Publications by authors named "Darren L Ficklin"

Forests around the world are experiencing changes due to climate variability and human land use. How these changes interact and influence the vulnerability of forests are not well understood. In the eastern United States, well-documented anthropogenic disturbances and land-use decisions, such as logging and fire suppression, have influenced forest species assemblages, leading to a demographic shift from forests dominated by xeric species to those dominated by mesic species.

View Article and Find Full Text PDF
Article Synopsis
  • Citizen science relies heavily on the personal connections that volunteers have with the topic or community, which is often overlooked by scientists who focus on data collection.
  • There are ethical concerns about how researchers may extract data from citizen scientists without offering them meaningful benefits in return.
  • To create more reciprocal relationships, researchers should involve citizen scientists in the research process, utilizing their local expertise to enhance both research quality and societal impacts.
View Article and Find Full Text PDF
Article Synopsis
  • * Rising VPD interacts with soil moisture and drives drought conditions, impacting essential services like carbon capture, biodiversity, and agricultural productivity.
  • * The article reviews how VPD affects ecosystems and suggests management strategies to address these challenges, particularly in relation to water resources, agriculture, and wildfire management.
View Article and Find Full Text PDF

The emergence of billions of periodical cicadas affects plant and animal communities profoundly, yet little is known about cicada impacts on soil carbon fluxes. We investigated the effects of Brood X cicadas (Magicicada septendecim, M. cassinii and M.

View Article and Find Full Text PDF
Article Synopsis
  • Water potential is crucial for the functioning of leaves, roots, and microbes, influencing water movement in ecosystems, but is often not measured in practice.
  • Current data on soil and plant water potential is limited, making it difficult to understand moisture stress impacts and introducing uncertainty into models.
  • The authors propose advancements in sensor technology and data networks to improve monitoring, which could enhance our understanding of ecohydrological processes and decrease modeling uncertainties.
View Article and Find Full Text PDF

Decision-support tools (DSTs) are often produced from collaborations between technical experts and stakeholders to address environmental problems and inform decision making. Studies in the past two decades have provided key insights on the use of DSTs and the importance of bidirectional information flows among technical experts and stakeholders - a process that is variously referred to as co-production, participatory modeling, structured decision making, or simply stakeholder participation. Many of these studies have elicited foundational insights for the broad field of water resources management; however, questions remain on approaches for balancing co-production with uncertainty specifically for watershed modeling decision support tools.

View Article and Find Full Text PDF

Severe droughts can impart long-lasting legacies on forest ecosystems through lagged effects that hinder tree recovery and suppress whole-forest carbon uptake. However, the local climatic and edaphic factors that interact to affect drought legacies in temperate forests remain unknown. Here, we pair a dataset of 143 tree ring chronologies across the mesic forests of the eastern US with historical climate and local soil properties.

View Article and Find Full Text PDF

Changes in climate are driving an intensification of the hydrologic cycle and leading to alterations of natural streamflow regimes. Human disturbances such as dams, land-cover change, and water diversions are thought to obscure climate signals in hydrologic systems. As a result, most studies of changing hydroclimatic conditions are limited to areas with natural streamflow.

View Article and Find Full Text PDF

Characterization of the uncertainty and sensitivity of model parameters is an essential facet of hydrologic modeling. This article introduces the multi-objective evolutionary sensitivity handling algorithm (MOESHA) that combines input parameter uncertainty and sensitivity analyses with a genetic algorithm calibration routine to dynamically sample the parameter space. This novel algorithm serves as an alternative to traditional static space-sampling methods, such as stratified sampling or Latin hypercube sampling.

View Article and Find Full Text PDF

In the Upper Colorado River Basin (UCRB), the principal source of water in the southwestern U.S., demand exceeds supply in most years, and will likely continue to rise.

View Article and Find Full Text PDF

The assessment of hydrologic responses to climate change is required in watershed management and planning to protect water resources and environmental quality. This study is designed to evaluate and enhance watershed modeling approach in characterizing climate change impacts on water supply and ecosystem stressors. Soil and Water Assessment Tool (SWAT) was selected as a base model, and improved for the CO2 dependence of potential evapotranspiration and stream temperature prediction.

View Article and Find Full Text PDF

The Soil and Water Assessment Tool (SWAT) was used to assess the impact of climate change on sediment, nitrate, phosphorus and pesticide (diazinon and chlorpyrifos) runoff in the San Joaquin watershed in California. This study used modeling techniques that include variations of CO(2), temperature, and precipitation to quantify these responses. Precipitation had a greater impact on agricultural runoff compared to changes in either CO(2) concentration or temperature.

View Article and Find Full Text PDF

A PHP Error was encountered

Severity: Notice

Message: fwrite(): Write of 34 bytes failed with errno=28 No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 272

Backtrace:

A PHP Error was encountered

Severity: Warning

Message: session_write_close(): Failed to write session data using user defined save handler. (session.save_path: /var/lib/php/sessions)

Filename: Unknown

Line Number: 0

Backtrace: