Treesearch

American chestnut (Castanea dentata Borkh.) was a dominant tree species in its native range in eastern North America until the accidentally introduced fungus Cryphonectria parasitica (Murr.) Barr, that causes chestnut blight, led to a collapse of the species. Different approaches (e.g., genetic engineering or conventional breeding) are being used to fight against chestnut blight and to reintroduce the species with resistant planting stock. Because of large climatic differences within the distribution area of American chestnut, successful reintroduction of the species requires knowledge and...

An analysis of the urban forest in New York, New York, reveals that this city has an estimated 7.0 million trees (encompassing all woody plants greater than one-inch diameter at breast height [d.b.h.]) with tree canopy that covers 21 percent of the city. The most common tree species across public and private land are Norway maple, northern white-cedar, tree-ofheaven, sassafras, and white oak, but the most dominant species in terms of leaf area are Norway maple, London planetree, black locust, pin oak, and red maple. Trees in New York City currently store about 1.2 million tons of carbon...

In this paper, we propose that spiritual approaches rooted in the practice of Hawai‘i ritual provide a powerful portal to revealing, supporting, and enhancing our collective aloha (love, fondness, reciprocity, as with a family member) for and dedication to the places and processes that we steward. We provide a case study from Hawai‘i, where we, a group of conservation professionals known as Hālau ‘Ōhi’a, have begun to foster a collective resurgence of sacred commitment to the places and processes we steward through remembering and manifesting genealogical relationships to our landscapes...

The Sky Islands of southeastern Arizona, which consist of separate mountain ranges within a desert matrix, are a unique biodiversity hotspot hosting many neotropical bird species that cannot be seen anywhere else in the United States. Residents of this region depend on ecotourism for their livelihood and there is an above-average concentration of citizens skilled at identifying birds by sight and sound. After the Horseshoe Two wildfire in 2011 burned a large portion of the Chiricahua range, the local residents approached RMRS with concerns about effects on the bird populations. RMRS...

Cogongrass (Imperata cylindrica (L.) Beauv.) is a Southeast Asian warm-season perennial grass species that has spread to all continents except Antarctica. It is considered among the worst problematic weeds on a global scale. Control of cogongrass is difficult, especially in forests. This 6-page fact sheet written by Patrick J. Minogue, Brent V. Brodbeck, and James H. Miller and published by the UF/IFAS School of Forest Resources and Conservation presents recommendations for control strategies that will work in mixed pine-hardwood forests and pine forests. http://edis.ifas.ufl.edu/fr411

Over the last decade, considerable progress has been made in developing vulnerability assessment tools and in applying these methodologies to identify and implement climate change adaptation approaches for forest ecosystems and forest management organizations in Canada and the United States. However, given that adaptation processes are in early stages, evaluation of approaches across agency, organizational, and geographic boundaries is critical. Thus, we conducted a qualitative comparison of three conceptual frameworks for climate change vulnerability assessment and adaptation efforts in...

Tripyrrole molecules have received renewed attention due to reports of numerous biological activities, including antifungal, antibacterial, antiprotozoal, antimalarial, immunosuppressive, and anticancer activities. In a screen of bacterial strains with known toxicities to termites, a red pigment-producing strain, HDZK-BYSB107, was isolated from Chamaecyparis lawsoniana, which grows in Oregon, USA. Strain HDZK-BYSB107 was identified as Serratia marcescens subsp. lawsoniana. The red pigment was identified as prodigiosin using ultraviolet absorption, LC-MS, and 1H-NMR spectroscopy. The...

Wind is a common canopy disturbance in the upland oak (Quercus)- and hickory (Carya)- dominated stands of the Central Hardwood Region of the eastern US. Canopy openings range from small gaps, resulting from windthrow of single dominant trees, to occasional large gaps of many hectares formed by straight-line winds associated with severe thunderstorms and rare subtropical hurricanes. Vegetation regeneration response in small gaps and larger artificially created (i.e., timber harvested) gaps has been extensively studied, but little has been reported on naturally formed large gaps (> 6 trees)...

Phenological synchrony can promote population growth in species with positive density dependence. Variation among life stages in the thermal thresholds for development can foster phenological synchrony under thermal regimes that include frequent occurrence of temperatures between developmental thresholds. The southern pine beetle is an insect with positive density dependence that has recently undergone important shifts in population abundance at the northern extremes of their distribution. We evaluated the hypothesis that cooler winter temperatures in their northern range cause a convergenc...