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Full-Text Articles in Life Sciences

Fire Induced Reproductive Mechanisms Of A Symphoricarpos (Caprifoliaceae) Shrub After Dormant Season Burning, John Derek Scasta, David M. Engle, Ryan N. Harr, Diane M. Debinski Dec 2014

Fire Induced Reproductive Mechanisms Of A Symphoricarpos (Caprifoliaceae) Shrub After Dormant Season Burning, John Derek Scasta, David M. Engle, Ryan N. Harr, Diane M. Debinski

Ecology, Evolution and Organismal Biology Publications

Background: Symphoricarpos, a genus of the Caprifoliaceae family, consists of about 15 species of clonal deciduous shrubs in North America and 1 species endemic to China. In North American tallgrass prairie, Symphoricarpos orbiculatus (buckbrush) is the dominant shrub often forming large colonies via sexual and asexual reproductive mechanisms. Symphoricarpos shrubs, in particular S. orbiculatus, use a unique sexual reproductive mechanism known as layering where vertical stems droop and the tips root upon contact with the soil. Because of conflicting societal values of S. orbiculatus for conservation and agriculture and the current attempt to restore historical fire regimes, there is a ...


Aboveground Tree Growth Varies With Belowground Carbon Allocation In A Tropical Rainforest Environment, James W. Raich, Deborah A. Clark, Litgard Schwendenmann, Tana E. Wood Jun 2014

Aboveground Tree Growth Varies With Belowground Carbon Allocation In A Tropical Rainforest Environment, James W. Raich, Deborah A. Clark, Litgard Schwendenmann, Tana E. Wood

Ecology, Evolution and Organismal Biology Publications

Young secondary forests and plantations in the moist tropics often have rapid rates of biomass accumulation and thus sequester large amounts of carbon. Here, we compare results from mature forest and nearby 15–20 year old tree plantations in lowland Costa Rica to evaluate differences in allocation of carbon to aboveground production and root systems. We found that the tree plantations, which had fully developed, closed canopies, allocated more carbon belowground - to their root systems - than did mature forest. This increase in belowground carbon allocation correlated significantly with aboveground tree growth but not with canopy production (i.e., leaf fall ...


Connecting Soil Organic Carbon And Root Biomass With Land-Use And Vegetation In Temperate Grassland, Devan Allen Mcgranahan, Aaron Lee Daigh, Jessica J. Veenstra, David M. Engle, James R. Miller, Diane M. Debinski Jan 2014

Connecting Soil Organic Carbon And Root Biomass With Land-Use And Vegetation In Temperate Grassland, Devan Allen Mcgranahan, Aaron Lee Daigh, Jessica J. Veenstra, David M. Engle, James R. Miller, Diane M. Debinski

Ecology, Evolution and Organismal Biology Publications

Soils containmuch of Earth’s terrestrial organic carbon but are sensitive to land-use. Rangelands are important to carbon dynamics and are among ecosystems most widely impacted by land-use. While common practices like grazing, fire, and tillage affect soil properties directly related to soil carbon dynamics, their magnitude and direction of change vary among ecosystems and with intensity of disturbance. We describe variability in soil organic carbon (SOC) and root biomass—sampled from 0–170 cm and 0– 100 cm, respectively—in terms of soil properties, land-use history, current management, and plant community composition using linear regression and multivariate ordination. Despite ...


Immobile And Mobile Life-History Stages Have Different Thermal Physiologies In A Lizard, Rory S. Telemeco Jan 2014

Immobile And Mobile Life-History Stages Have Different Thermal Physiologies In A Lizard, Rory S. Telemeco

Ecology, Evolution and Organismal Biology Publications

Temperature affects multiple aspects of an organism’s biology and thus defines a major axis of the fundamental niche. For ectotherms, variation in the thermal environment is particularly important because most of these taxa have a limited capacity to thermoregulate via metabolic heat production. While temperature affects all life-history stages, stages can differ in their ability to respond to the thermal environment. For example, in oviparous organisms, free-living adults can behaviorally thermoregulate, whereas developing embryos are at the mercy of the nest environment. These differences in the realized thermal environment should select for life-history stages to have different thermal tolerances ...


Landowners' Perceptions Of Risk In Grassland Management: Woody Plant Encroachment And Prescribed Fire, Ryan N. Harr, Lois Wright Morton, Shannon R. Rusk, David M. Engle, James R. Miller, Diane M. Debinski Jan 2014

Landowners' Perceptions Of Risk In Grassland Management: Woody Plant Encroachment And Prescribed Fire, Ryan N. Harr, Lois Wright Morton, Shannon R. Rusk, David M. Engle, James R. Miller, Diane M. Debinski

Ecology, Evolution and Organismal Biology Publications

Ecologists recognize that fire and herbivory are essential to maintaining habitat quality in grassland ecosystems. Prescribed fire and grazing are typically used on public reserves to increase biodiversity, improve grassland productivity, and control encroachment of woody plants. However, these tools, particularly prescribed fire, have not been widely adopted by private landowners. Fire suppression and prescribed fire are strategies that present competing risks to owners who make management decisions. We explore landowner perceptions of risk associated with (1) eastern redcedar (Juniperus virginiana) encroachment, and (2) the use of prescribed fire to control woody species in the Grand River Grasslands of Iowa ...