Download or read book Morphological Changes Fish Predation and Elements of Sexual Reproduction in Populations of Daphnia Pulex written by John R. Krummel and published by . This book was released on 1978 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Consequences of Predation by Chaoborus Americanus on Daphnia Pulex written by Ken Rollin Spitze and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The direct and indirect effects of predation by the aquatic dipteran larva Chaoborus americanus on the crustacean Daphnia pulex were investigated with a combination of laboratory and field assessments. All approaches indicated that Chaoborus inflict a pattern of size-specific mortality on Daphnia that can be well approximated by a Gaussian function. Maximum vulnerability is experienced by Daphnia with body size of about 1 mm. Daphnia larger that 2 mm were essentially invulnerable. Several techniques are presented that remove biases that exist in previous methods used to assess size-specific vulnerability. C. americanus emits a water soluble chemical that induces a morphological change within clones of D. pulex, most notably, the formation of a small horn on the dorsal margin of the head. Controlled laboratory experiments indicate that the horned morph experiences a 34-67% reduction in mortality, relative to the normal morph. Life table assays of many clones that compared the induced and non-induced morphs of each clone under identical conditions (except for induction factor) indicate substantial genotype x environment interaction for life history characters. Some clones showed a dramatic increase in body size, growth, and reproduction while other clones displayed a delay in reproduction, indicating a potential energetic cost to the induced morph. The significant genotype x environment interactions for many life-history characters indicate substantial genetic variance for the phenotypic plasticity. Assessments from large genetically diverse replicate laboratory populations indicate that Chaoborus predation can have significant effects on the clonal composition of Daphnia populations. Life table studies of laboratory populations in the presence and absence of Chaoborus indicate that Chaoborus predation leads to significant changes in mean population life history. Increased immature body size and delayed maturity were the most significant effects attributable directly to Chaoborus predation.
Download or read book The Impact of Natural Phytoplankton Assemblages on Daphnia Pulex Reproduction in Oneida Lake New York written by Kenneth Joseph Wagner and published by . This book was released on 1983 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Limnoecology written by Winfried Lampert and published by Oxford University Press, USA. This book was released on 2007-07-26 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition will build upon the strengths of the earlier work but will be thoroughly revised throughout to incorporate findings from new technologies and methods (notably the rapid development of molecular genetic methods and stable isotope techniques) that have allowed a rapid and ongoing development of the field.
Download or read book The Virgin Swamp written by Alvan Rogers Brick and published by . This book was released on 1981 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eco Evolutionary Dynamics written by and published by Academic Press. This book was released on 2014-08-12 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theme of this volume is to discuss Eco-evolutionary Dynamics. Updates and informs the reader on the latest research findings Written by leading experts in the field Highlights areas for future investigation
Download or read book Current References in Fish Research written by and published by . This book was released on 1979 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Peroxisomes and their Key Role in Cellular Signaling and Metabolism written by Luis A. del Río and published by Springer Science & Business Media. This book was released on 2013-07-03 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Peroxisomes are a class of ubiquitous and dynamic single membrane-bounded cell organelles, devoid of DNA, with an essentially oxidative type of metabolism. In recent years it has become increasingly clear that peroxisomes are involved in a range of important cellular functions in almost all eukaryotic cells. In higher eukaryotes, including humans, peroxisomes catalyze ether phospholipids biosynthesis, fatty acid alpha-oxidation, glyoxylate detoxification, etc, and in humans peroxisomes are associated with several important genetic diseases. In plants, peroxisomes carry out the fatty acid beta-oxidation, photorespiration, metabolism of ROS, RNS and RSS, photomorphogenesis, biosynthesis of phytohormones, senescence, and defence against pathogens and herbivores. In recent years it has been postulated a possible contribution of peroxisomes to cellular signaling. In this volume an updated view of the capacity and function of peroxisomes from human, animal, fungal and plant origin as cell generators of different signal molecules involved in distinct processes of high physiological importance is presented.
Download or read book Lost Sex written by Isa Schön and published by Springer Science & Business Media. This book was released on 2009-09-22 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sex is the queen of problems in evolutionary biology. Generations of researchers have investigated one of the last remaining evolutionary paradoxes: why sex exists at all. Given that sexual reproduction is costly from an evolutionary point of view, one could wonder why not all animals and plants reproduce asexually. Dozens of contemporary hypotheses attempt to explain the prevalence of sex and its advantages and predict the early extinction of fully asexual lineages. The major theme of this book is: what is the fate of animal and plant groups in which sex is lost? Initial chapters discuss theory behind asexual life: what major disadvantages do asexual groups have to face, what are the genetic and ecological consequences and what does this theory predict for more applied aspects of asexual life, for example in agricultural pests, diseases as well as in cultural crops such as grapes. Cases studies in many animals (focusing on both invertebrates and vertebrates) and plants reveal parallel, but also singularly novel adaptations to the absence of meiosis and syngamy. And last but not least, are asexuals really doomed to early extinction or do genuine ancient asexuals exist? This book assembles contributions from the most important research groups dealing with asexual evolution in eukaryotes. It is a milestone in research on parthenogenesis and will be useful to undergraduate as well as graduate students and to senior researchers in all fields of evolutionary biology, as the paradox of sex remains its queen of problems.
Download or read book Annual Report of the New York State College of Agriculture and Life Sciences at Cornell University the Cornell University Agricultural Experiment Station written by New York State College of Agriculture and Life Sciences and published by . This book was released on 1979 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Report of the New York State College of Agriculture and Life Sciences at Cornell University the Cornell University Agricultural Experiment Station written by New York State College of Agriculture and published by . This book was released on 1979 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1978 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Union Catalog written by and published by . This book was released on 1982 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes entries for maps and atlases.
Download or read book The Ecology and Evolution of Inducible Defenses written by Ralph Tollrian and published by Princeton University Press. This book was released on 1999-01-17 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inducible defenses--those often dramatic phenotypic shifts in prey activated by biological agents ranging from predators to pathogens--are widespread in the natural world. Yet research on the inducible defenses used by vertebrates, invertebrates, and plants in terrestrial, marine, and freshwater habitats has largely developed along independent lines. Tollrian and Harvell bring together leading researchers from all fields to review common themes and explore emerging ideas. Contributors examine organisms as different as unicellular algae and higher vertebrates, and consider defenses ranging from immune systems to protective changes in morphology, behavior, chemistry, and life history.
Download or read book Test No 211 Daphnia magna Reproduction Test written by OECD and published by OECD Publishing. This book was released on 2008-10-16 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: The test method described in this Test Guideline assesses the effect of chemicals on the reproductive output of Daphnia magna Straus. To this end, young female Daphnia are exposed to the test substance added to water at a range of concentrations (at ...
Download or read book Wildlife Disease Ecology written by Kenneth Wilson and published by Cambridge University Press. This book was released on 2019-11-14 with total page 693 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduces readers to key case studies that illustrate how theory and data can be integrated to understand wildlife disease ecology.
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:
