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Author: Jean Clobert
Publisher: OUP Oxford
ISBN: 0191640360
Category : Science
Languages : en
Pages : 496
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Book Description
Now that so many ecosystems face rapid and major environmental change, the ability of species to respond to these changes by dispersing or moving between different patches of habitat can be crucial to ensuring their survival. Understanding dispersal has become key to understanding how populations may persist. Dispersal Ecology and Evolution provides a timely and wide-ranging overview of the fast expanding field of dispersal ecology, incorporating the very latest research. The causes, mechanisms, and consequences of dispersal at the individual, population, species, and community levels are considered. Perspectives and insights are offered from the fields of evolution, behavioural ecology, conservation biology, and genetics. Throughout the book theoretical approaches are combined with empirical data, and care has been taken to include examples from as wide a range of species as possible - both plant and animal.
Author: Jean Clobert
Publisher: OUP Oxford
ISBN: 0191640360
Category : Science
Languages : en
Pages : 496
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Book Description
Now that so many ecosystems face rapid and major environmental change, the ability of species to respond to these changes by dispersing or moving between different patches of habitat can be crucial to ensuring their survival. Understanding dispersal has become key to understanding how populations may persist. Dispersal Ecology and Evolution provides a timely and wide-ranging overview of the fast expanding field of dispersal ecology, incorporating the very latest research. The causes, mechanisms, and consequences of dispersal at the individual, population, species, and community levels are considered. Perspectives and insights are offered from the fields of evolution, behavioural ecology, conservation biology, and genetics. Throughout the book theoretical approaches are combined with empirical data, and care has been taken to include examples from as wide a range of species as possible - both plant and animal.
Author: Michael A. Steele
Publisher: Johns Hopkins University Press
ISBN: 1421439018
Category : Science
Languages : en
Pages : 480
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Book Description
Theimer, an accomplished ecologist.
Author: L. van der Pijl
Publisher: Springer Science & Business Media
ISBN: 3642961088
Category : Nature
Languages : en
Pages : 171
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Book Description
Reviewers from diverse branches of botany have exerted pressure to have chapters dealing with their field extended. If only to cover his incompetence, the author could not accede to these requests. Nor was it possible to respond to Eastern European urgings to extend the classificatory terminology, especially in ChapterX. He is grateful for indications of factual shortcomings in the chosen field, especially for those by Dr. RUDOLF SCHMID (Ann Arbor), who provided exten sive comment. L. VAN DER PIlL The Hague, spring 1972 Preface to the First Edition The work offered here is a companion volume to the work by K. FAEGRI and 1. VAN DER PIJL, Principles of Pollination Ecology, whim. deals with the preced ing phase of reproduction in plants. In the present work too, the emphasis is on principles and ecology. It is neither an enumeration of mechanisms, nor a compilation of cases. RIDLEY'S monumental work The Dispersal of Plants Throughout the World comprises 700 large pages of small print, and research has proceeded since then. Though this work is more than just a compilation and contains much insight and thoughts on principles in addition to reviews, its completeness hinders its use as a text book. As a reference work, it is unsurpassed and the writer made frequent use of it. The writer paid special attention to functional backgrounds for the use of taxonomists working with "characters" and to biosystematics at the macro-level.
Author: N.C. Stenseth
Publisher: Springer Science & Business Media
ISBN: 9401123381
Category : Science
Languages : en
Pages : 359
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Book Description
4.1.1 Demographic significance Confined populations grow more rapidly than populations from which dispersal is permitted (Lidicker, 1975; Krebs, 1979; Tamarin et at., 1984), and demography in island populations where dispersal is restricted differs greatly from nearby mainland populations (Lidicker, 1973; Tamarin, 1977, 1978; Gliwicz, 1980), clearly demonstrating the demographic signi ficance of dispersal. The prevalence of dispersal in rapidly expanding populations is held to be the best evidence for presaturation dispersal. Because dispersal reduces the growth rate of source populations, it is generally believed that emigration is not balanced by immigration, and that mortality of emigrants occurs as a result of movement into a 'sink' of unfavourable habitat. If such dispersal is age- or sex-biased, the demo graphy of the population is markedly affected, as a consequence of differ ences in mortality in the dispersive sex or age class. Habitat heterogeneity consequently underlies this interpretation of dispersal and its demographic consequences, although the spatial variability of environments is rarely assessed in dispersal studies.
