Ecology and Classification of North American Freshwater Invertebrates / Edition 1

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Overview

The First Edition of Ecology and Classification of North American Freshwater Invertebrates has been immensely popular with students and researchers interested in freshwater biology and ecology, limnology, environmental science, invertebrate zoology, and related fields. The First Edition has been widely used as a textbook and this Second Edition should continue to serve students in advanced classes. The Second Edition features expanded and updated chapters, especially with respect to the cited references and the classification of North American freshwater invertebrates. New chapters or substantially revised chapters include those on freshwater ecosystems, snails, aquatic spiders, aquatic insects, and crustaceans.

Ecology and Classification of North American Freshwater Invertebrates, Second Edition, is the most up-to-date and informative text of its kind. Written by experts in the ecology of various invertebrate groups, coverage emphasizes ecological information within a current taxonomic framework. Each chapter contains both morphological and taxonomic information, including keys to North American taxa (usually to the generic level) as well as bibliographic information and a list of further readings. The text is geared toward researchers and advanced undergraduate and graduate students.

Audience: Advanced undergraduates, graduate students, researchers, faculty and staff at universiities and consulting companies interested in freshwater biology and ecology, limnology, envionmental science, invertebrate zoology and related fields.

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Editorial Reviews

Booknews
Researchers with and without affiliation to an academic institution from the US, Canada, and Australia freshen the first edition (no date noted) with updated literature references, new coverage of invertebrate biology and ecology, and extensive revisions to taxonomy and classification. Some authors have altered figures and introduced more detailed taxonomic keys, which are intended to allow an average, nonspecialist reader to identify an organism with reasonable assurance. Generally insects are still not covered, for the sake of space, but a new article reviews them briefly. Also ignored or barely mentioned are groundwater, estuarine, and tropical aquatic invertebrates. Annotation c. Book News, Inc., Portland, OR (booknews.com)
From the Publisher
Review of the First Edition
"This is a book by biologists for biologists, constructed with care, professionalism and detail ... it will be a valuable reference in several of our biology courses such as limnology, ecology and invertebrate biology."
- Quarterly Review of Biology
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Product Details

  • ISBN-13: 9780126906455
  • Publisher: Elsevier Science & Technology Books
  • Publication date: 8/28/1991
  • Edition description: Older Edition
  • Edition number: 1
  • Pages: 911
  • Product dimensions: 8.85 (w) x 11.26 (h) x 1.68 (d)

Read an Excerpt

Ecology and Classification of North American Freshwater Invertebrates


Academic Press

Copyright © 2010 Elsevier Inc.
All right reserved.

ISBN: 978-0-08-088981-8


Chapter One

Introduction to Invertebrates of Inland Waters

James H. Thorp Kansas Biological Survey and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, Kansas

Alan P. Covich Institute of Ecology, Odum School of Ecology, University of Georgia, Athens, Georgia

Walter W. Dimmick Kansas Biological Survey, and Department of Ecology and Evolutionary Biology, University of Kansas, Larence, Kansas

I. Introduction

II. Species and Phylogenies A. Species and Concepts of Species B. Demographic Exchangeability C. The Role of Phylogenies in Studies of Ecology and Behavior D. Phylogenetic Trees

III. Taxonomy and Classification

IV. Synopses of the Invertebrates of North American Inland Waters A. Protozoa (Chapter 3) B. Porifera (Chapter 4) C. Cnidaria (Chapter 5) D. Flatworms: Turbellaria and Nemertea (Chapter 6) E. Gastrotricha (Chapter 7) F. Rotifera (Chapter 8) G. Nematoda and Nematomorpha (Chapter 9) H. Mollusca (Chapters 10–11) I. Annelida (Chapter 12 J. Bryozoa (Chapter 13) K. Tardigrada (Chapter 14) L. Arthropoda (Chapters 15–22)

V. Taxonomic Key to Major Invertebrate Fauna of Inland Waters

VI. Selected References

I. INTRODUCTION

At some point in almost every biologist's life, an invertebrate stimulated their curiosity. It might have started when they peered through a microscope at pond water and saw a protozoan, hydra, rotifer, or some other creature. Or perhaps they watched a butterfly or bee pollinating a flower, a rolly-polly pill bug curled in a ball within their palm, ants marching rapidly past while carrying heavy loads, waving anemones within a tide pool, or a crayfish scurrying from under a stream rock. For many authors contributing to this book, this childhood fascination led progressively, if not inevitably, to a life-long career in science.

Aquatic scientists focusing on invertebrates conduct research in a wide diversity of fields. Some are fascinated by invertebrate variety and the relationships among species over evolutionary history, or they may be involved in conducting environmental assessments where knowledge of invertebrate identification is typically essential. Others seek to control human diseases by understanding and controlling invertebrate vectors of water-borne diseases, or perhaps they study the population biology or culturing of invertebrates involved in the food chains from which we derive many items, including freshwater crayfish and the zooplankton prey of trout and largemouth bass. Many more investigate the ecology of invertebrates to satisfy their scientific curiosity or to help abate environmental crises facing the natural and human world from future global climate change to more immediate and local environmental perturbations.

