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Inducible defenses alter the strength of interaction in food webs. Theoretical models that incorporate their effects are therefore critical for predicting community dynamics and stability. I examined ecological effects of an inducible morphological defense in a microbial model. I first investigated the effect of genotype. number of predators, and previous exposure to predators on the speed and maximum level of defense for eight clones in three species of the ciliate Euplotes. The effectiveness of defense depends on both of these aspects of defense induction: therefore these traits should evolve in concert. The speed and maximum level of induction varied among genotypes, showing that there is genetic variance for these traits and the potential for evolutionary change under selection. Higher predator densities led to more rapid induction and higher maximum levels of defense. but previous exposure to predators had no detectable effect on either of these traits. I then used a model selection approach to determine the shape of the functional response of clones that differed in their level of defense, and to estimate and compare the model parameters attack rate and handling time. Defense decreased the attack rate of Euploes on Chlorella vulgar-is algae in one highly defended clone, but did not affect the functional response in two less defended clones. My results demonstrate that Euploes ciliates can precisely and rapidly adjust their morphological defense to the magnitude of predation risk in a way that varies among genotypes. This variation will lead to diversity in prey vulnerability to predators under natural conditions and translates to genetically-based differences in the foraging impact on resources of Euplotes. These estimates of ecological effects of induced defense in this system allow their inclusion in the development and testing of dynamic models. This in turn will inform our understanding of the influence of induced defenses and related trait-mediated indire.
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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.
distances between groups of ciliates were as vast as significant hurdles to obtain copyright permissions the genetic distances between plants and animals for the over 1,000 required illustrations, and I put – THE major eukaryotic kingdoms at that time! the publication schedule ahead of this element. I continued to collaborate with Mitch, and in There are a number of significant illustrated guides 1991 my first “molecular” Magisterial student, to genera and species that have recently been pub- Spencer Greenwood, published an article estab- lished. References are made to these throughout lishing 1990 or thereabouts as the beginning of the book as sources that readers can consult for this the “Age of Refinement” – the period when gene aspect of ciliate diversity. A future project that I am sequencing techniques would deepen our under- contemplating is an illustrated guide to all the valid standing of the major lines of evolution within ciliate genera.
"The third edition of Ecology and Classification of North American Freshwater Invertebrates continues the tradition of in-depth coverage of the biology, ecology, phylogeny, and identification of freshwater invertebrates from the USA and Canada. This text serves as an authoritative single source for a broad coverage of the anatomy, physiology, ecology, and phylogeny of all major groups of invertebrates in inland waters of North America, north of Mexico." --Book Jacket.
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Community ecology is the study of the interactions between populations of co-existing species. Co-edited by two prominent community ecologists and featuring contributions from top researchers in the field, this book provides a survey of the state-of-the-art in both the theory and applications of the discipline. It pays special attention to topology, dynamics, and the importance of spatial and temporal scale while also looking at applications to emerging problems in human-dominated ecosystems (including the restoration and reconstruction of viable communities). Community Ecology: Processes, Models, and Applications adopts a mainly theoretical approach and focuses on the use of network-based theory, which remains little explored in standard community ecology textbooks. The book includes discussion of the effects of biotic invasions on natural communities; the linking of ecological network structure to empirically measured community properties and dynamics; the effects of evolution on community patterns and processes; and the integration of fundamental interactions into ecological networks. A final chapter indicates future research directions for the discipline.
The three main missions of any organism--growing, reproducing, and surviving--depend on encounters with food and mates, and on avoiding encounters with predators. Through natural selection, the behavior and ecology of plankton organisms have evolved to optimize these tasks. This book offers a mechanistic approach to the study of ocean ecology by exploring biological interactions in plankton at the individual level. The book focuses on encounter mechanisms, since the pace of life in the ocean intimately relates to the rate at which encounters happen. Thomas Kiørboe examines the life and interactions of plankton organisms with the larger aim of understanding marine pelagic food webs. He looks at plankton ecology and behavior in the context of the organisms' immediate physical and chemical habitats. He shows that the nutrient uptake, feeding rates, motility patterns, signal transmissions, and perception of plankton are all constrained by nonintuitive interactions between organism biology and small-scale physical and chemical characteristics of the three-dimensional fluid environment. Most of the book's chapters consist of a theoretical introduction followed by examples of how the theory might be applied to real-world problems. In the final chapters, mechanistic insights of individual-level processes help to describe broader population dynamics and pelagic food web structure and function.
Lessons in Immunity: From Single-cell Organisms to Mammals stems from the activity of the Italian Association of Developmental and Comparative Immunobiology (IADCI), represented by the editors. This book is presented as a series of short overviews that report on the current state of various relevant fields of immunobiology from an evolutionary perspective. The overviews are written by authors directly involved in the research, and most are members of the IADCI or have otherwise been involved in the related research for their respective overview. This publication offers scientists and teachers an easy and updated reference tool. - Provides simple and updated reviews on the immunobiology of a wide spectrum of organisms, considered in an evolutionary context - Focuses on both cells and humoral components of a variety of non-classical model organisms - Offers in a single volume many contributions which can help with understanding the evolution of immune responses and the main adaptations in animal phyla - Presents a valuable holistic cross-sectional approach for teaching immunology and its applications