CANADIAN JOURNAL OF ZOOLOGY

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Canadian Journal Of Zoology

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ISBN : MINN:31951P01129665R
Genre : Electronic journals
File Size : 41.39 MB
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Category: Electronic journals

The Beaver

Author : Dietland Müller-Schwarze
ISBN : 080144098X
Genre : Nature
File Size : 67.25 MB
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Beavers can and do dramatically change the landscape. The beaver is a keystone species—their skills as foresters and engineers create and maintain ponds and wetlands that increase biodiversity, purify water, and prevent large-scale flooding. Biologists have long studied their daily and seasonal routines, family structures, and dispersal patterns. As human development encroaches into formerly wild areas, property owners and government authorities need new, nonlethal strategies for dealing with so-called nuisance beavers. At the same time, the complex behavior of beavers intrigues visitors at parks and other wildlife viewing sites because it is relatively easy to observe.In an up-to-date, exhaustively illustrated, and comprehensive book on beaver biology and management, Dietland Müller-Schwarze and Lixing Sun gather a wealth of scientific knowledge about both the North American and Eurasian beaver species. The Beaver is designed to satisfy the curiosity and answer the questions of anyone with an interest in these animals, from students who enjoy watching beaver ponds at nature centers to homeowners who hope to protect their landscaping. Photographs taken by the authors document every aspect of beaver behavior and biology, the variety of their constructions, and the habitats that depend on their presence. Beaver facts:•Just as individual beavers shape their immediate surroundings, so did the distribution of beavers across North America influence the paths of English and French explorers and traders. As a result of the fur trade, beavers were wiped out across large areas of the United States. Reintroduction efforts led to the widespread establishment of these resilient animals, and now they are found throughout North America, Europe, and parts of the southern hemisphere.•Beaver meadows provided early settlers with level, fertile pastures and hayfields.•Based on the fossil record, the smallest extinct beaver species were the size of a muskrat, and the largest may have reached the size of a black bear (five to six times as large as today's North American beavers). Beaver-gnawed wood has been found alongside the skeleton of a mastodon.•Some beavers remain in the home lodge for an extra year to assist their parents in raising younger siblings. They feed, groom, and guard the newborn kits.•In 1600, beaver ponds covered eleven percent of the upper Mississippi and Missouri Rivers' watershed above Thebes, Illinois. Restoring only 3 percent of the original wetlands might suffice to prevent catastrophic floods such as those in the early 1990s.
Category: Nature

A Functional Biology Of Parasitism

Author : G.W. Esch
ISBN : 9789401123525
Genre : Science
File Size : 62.19 MB
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Series Editor: Peter Calow, Department of Zoology, University of Sheffield, England The main aim of this series will be to illustrate and to explain the way organisms 'make a living' in nature. At the heart of this - their functional biology - is the way organisms acquire and then make use of resources in metabolism, movement, growth, reproduction, and so on. These processes will form the fundamental framework of all the books in the series. Each book will concentrate on a particular taxon (species, family, class or even phylum) and will bring together information on the form, physiology, ecology and evolutionary biology of the group. The aim will be not only to describe how organisms work, but also to consider why they have come to work in that way. By concentration on taxa which are well known, it is hoped that the series will not only illustrate the success of selection, but also show the constraints imposed upon it by the physiological, morphological and developmental limitations of the groups. Another important feature of the series will be its organismic orientation. Each book will emphasize the importance of functional integration in the day to-day lives and the evolution of organisms. This is crucial since, though it may be true that organisms can be considered as collections of gene determined traits, they nevertheless interact with their environment as integrated wholes and it is in this context that individual traits have been subjected to natural selection and have evolved.
Category: Science

Treatise On Zoology Anatomy Taxonomy Biology The Gregarines 2 Vols

Author : Isabelle Desportes
ISBN : 9789004256057
Genre : Science
File Size : 45.77 MB
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Gregarines are apicomplexans and exclusively parasites of invertebrates. After the basic publication in the Traité de Zoologie by Grassé in 1953, this second edition is proposed to update the knowledge with information provided by new technologies such as electron microscopy, biochemistry and molecular biology and to enlighten their high diversity of adaptation to invertebrate hosts living in a diversity of biotopes. Morphological features, life cycles, host-parasite interactions and taxonomical data are most informative for the understanding of the evolution of the phylum Apicomplexa.
Category: Science

The Behaviour Of Teleost Fishes

Author : Tony J. Pitcher
ISBN : 9781468482614
Genre : Juvenile Nonfiction
File Size : 47.81 MB
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This book is about the behaviour of teleosts, a well-defined, highly successful, taxonomic group of vertebrate animals sharing a common body plan and forming the vast majority of living bony fishes. There are weH over 22000 living species of teleosts, including nearly all those of importance in com mercial fisheries and aquaculture. Teleosts are represented injust about every conceivable aquatic environment from temporary desert pools to the deep ocean, from soda lakes to sub-zero Antarctic waters. Behaviour is the primary interface between these effective survival machines and their environment: behavioural plasticity is one of the keys to their success. The study of animal behaviour has undergone revolutionary changes in the past decade under the dual impact of behavioural ecology and sociobiology. The modern body of theory provides quantitatively testable and experi mentaHy accessible hypotheses. Much current work in animal behaviour has concentrated on birds and mammals, animals with ostensibly more complex structure, physiology and behavioural capacity, but there is a growing body of information about the behaviour of fishes. There is now increasing awareness that the same ecological and evolutionary rules govern teleost fish, and that their behaviour is not just a simplified version of that seen in birds and mammals. The details of fish behaviour intimately reflect unique and efficient adaptations to their three-dimensional aquatic environment.
Category: Juvenile Nonfiction

