The Evolution of Placentas in Poeciliid Fishes

The Evolution of Placentas in Poeciliid Fishes PDF Author: Marcelo Nolla Pires
Publisher:
ISBN:
Category : Desert topminnows
Languages : en
Pages : 508

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The Evolution of Placentas in Poeciliid Fishes

The Evolution of Placentas in Poeciliid Fishes PDF Author: Marcelo Nolla Pires
Publisher:
ISBN:
Category : Desert topminnows
Languages : en
Pages : 508

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The Genomics of Placenta Evolution in Livebearing Fish

The Genomics of Placenta Evolution in Livebearing Fish PDF Author:
Publisher:
ISBN: 9789464470376
Category :
Languages : en
Pages : 174

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The Structure, Function, and Development of the Follicular Placenta in the Viviparous Poeciliid Fish, Heterandria Formosa

The Structure, Function, and Development of the Follicular Placenta in the Viviparous Poeciliid Fish, Heterandria Formosa PDF Author: Bryon Dennis Grove
Publisher:
ISBN:
Category :
Languages : en
Pages : 568

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Ecology and Evolution of Poeciliid Fishes

Ecology and Evolution of Poeciliid Fishes PDF Author: Jonathan P. Evans
Publisher: University of Chicago Press
ISBN: 0226222764
Category : Science
Languages : en
Pages : 424

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Book Description
The history of biology is populated by numerous model species or organisms. But few vertebrate groups have aided evolutionary and ecological research more than the live-bearing fishes of the family Poeciliidae. Found throughout tropical and subtropical waters, poeciliids exhibit a fascinating variety of reproductive specializations, including viviparity, matrotrophy, unisexual reproduction, and alternative mating strategies, making them ideal models for research on patterns and processes in ecology, behavior, and evolution. Ecology and Evolution of Poeciliid Fishes is a much-needed overview of the scientific potential and understanding of these live-bearing fishes. Chapters by leading researchers take up a wide range of topics, including the evolution of unisexual reproduction, life in extreme environments, life-history evolution, and genetics. Designed to provide a single and highly approachable reference, Ecology and Evolution of Poeciliid Fishes will appeal to students and specialists interested in all aspects of evolutionary ecology.

Evolutionary Diversification of Reproductive Modes in Livebearing Fishes

Evolutionary Diversification of Reproductive Modes in Livebearing Fishes PDF Author: Amanda Inez Banet
Publisher:
ISBN:
Category : Desert topminnows
Languages : en
Pages : 121

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Book Description
Placental matrotrophy has evolved independently in many lineages, which is indicative of strong selection. Several ad-hoc hypotheses and one mathematical model have been proposed to explain its evolution, but little experimental data exists to support these claims. Recent studies have attempted to find correlates between placental matrotrophy and other life history traits, but the only common correlate found was a reduction in reproductive allocation (RA). Here I report on three studies. The first two focus on the Trexler-DeAngelis model for the evolution of matrotrophy. In chapter one, I use closely related placental and non-placental species from the northern clade of Poeciliopsis to test an assumption imperative to the model, that placental species abort a subset of developing offspring in low food conditions. The results show no evidence of abortion due to food level. Instead, placental species appear to be tethered to a brood once initiated, and sacrifice body condition to maintain reproduction when resources are restricted. However, an alternative explanation for these results is that the pattern of resource allocation is a function other life history traits, rather than placentation alone. Chapter two distinguishes between these alternatives, by performing a similar experiment on the southern clade of Poeciliopsis, which has the opposite relationship between life history traits and placentation seen in the northern clade. The results mirror those from the northern clade, indicating reproductive mode, rather than life history, dictates the pattern of resource allocation. This further adds to the difficulties of explaining the evolution of the placenta within the constraints of the Trexler-DeAngelis model. The third study characterizes locomotor consequences related to differences in reproductive allocation using the Trinidadian Guppy (Poecilia reticulata), because placentation is correlated with a reduction in reproductive allocation. Females with the highest RA were less streamlined, had lower escape velocities, and had to work harder during prolonged swimming. In low predation natural habitat, these same females were restricted to habitat with slower moving water, while females with lower RAs were able to use faster flows, which are thought to be preferred feeding grounds. All high predation fish used slow moving water, irrespective of RA.

