05444nam a2200349Ii 4500003001000000005001700010006001900027008004100046017006400087020003900151040030200190082001400492245010400506246008300610264005400693300008200747336003000829337003000859338002400889500001400913500001100927504002900938505135600967520250202323521010004825526003504925526002704960526001704987526004705004526002805051546001505079PE-TmUNAS20250110132945.0a||||fr|||| 00| 0 250110b        |||||||| |||| 00| 0 eng d  aCataloging in Publication Data.dBiblioteca Nacional London  a0-60-046328-7qAgencia ISBN London  aBiblioteca Central de la Universidad Nacional Agraria de la Selvabspaccatalogación de la Universidad Nacional Agraria de la Selva, transcrita por la Universidad Nacional Agraria de la Selva, sin modificaciones posterioresdBiblioteca Central de la Universidad Nacional Agraria de la Selvaerda  222a574.510aElemnts of Ecology and Field Biology /cRobert Leo Smith. Production Supervisor : Kewal K. Sharma.   5Universidad Nacional Agraria de la SelvaaElemnts of Ecology and Field Biology  aNew York - LondonbHarper & Row, Publishersc1977  avii-xii, 497 p.bilus, blanco y negro; figuras balnco y negro, table.c23 cm.  2rdacontentatexto impreso  2rdamediaasin mediación  2rdacarrieravolumen  aContents.  aIndex.  aBibliography 459- 497 p.  a                                CONTENTS : 
      PART I .- INTRODUCTION.
               1.- Ecology and the Ecosystem.
               2.- Natural Selection and Speciation.
     PART II .- THE ECOSYSTEM.
               3.- Energy Flow in Ecosystems.
               4.- Biogechemical Cycles.
               5.- Man And Biochemical Cycles.
               6.- Environmental Influences.
               7.- The Ecosystem and the Community.
               8.- Ecosystem Development.
    PART III .- POPULATIONS.
               9.- Population Characteristics, Growth, and Regulation.
             10.- Relation Among Populations.
    PART IV.- A Diversity of Ecosystems.
                     Aquatic Ecosystems - Freshwater.
              11.- Lakes and Ponds.
              12.- Marshes, Swamps, and Bogs.
              13.- Flowing Waters.
                     AQUQTIC ECOSYSTEMS - MARINE
              14. Some Characteristics of the Marine Environment.
              15.- Estuaries, Tidal Marshes, and Swamps.
              16.- The Seashore.
              17.- The Open Sea.
                      TERRESTRIAL ECOSYSTEMS.
              18.- Didtribution of Terrestrial Communities.
              19.- Life in the Soil.
              20.- Grasslands.
              21.- Shrublands and Deserts.
              22.- The Tundra.
              23.- The Forest.  a                                            PREFACE :
     In spite of the variety of ecological texts available, most of which are larg and imposing (including my own Ecology and Field Biology, second edition), a need still exists for a maller descriptive text that presents the concepts of ecology, gives a feel for the subject matter, is relatively easy to understand, and is short enough to be used in a one-semester course.
     Elements of Ecology and Field Biology is divided into four parts. PART I.- is introductory. Chapter 1 Provides an introduction or abstract of what is to come , gives a very brief introduction to systems analysis and homeostasis, and sets the ecosystem theme of the book. Chapter 2 is and introductionto evolutionary ecology and establishes the secondary  evolutionary theme that runs through the book.
PART II loks at the ecosystem from energy flow and biogeochimical cycles, including man's intervention into them, to enviromental influences, community structure, and ecosystem development. Although the organization inthis sectionis the same as that of ecology and Field Biology , second edition, readers of the latter will discover that some major changes have been made in this text.
    PART III covers population. Chapter 9 is concemed with natality , mortality, age structure , population growth, and relationships among individual members of the populatio. Chapter 10 deals with predation, competition, and other interactions among members of population of different species. Much of this material has been revise from Ecology and Field Biology , second edition, with new material and illustrations added.
    PART IV is a retum to the emphasis placed on ecosystems in the firts edition of Ecology and Field Biology . The material has been reorganizad and expanded with emphasis on structure and function. Chapter 11, 12, and 13 consider freshwater ecosystems Chapter 14, 15, 16, and 17 are on marine ecosystems.. terrestrial ecosystems follow with Chapter 18 providing an oviview of ecosystem distribution, Following this are chapters on grasslands, shrubland and deserts, tundra, and forets.
     How the instructor uses this book is up to the individual, for no one ecology course is taught in the same manner as another. The book even though relatively short, should be flexible enough to meet the requirements of any introductoory course. To aid in its classroom use I have prepared an instructor's manual to accompany the book...(Robert Leo Smith)..  aMaterial bibliográfico para estudiantes universitarios, docentes e investigadores.bPE-TmUNAS  iRecursos Naturales Renovables.  iIngeniería Forestal.  iAgronomía.  iIngeniería Conservación Suelos y Agua.  iIngeniería Ambiental.  aEn ingles.