A5035987113- Lichen and fungal ecology
- Botany and Plant Ecology Studies
- Mycorrhizal Fungi and Plant Interactions
- Plant Water Relations and Carbon Dynamics
- Ecology and Vegetation Dynamics Studies
- Plant and animal studies
- Tree-ring climate responses
- Botany, Ecology, and Taxonomy Studies
- Fern and Epiphyte Biology
- Plant responses to water stress
- Forest Ecology and Biodiversity Studies
- Rangeland and Wildlife Management
- Bryophyte Studies and Records
- Forest ecology and management
- Plant Diversity and Evolution
- Data Quality and Management
- Bayesian Methods and Mixture Models
- Ecology and Conservation Studies
- Horticultural and Viticultural Research
- Fluoride Effects and Removal
- Tree Root and Stability Studies
- Heavy metals in environment
- Geology and Paleoclimatology Research
- Plant Pathogens and Fungal Diseases
- Hydrology and Sediment Transport Processes
Santa Barbara Botanic Garden
2021-2024
International Union for Conservation of Nature
2022
Franklin & Marshall College
2021-2022
University of California, Berkeley
2015-2021
Northern Arizona University
2010-2021
Save the Redwoods League
2018-2019
Uppsala University
2007-2008
University of Plymouth
1997
Fungal species are not immune to the threats facing animals and plants thus also prone extinction. Yet, until 2015, fungi were nearly absent on IUCN Red List. Recent efforts identify fungal under threat have significantly increased number of published assessments. The 597 in 2022-1 List update (21 July 2022) basis for first global review extinction risk they face. Nearly 50% assessed threatened, with 10% NT 9% DD. For regions a larger assessments (i.e., Europe, North America, South America),...
We compared the physiology and growth of seedlings originating from different Sequoia sempervirens (D. Don.) Endl. (coast redwood) Sequoiadendron giganteum (Lindl.) Buchh. (giant sequoia) populations subjected to progressive drought followed by a recovery period in controlled greenhouse experiment. Our objective was examine how multiple plant traits interact influence response each species seed population single cycle. measured soil water status, leaf gas exchange, stem embolism control...
A major goal of community genetics is to understand the influence genetic variation within a species on ecological communities. Although well-documented for some organisms, additional research necessary relative and interactive effects genotype environment biodiversity, identify mechanisms through which tree influences communities, connect this emerging field with existing themes in ecology. We employ an underutilized but ecologically significant group epiphytic bark lichens, importance...
This investigation elucidates relationships within the Lecania cyrtella group (Ramalinaceae, lichenized Ascomycota) by employing morphological, anatomical and molecular methods. The morphological studies included eleven species of Lecania, L. cyrtella, cyrtellina, dubitans, erysibe, hutchinsiae, leprosa, madida, prasinoides, sambucina, sordida sylvestris, a key to plus descriptions are provided. new from Pacific Northwest North America, eastern Europe, sordida, described here. known range...
In tall trees, the mechanisms by which foliage maintains sufficient turgor pressure and water content against height-related constraints remain poorly understood. Pressure-volume curves generated from leafy shoots collected crown-wide 12 large Sequoiadendron giganteum (Lindley) J. Buchholz (giant sequoia) trees provided mechanistic insights into how components of potential vary with height in tree over time. The loss point (TLP) decreased at a rate indistinguishable gravitational gradient...
Water stored in tree stems (i.e., trunks and branches) is an important contributor to transpiration that can improve photosynthetic carbon gain reduce the probability of cavitation. However, tall trees, capacity store water may decline with height because chronically low potentials associated gravitational potential gradient. We quantified importance elastic stem storage top 5-6 m large (4.2-5.0 diameter at breast height, 82.1-86.3 tall) Sequoiadendron giganteum (Lindley) J. Buchholz (giant...
Abstract The “hierarchy of factors” hypothesis states that decomposition rates are controlled primarily by climatic, followed biological and soil variables. Tropical montane forests (TMF) globally important ecosystems, yet there have been limited efforts to provide a biome‐scale characterization litter decomposition. We designed common experiment replicated in 23 tropical sites across the Americas, Asia, Africa combined these results with previous study lowland (TLF). Specifically, we...
Vascular epiphytes of tropical montane cloud forests are vulnerable to climate change, particularly as bases elevate and reduce atmospheric inputs the system. However, studies have generally focused on in contiguous forests, with little research being done isolated pasture trees. We investigated water relations pasture-tree at three sites located below above elevation average base Monteverde, Costa Rica.
Genetic variation in foundation tree species can strongly influence communities of trophic-dependent organisms, such as herbivorous insects, pollinators, and mycorrhizal fungi. However, the extent manner which this results unexpected interactions that reach trophic-independent organisms remains poorly understood, even though these are essential to understanding complex ecosystems. In pinyon-juniper woodland at Sunset Crater (Arizona, USA), we studied pinyon (Pinus edulis) were either...
Abstract According to International Union for the Conservation of Nature (IUCN) guidelines, all species must be assessed against criteria during Red Listing process. For organismal groups that are diverse and understudied, assessors face considerable challenges in assembling evidence due difficulty applying definitions key terms used guidelines. Challenges also arise because uncertainty population sizes (Criteria A, C, D) distributions A2/3/4c, B). Lichens, which often small, difficult...
Chaenotheca longispora is described as a new species from the central coast of California, U.S.A. It similar in morphology to C. laevigata but distinguished by long (up 25 µm) and spirally ornamented ascospores well chemically PD+ orange K+ yellow reaction thallus. Thus far, has been collected only crowns large redwood (Sequoia sempervirens) trees Armstrong Redwoods State Natural Reserve, where it occurs on thick, fibrous bark trunks. A key North America, including longispora, provided.
Abstract: A new species, Lecania belgica , is described and illustrated. It a saxicolous lichen known only from the type locality in Belgium. characterized by apothecia with pruinose, irregularly undulating discs, relatively short ascospores, having 12–16 spores asci. was found on mortar together Diplotomma alboatrum .
Xylopsora canopeorum Timdal, Reese Næsborg & Bendiksby is described as a new species occupying the crowns of large Sequoia sempervirens trees in California, USA. The supported by morphology, anatomy, secondary chemistry and DNA sequence data. While similar external appearance to X. friesii, it distinguished forming smaller, partly coralloid squamules, occurrence soralia and, some specimens, presence thamnolic acid addition friesiic thallus. Molecular phylogenetic results are based on...
Books reviewed include: Field guides—The essential guide to Rocky Mountain mushrooms (Cripps, Evenson & Kuo 2016); Lichens—Keys lichens of North America (Brodo 2016).