scholarly journals A comparative field study of growth and survival of Sierran conifer seedlings

1996 ◽  
Author(s):  
R.A. Kern
Keyword(s):  
Field Study ◽  
Conifer Seedlings ◽  
Growth And Survival

Impact of temperature and nutrient dynamics on growth and survival of Corbicula fluminea : A field study in oligotrophic Lake Constance

2017 ◽  
Vol 102 (1-2) ◽  
pp. 15-28 ◽  
Author(s):  
Timo Basen ◽  
Katja M. Fleckenstein ◽  
Karsten Rinke ◽  
Karl-Otto Rothhaupt ◽  
Dominik Martin-Creuzburg
Keyword(s):  
Field Study ◽  
Nutrient Dynamics ◽  
Corbicula Fluminea ◽  
Oligotrophic Lake ◽  
Lake Constance ◽  
Growth And Survival

Assessing host response to disease treatment: how chytrid-susceptible frogs react to increased water salinity

2017 ◽  
Vol 44 (8) ◽  
pp. 648 ◽  
Author(s):  
Kaya L. Klop-Toker ◽  
Jose W. Valdez ◽  
Michelle P. Stockwell ◽  
Matthew E. Edgar ◽  
Loren Fardell ◽  
...  
Keyword(s):  
Field Study ◽  
Environmental Variables ◽  
Batrachochytrium Dendrobatidis ◽  
Saline Water ◽  
Water Level Fluctuations ◽  
Habitat Manipulation ◽  
Susceptible Host ◽  
Growth And Survival ◽  
Litoria Aurea ◽  
Host Behaviour

Context The severity and prevalence of the amphibian fungal pathogen, Batrachochytrium dendrobatidis (Bd) is correlated with several environmental variables, including salinity, temperature, and moisture content, which influence the pathogen’s growth and survival. Habitats that contain these environmental variables at levels outside of those optimal for Bd growth and survival may facilitate the survival of susceptible host species. Therefore, manipulation of environmental salinity is a potential management strategy to help conserve Bd-susceptible species. However, host behaviour also influences disease dynamics, and the success of habitat manipulation programs depends on how hosts use this altered habitat. Aims To assess if the Bd-susceptible green and golden bell frog, Litoria aurea, will select waterbodies with a salinity increased to S=3; if this selection is affected by infection; and if a frog’s time in a waterbody of this salinity affects infection load or blood physiology. Methods We conducted a filmed choice experiment and a 3-year field study where infected and uninfected frogs could choose between fresh or saline waterbodies. Key results In both the laboratory experiment and field study, Bd-infected L. aurea spent a significantly greater amount of time in or closer to a waterbody than uninfected frogs. Experimentally infected frogs tended to prefer the saline water over fresh, but their choice of water usage did not differ statistically from uninfected frogs. In the field, frogs began to avoid ponds when salinities rose above S=5. Conclusions Because both wild and captive, and infected and uninfected L. aurea readily selected waterbodies with a salinity of S=3, this salinity could potentially be used as a passive method for reducing the severity of Bd when managing this species. However, further testing is needed to understand the efficacy of this treatment, and care must be taken to prevent salinities rising above S=5, because this level seems to produce an avoidance response and therefore may not be suitable in every location. Implications Manipulation of aquatic habitats may be a worthwhile focus for Bd management in habitats where water level fluctuations are minimal.

Juvenile tree growth and demography in response to feral water buffalo in savannas of northern Australia: an experimental field study in Kakadu National Park

2006 ◽  
Vol 54 (3) ◽  
pp. 283 ◽  
Author(s):  
P. A. Werner ◽  
I. D. Cowie ◽  
J. S. Cusack
Keyword(s):  
Field Study ◽  
Tree Growth ◽  
National Park ◽  
Water Buffalo ◽  
Ground Level ◽  
Northern Australia ◽  
Growth And Survival ◽  
Major Mechanism ◽  
Scale Experiment ◽  
Juvenile Plants

