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Sugar Concentrations, Hummingbird Aggressiveness, And Community Composition In Monteverde, Costa Rica, August 2006, Paul Brooks, Jennifer M. Gillen
Sugar Concentrations, Hummingbird Aggressiveness, And Community Composition In Monteverde, Costa Rica, August 2006, Paul Brooks, Jennifer M. Gillen
Tropical Ecology and Conservation [Monteverde Institute]
We studied hummingbird communities in Cañitas, Monteverde, Puntarenas, Costa Rica to observe territorial tendencies when given high and low percentage sugar concentration of food resources at artificial feeders along the edge of a forest patch. We wanted to determine if community composition was disproportionately affected by more aggressive, and therefore territorial species. We observed interactions of hummingbirds at artificial feeders of 20 and 33% sugar concentration. We found a disproportionately high number of visits by Rufous-tailed Hummingbirds (Amazilia tzacatl) at both sets of feeders (52.5% at 20% feeders and 89.4% at 33% feeders). We found a higher frequency of visits …
Population Distribution And Variability Of Mucosal-Sheath Mass Of Calastoma Cinnabarium In The Cloud Forest Of Monteverde, Costa Rica, August 2006, Cecilia Sorensen, Tanner Scrivens
Population Distribution And Variability Of Mucosal-Sheath Mass Of Calastoma Cinnabarium In The Cloud Forest Of Monteverde, Costa Rica, August 2006, Cecilia Sorensen, Tanner Scrivens
Tropical Ecology and Conservation [Monteverde Institute]
Comprising an entire kingdom to themselves, fungi have been poorly studied relative to their diversity and importance across ecosystems. Calastoma cinnabarium is one of these widely distributed but understudied mushrooms found throughout the Americas. The purpose of this study was to examine its elevational distribution at Monteverde, Costa Rica and adaptive value of its distinctive mucosal-sheath to investigate its possible role in moisture regulation. Population censuses were conducted along an elevational gradient through two life zones in the Monteverde Cloud Forest in parallel with a study determining mucosal-sheath mass to cap size diameter. Additionally, the adaptive value of mucosal-sheathing was …
Avian Feeding Guild Diversity In Sun-Grown And Shade-Grown Coffee Farms In San Luis Valley, Monteverde, Costa Rica, 2006, Anna Richey, Toria Waldron
Avian Feeding Guild Diversity In Sun-Grown And Shade-Grown Coffee Farms In San Luis Valley, Monteverde, Costa Rica, 2006, Anna Richey, Toria Waldron
Tropical Ecology and Conservation [Monteverde Institute]
Three coffee farms were studied to determine avian feeding guild diversity differences between sun-grown and shade-grown plots in San Luis Valley, Monteverde, Costa Rica. Sun-grown and shade-grown plots were observed on three coffee farms, species were identified by sight, and separated into feeding guilds. Using the Shannon-Weiner Diversity Index, we found a significantly greater overall avian diversity in sun-grown plots (Modified t-test, t= -4.00, df = 267.36). We also found no significant difference in feeding guild diversity between sun-grown and shade-grown plots, but found a significant difference within insectivorous and omnivorous feeding guilds supporting greater diversity in the sun-grown plots …