A5091773099- Photosynthetic Processes and Mechanisms
- Plant and animal studies
- Plant Water Relations and Carbon Dynamics
- Plant Parasitism and Resistance
- Plant responses to elevated CO2
- Light effects on plants
- Soil Carbon and Nitrogen Dynamics
- Remote Sensing in Agriculture
- Rangeland and Wildlife Management
- Plant Gene Expression Analysis
- Plant Diversity and Evolution
- Coastal wetland ecosystem dynamics
- Adipose Tissue and Metabolism
- Fire effects on ecosystems
- Legume Nitrogen Fixing Symbiosis
- Aquatic Ecosystems and Phytoplankton Dynamics
- Ecology and Vegetation Dynamics Studies
- Amphibian and Reptile Biology
- Urban Heat Island Mitigation
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Turfgrass Adaptation and Management
- Species Distribution and Climate Change
- Isotope Analysis in Ecology
Bowdoin College
2012-2024
Abstract Since 2006, six satellites measuring solar‐induced chlorophyll fluorescence (SIF) have been launched to better constrain terrestrial gross primary productivity (GPP). The promise of the SIF signal as a proxy for photosynthesis with strong relationship GPP has widely cited in carbon cycling studies. However, originates from dynamic energy partitioning at leaf level and does not exhibit uniformly linear finer scales. We induced stomatal closure deciduous woody tree branches measured...
Abstract Evergreen needleleaf forests (ENFs) play a sizable role in the global carbon cycle, but biological and physical controls on ENF cycle feedback loops are poorly understood difficult to measure. To address this challenge, growing appreciation for stress physiology of photosynthesis has inspired emerging techniques designed detect photosynthetic activity with optical signals. This Overview summarizes how fundamental plant biophysical processes control fate photons from leaf globe,...
Infection by eastern dwarf mistletoe (Arceuthobium pusillum) modifies needle and branch morphology hastens white spruce (Picea glauca) mortality. We examined potential causal mechanisms assessed the impacts of infection-induced alterations to host development performance across scales ranging from hormone contents bole expansion. Needles on infected branches (IBs) possessed higher total cytokinin (CK) lower abscisic acid than needles uninfected (UBs). IBs exhibited greater xylem growth...
Abstract Cities are taking the lead on climate change mitigation with ambitious goals to reduce carbon dioxide (CO 2 ) emissions. The implementation of effective policies will require accurate measurements guide policy decisions and monitor their efficacy. Here, we present a comprehensive CO inventory an urban temperate forest unmanaged grassland using field observations. We estimate annual storage by vegetation soils place our biogenic flux estimates in context local fossil fuel (FF)...
Eastern dwarf mistletoe (Arceuthobium pusillum Peck) is a hemiparasitic angiosperm that infects white spruce (Picea glauca (Moench) Voss) and red (P. rubens Sarg.) in northeastern North America. The effects of infection differ substantially between spruce, with suffering greater infection-induced mortality. In the present study, we sought to determine role species-specific differences needle-scale responses parasitism may play observed effect on host tree health. Based measurements made,...
When the capacity for photosynthesis is constrained by unfavorable growing conditions, excess absorbed light safely lost from leaves via thermal energy dissipation—a photoprotective mechanism ubiquitous among higher plants. The relatively low irradiance conditions yet stressful environment of arctic tundra suggest contrasting hypotheses regarding necessity plant investment in photoprotection. To examine these hypotheses, pigments xanthophyll cycle were investigated conjunction with...
Eastern dwarf mistletoe (Arceuthobium pusillum Peck) parasitizes the branches of white spruce (Picea glauca [Moench] Voss) and ultimately kills this host species. Previous studies needle physiology generally focused on trees experiencing infections moderate severity; here, we expanded upon previous research to investigate morphological, physiological, biochemical properties needles from full range infection severities. We found that impact parasitism parameters did not scale uniformly with...
Abstract Remote measurements of solar-induced fluorescence (SIF) are now widely used to model gross primary productivity (GPP). However, the ability SIF track GPP in different environments, conditions, and at scales remains uncertain. We designed an experiment measure photosynthesis while inducing plant stress replicated turfgrass. Immediately following application abscisic acid (ABA), treated grasses experienced a 75% decrease 18% decline yield , with evidence alterations energy...
Merrymeeting Bay is a 4330-ha freshwater tidal ecosystem in mid-coast Maine that historically provided important stopover habitat for migrating waterfowl. To better understand substantial decline the number of ducks foraging over past fifty years, we reconstructed history environmental change using oral histories, aerial photography, and field experiments. Our studies revealed profound throughout 20th century likely influenced capacity to support Ironically, unregulated discharge industrial...
The crowns of juvenile Prumnopitys taxifolia (D. Don) de Laub. are comprised thin, interlaced, wiry stems branching at wide angles and bearing sparse, scale-like, clasping leaves (‘divaricating’ shoots) that generally surround oblong, compressed (‘leafy’ shoots). As development proceeds, non-divaricating branches the mature tree form exclusively; thus, P. is profoundly heteroblastic. Divaricating brown in appearance possess very low leaf areas. such, one might assume they perform little...