Resultados de Búsqueda por Autor

1

artículo

Structural and defensive roles of angiosperm leaf venation network reticulation across an Andes-Amazon elevation gradient

Publicado por
Blonder, Benjamin, Salinas, Norma, Bentley, Lisa Patrick, Shenkin, Alexander, Chambi Porroa, Percy Orlando, Valdez Tejeira, Yolvi, Boza Espinoza, Tatiana Erika, Goldsmith, Gregory R., Enrico, Lucas, Martin, Roberta, Asner, Gregory P., Díaz, Sandra, Enquist, Brian J., Malhi, Yadvinder

Publicado 2018

Enlace

The network of minor veins of angiosperm leaves may include loops (reticulation). Variation in network architecture has been hypothesized to have hydraulic and also structural and defensive functions.We measured venation network trait space in eight dimensions for 136 biomass-dominant angiosperm tree species along a 3,300 m elevation gradient in southeastern Peru. We then examined the relative importance of multiple ecological and evolutionary predictors of reticulation.Variation in minor venation network reticulation was constrained to three axes. These axes described reconnecting vs. branching veins, elongated vs. compact areoles compact vs. elongated and low vs. high-density veins. Variation in the first two axes was predicted by traits related to mechanical strength and secondary compounds, and in the third axis by site temperature.Synthesis. Defensive and structural factors primaril...

2

artículo

Solar radiation and functional traits explain the decline of forest primary productivity along a tropical elevation gradient

Publicado por
Fyllas, Nikolaos M., Bentley, Lisa Patrick, Shenkin, Alexander, Asner, Gregory P., Atkin, Owen K., Díaz, Sandra, Enquist, Brian J., Farfan-Rios, William, Gloor, Emanuel, Guerrieri, Rossella, Huasco, Walter Huaraca, Ishida, Yoko, Martin, Roberta E., Meir, Patrick, Phillips, Oliver, Salinas, Norma, Silman, Miles, Weerasinghe, Lasantha K, Zaragoza-Castells, Joana, Malhi, Yadvinder

Publicado 2017

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One of the major challenges in ecology is to understand how ecosystems respond to changes in environmental conditions, and how taxonomic and functional diversity mediate these changes. In this study, we use a trait-spectra and individual-based model, to analyse variation in forest primary productivity along a 3.3 km elevation gradient in the Amazon-Andes. The model accurately predicted the magnitude and trends in forest productivity with elevation, with solar radiation and plant functional traits (leaf dry mass per area, leaf nitrogen and phosphorus concentration, and wood density) collectively accounting for productivity variation. Remarkably, explicit representation of temperature variation with elevation was not required to achieve accurate predictions of forest productivity, as trait variation driven by species turnover appears to capture the effect of temperature. Our semi-mechanist...

3

informe técnico

Leaf-level photosynthetic capacity in lowland Amazonian and high-elevation Andean tropical moist forests of Peru

Publicado por
Bahar, Nur H. A., Ishida, Françoise Yoko, Weerasinghe, Lasantha K., Guerrieri, Rossella, O'Sullivan, Odhran S., Bloomfield, Keith J., Asner, Gregory P., Martin, Roberta E., Lloyd, Jon, Malhi, Yadvinder, Phillips, Oliver L., Meir, Patrick, Salinas, Norma, Cosio, Eric G., Domingues, Tomas F., Quesada, Carlos A., Sinca, Felipe, Escudero Vega, Alberto, Zuloaga Ccorimanya, Paola P., del Águila Pasquel, Jhon, Quispe Huaypar, Katherine, Cuba Torres, Israel, Butrón Loayza, Rosalbina, Pelaez Tapia, Yulina, Huaman Ovalle, Judit, Long, Benedict M., Evans, John R., Atkin, Owen K.

Publicado 2016

Enlace

Analiza si las variaciones en la capacidad fotosintética están vinculadas a las variaciones en el medio ambiente y/o a los rasgos foliares asociados para los bosques húmedos tropicales (BHT) en las regiones de los Andes/Amazonía occidental de Perú. Comparamos la capacidad fotosintética (tasa máxima de carboxilación de la enzima Rubisco (Vcmax), y la tasa máxima de transporte de electrones Jmax), la masa foliar, el nitrógeno (N) y el fósforo (P) por unidad de área foliar (Ma, Na y Pa, respectivamente), y la clorofila de 210 especies en 18 sitios de campo a lo largo de un gradiente de elevación de 3300 m. Se utilizaron Western blots para cuantificar la abundancia de la enzima fijadora de CO2 Rubisco. Las tasas de capacidad fotosintética basadas en el área y en el N a 25°C fueron más altas en las TMF de las tierras altas que en las de las tierras bajas, respaldadas por una ...