scholarly journals The stress hormone corticosterone in a marine top predator reflects short‐term changes in food availability

2015 ◽  
Vol 5 (6) ◽  
pp. 1306-1317 ◽  
Author(s):  
Robert T. Barrett ◽  
Kjell E. Erikstad ◽  
Hanno Sandvik ◽  
Mari Myksvoll ◽  
Susi Jenni‐Eiermann ◽  
...  
Keyword(s):  
Food Availability ◽  
Stress Hormone ◽  
Top Predator ◽  
Short Term

Short-term effects of hurricane disturbance on food availability for migrant songbirds during autumn stopover

Wetlands ◽  
2009 ◽  
Vol 29 (1) ◽  
pp. 123-134 ◽  
Author(s):  
Robert C. Dobbs ◽  
Wylie C. Barrow ◽  
Clinton W. Jeske ◽  
Jennifer DiMiceli ◽  
Thomas C. Michot ◽  
...  
Keyword(s):  
Food Availability ◽  
Short Term ◽  
Hurricane Disturbance ◽  
Short Term Effects

scholarly journals The Effect of Natural Ocean Sound Exposure and Ocean-Side Relaxation on Chronic Tinnitus Patients: A Pilot Study in Korea

2019 ◽  
pp. 014556131987390
Author(s):  
Kang Hyeon Lim ◽  
Kuk Jin Nam ◽  
Yoon Chan Rah ◽  
Jaehyung Cha ◽  
Sung-Jae Lee ◽  
...  
Keyword(s):  
Serum Cortisol ◽  
Chronic Tinnitus ◽  
Serotonin Level ◽  
Stress Hormone ◽  
Short Term ◽  
Sound Exposure ◽  
Sound Therapy ◽  
Potential Efficacy ◽  
Epinephrine Level

Sound therapy is a treatment modality for tinnitus patients by increasing the background neuronal activity in the auditory system and inducing relative alleviation of the tinnitus. This study was performed to evaluate the efficacy of natural ocean sound exposure and ocean-side relaxation in chronic tinnitus patients. We prospectively enrolled all 18 chronic tinnitus patients (≥6 months) from July to November 2018. All patients completed 90 hours of our programs. The improvement in their subjective tinnitus severity, moods, the quality of life, and sleep was serially assessed using several questionnaires at baseline, immediately, and 1 month after the program. Changes in serum stress hormone levels of the patients were also compared between the baseline and immediately after the program. Average total Tinnitus Handicap Questionnaire score and factor 2 (hearing difficulty related to tinnitus) score significantly improved over time ( P = .024 and P = .002). Patient’s serum cortisol and epinephrine level did not show significant decrease, and serum norepinephrine and serotonin level significantly increased immediately after our program ( P < .001 and P < .001). Natural ocean sound exposure and ocean-side relaxation for short-term period has a potential efficacy on chronic tinnitus patients.

Effects of fire, food availability and vegetation on the distribution of the rodent Bolomys lasiurus in an Amazonian savanna

2004 ◽  
Vol 20 (2) ◽  
pp. 183-187 ◽  
Author(s):  
Viviane Maria Guedes Layme ◽  
Albertina Pimentel Lima ◽  
William Ernest Magnusson
Keyword(s):  
Spatial Variation ◽  
Food Availability ◽  
Significant Relationship ◽  
Habitat Suitability ◽  
Vegetation Cover ◽  
Vegetation Structure ◽  
Short Term ◽  
Tall Grass ◽  
Insect Abundance ◽  
Habitat Suitability Models

We investigated the relative influences of vegetation cover, invertebrate biomass as an index of food availability and the short-term effects of fires on the spatial variation in densities of the rodent Bolomys lasiurus in an Amazonian savanna. Densities were evaluated in 31 plots of 4 ha distributed over an area of approximately 10×10 km. The cover of the tall grass (Trachypogon plumosus), short grass (Paspalum carinatum), shrubs and the extent of fire did not explain the variance in densities of Bolomys lasiurus. Food availability alone explained about 53% of the variance in B. lasiurus densities, and there was no significant relationship between insect abundance and vegetation structure. Fires had little short-term impact on the density of Bolomys lasiurus in the area we studied. As the species appears to respond principally to food availability, habitat suitability models based on easily recorded vegetation-structure variables, or the frequency of disturbance by fire, may not be effective in predicting the distribution of the species within savannas.

scholarly journals Energetics of stress: linking plasma cortisol levels to metabolic rate in mammals

2016 ◽  
Vol 12 (1) ◽  
pp. 20150867 ◽  
Author(s):  
Catherine G. Haase ◽  
Andrea K. Long ◽  
James F. Gillooly
Keyword(s):  
Metabolic Rate ◽  
Plasma Cortisol ◽  
Physiological Stress ◽  
Stress Hormone ◽  
Short Term ◽  
Primary Stress ◽  
Baseline Concentrations ◽  
Species Comparisons ◽  
Point Of Departure

Physiological stress may result in short-term benefits to organismal performance, but also long-term costs to health or longevity. Yet, we lack an understanding of the variation in stress hormone levels (i.e. glucocorticoids) that exist within and across species. Here, we present comparative analyses that link the primary stress hormone in most mammals (i.e. cortisol) to metabolic rate. We show that baseline concentrations of plasma cortisol vary with mass-specific metabolic rate among cortisol-dominant mammals, and both baseline and elevated concentrations scale predictably with body mass. The results quantitatively link a classical measure of physiological stress to whole-organism energetics, providing a point of departure for cross-species comparisons of stress levels among mammals.

Antarctic marine secondary production and the phenomenon of cold adaptation

1977 ◽  
Vol 279 (963) ◽  
pp. 55-66 ◽  
Keyword(s):  
Food Availability ◽  
Growth Rates ◽  
Secondary Production ◽  
Cold Adaptation ◽  
Life Histories ◽  
Short Term ◽  
Signy Island ◽  
Antarctic Waters ◽  
Antarctic Marine ◽  
Mode Of Life

For several years marine biologists of British Antarctic Survey have been studying the nearshore communities at Signy Island and South Georgia. Most of these studies have been continued throughout the year so that variations in production in both the long and short term have been investigated. In this paper changes in the rate of growth of selected crustacean, molluscan and fish species are considered throughout their life histories. Variations in growth rates are considered in relation to temperature, food availability and mode of life and comparisons are made with species from outside antarctic waters.

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