Treesearch

The use of spring prescribed fires to reduce accumulated fuel loads in western forests and facilitate the return of natural fire regimes is a controversial topic. While spring burns can be effective at reducing fuel loads and restoring heterogeneous landscapes, concerns exist over the potential impacts of unnaturally-timed fires to native species. To protect native wildlife from disturbance during critical periods, limited operating periods (LOPs) are often implemented. However when LOPs for multiple species are combined into an integrated management plan, very few time windows for...

Loss of habitat to urbanization is a primary cause of population declines as human-dominated landscapes expand at increasing rates. Understanding how the relative effects of different conservation strategies is important to slow population declines for species in urban landscapes. We studied the wood thrush Hylocichla mustelina, a declining forest-breeding Neotropical migratory species, and umbrella species for forest-breeding songbirds, within the urbanized mid-Atlantic United States. We integrated 40 years of demographic data with contemporary metapopulation model simulations of breeding...

This study documented the current status of wood pallet repair in the United States by identifying the types of processing and equipment usage in repair operations from an automation prespective. The wood pallet repair firms included in the sudy received an average of approximately 1.28 million cores (i.e., used pallets) for recovery in 2012. A majority of the cores received were stringer-style pallets. The most common pallet size received and repaired was 48 x 40 inch. The most commonly used stringer repair method was the application of companion stringers. It was found that most firms...

Ethanol and hexane mixture agent microwave-assisted extraction (MAE) method was conducted to extract peony (Paeonia suffruticosa Andr.) seed oil (PSO). The aim of the study was to optimise the extraction for both yield and energy consumption in mixture agent MAE. The highest oil yield (34.49%) and lowest unit energy consumption (14 125.4 J g -1) were obtained under optimum extraction condition: solid-liquid ratio 0.37 g mL -1, extraction time 3.72 min, extraction temperature 80.92 °C, ethanol ratio 20.00%. GC–MS results showed that unsaturated fatty acids (UFAs) accounted for 88.60% of...

The Bambusoideae subfamily includes the fastest-growing plants worldwide, as a consequence of fast internode elongation. However, few studies have evaluated the temporal and spatial distribution of endogenous hormones during internode elongation. In this paper, endogenous indole-3-acetic acid (IAA) and abscisic acid (ABA) were detected in different developmental internodes during shoot elongation by immunolocalization. Immunohistochemistry showed that IAA was mainly present in the shoot apex, leaf sheath primordia, parenchymal cells, and vascular tissues. During internode elongation and...

As of today, the functions of fusoid cell, and the transport and loading pathways of photoassimilate in bamboo leaves are still not clear. In this paper, the leaves of Fargesia yunnanensis from a greenhouse and the wild were respectively used as samples to analyze the anatomical characteristics of fusoid cells and vascular bundles. The results showed that the bamboo leaves from greenhouse got shorter and thinner with fewer layers of palisade parenchyma cells than those from the wild. The volumes of fusoid cells were also increased. Fusoid cells originated from a huge parenchyma cell as...

In this penultimate chapter, we examine new perspectives on ecology of Golden-winged Warblers (Vermivora chrysoptera), review primary population- level threats, and offer conservation recommendations. Adequate forest cover and patchlevel habitat configuration are important for successful reproduction and to buffer against negative interactions with Blue-winged Warblers (V. cyanoptera). We recommend landscape-scale forest cover of 50%–100% and meso-scale (500-m radius) habitat designs that provide nesting habitat bounded by a mosaic of structurally diverse, multiple age-class forest or...

Anecdotal reports and more recent quantitative findings suggest Golden-winged Warblers (Vermivora chrysoptera) are most abundant in midelevation moist forests of Central America during the nonbreeding season. The species appears to be tolerant of moderate levels of disturbance, inhabiting both primary and secondary forest; however, occupation of agricultural cover types such as shade coffee may be contingent on the presence of adjacent forest. Trends in deforestation in Latin America offer discouraging prospects for the future of habitat for Goldenwinged Warblers in the region in the short...

Question: Herbaceous plant communities in hardwood forests are important for maintaining biodiversity and associated ecosystem services, such as nutrient storage. Are there differences in herbaceous layer nutrient storage for urban park and state preserve forests, and is there seasonal variation? Location: United States, Midwestern region (Iowa). Methods: We examined the herbaceous layer in three 20-m2 plots at six forest sites, in urban parks (city parks with high human visitation) and state preserves (under permanent protection as state preserves). We harvested herbaceous plants from...

Considerable advances have been made in knowledge about Golden-winged Warblers (Vermivora chrysoptera) in the past decade. Recent employment of molecular analysis, stable-isotope analysis, telemetry-based monitoring of survival and behavior, and spatially explicit modeling techniques have added to, and revised, an already broad base of published knowledge. Here, we synthesize findings primarily from recent peerreviewed literature on Golden-winged Warblers, from this volume and elsewhere, and we identify some of the substantial remaining research needs. We have organized this synthesis by...