Next to their more colorful, and often larger, marine relatives, freshwater invertebrates may initially seem drab and uninspiring. Yet once the curious observer penetrates beyond superficial appearances and thoroughly examines the diverse structural, physiological, behavioral, and general ecological adaptations of freshwater invertebrates, few fail to be impressed by these fascinating animals. In this book, students and professionals alike will be exposed to new aspects of the biology, ecology, and classification of freshwater and other inland aquatic invertebrates. The authors of this book have reviewed the recent literature and drawn together some of the most important highlights associated with these diverse organisms. In this edition, we have also included new images and color plates to illustrate the diversity of forms and function.

This chapter, in particular, serves as a very brief introduction to freshwater invertebrates of Canada and the United States. Following a short discussion of procedures for naming and classifying organisms, we briefly describe the taxonomic groups covered in Chapters 3–22. We also include a taxonomic key to help the reader begin the process of classifying freshwater invertebrates. This dichotomous key will lead to the appropriate chapter for more detailed biological and taxonomic information. Additional information on freshwater invertebrates can be found in various texts on both invertebrate zoology and aquatic ecology.

II. SPECIES AND PHYLOGENIES

The identification of natural units is one of the major guiding principles for biologists that endeavor to study, discover, and document the world's biodiversity. A natural unit of biodiversity is defined here as a unit that results from evolution. Examples of natural units of biodiversity are populations, species, and monophyletic groups of species. Natural units that are given a formal name (e.g., species) are called natural taxa. In contrast, subspecies is an example of a taxonomic unit that is often not a natural unit but rather a convenient partition of geographic variation. Because the number of animal species is enormous and the number of biologists studying them is minuscule in comparison, it is not surprising that our poor understanding of many genera, tribes, and families would frequently result in groups that are not natural taxa.

The principal intellectual tools needed to discover natural taxa have emerged from the disciplines of systematic biology and population genetics. Species concepts and methods for constructing and evaluating phylogenetic trees are central to systematic biology. The discipline of population genetics is important because it permits direct study of the degree of connectivity between populations. Studies of molecular variation enable us to discover the existence of species that are undetectable when we restrict our data to morphological characters. This has resulted in the recognition of multiple species that were formerly thought to be a single wide-ranging species.

Many biologists disagree about the best species concept and which methods of phylogenetic construction are most reliable. While this may seem to be an inconvenient situation for a new student or a researcher who is primarily interested in ecological or behavioral studies, an informed viewpoint about species concepts and phylogenetics is prerequisite for any serious student of freshwater invertebrates. Because of the extensive loss of habitat due to anthropogenic disturbances and the impending wide-scale ecological disruptions from global climate change, extinction is likely for an enormous number of species. Freshwater species could be at the leading edge of the forthcoming storm of extinction, and thus it is more important than ever to underpin ecological studies with a robust understanding of the natural units of biodiversity which we label, or sometimes mislabel, with taxonomic names. The following two sections present a brief introduction to some of the important implications of using different species concepts and the critical importance of phylogenetic trees.

A. Species and Concepts of Species

Students of invertebrate zoology are occasionally confronted with the daunting prospect of identifying specimens to the level of species. Unfortunately, the intellectual basis for taxonomic decisions at the species level is sometimes questionable. Freshwater invertebrates are an interesting and difficult group of organisms because of their great biological diversity and a dearth of genetic studies of wide-ranging species. Informed decisions about the validity of a species requires an understanding of which species concept was used to label the group of organisms collected at a particular place and time.

Species are the result of historical natural processes. Anagenesis is the modification of lineages through mutation, gene flow, natural selection, and random genetic drift. Speciation is the creation of a new lineage by splitting a preexisting lineage or the result of hybridization between two preexisting lineages. Clearly, evolution is a phenomenon of lineages, and these lineages are called species by evolutionary biologists. Therefore, the first logical step to understanding current and past biodiversity is the identification of species and other natural units that result from evolution.

Because species are the products of evolution, their importance as units of biodiversity is paramount. Scientists often need to identify units of biodiversity below the species level, but ultimately definitions of these units must be cast in the light of an appropriate species concept because species serve as the ultimate frame of reference for studies of population variation. Species concepts play a critical role in the interpretation of intraspecific variation because species as natural taxa provide an upper boundary for comparisons among different populations. Whether a particular population or group of populations is distinctive enough to be recognized as a species has been a key issue in many taxonomic and conservation disputes. An understanding of what species are and how they can be identified is required to interpret studies of intraspecific variation and formulate biologically meaningful policies for identifying natural units of biodiversity.

