David Dickey

Individual and environmental risk factors associated with fecal glucocorticoid metabolite concentrations in zoo-housed Asian and African elephants

PLoS ONE · 2019-09-04 · 43 citations

A recent large-scale welfare study in North America involving 106 Asian (Elephas maximus) and 131 African (Loxodonta africana) elephants at 64 accredited facilities identified links (i.e., risk factors) between zoo environmental factors and a number of welfare outcomes (stereotypic behavior, ovarian acyclicity, hyperprolactinemia, walking and recumbence, body condition, health status, serum cortisol). For this population of elephants, we used the same epidemiological methods to examine associati…

Establishing the relationship of soil nitrogen immobilization to cereal rye residues in a mulched system

Plant and Soil · 2018-03-12 · 43 citations

Soil nitrogen (N) immobilization from cover crop residues may help suppress weeds. We established a gradient of cereal rye shoot biomass to determine the extent that soil N can be immobilized and its effect on redroot pigweed (Amaranthus retroflexus L.). A microplot study was conducted in no-till cereal rye (Secale cereale L.)—soybean (Glycine max L. (Merr.)) systems at two sites in eastern USA. Microplots received 0, 2000, 5000, 8000, 12,000 or 15,000 kg ha−1 of cereal rye shoot biomass, and we…

Classic indicators and diel dissolved oxygen versus trend analysis in assessing eutrophication of potable‐water reservoirs

Ecological Applications · 2022 · 23 citations

, decreasing TN:TP ratios) suggest that water quality degradation from eutrophication has worsened over time. These findings support broadly applicable recommendations to strengthen protection of potable source-water reservoirs in urbanizing watersheds: (1) protective numeric water quality criteria are needed for TOC as well as TN, TP, and chl a; (2) continuous diel data capture more realistic DO conditions than traditional sampling, and can provide important insights for water treatment manager…

RNA-Seq study reveals genetic responses of diverse wild soybean accessions to increased ozone levels

BMC Genomics · 2017-06-29 · 23 citations

BACKGROUND: Ozone is an air pollutant widely known to cause a decrease in productivity in many plant species, including soybean (Glycine max (L.) Merr). While the response of cultivated soybean to ozone has been studied, very little information is available regarding the ozone response of its wild relatives. RESULTS: Ozone-resistant wild soybean accessions were identified by measuring the response of a genetically diverse group of 66 wild soybean (Glycine soja Zucc. and Sieb.) accessions to elev…

Recency Effect in College Student Course Evaluations

2020-03-09 · 13 citations

Universities depend on faculty evaluations to substantiate tenure and promotion decisions and it is well known that student ratings are a critical source of information for this process. Of recent concern in course evaluations is recency effect, a rating error that occurs when more weight is assigned to activities that are closer to the time of formal appraisal. Quantitative procedures used in this study revealed that students who were either trained in recency effect and kept a course diary or…