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Keyword: herbivory

Regaining the history of deer populations and densities in the southeastern United States

Publications Posted on: October 28, 2020
Despite widespread interest in white‐tailed deer (Odocoileus virginianus) in the southeastern United States, historical deer populations and densities have not been compiled into one accessible source. We digitized maps from 1950, 1970, 1982, and 2003 and reviewed literature to quantify population sizes and densities in the Southeast, although previous estimates may not be accurate. Deer population sizes declined to a minimum of

Pollinators of the Great Plains: Disturbances, stressors, management, and research needs

Publications Posted on: September 28, 2020
Recent global declines of pollinator populations have highlighted the importance of pollinators, which are undervalued despite essential contributions to ecosystem services. To identify critical knowledge gaps about pollinators, we describe the state of knowledge about responses of pollinators and their foraging and nesting resources to historical natural disturbances and new stressors in Great Plains grasslands and riparian ecosystems.

Rapid digitization to reclaim thematic maps of white-tailed deer density from 1982 and 2003 in the conterminous US

Publications Posted on: June 10, 2020
Despite availability of valuable ecological data in published thematic maps, manual methods to transfer published maps to a more accessible digital format are time-intensive. Application of object-based image analysis makes digitization faster.

The life history of Dasypyga alternosquamella Ragonot (Pyralidae) feeding on the Southwestern dwarf mistletoe (Arceuthobium vaginatum) in Colorado

Publications Posted on: December 23, 2019
The immature stages, feeding and oviposition behaviors, patterns of larval abundance, and associated arthropod fauna of Dasypyga alternosquarnella Ragonot (Pyralidae) on Arceuthobiurn vaginatum susp. cryptopodum (Hawks.), the Southwestern dwarf mistletoe, are described and illustrated. The study was conducted at the Manitou Experimental Forest, U.S.D.A.

Does white-tailed deer density affect tree stocking in forests of the eastern United States?

Publications Posted on: August 19, 2019
Background: White-tailed deer (Odocoileus virginianus) have increased during the past century in the USA. Greater deer densities may reduce tree regeneration, leading to forests that are understocked, where growing space is not filled completely by trees. Despite deer pressure, a major transition in eastern forests has resulted in increased tree densities.

Fire and fuel treatments increase tree resistance to bark beetles

Science Spotlights Posted on: April 10, 2018
The frequency of fire in low-elevation coniferous forests in western North America has greatly declined since the late 1800s. In many areas, this has increased tree density, increased the proportion of shade-tolerant species, reduced resource availability, and increased forest susceptibility to forest insect pests and high-severity wildfire. This study investigated how low-intensity fire affects tree defenses and whether fuel treatments impact resistance to a mountain pine beetle outbreak.

The tortoise and the hare: Can the slow native plant win?

Science Spotlights Posted on: May 03, 2017
It has been suggested that exotic plants will be more successful than native plant species as a result of climate change. This is because exotics often exhibit stronger responses to disturbance, faster growth rates, and greater plasticity. In this study, we show that climate change can actually shift the balance in favor of natives when it creates conditions that favor the slower more "tortoise-like" strategies of some natives.

The tortoise and the hare: Reducing resource availability shifts competitive balance between plant species

Publications Posted on: April 14, 2017
Determining how changes in abiotic conditions influence community interactions is a fundamental challenge in ecology. Meeting this challenge is increasingly imperative in the Anthropocene where climate change and exotic species introductions alter abiotic context and biotic composition to reshuffle natural systems.

Aboveground vertebrate and invertebrate herbivore impacts on net N mineralization in subalpine grasslands

Publications Posted on: August 18, 2016
Aboveground herbivores have strong effects on grassland nitrogen (N) cycling. They can accelerate or slow down soil net N mineralization depending on ecosystem productivity and grazing intensity. Yet, most studies only consider either ungulates or invertebrate herbivores, but not the combined effect of several functionally different vertebrate and invertebrate herbivore species or guilds.

Aspen response to management

Science Spotlights Posted on: July 26, 2016
There is considerable interest in the growth and mortality of quaking aspen in the western United States. Looking at the past 10 years of silvicultural treatments to promote aspen regeneration we quantified the factors most influential on subsequent reproduction. Herbivory pressure (domestic and native ungulates) and the presence of advance reproduction best predicted aspen regeneration response.