Treesearch

The genus Tylopilus s. str. in the Dominican Republic is investigated. Tylopilus griseiolivaceus is introduced as a novel species based on material recorded in a neotropical montane pine woodland but also known to occur in temperate coniferous forests in southeastern USA. The Central American species T. leucomycelinus is also re-evaluated and its geographical range expanded. A detailed morphological description is provided for both species and accompanied by colour images of fresh basidiomes in habitat, line drawings of the main anatomical features and molecular support relying on a...

Numerous studies have shown that the genetic diversity of species inhabiting temperate regions has been shaped by changes in their distributions during the Quaternary climatic oscillations. For some species, the genetic distinctness of isolated populations is maintained during secondary contact, while for others, admixture is frequently observed. For the winter moth (Operophtera brumata), an important defoliator of oak forests across Europe and northern Africa, we previously determined that contemporary populations correspond to genetic diversity obtained during the last glacial maximum...

The Mill Fire, which burned in north-western California during the summer of 2012, provided a unique research opportunity when firefighters implemented a backfiring operation to limit wildfire growth. This backfire was ignited and burned through research plots from a long-term study designed to determine the effects of tree density manipulation and shrub control on the growth and stand development of a ponderosa pine plantation. The objectives of this study were to examine the response of these 53-year-old trees to the backfire and to determine how the fire effects differed with plantation...

Increasing disturbance events (forest fires, windstorms, pest outbreaks) associated with climate change are creating new ecological restoration challenges. Here, we examine the utility of assisted migration in combination with naturally established nurse plants in order to improve the success of afforestation with Abies religiosa (sacred fir), the overwintering host of the Monarch butterfly (Danaus plexippus). We established high-elevation assisted migration A. religiosa provenance field tests at two sites (Las Palomas and Los Ailes) in the core overwintering areas of the Monarch Butterfly...

We used in situ exposures of juvenile mussels (96-d average, May–September) to investigate the causes of mussel declines. We measured survival and growth of mussels exposed to ambient conditions in 23 streams in Kentucky, USA. Our set of streams included both those that support diverse mussel assemblages (occupied streams) and those that have lost nearly their entire mussel fauna (defaunated streams). We used 2 types of enclosures in each stream: silos, which primarily expose mussels to water, and sediment cages, which provide greater exposure to sediments. We used both enclosure types...

The papers in this Special Feature are the result of an unprecedented collaboration between the wetland and forestry communities, with the goal of fostering open dialogue regarding the interaction between forestry operations and forested wetlands in the Coastal Plain of the southeast U.S. Many misunderstandings exist between these two communities. These misunderstanding are partially caused by a lack of dialogue and the use of varying definitions for commonly-used terms, such as "loss" and "forested," but are magnified by an incomplete understanding of fundamental biophysical processes...

National forest law enforcement officers regularly encounter “nonrecreational” campers whose tenure exceeds established stay limits (generally 2 weeks). Some long-term occupants are homeless and seek use of the forest as a temporary or long-term residence. Long-term nonrecreational campers present myriad concerns for forest officials, who seek to balance public access and resource conservation. In addition to biophysical impacts because of waste, disposal of chemicals, soil compaction, and damage to vegetation, nonrecreational campers can alter the social environment being shared with...

We tested the effects of phosphorus (P) fertilization and soil water on the growth, physiology, and total nitrogen (N) accumulation in N-fixing Scotch broom in Olympia, WA. We manipulated soil water and P availability via irrigation and fertilization, respectively, in a completely randomized 2 x 2 factorial on potted one-year old Scotch broom seedlings (n = 20) in an N-deficient sand. There was substantial evidence that increased-irrigation and P-fertilization had similar positive effects on N accumulation in Scotch broom approximately equally. High-irrigation rates were more often...

Forest Inventory and Analysis (FIA) data are useful for a wide range of applications (Shaw 2017), including research, National Forest planning, and private consultation. For some of these applications, FIA data are the primary source of input for projections done using the Forest Vegetation Simulator (FVS; Dixon 2002). For the past several years, there has been a barrier to full use of FIA data in FVS, because of rapid changes in the FIA database (FIADB) and difficulty maintaining a translation process that correctly and comprehensively produces FVS-ready tables from FIADB. In addition,...

In 2012, the US Forest Service promulgated new regulations for land-management planning that emphasize the importance of scientifically credible assessment and monitoring strategies for adaptive forest planning and the maintenance or restoration of ecological integrity. However, in an era of declining budgets, the implementation of robust assessment and monitoring strategies represents a significant challenge for fulfilling the intent of the new planning rule. In this article, we explore opportunities for using data and products produced by the USDA Forest Service’s Forest Inventory and...