Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Entire DC Network
Edge Effects On Tropical Bird Nest Predation In Monteverde, Costa Rica, September 1999, Kristin C. Young
Edge Effects On Tropical Bird Nest Predation In Monteverde, Costa Rica, September 1999, Kristin C. Young
Tropical Ecology and Conservation [Monteverde Institute]
Disturbances to continuous forest such as roads or cleared patches of land often cause forest fragmentation. Resulting tracts of forest are often too small to support populations of top predators. As a result of this, mesopredators populations are left unchecked and increase to unnatural abundances. One consequence of this is increased predation on tropical bird nests, which may put them at risk for extinction. I constructed 120 artificial bird nests and placed two quail eggs in each nest. Nests were situated along 12 transect lines that ran into the forest, perpendicular to a road in Monteverde, Costa Rica. Predation was …
Biological Inventory And Local Knowledge In Locating Medicinal Plants, September 1999, Amey Libman
Biological Inventory And Local Knowledge In Locating Medicinal Plants, September 1999, Amey Libman
Tropical Ecology and Conservation [Monteverde Institute]
Plants are an extremely important contributor to many medicines throughout the world. Because of the amount of forest destruction that is occurring, it is becoming important to find a rapid way to assess forests for their potential of having medicinal plants. Two such methods for assessing areas for medicinal plants, chemotaxonomic and ethnopharmacological are discussed in this paper. A biological survey of an area of premontane wet forest in Monteverde, and interviews of local people were done to compare which would better assess possible medicinal plants in the area. The end result indicates that the biological inventory would be the …
Vesicular-Arbuscular Mycorrhizal Fungi Among Different Growth Stages Of Cecropia Polyphlebia (Cecropiaceae), September 1999, Mandi Frerking
Vesicular-Arbuscular Mycorrhizal Fungi Among Different Growth Stages Of Cecropia Polyphlebia (Cecropiaceae), September 1999, Mandi Frerking
Tropical Ecology and Conservation [Monteverde Institute]
Mycorrhizal fungi are important in the survival and growth of most plants, tropical trees in particular. Yet little research has been done on the abundance of mycorrhizae throughout the life span of plants. I collected root samples from 15 seedlings, 15 saplings, and 15 adults of Cecropia polyphlebia in order to determine the variance in abundance of mycorrhizae among the three growth stages. Root samples were stained and scored for vesicular-arbuscular mycorrhizae by comparing the number of infected roots to non-infected roots. Three morphologies of mycorrhizae were observed under examination of stained roots; random, hyphal, and sheathing infection. Two-way ANOVA’s …
Outcrossing Mechanisms In Columnea Microcalyx (Gesneriaceae), September 1999, Alise Baer
Outcrossing Mechanisms In Columnea Microcalyx (Gesneriaceae), September 1999, Alise Baer
Tropical Ecology and Conservation [Monteverde Institute]
Protandry has been known to promote outcrossing in many species of plants (Lloyd & Webb 1986, in Endress 1994), but in asynchronously flowering plants other mechanisms are needed to reinforce outcrossing (Endress 1994). This study investigates the flowering system of Columnea microcalyx (Gesneriaceae) to determine what mechanisms the plant may be using to promote outcrossing. Nectar production, floral characteristics, and the effects of pollination on nectar production were measured in 36 flowers of C. microcalyx. It was found that C. microcalyx flowers are protandrous; they open asynchronously on a plant and have delayed nectar production. It was also found that …