Bobcat

Author : Kevin Hansen
ISBN : 9780199884728
Genre : Nature
File Size : 83.66 MB
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Bobcat: Master of Survival tells the story of the most adaptable and resilient wild feline in the world. While half the wild cat species worldwide are in danger, the bobcat is thriving, even expanding its range in North America. Why are bobcats flourishing when so many other wild felines are advancing towards extinction? The book explains how scientists apply the latest in wildlife research technology to probe this diminutive predator's habits and behavior. The reader is invited inside the bobcat's world to see how they hunt, kill prey, raise their young, coexist with humans, and deftly navigate the endless obstacles to survival. The bobcat is both the most studied and the most exploited wild feline in the world. Millions have been killed for the fur trade. They were the focus of major controversy in the 1970s that transformed international conservation of wild felines. The book discusses how economics and politics play a far greater role in bobcat management and conservation than does science. Bobcat is the most comprehensive and up-to-date book on the natural history and management of bobcats to appear in 40 years.
Category: Nature

Fish Physiology Recent Advances

Author : Stefan Nilsson
ISBN : 9789401165587
Genre : Juvenile Nonfiction
File Size : 82.49 MB
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Fishes are very successful vertebrates and have adapted to a wide range of environmental conditions, from the deep ocean to the smallest brook or pond. The physiological background to these environmental adaptations is, obviously, far from clear, and provides fish physiologists with many challenges. The number of extant fish species has been estimated to be in excess of 20000, and only relatively few of these have been subject to physiological studies. Yet among these animals can be found many physiological systems different from those of the land-dwelling vertebrates, and also systems similar to those of the 'higher' vertebrates but at a different level of phylogenetic development. Apart from the rapidly increasing interest in basic fish physi ology, the last few years have seen a dramatic increase in applied research, aimed primarily in two directions: fish culture and envi ronmental toxicology. Physiological research is of vital importance in both these fields, and basic fish physiology is a necessary base for the applied research. This book is intended for a wide readership among senior undergraduate, postgraduate and research students, as well as uni versity teachers and researchers in zoology, physiology, aqua culture and biology generally. The book focuses on five major areas of basic and applied research: haemopoiesis, acid-base regu lation, circulation, gastro-intestinal functions and physiological toxicology. The chapters will serve as introductions to these fields, as well as up-to-date reviews of the most recent advances in the research areas.
Category: Juvenile Nonfiction

Aquatic Entomology

Author : Jill Lancaster
ISBN : 9780191669880
Genre : Science
File Size : 88.25 MB
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Aquatic insects are the dominant invertebrate fauna in most freshwater ecosystems, and figure prominently in the work of a diverse range of researchers, students, and environmental managers. Often employed as indicators of ecosystem health, aquatic insects are also commonly used as model systems to test hypotheses in ecological topics including metapopulation and metacommunity dynamics, recruitment limitation, trophic interactions, and trophic networks. Due to their complex life cycles, aquatic insects must master both terrestrial and aquatic environments, crossing these ecosystem boundaries during different stages of development and reproduction. In this wide-ranging text, life under and on top of the water surface are covered in unusual detail, including the biomechanics of life in water, locomotion underwater and on surface films, gas exchange, physico-chemical stressors, feeding, sensory perception and communication, reproduction, egg-laying and development, and the evolution of aquatic habits. The threatened status of freshwaters around the world, coupled with an expanding population of researchers and managers charged with their well-being, signals the importance of such a book as many individuals seek to understand how insects function in these often challenging physical environments. Interest in freshwaters may never have been higher with ever-increasing conflict between water allocation for human (agricultural) use and conservation. Aquatic Entomology is suitable for graduate students, researchers, and managers interested in the subject from a perspective of either basic or applied ecology. It will also be a valuable supplementary text for courses in limnology or freshwater ecology, entomology, and water resource management.
Category: Science

Handbook Of Vegetable Pests

Author : John L. Capinera
ISBN : 0121588610
Genre : Gardening
File Size : 29.1 MB
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To manage and minimize the adverse impacts of vegetable pests, it is important to identify exactly which pests are afflicting crops. This work provides identification guides, descriptions of pest life history, and pest management recommendations. Illustrated with line drawings, it also includes color plates for insect pest identification.
Category: Gardening

Parasite Insect Interactions

Author : Hilary Hurd
ISBN : 0521644259
Genre : Science
File Size : 21.12 MB
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This volume of Parasitology examines specifically parasite-insect Interaction.
Category: Science