4+, sediment, and porewater NH4+ from incubated sediment cores along a nitrate gradient and in different seasons from Childs River, MA. NH4+ flux was low at the downstream site with the low[...]
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Ivan Valiela, Auteur ; Megan Bartholomew, AuteurAdjoined watershed-estuary-coastal ecosystems are coupled by biogeochemical and hydrodynamic processes, as Scott Nixon repeatedly argued in his many contributions. Case histories from Waquoit Bay and the Pacific Coast of Panama, supplemented by [...]
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Sophia E. Fox, Auteur ; Erica Stieve, Auteur ; Ivan Valiela, Auteur ; Jennifer Hauxwell, Auteur ; James McClelland, Auteur
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Ivan Valiela, Auteur ; Carlos Duarte, Auteur ; Robinson W. Fulweiler, Auteur
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Carol S. Rietsma, Auteur ; Rita Oliveira Monteiro, Auteur ; Ivan Valiela, AuteurTo assess responses and recovery of salt marsh grass species, we manipulated external nutrient supply and removed shoots of Spartina alterniflora or Spartina patens from fertilized and control plots in a Massachusetts marsh. The pulse-and-recove[...]
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Sophia E. Fox, Auteur ; Mirta Teichberg, Auteur ; Ivan Valiela, Auteur ; Leanna Heffner, AuteurUnderstanding whether nutrient availability and grazing by consumers can control macroalgal growth is important to mitigate blooms. To assess the effect of long-term nitrogen loading on macroalgae, we ran a field experiment in which we measured [...]
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Liza Fox, Auteur ; Ivan Valiela, Auteur ; Erin L. Kinney, AuteurNitrogen inputs restructure ecosystems and can interact with other agents of ecological change and potentially intensify them. To examine the effects of nitrogen combined with those of elevation and competition, in 2005 we mapped vegetation and [...]