The scientific literature about the nature of species and the best method of identifying species is enormous and contentious. Perhaps, the large quantity and legitimate controversies can even be considered a barrier to understanding for students, professional biologists, and policymakers. As an intellectual framework for understanding and organizing the many different concepts of species, it is useful to consider that they almost always fall into one of two different categories: operational species concepts or ontological species concepts. Operational species concepts provide a researcher with specific criteria, that is, an algorithm to implement in order to determine whether or not two different populations belong to the same species. The biological species concept of Mayr is a classic example of an operational species concept. The operation used by Mayr's biological species concept is the discovery of barriers to sexual reproduction that are assumed to define the boundaries of species. Ontological species concepts provide a theoretical definition of what a species is but do not specify a methodology for the identification of species. The evolutionary species concept of Wiley is an example of an ontological species concept. In this case, species are defined as lineages expected to persist through time, but no method (operation) is prescribed for the discovery of these lineages. In more common parlance, ontological concepts can be understood as theoretical definitions of what species are. Operational species concepts provide only a method of how to discover species and are, by definition, limited by their particular methodology.

Below you will find brief definitions of the biological, phylogenetic, cohesion, and evolutionary species concepts along with comments on their strengths and limitations. These concepts have all been influential and provide a good basis for an entry-level understanding of the many important issues regarding concepts of species. For a more thorough discussion and evaluation of species concepts, we recommend a careful reading of an article by Mayden and Wood.

1. Biological Species Concept

Definition

Species are groups of actually or potentially interbreeding populations which are reproductively isolated from other such groups.

The biological species concept has been prevalent in the evolutionary literature for the last several decades and is emphasized in many college-level biology courses. It is probably the species concept most familiar to biologists in diverse fields, such as conservation biology, forestry, fisheries, and wildlife management. Species defined by the biological species concept have also been championed as units of conservation.

Theodosius Dobzhansky, a prominent evolutionary geneticist and an important contributor to the modern evolutionary synthesis, characterized the concept of a biological species as a system of populations. The gene exchange between these systems (species) is limited or prevented by reproductive isolating mechanisms, such as species-specific breeding behaviors, hybrid sterility, and gametic incompatibility. Thus, under the biological species concept, species are simultaneously a reproductive community, a gene pool, and a genetic system. The study of reproductive isolating mechanisms is central to the biological species concept because these mechanisms provide barriers to gene flow that define the boundaries of the reproductive community and gene pool, and preserve the integrity of the genetic system of the species. In practice, however, isolating mechanisms are rarely studied and species are usually diagnosed by differences in phenotypic (morphological) features.

Despite the long historical acceptance of the biological species concept, it has become controversial because a growing number of evolutionary biologists have found the biological species concept unworkable in a wide variety of situations. Critics of the biological species concept come from the fields of both botany and zoology. A fundamental drawback to this concept is that it is exclusively defined in terms of sexual reproduction. Asexual taxa are obviously excluded from this concept, but it is also true that many species capable of sexual reproduction cannot be easily accommodated within the framework of the biological species concept. From the viewpoint of population genetics, species capable of self-fertilization (e.g., parasitic tapeworms and some plants) and those with mandatory sibling mating are more similar to asexual than to sexually outcrossing species. Species that freely hybridize (open mating systems) with one or more other species yet maintain their evolutionary identity as species also provide a serious challenge to the validity of the biological species concept. Groups of freely hybridizing species are known from plants, insects, and vertebrates.

Another important limitation of the biological species concept concerns speciation. The most widely accepted model of speciation is the allopatric model. Generally speaking, the allopatric model entails the geographic subdivision of a single population followed by the differentiation of the isolated subpopulations into new species. Historically, the notion of a correlation between geographic subdivision of populations and speciation grew out of the observation that the closest relatives tend to occupy separate but contiguous geographic areas. Thus, in allopatric speciation lineage independence is achieved when two or more lineages are geographically disjunct. Therefore, isolating mechanisms which are fundamental to the biological species concept have very little, if anything, to do with the process of speciation because the populations undergoing speciation are geographically disjunct from one another. Hence, the evolutionary forces responsible for allopatric speciation have nothing to do with the isolating mechanisms that are a fundamental aspect of the biological species concept. A species concept that fundamentally fails to illuminate the process of speciation cannot provide the intellectual framework for the identification of units of biodiversity. Because it is impossible to study gene flow and reproductive behavior of species known only from fossil remains, the biological species concept cannot be applied to the thousands of species known only from their fossils.

(Continues...)



Excerpted from Ecology and Classification of North American Freshwater Invertebrates Copyright © 2010 by Elsevier Inc.. Excerpted by permission of Academic Press. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.
Excerpts are provided by Dial-A-Book Inc. solely for the personal use of visitors to this web site.

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Table of Contents

1.Introduction To Invertebrates Of Inland Waters
2.An Overview Of Inland Water Habitats
3.Protozoa
4.Porifera
5.Cnidaria
6.Flatworms: Turbellarians And Nemertea
7.Gastrotricha
8.Rotifera
9.Nematoda And Nematomorpha
10.Mollusca: Gastropoda
11.Mollusca: Bivalvia
12.Annelida (Clitellata): Oligochaeta, Branchiobdellida,Hirudinida, And Acanthobdellida
13.Bryozoans
14.Tardigrada
15.Water Mites (Hydrachnidiae) And Other Arachnids
16.Diversity And Classification Of Insects And Collembola
17.Aquatic Insect Ecology
18.Introduction To The Subphylum Crustacea
19.Ostracoda
20.Cladocera And Other Branchiopoda
21.Copepoda
22.Decapoda

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