Ecology, Evolution, and Behavior of Viviparous Fishes

Ecology, Evolution, and Behavior of Viviparous Fishes PDF Author: J. Jaime Zúñiga-Vega
Publisher: Frontiers Media SA
ISBN: 2889745139
Category : Science
Languages : en
Pages : 249

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Endocrine Sex Differentiation in Fish

Endocrine Sex Differentiation in Fish PDF Author: T. J. Pandian
Publisher: CRC Press
ISBN: 1466575603
Category : Nature
Languages : en
Pages : 321

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Book Description
Of all vertebrates, fish exhibit unparalleled diversity of sexual plasticity and flexibility, ranging from gonochorism to unisexualism, and exceptional patterns of functional hermaphroditism. Fish farming and monosex aquaculture have led to reproductive dysfunction with males producing less milt, and females failing to ovulate and spawn. This book brings together relevant information on the role of the endocrine system on sexual differentiation in fish, and bridges the gap between molecular endocrinologists and fishery scientists.

The Origin Then and Now

The Origin Then and Now PDF Author: David N. Reznick
Publisher: Princeton University Press
ISBN: 1400833574
Category : Science
Languages : en
Pages : 449

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Book Description
An accessible modern guide to Darwin's masterwork Charles Darwin's Origin of Species is one of the most widely cited books in modern science. Yet tackling this classic can be daunting for students and general readers alike because of Darwin's Victorian prose and the complexity and scope of his ideas. The "Origin" Then and Now is a unique guide to Darwin's masterwork, making it accessible to a much wider audience by deconstructing and reorganizing the Origin in a way that allows for a clear explanation of its key concepts. The Origin is examined within the historical context in which it was written, and modern examples are used to reveal how this work remains a relevant and living document for today. In this eye-opening and accessible guide, David Reznick shows how many peculiarities of the Origin can be explained by the state of science in 1859, helping readers to grasp the true scope of Darwin's departure from the mainstream thinking of his day. He reconciles Darwin's concept of species with our current concept, which has advanced in important ways since Darwin first wrote the Origin, and he demonstrates why Darwin's theory unifies the biological sciences under a single conceptual framework much as Newton did for physics. Drawing liberally from the facsimile of the first edition of the Origin, Reznick enables readers to follow along as Darwin develops his ideas. The "Origin" Then and Now is an indispensable primer for anyone seeking to understand Darwin's Origin of Species and the ways it has shaped the modern study of evolution.

Ecology and Evolution of Poeciliid Fishes

Ecology and Evolution of Poeciliid Fishes PDF Author: Jonathan P. Evans
Publisher: University of Chicago Press
ISBN: 9780226222745
Category : Science
Languages : en
Pages : 0

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Book Description
The history of biology is populated by numerous model species or organisms. But few vertebrate groups have aided evolutionary and ecological research more than the live-bearing fishes of the family Poeciliidae. Found throughout tropical and subtropical waters, poeciliids exhibit a fascinating variety of reproductive specializations, including viviparity, matrotrophy, unisexual reproduction, and alternative mating strategies, making them ideal models for research on patterns and processes in ecology, behavior, and evolution. Ecology and Evolution of Poeciliid Fishes is a much-needed overview of the scientific potential and understanding of these live-bearing fishes. Chapters by leading researchers take up a wide range of topics, including the evolution of unisexual reproduction, life in extreme environments, life-history evolution, and genetics. Designed to provide a single and highly approachable reference, Ecology and Evolution of Poeciliid Fishes will appeal to students and specialists interested in all aspects of evolutionary ecology.

Reproductive Biology of Teleost Fishes

Reproductive Biology of Teleost Fishes PDF Author: Robert J. Wootton
Publisher: John Wiley & Sons
ISBN: 1118891392
Category : Technology & Engineering
Languages : en
Pages : 496

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Book Description
Reproductive Biology of Teleost Fishes is the first integrated review of the reproductive biology of the bony fishes, which are the most species-rich and diversified group of vertebrates. Teleosts display remarkable variation in their modes of reproduction, and this volume is intended to provide a framework for understanding the remarkable reproductive diversity of this group. It describes their reproductive biology using, wherever possible, phylogenetic analyses and life-history theory as a means to interpret the information. The book addresses the genetic, physiological, behavioural, ecological, evolutionary and applied aspects of teleost reproduction in a comparative framework that emphasises the adaptive basis of reproductive diversity. Reproductive Biology of Teleost Fishes provides a comprehensive synthesis of fish reproduction that will be of great interest to life scientists, particularly ecologists, evolutionary biologists, physiologists and advanced undergraduates, postgraduates and research workers requiring a comprehensive overview of fish reproduction. The book is suitable for courses in fish biology and ecology, reproductive physiology and reproductive genetics. It also addresses applied questions and will be of value for courses on fisheries science and aquaculture. Libraries in all universities and research establishments where biological sciences, fisheries science and aquaculture are studied and taught should have several copies of this important book on their shelves.