Treesearch

Green ash (Fraxinus pennsylvanica) is the most widely distributed ash tree in North America. Once common, it has experienced high mortality from the non-native invasive emerald ash borer (EAB; Agrilus planipennis). A small percentage of native green ash trees that remain healthy in long-infested areas, termed "lingering ash," display partial resistance to the insect, indicating that breeding and propagating populations with higher resistance to EAB may be possible. To assist in ash breeding, ecology and evolution studies, we report the first chromosome-level assembly from the genus...

Background: People caring for urban green infrastructure, not least urban trees, play an important role in maintaining the quality of the urban environment. But what happens when information processing and knowledge generation become digitalized? This study examines digital tools developed to provide knowledge support and with ambitions of inciting stewardship. It asks what understanding they draw on, what information they broker, and how they approach uptake and use of the content they provide. Methods: We analyzed 6 different e-tools within the context of urban green infrastructure in...

The Sirex woodwasp Sirex noctilio Fabricius (Hymenoptera: Siricidae), a widespread invasive pest of pines in the Southern Hemisphere, was first detected in North America in 2004. This study assessed the impacts of life history traits, host resistance and species interactions on the demography of S. noctilio in New York, Pennsylvania and Vermont, then compared key metrics to those found in the native range in Galicia, Spain. Many trees naturally attacked by S. noctilio in North America produced no adult woodwasps, with 5 of 38 infested trees (13%) sampled across six sites yielding 64% of...

Patterns of species’ occurrences across space and time are fundamental components to understanding their ecology, as this variation often reflects responses to local environmental gradients. We built species-specific models to understand the spatial and temporal factors predicting captures and activity of five snake species in upland pine forests: copperhead (Agkistrodon contortrix), racer (Coluber constrictor), coachwhip (Masticophis flagellum), western ratsnake (Pantherophis obsoletus), and western ribbonsnake (Thamnophis proximus). From mid-May to mid-July across 3 y (2018, 2019, 2020),...

Forest disturbances play a critical role in ecosystem dynamics. However, the methods for quantifying these disturbances at broad scales may underestimate disturbances that affect individual trees. Utilizing individual tree variables may provide early disturbance detection that directly affects tree demographics and forest dynamics. The goals of this study were to (1) describe different methods for quantifying disturbances at individual tree and condition-level scales, (2) compare the differences between disturbance variables, and (3) provide a methodology for selecting an appropriate...

In the bio-based economy, conversion of biomass to biofuels and other products is essential for developing a sustainable alternative to fossil fuels. For this to become a reality, understanding of the biomass ultrastructure is critically important. For instance, to enhance the yield of fermentable sugars from enzymatic hydrolysis of cellulose, the understanding of the latter’s supramolecular structure and the ability to modify it appropriately is essential. Although cellulose crystallinity is one way to define the aggregated structure, previous research has shown that merely studying how...

Protected areas are essential to conserving biodiversity, yet changing climatic conditions challenge their efficacy. For example, novel and disappearing climates within the protected area network indicate that extant species may not have suitable climate in protected areas in the future. Further, potential transboundary range shifts, those that involve movement from one country to another, are also challenging because physical (e.g. fencing) and non-physical barriers (e.g. contrasting conservation policies) may impede climate-induced movements. Through the lens of climate analogs, we...

Research has demonstrated that residential yards can provide important habitat for urban birds, pollinators, and other wildlife. In addition, the motivations and constraints underlying decisions to manage traditional lawns, water-conserving yards, native plants, and other landscape types are well understood. Yet relatively little research has addressed people's decisions to adopt wildlife-supporting yards. Analyzing survey data from six U.S. cities, we address three related questions: 1) to what extent do residents choose yard features that support wildlife habitat?; 2) how do yard...

Emerald ash borer (Agrilus planipennis; EAB) has devastated populations of ash (Fraxinus spp.) trees in dozens of U.S. states and Canada over the past few decades. The continued survival of scattered ash trees known as "lingering ash" in heavily infested natural stands, however, offers evidence of genetic resistance or tolerance to EAB. These surviving or "lingering" ash individuals may form the basis for reforestation programs in EAB-impacted areas, and clonal mass-propagation of these genotypes can help accelerate these efforts. Between 2013 and 2018, we initiated embryogenic cultures by...

Background: As vacant lot inventories expand in cities across the U.S., vacant land management organizations require strategies that optimize their functioning while ensuring community benefit. Resident engagement in programs to green vacant land may be one helpful strategy. While resident engagement is often required for vacant land management organizations, few researchers have examined how these organizations engage residents and the effect of these practices on their functioning. We hypothesized that more intensive engagement such as involving residents in planning and implementing...