Abstract Background An extreme drought from 2012–2016 and concurrent bark beetle outbreaks in California, USA resulted widespread tree mortality. We followed changes mortality, stand structure, surface canopy fuels over four years after the peak of mortality Sierra mixed conifer pinyon pine ( Pinus monophylla ) forests to examine patterns needle retention death, snag fall across species. then i...

To determine the impact of fertilization and thinning on growth and development of red fir (Abies magnifica A. Murr.) stands, we established an experiment in a 60-year-old stand using a 2 × 3 factorial design with nitrogen-fertilized and nonfertilized treatments and three stocking levels. Plots were established in 1976 and were measured every 5 years for 26 years. The periodic annual increment ...

Progress on two main studies on fungal ectomycorrhizal communities in the Sierra National Forest is discussed. One study examined the short-term effects of ground fire on the ectomycorrhizal community and the other examined the ectomycorrhizal associates of snow plant (Sarcodes sanguinea). In the ground-fire study we found that a large initial reduction in ectomycorrhizal biomass is caused prim...

For many species of long-lived organisms, such as trees, survival appears to be the most critical vital rate affecting population persistence. However, methods commonly used to quantify tree death, such as relating tree mortality risk solely to diameter growth, almost certainly do not account for important spatial processes. Our goal in this study was to detect and, if present, to quantify the ...

This is the third report detailing Ptiliidae collected from forest leaf litter by the Moravian Museum (Brno, Czech Republic) expeditions to Madagascar 2010-2013. After completion of the first draft, which identified 16 new species, more Madagsacan Acrotrichis, collected at earlier dates, were found in the Natural History Museum in London (BMNH). These included 17 unpublished new species determi...

Red fir (Abies magnifica) forests in the Sierra Nevada are known to demonstrate both shade tolerant and disturbance related regeneration making it difficult to understand the role of disturbances in the regeneration dynamics of the forests. Four stands with different structural characteristics were selected for intensive sampling in order to capture the observed range of structural variability ...