The Function of the Lake Sturgeon, Acipenser Fulvescens, Thyroid System and Dietary Effects PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download The Function of the Lake Sturgeon, Acipenser Fulvescens, Thyroid System and Dietary Effects PDF full book. Access full book title The Function of the Lake Sturgeon, Acipenser Fulvescens, Thyroid System and Dietary Effects by . Download full books in PDF and EPUB format.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The basic properties of the lake sturgeon ('Acipenser fulvescens ') thyroid system were studied to confirm and explain previously reported low plasma thyroid hormone (TH) levels. The THs from a variety of sturgeon tissues were extracted and assayed to determine their concentrations. Once the basic principles of the sturgeon thyroid system were established, the ability of sturgeon to modify thyroid function in response to changes in dietary constituents was studied. Two diets, ocean plankton and Martin's trout pellets, were fed to two groups of sturgeon. Finally the ability of the lake sturgeon to cope with a dietary induced T3-challenge was studied. In conclusion, the lake sturgeon thyroid system has several characteristics that differ from the teleost fish system. It is concluded that the lake sturgeon's thyroid system functions most similarly to organisms that live in low iodide environments like the mammals. (Abstract shortened by UMI.).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The basic properties of the lake sturgeon ('Acipenser fulvescens ') thyroid system were studied to confirm and explain previously reported low plasma thyroid hormone (TH) levels. The THs from a variety of sturgeon tissues were extracted and assayed to determine their concentrations. Once the basic principles of the sturgeon thyroid system were established, the ability of sturgeon to modify thyroid function in response to changes in dietary constituents was studied. Two diets, ocean plankton and Martin's trout pellets, were fed to two groups of sturgeon. Finally the ability of the lake sturgeon to cope with a dietary induced T3-challenge was studied. In conclusion, the lake sturgeon thyroid system has several characteristics that differ from the teleost fish system. It is concluded that the lake sturgeon's thyroid system functions most similarly to organisms that live in low iodide environments like the mammals. (Abstract shortened by UMI.).
Author: James Plohman
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
The basic properties of the lake sturgeon ('Acipenser fulvescens ') thyroid system were studied to confirm and explain previously reported low plasma thyroid hormone (TH) levels. The THs from a variety of sturgeon tissues were extracted and assayed to determine their concentrations. Once the basic principles of the sturgeon thyroid system were established, the ability of sturgeon to modify thyroid function in response to changes in dietary constituents was studied. Two diets, ocean plankton and Martin's trout pellets, were fed to two groups of sturgeon. Finally the ability of the lake sturgeon to cope with a dietary induced T3-challenge was studied. In conclusion, the lake sturgeon thyroid system has several characteristics that differ from the teleost fish system. It is concluded that the lake sturgeon's thyroid system functions most similarly to organisms that live in low iodide environments like the mammals. (Abstract shortened by UMI.).
Author: Gwangseok Yoon
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
The environment during early life history strongly impacts phenotypic development in all organisms, which further influences developmental trajectory and ecological fitness later in life. Depending on the developmental stage and magnitude of change in the environment, phenotypes may become irreversible and thus have a long-lasting effect later in life. This thesis was designed to better understand how changes in the environment may influence plasticity and variation of metabolic phenotypes of Lake Sturgeon (Acipenser fulvescens) within the first year of life. Broadly speaking, the thesis tested two hypotheses that 1) all measured phenotypes would be plastic; and 2) durations of environmental effects on phenotypic development would be correlated with distinct developmental windows. Studies were developed to examine 1) short-term effects of temperature or diet on metabolic phenotypes such as metabolic rate, energy density, fatty acid profiles, and growth (Chapters 2 and 3) and 2) longer-term effects of temperature or diet during early life on these metabolic phenotypes (Chapters 4, 5 and 6). The first experimental chapter (Chapter 2) examined ontogenetic development of metabolic rate and demonstrated that dietary shifts between Artemia to bloodworm resulted in cessation of growth with elevated routine metabolic rate. Chapter 3 examined how fatty acid profiles and plasma cortisol concentration were influenced by environmental temperature and showed that decreasing temperature led to increases in mono- and polyunsaturated fatty acids in both phospholipids and triglycerides, and food deprivation resulted in lack of difference between baseline and peak cortisol concentrations. Chapter 4 examined how temperature during early life influenced plasticity of growth and showed that temperature post-dietary transition resulted in a transient effect on growth and energy metabolism without long-term effects post-winter. Chapter 5 examined how temperature during early life could influence growth and fatty acid metabolism when fish were exposed to colder temperatures later in life and demonstrated that elevated temperatures resulted in a longer-term effect on growth but lack of transcriptional responses of desaturating fatty acids when exposed to a cold temperature (3.5°C) later in life. The final experimental chapter, Chapter 6 examined longer-term effects of diet at the onset of exogenous feeding on metabolism and growth and demonstrated that an enriched diet resulted in prolonged effects on growth, digestive enzyme activity and survival prior to a simulated overwintering. This doctoral thesis research revealed that all measured metabolic phenotypes were plastic, but subtle changes in temperature and diet during early life history resulted in transient or prolonged effects on growth and metabolism in age-0 lake sturgeon. Results will aid our understanding of cohort and population dynamics as well as contribute to the development of conservation strategies for lake sturgeon, a species at risk or endangered across its natural range.
