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Author:
Publisher:
ISBN: 9789463950336
Category :
Languages : en
Pages : 163
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Book Description
A live-bearing mode of reproduction implies morphological and physiological constraints, which in fish might be influenced by the physical characteristics of water: a higher density which favours hydrodynamic body shapes and requires an extensive muscle system to propel the bodies through the dense liquid. This thesis aims to improve the understanding of the relationship between the morphological changes caused by pregnancy and the swimming performance of fish. I based my research on the live-bearing fish family Poeciliidae, which presents a wide variation of maternal provisioning that range from feeding their internally developing embryos exclusively from the nutrients that have been stored in the egg-yolk prior to fertilization (lecithotrophy), to almost exclusively nourish them through a placenta (placentotrophy).
Author:
Publisher:
ISBN: 9789463950336
Category :
Languages : en
Pages : 163
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Book Description
A live-bearing mode of reproduction implies morphological and physiological constraints, which in fish might be influenced by the physical characteristics of water: a higher density which favours hydrodynamic body shapes and requires an extensive muscle system to propel the bodies through the dense liquid. This thesis aims to improve the understanding of the relationship between the morphological changes caused by pregnancy and the swimming performance of fish. I based my research on the live-bearing fish family Poeciliidae, which presents a wide variation of maternal provisioning that range from feeding their internally developing embryos exclusively from the nutrients that have been stored in the egg-yolk prior to fertilization (lecithotrophy), to almost exclusively nourish them through a placenta (placentotrophy).
Author: Paolo Domenici
Publisher: CRC Press
ISBN: 1000738035
Category : Science
Languages : en
Pages : 463
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Book Description
Fish accomplish most of their basic behaviors by swimming. Swimming is fundamental in a vast majority of fish species for avoiding predation, feeding, finding food, mating, migrating and finding optimal physical environments. Fish exhibit a wide variety of swimming patterns and behaviors. This treatise looks at fish swimming from the behavioral and
Author: Katrina Whitlow
Publisher:
ISBN:
Category :
Languages : en
Pages : 93
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Book Description
Fish have evolved a great variety of swimming modes and morphologies. Theory suggests that the morphology of median and paired fin swimmers like knifefish specializes them for maneuvering while inhibiting their performance in sustained and acceleratory swimming. However, this idea has not been explicitly tested and the link between shape and swimming mode in this group is poorly understood. This study compares morphological measurements of 116 species (51 knifefish) across four orders to investigate the diversity of shape in knifefish and closely related species. Sprint speeds, escape responses, and cost of transport were measured in 7 species (5 knifefish) to understand the physiological performance of these fish. Results indicated morphological constraints and unexpectedly high swimming performance associated with gymnotiform locomotion. Together, these data test common hypotheses in the field of fish swimming and provide a clearer picture of the evolution of diversity in fish locomotion.
Author: Joseph Michael Styga
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 216
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Book Description
Animals depend on numerous fitness-related performance characteristics for survival, and reproduction. Variation in these performance characteristics is often a consequence of selection on morphological variation. However, the link between morphology and performance is not always straightforward. Many anatomical arrangements may provide similar levels of performance. Thus, the evolution of performance characteristics may depend on the extent to which groups of morphological traits are correlated with one another and with performance, and the extent which this variation and covariation is due to genetic factors. However, the link between form and function as well as the genetic structure among morphological traits may vary across ontogeny. Despite this, few studies have taken an ontogenetic perspective when studying the evolution of performance and associated morphology. Here, I assess variation within and covariation among morphological (i.e. bones associated with the caudal peduncle) and performance (i.e. terrestrial jumping) traits to determine how the relationship between form and function, and heritable variation in and among functionally important morphological traits, change across ontogeny in the mangrove rivulus fish. I later determine how genetic variance/covariance among performance related traits have influenced divergence among populations, and if this relationship is age-dependent. Finally, using the genus Fundulus, I determine how natural selection posed by one selective force (i.e. salinity) may have influenced ontogenetic variation in morphology. Throughout I demonstrate that our understanding of morphological and performance evolution may by greatly enhanced by taking an ontogenetic perspective.
Author: Nelson Çabej
Publisher: Elsevier
ISBN: 0124158315
Category : Science
Languages : en
Pages : 847
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Book Description
Cabej (biology, U. of Tirana, Albania) explains the epigenetic principles of evolution (as opposed to the theory of evolution as determined by changes in genes) and reconstructs the developmental mechanisms of evolutionary changes in metazoans, based on empirical evidence. He focuses on the mechanisms of the generation of the evolutionary innovations from the influence of environment on heredity rather than the role of natural selection. He discusses control systems and determination of phenotypic traits in metazoans, neural manipulation of gene expression, epigenetic control of reproduction and early development, neural control of postphylotypic development, and the epigenetic system of inheritance. He follows with description of neural-developmental premises of evolutionary adaptation, including evolution and stress responses and behavioral adaptation to changes in environment, ontogeny, and intragenerational developmental plasticity; epigenetics of circumevolutionary phenomena and the mechanism of evolutionary change, including transgenerational developmental plasticity and the evolution of metazoans and their control system; and the origins of evolutionary novelty, evolution by loss or by reverting to ancestral characters, neural crest-determined evolutionary novelties, evolutionary convergences, species and allopatric speciation, and sympatric speciation. He presents the available evidence for his theory, rather than illustrating an established theory, and includes a comparative presentation of the neo-Darwinian view to his epigenetic explanation. There is no index. Annotation ©2012 Book News, Inc., Portland, OR (booknews.com).
Author:
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 11
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Book Description
Author: Larry A. Hunter
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Paolo Domenici
Publisher: CRC Press
ISBN: 1439843120
Category : Science
Languages : en
Pages : 549
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Book Description
Fish accomplish most of their basic behaviors by swimming. Swimming is fundamental in a vast majority of fish species for avoiding predation, feeding, finding food, mating, migrating and finding optimal physical environments. Fish exhibit a wide variety of swimming patterns and behaviors. This treatise looks at fish swimming from the behavioral and
Author:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 2324
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Book Description
Vols. for 1963- include as pt. 2 of the Jan. issue: Medical subject headings.
Author: Francesc Piferrer
Publisher: John Wiley & Sons
ISBN: 1119821916
Category : Technology & Engineering
Languages : en
Pages : 549
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Book Description
EPIGENETICS IN AQUACULTURE This essential guide will allow you to understand how new developments in our knowledge of epigenetic mechanisms and epigenetic inheritance can be applied to improve aquaculture production and aquatic resource management and conservation. Epigenetics is the study of heritable changes in gene expression that are independent of alterations in the nucleotide sequence. It integrates genomic and environmental influences to shape the phenotype. Epigenetics is a field with particular relevance to aquaculture and aquatic organisms, since it underpins acclimatory responses to diverse and changing environments and inheritance of desired phenotypes. Epigenetics in Aquaculture provides a comprehensive introduction to epigenetics, epigenetic mechanisms, epigenetic inheritance, and research methods. It also provides the current state of the art on research and development on epigenetics in the major functions of aquatic organisms in the framework of aquaculture production. The fact that aquaculture is the fastest-growing sector of food production makes the book especially timely. Readers will also find: Detailed treatment of subjects including aquatic faunal reproduction, sex determination, growth regulation, nutritional programming, disease resistance, stress response and much more Survey of current research lacunae and the projected future of the discipline An authorial team of internationally renowned experts Epigenetics in Aquaculture is a valuable reference for researchers, biologists and advanced students in any area of marine science, oceanography, aquaculture, environmental science, and food production.