Tree populations in the wooded savannas of northern Australia lack a well developed seed bank, but instead rely on a persistent ground layer of suppressed juvenile plants <1 m of indeterminate ages. The feral Asian water buffalo has been implicated as a factor in inhibiting the movement of juvenile trees to sapling stage. In a 6-year field study in Kakadu National Park, 656 juvenile plants were monitored for growth and survival, and in exploring the effects of buffalo, clipping surrounding vegetation and ambient fire. Buffalo were removed from one half of the sites across an environmental gradient in a landscape-scale experiment. Juvenile trees grew more slowly but fewer became dormant where buffalo were absent. Experimental clipping of surrounding vegetation produced significantly increased height at the buffalo-absent sites, but not at the buffalo-present sites, demonstrating that the positive effect of buffalo on growth was indirect, by reducing the competitive regime for juvenile trees. Within 3 years of removal of buffalo, ground-level green biomass increased 2–10 times and litter 1.3–2 times over a topographic gradient. Mortality of juvenile trees was not significantly different between buffalo-present and buffalo-absent sites when plots remained unburnt. By contrast, at buffalo-absent sites, three times more juveniles died after late dry-season fires than at unburnt sites, but there was no difference among buffalo-present sites. Overall, the total juvenile tree bank decreased by 7% where buffalo grazed and by 18% where buffalo had been removed. The study demonstrated a major mechanism(s) responsible for recorded changes in vegetation patterns of these savannas, whereby buffalo initiate a cascade of effects by changing ground-level biomass, which change competitive relationships and fuel loads, which then have an impact on tree growth and demography. The results are discussed with respect to dynamics of the juvenile tree bank and implications for long-term sustainability of these wooded savannas.

Investigating the Unified Motive Scales

2020 ◽  
pp. 1-5
Author(s):  
Martin Bettschart ◽  
Marcel Herrmann ◽  
Benjamin M. Wolf ◽  
Veronika Brandstätter
Keyword(s):  
Field Study ◽  
Predictive Validity ◽  
Selection Process ◽  
Police Department ◽  
Longitudinal Field ◽  
Explicit Motives ◽  
Achievement Motive

Abstract. Explicit motives are well-studied in the field of personality and motivation psychology. However, the statistical overlap of different explicit motive measures is only moderate. As a consequence, the Unified Motive Scales (UMS; Schönbrodt & Gerstenberg, 2012 ) were developed to improve the measurement of explicit motives. The present longitudinal field study examined the predictive validity of the UMS achievement motive subscale. Applicants of a police department ( n = 168, Mage = 25.11, 53 females and 115 males) completed the UMS and their performance in the selection process was assessed. As expected, UMS achievement predicted success in the selection process. The findings provide first evidence for the predictive validity of UMS achievement in an applied setting.

Employees’ Critical Thinking, Leaders’ Inspirational Motivation, and Voice Behavior

2018 ◽  
Vol 17 (1) ◽  
pp. 33-41 ◽  
Author(s):  
Jing Jiang ◽  
Ang Gao ◽  
Baiyin Yang
Keyword(s):  
Critical Thinking ◽  
Field Study ◽  
Voice Behavior ◽  
Research And Practice ◽  
Inspirational Motivation ◽  
Positive Effect

Abstract. This study uses implicit voice theory to examine the influence of employees’ critical thinking and leaders’ inspirational motivation on employees’ voice behavior via voice efficacy. The results of a pretest of 302 employees using critical thinking questionnaires and a field study of 273 dyads of supervisors and their subordinates revealed that both employees’ critical thinking and leaders’ inspirational motivation had a positive effect on employees’ voice and that voice efficacy mediates the relationships among employees’ critical thinking, leaders’ inspirational motivation, and employees’ voice. Implications for research and practice are discussed.

Can Alcohol Intoxication lead to Safer Sex? A Field Study Approach

1999 ◽  
Author(s):  
Tara K. Macdonald ◽  
Mark P. Zanna ◽  
Geoffrey T. Fong ◽  
Alanna M. Martineau
Keyword(s):  
Field Study ◽  
Alcohol Intoxication ◽  
Safer Sex ◽  
Study Approach

Positive and negative self-efficacy effects revisited: A longitudinal field study

2010 ◽  
Author(s):  
Shuhua Sun ◽  
Zhaoli Song ◽  
Vivien Kim Geok Lim ◽  
Don J. Q. Chen ◽  
Xian Li
Keyword(s):  
Field Study ◽  
Self Efficacy ◽  
Longitudinal Field
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