Author: Tatyana A. Lobova
Publisher: New York Botanical Garden Press
ISBN:
Category : Nature
Languages : en
Pages : 538
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Book Description
This book provides a comprehensive treatment of all known bat-dispersed plants in the New World tropics and covers a total of 549 species in 191 genera from 62 plant families. It places a special emphasis on the flowering plants and bat fauna of the relatively undisturbed forests of central French Guiana. In particular, detailed descriptions of 112 bat-dispersed species from that area are complemented by color photographs that will help other researchers identify fruits and seeds throughout the Neotropics. Going beyond merely describing these species, the authors compare and analyze the diverse traits of plants dispersed by bats to reexamine bat preferences of some fruiting plants over the others, a phenomenon known as the "bat-fruit syndrome." The seed dispersers too are given ample treatment, with descriptions of the foraging ecology and feeding behaviors of the 37 fruit-eating bats found in central French Guiana. The monograph includes complementing appendices that allow the reader to determine all bat species reported to feed on the fruits of a particular plant and all fruiting plants in the diet of a particular bat species. It summarizes decades of research on bat-plant interactions from many parts of the Neotropics, providing a stimulus for further ecological and evolutionary studies--
Author: B. Diane Chepko-Sade
Publisher: University of Chicago Press
ISBN: 0226102688
Category : Nature
Languages : en
Pages : 361
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Book Description
Mammalian Dispersal Patterns examines the ways that social structure affects population genetics and, in turn, rates of evolution, in mammalian groups. It brings together fieldwork in animal behavior and wildlife biology with theoretical work in demography and population genetics. The focus here is dispersal—whether, how, and when individuals leave the areas where they are born. Theoretical work in population genetics indicates that such social factors as skewed sex ratios, restrictive mating patterns, and delayed age of first reproduction will lower the reproductive variability of a population by reducing the number of genotypes passed from one generation to the next. Field studies have shown that many mammalian species do exhibit many such social characteristics. Among horses, elephant seals, and a number of primates, the majority of females are inseminated by only a fraction of the males. In pacts of wolves and mongooses, usually only the highest-ranking male and female breed in a given season. Although socially restricted mating tends to lower genetic variability in isolated populations, it actually tends to increase genetic variability in subdivided populations with low rates of migration between subunits. Among some species there is little dispersal and thus little gene flow between subpopulations; other species travel far afield before mating. The contributors to this volume examine actual data from populations of mammals, the way patterns of dispersal correlate with the genetic structure of individuals and populations, and mathematical models of population structure. This interdisciplinary approach has an important bearing on work in conservation of both wildlife and zoo populations, for it shows that the home range and the population size needed to maintain genetic variability can differ greatly from one species to the next. The volume also offers a fruitful model for future research.
Author: David R. Murray
Publisher: Academic Press
ISBN: 0323139884
Category : Science
Languages : en
Pages : 337
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Book Description
Seed Dispersal focuses on the mechanics and processes involved in seed dispersal, including its implications in ecology, animal behavior, plant and animal biogeography, speciation, and evolution. The selection first elaborates on the aerial motion of seeds, fruits, spores, and pollen and seed dispersal by water. Discussions focus on seed dispersal by rain, river, and flood, effective seed dispersal by ocean currents compared to other vectors, aerodynamic forces and their effects, and launching and release mechanisms. The text then takes a look at seed dispersal syndromes in Australian Acacia, including inference of dispersal syndromes, seed dispersal syndromes, ecological consequences of seed dispersal, and evolutionary derivation of dispersal syndromes. The publication ponders on seed dispersal by fruit-eating birds and mammals, rodents as seed consumers and dispersers, and seed dispersal in relation to fire. Topics include fire as a dispersal vector, long distance dispersal, granivorous rodents and the fates of seeds, determinants of the fate path, population ecology of seed dispersal, and foraging for fruits. The selection is a valuable reference for researchers interested in the factors involved in seed dispersal.
Author: Andrew J. Dennis
Publisher: CABI
ISBN: 1845931661
Category : Technology & Engineering
Languages : en
Pages : 704
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Book Description
Fresh concepts in the study of seed dispersal are spurring a host of exciting new questions, new answers to old questions, new methods and approaches, and a reinvigoration of the field.Seed Dispersal: Theory and its Application in a Changing World presents both recent advances and reviews of current knowledge demonstrating the vigour and vibrancy of the field. It provides new perspectives and directions at a time when efforts to meet growing environmental challenges threatening natural systems are of utmost importance.
Author: Rafi Segal
Publisher: Academy Press
ISBN:
Category : Architecture
Languages : en
Pages : 148
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Book Description
Questioning the traditional boundaries between cities, suburbs, countryside and wilderness, this issue of AD explores emergent types of public space in low-density environments. It describes this new form of urbanism: decentralised, in a constant process of expansion and contraction, not homogenous or necessarily low-rise, nor guided by one mode of development, typology or pattern. While functionally and programmatically dispersed, settlements operate as a form of urbanism; the place of collective spaces within them has yet to be defined and articulated. The physical transformation of the built environment on the one hand, and the change in our notion of the public on the other - due to globalisation, privatisation and segregation - call for renewed interpretations of the nature and character of public space. The concept of public space needs to be examined: replaced, re-created or adapted to fit these conditions. What is the place of the public in this form of urbanism, and how can architecture address the notion of common, collective spaces? What is the current sociopolitical role o such spaces? How does the form and use of these spaces reflect the conception of the public as a political (or non-political) body? And can architecture regain an active role in formulating the notion of the collective? These and other issues are addressed through essays, research projects and built work by distinguished writers such as Bruce Robbins, Albert Pope and Alex Wall, and Practitioners including Zvi Hecker, Vito Acconci, MUTOPIA, Manuel de Sola-Morales, Martha Rosler and Manuel Vicente in a search for new collective architectures within the dispersed city.
Author: Elena Gorb
Publisher: Springer Science & Business Media
ISBN: 9401701733
Category : Science
Languages : en
Pages : 246
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Book Description
Countless ants transport and deposit seeds and thereby influence the survival, death, and evolution of many plant species. In higher plants, seed dispersal by ants (myrmecochory) has appeared many times independently in different lineages. More than 3000 plant species are known to utilize ant assistance to be planted. Myrmecochory is a very interesting and rather enigmatic form of mutualistic ant-plant associations. This phenomenon is extremely complex, because there are hundreds of ant species connected with hundreds of plant species. This book effectively combines a thorough approach to investigating morphological and physiological adaptations of plants with elegant field experiments on the behaviour of ants. This monograph is a first attempt at collecting information about morphology, ecology and phenology of ants and plants from one ecosystem. The book gives readers a panoramic view of the hidden, poorly-known interrelations not only between pairs of ants and plant species, but also between species communities in the ecosystem. The authors have considered not just one aspect of animal-plant relationships, but have tried to show them in all their complexity. Some aspects of the ant-plant interactions described in the book may be of interest to botanists, others to zoologists or ecologists, but the entire work is an excellent example of the marriage of these biological disciplines.
