Treesearch

Zones where urban land covers meet wildland areas have become a critical point of interaction between human settlements and natural ecosystems at risk of wildfire. These zones span diverse socioeconomic, governance, and ecological dimensions that are often not accounted for with frequently used methodologies. We developed and mapped a tri-dimensional Pyro-Socio-Ecological Zone (PSEZ) framework based on a suite of composite indicators that account for disparate Ecological, Socioeconomic, and Governance contexts in southern Italy (IT) and southern California (CA), USA. In CA, PSEZ with high...

Le présent rapport fournit des protocoles détaillés pour la collecte de données sur la surveillance des arbres urbains. Nous abordons notamment les variables essentielles pour les projets de surveillance sur le terrain, plus précisément l’identification de l’équipe de terrain, le niveau d’expérience de l’équipe de terrain, l’identifiant de l’arbre, l’emplacement, le type de site, l’utilisation des terres, l’espèce, l’état de mortalité, la vigueur de la cime et le diamètre du tronc. Ce guide de terrain est destiné aux aménagistes des forêts urbaines et aux chercheurs qui collectent des...

Les lignes directrices proposées dans le document Surveillance des arbres urbains : guide des ressources (ci-après dénommé le Guide des ressources) ont été élaborées et peaufinées au cours de nombreuses années pour répondre au besoin de protocoles normalisés de surveillance des arbres urbains. Le Guide des ressources fournit des conseils détaillés aux aménagistes de forêts urbaines et aux chercheurs qui souhaitent concevoir et mettre en oeuvre un projet de surveillance des arbres. Le présent Guide des ressources est un document d’accompagnement du document intitulé Surveillance des arbres...

Animal migration remains poorly understood for many organisms, impeding understanding of movement dynamics and limiting conservation actions. We develop a framework that scales from movements of individuals to the dynamics of continental migration using data synthesis of endogenous markers, which we apply to three North American bat species with unexplained high rates of fatalities at wind energy facilities. The two species experiencing the highest fatality rates exhibit a “pell‐mell” migration strategy in which individuals move from summer habitats in multiple directions, both to higher...

Background: Conventional volunteer pools can generate labor for citizen science activities, but opportunities also exist to involve and incorporate student populations into meaningful data collection exercises and service learning initiatives. This is especially relevant in urban and community forestry, where land managers are charged with maintaining inventory records of tree populations in order to inform management and policy decisions but often operate without adequate capacity to maintain high quality and updated data. Previous research has shown that trained undergraduate students...

Forest thinning treatments are expanding in scope and scale to counter increasing wildfire risk. Such treatments are being applied in aquatic-adjacent forests that provide a critical habitat for sensitive amphibians, yet little is known about the impact of these treatments. We used a 5-year (2017–2021) before–after–control–impact experiment to investigate the effects of hand-thinning on pond-breeding amphibian activity around an ephemeral lake in the southern Cascade Range of California. We found that hand-thinning had no detectable negative effects on long-toed salamanders (Ambystoma...

As wolf and grizzly bear populations recover across the American West, livestock producers face renewed challenges of coexistence, prompting increased interest in nonlethal conflict mitigation strategies. One such tool – range riding – uses human presence to prevent depredation and monitor livestock. While range riding is gaining traction among conservation practitioners and producers alike, empirical research on its implementation, effectiveness, and sustainability remains limited. This study examines range riding in the context of the “New West,” focusing on three long-standing programs...

Spruce beetle, Dendroctonus rufipennis(Kirby) (Coleoptera: Curculionidae), poses a significant threat to mature spruce (Piceaspp.) in western North America. We evaluated 3-methylcyclohex-2-en-1-one (MCH), the primary anti-aggregation pheromone of D. rufipennis, for tree protection at 3.5 and 7 g MCH/tree (SPLAT MCH, ISCA Inc., Riverside, CA) alone and in combination with acetophenone + (E)-2-hexen-1-ol + (Z)-2-hexen-1ol (PLUS) or with linalool + β-caryophyllene + (Z)-3-hexanol (AKB). Dendroctonus rufipenniscolonization and subsequent mortality of individually treated spruce and of untreated...

Rapid ‘ōhi‘a death (ROD), caused by Ceratocystis lukuohiaand C. huliohia, severely impacts ‘ōhi‘a lehua (Metrosideros polymorpha), a keystone tree species on the Hawaiian Islands. This study examined the ability of these pathogens to colonize ‘ōhi‘a fine roots in a series of root dip experiments under in vitro conditions, focusing on the potential roles of host genetics and root tissue condition in susceptibility. The results showed that both pathogens can colonize and form fruiting bodies on fine roots; however, C. lukuohiahad greater colonization rates and produced more perithecia than...

I compile information on five rare conifer species in the White Mountains: Pinus albicaulis, P. contorta, P. ponderosa, P. jeffreyi, and Juniperus grandis.