Author: Kevin E. Wehrly
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 29
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 43
Get Book Here
Book Description
"Raising lake sturgeon (Acipenser fulvescens) in hatcheries is an important tool for rehabilitation and conservation, but is expensive. When hatchery sturgeon do not grow large enough before stocking, their odds of survival decline significantly and resources are wasted. We investigated the potential limiting effect of large lake sturgeon on the growth rate of smaller conspecifics housed in the same tank, and the possibility of increasing growth rates by separating individuals into different size classes. We also examined plasma cortisol levels of the different size classes over time as an indicator of stress levels, and levels of free plasma thyroid hormones triiodothyronine (T3) and thyroxine (T4). A single family of lake sturgeon (one male/female cross) was raised in the Northern Michigan University Aquatics laboratory for one year. Growth of the sturgeon was determined both as group averages and for individuals. Separating lake sturgeon by size group had no discernable effect on average growth rates in any of the size categories, but individuals within size groups did show increased growth rates. All three categories ended the experiment with broadened size distributions. Cortisol levels showed no consistent differences based on size (Cortisol [pg/mL ± SE] =229.27 ± 11.21). Plasma thyroid hormone levels were also similar between size categories (T3 [pg/mL ± SE] =8.53 ± 0.26; T4=0.86 ± 0.04). Separation of lake sturgeon by size category does not appear to increase their average growth rates in captivity, but all size groups continued to increase in size throughout the experiment."--Abstract.
Author: Duncan Burnett
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1742
Get Book Here
Book Description
Vols. for 1963- include as pt. 2 of the Jan. issue: Medical subject headings.
Author: Jadon A. Motquin
Publisher:
ISBN:
Category : Aquatic ecology
Languages : en
Pages : 0
Get Book Here
Book Description
Author: David O. Norris
Publisher: Academic Press
ISBN: 0080958095
Category : Technology & Engineering
Languages : en
Pages : 1681
Get Book Here
Book Description
This series of volumes represents a comprehensive and integrated treatment of reproduction in vertebrates from fishes of all sorts through mammals. It is designed to provide a readable, coordinated description of reproductive basics in each group of vertebrates as well as an introduction to the latest trends in reproductive research and our understanding of reproductive events. Whereas each chapter and each volume is intended to stand alone as a review of that topic or vertebrate group, respectively, the volumes are prepared so as to provide a thorough topical treatment across the vertebrates. Terminology has been standardized across the volumes to reduce confusion where multiple names exist in the literature, and a comprehensive glossary of these terms and their alternative names is provided. A complete, essential and up to date reference for research scientists working on vertebrate hormones and reproduction - and on animlals as models in human reproductive research Covers the endocrinology, neuroendocrinology, physiology, behaviour and anatomy of vertebrate reproduction Structured coverage of the major themes for all five vertebrate groups allows a consistent treatment for all Special chapters elaborate on features specific to individual vertebrate groups and to comparative aspects, similarities and differences between them
Author: Eddie J. Heath
Publisher:
ISBN:
Category : Helminths
Languages : en
Pages : 70
Get Book Here
Book Description
