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Mechanisms That Generate Resource Pulses in a Fluctuating Wetland
Title
Mechanisms That Generate Resource Pulses in a Fluctuating Wetland.
Creator
Botson, Bryan A., Gawlik, Dale E., Trexler, Joel C., Hewitt, Judi
Date Issued
2016-07-22
PURL
http://purl.flvc.org/fau/fd/FAUIR000092
Format
Citation
Determining habitat quality for species that demonstrate dynamic habitat selection
Title
Determining habitat quality for species that demonstrate dynamic habitat selection.
Creator
Beerens, James M., Frederick, Peter C., Noonburg, Erik G., Gawlik, Dale E.
Date Issued
2015-11-19
PURL
http://purl.flvc.org/fau/fd/FAUIR000141
Format
Citation
Linking Dynamic Habitat Selection with Wading Bird Foraging Distributions across Resource Gradients
Title
Linking Dynamic Habitat Selection with Wading Bird Foraging Distributions across Resource Gradients.
Creator
Beerens, James M., Noonburg, Erik G., Gawlik, Dale E., Gao, Chang-Qing
Date Issued
2015-06-24
PURL
http://purl.flvc.org/fau/fd/FAUIR000142
Format
Citation
Physiological Condition of Juvenile Wading Birds in Relation to Multiple Landscape Stressors in the Florida Everglades: Effects of Hydrology, Prey Availability, and Mercury Bioaccumulation
Title
Physiological Condition of Juvenile Wading Birds in Relation to Multiple Landscape Stressors in the Florida Everglades: Effects of Hydrology, Prey Availability, and Mercury Bioaccumulation.
Creator
Herring, Garth, Eagles-Smith, Collin A., Gawlik, Dale E., Beerens, James M., Ackerman, Joshua T., Gao, Chang-Qing
Abstract/Description
The physiological condition of juvenile birds can be influenced by multiple ecological stressors, and few studies have concurrently considered the effects of environmental contaminants in combination with ecological attributes that can influence foraging conditions and prey availability. Using three temporally distinct indices of physiological condition, we compared the physiological response of nestling great egrets (Ardea alba) and white ibises (Eudocimus albus) to changing prey...
Show moreThe physiological condition of juvenile birds can be influenced by multiple ecological stressors, and few studies have concurrently considered the effects of environmental contaminants in combination with ecological attributes that can influence foraging conditions and prey availability. Using three temporally distinct indices of physiological condition, we compared the physiological response of nestling great egrets (Ardea alba) and white ibises (Eudocimus albus) to changing prey availability, hydrology (water depth, recession rate), and mercury exposure in the Florida Everglades. We found that the physiological response of chicks varied between species and among environmental variables. Chick body condition (shortterm index) and fecal corticosterone levels (medium-term) were influenced by wetland water depth, prey availability, region, and age, but not by mercury contamination. However, mercury exposure did influence heat shock protein 70 (HSP70) in egret chicks, indicating a longer-term physiological response to contamination. Our results indicate that the physiological condition of egret and ibis chicks were influenced by several environmental stressors, and the time frame of the effect may depend on the specialized foraging behavior of the adults provisioning the chicks.
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Date Issued
2014-09-03
PURL
http://purl.flvc.org/fau/fd/FAUIR000064
Format
Citation
The Role of Stress Proteins in the Study of Allostatic Overload in Birds: Use and Applicability to Current Studies in Avian Ecology
Title
The Role of Stress Proteins in the Study of Allostatic Overload in Birds: Use and Applicability to Current Studies in Avian Ecology.
Creator
Herring, Garth, Gawlik, Dale E.
Abstract/Description
Stress proteins offer a measure of stress in birds at the cellular level that are an alternative to the glucocorticoids. Stress proteins are not biased by handling stress, the increase in stress proteins lasts longer than with other measures (e.g., corticosterone), and, therefore, they may be a more appropriate measure of long-term or chronic stress. However, caution should be practiced when using stress proteins because the level of stress needed to elicit a response may be higher than with...
Show moreStress proteins offer a measure of stress in birds at the cellular level that are an alternative to the glucocorticoids. Stress proteins are not biased by handling stress, the increase in stress proteins lasts longer than with other measures (e.g., corticosterone), and, therefore, they may be a more appropriate measure of long-term or chronic stress. However, caution should be practiced when using stress proteins because the level of stress needed to elicit a response may be higher than with corticosterone. Stress proteins have only recently been used to measure the response to competition, food limitation, growth, and parasitism in birds. In other taxa, the stress proteins have been used to measure genetic stress, temperature, toxins, UV radiation, and physical activity. Stress proteins increase the options available to avian ecologists for understanding how avian species respond to changes in the environment.
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Date Issued
2007
PURL
http://purl.flvc.org/fau/fd/FAUIR000071
Format
Citation