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  • 1
    Online Resource
    Online Resource
    Chicago :University of Chicago Press,
    Keywords: Animals -- Food. ; Electronic books.
    Description / Table of Contents: No detailed description available for "Foraging".
    Type of Medium: Online Resource
    Pages: 1 online resource (626 pages)
    Edition: 1st ed.
    ISBN: 9780226772653
    DDC: 591.5/3
    Language: English
    Note: Intro -- Contents -- Foreword -- Acknowledgments -- 1. Foraging: An Overview -- Part I - Foraging and Information Processing -- 2. Models of Information Use -- 3. Neuroethology of Foraging -- 4. Cognition for Foraging -- Part II - Processing, Herbivory, and Storage -- 5. Food Acquisition, Processing, and Digestions -- 6. Herbivory -- 7. Energy Storage and Expenditure -- Part III - Modern Foraging Theory -- 8. Provisioning -- 9. Foraging in the Face of Danger -- 10. Foraging with Others: Games Social Foragers Play -- Part IV - Foraging Ecology -- 11. Foraging and Population Dynamics -- 12. Community Ecology -- 13. Foraging and the Ecology of Fear -- 14. On Foraging Theory, Humans, and the Conservation of Diversity: A Prospectus -- Contributors -- Literature Cited -- Index.
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  • 2
    Online Resource
    Online Resource
    Cambridge :Cambridge University Press,
    Keywords: Natural selection - Mathematical models. ; Electronic books.
    Description / Table of Contents: In this 2005 book, many topics in natural selection are investigated including co-evolution, speciation, and extinction. It may be described as a book on mathematical Darwinism. Darwin used logical verbal arguments to understand evolution. These arguments are presented here in a mathematical setting useful for both understanding evolution and allowing for prediction as well.
    Type of Medium: Online Resource
    Pages: 1 online resource (402 pages)
    Edition: 1st ed.
    ISBN: 9780511198472
    DDC: 576.80151
    Language: English
    Note: Cover -- Half-title -- Title -- Copyright -- Dedication -- Contents -- Figures -- Preface -- 1 Understanding natural selection -- 1.1 Natural selection -- 1.1.1 Historical perspective -- 1.1.2 As Darwin saw it -- 1.1.3 The Modern Synthesis -- 1.2 Genetical approaches to natural selection -- 1.3 Natural selection as an evolutionary game -- 1.3.1 Game theory and evolution -- 1.3.2 Games Nature plays -- 1.3.3 ESS concept -- 1.3.4 Scope of evolutionary game theory -- 1.4 Road map -- 1.4.1 The simplest problem -- 1.4.2 Vector strategies -- 1.4.3 Evolving systems with resources -- 1.4.4 Multiple G-functions -- 1.4.5 Frequency dynamics -- 1.4.6 Multistage systems -- 1.4.7 Non-equilibrium dynamics -- 2 Underlying mathematics and philosophy -- 2.1 Scalars, vectors, and matrices -- 2.1.1 Elementary operations -- 2.1.1.1 Addition -- 2.1.1.2 Multiplication -- 2.1.1.3 Division -- 2.2 Dynamical systems -- 2.2.1 Difference equations -- 2.2.2 Differential equations -- 2.3 Biological population models -- 2.3.1 A special class of dynamical systems -- 2.3.2 The fitness concept with scalar Fi -- 2.3.3 Continuous versus discrete modeling with scalar fitness -- 2.4 Examples of population models -- 2.4.1 Single-species logistic model -- 2.4.2 Lotka-Volterra models for many species of individuals -- 2.4.3 Leslie model of one prey and one predator -- 2.4.4 Many prey and many predators model -- 2.4.5 Identifying strategies in the Lotka-Volterra model -- 2.4.6 Consumer-resource models -- 2.4.7 Multistage models -- 2.5 Classical stability concepts -- 2.5.1 Equilibrium solutions -- 2.5.2 Asymptotic stability -- 2.5.3 Linearization -- 2.5.4 Equilibrium point stability for linear difference equations -- 2.5.5 Equilibrium point stability for linear differential equations -- 2.5.6 Other situations -- 2.5.7 Non-equilibrium dynamics -- 3 The Darwinian game -- 3.1 Classical games. , 3.1.1 The optimization problem -- 3.1.2 Matrix games -- 3.1.3 Solution concepts: max-min, Nash equilibrium, etc. -- 3.1.4 Continuous games -- 3.2 Evolutionary games -- 3.2.1 Collapsing a population's fitness functions into a single G-function -- 3.2.2 Bauplans, G-functions, and taxonomic hierarchies -- 3.3 Evolution by natural selection -- 3.3.1 Tautology and teleology in Darwinian evolution -- 3.3.2 Darwin's postulates in evolutionary game theory -- 3.3.3 Heritable variation and fitness -- 4 G -functions for the Darwinian game -- 4.1 How to create a G-function -- 4.2 Types of G-functions -- 4.3 G-functions with scalar strategies -- 4.4 G-functions with vector strategies -- 4.5 G-functions with resources -- 4.6 Multiple G-functions -- 4.7 G-functions in terms of population frequency -- 4.8 Multistage G-functions -- 4.9 Non-equilibrium dynamics -- 5 Darwinian dynamics -- 5.1 Strategy dynamics and the adaptive landscape -- 5.2 The source of new strategies: heritable variation and mutation -- 5.3 Ecological time and evolutionary time -- 5.4 G-functions with scalar strategies -- 5.4.1 Mean strategy dynamics -- 5.4.1.1 Large difference in time scales -- 5.4.1.2 Small difference in time scales -- 5.5 G-functions with vector strategies -- 5.6 G-functions with resources -- 5.8 G-functions in terms of population frequency -- 5.9 Multistage G-functions -- 5.10 Non-equilibrium Darwinian dynamics -- 5.11 Stability conditions for Darwinian dynamics -- 5.12 Variance dynamics -- 6 Evolutionarily stable strategies -- 6.1 Evolution of evolutionary stability -- 6.2 G-functions with scalar strategies -- 6.2.1 Population dynamics -- 6.2.2 Ecological stability -- 6.2.3 Evolutionary stability -- 6.2.4 Convergent stability -- 6.2.5 Using G-functions with scalar strategies -- 6.3 G-functions with vector strategies -- 6.3.1 Using G-functions with vector strategies. , 6.4 G-functions with resources -- 6.4.1 Using G-functions with resources -- 6.5 Multiple G-functions -- 6.5.1 Using multiple G-functions -- 6.6 G-functions in terms of population frequency -- 6.6.1 Using G-functions in terms of population frequency -- 6.7 Multistage G-functions -- 6.7.1 Using multistage G-functions -- 6.8 Non-equilibrium Darwinian dynamics -- 6.8.1 Using G-functions with non-equilibrium dynamics -- 7 The ESS maximum principle -- 7.1 Maximum principle for G-functions with scalar strategies -- 7.2 Maximum principle for G-functions with vector strategies -- 7.3 Maximum principle for G-functions with resources -- 7.4 Maximum principle for multiple G-functions -- 7.5 Maximum principle for G-functions in terms of population frequency -- 7.6 Maximum principle for multistage G-functions -- 7.7 Maximum principle for non-equilibrium dynamics -- 8 Speciation and extinction -- 8.1 Species concepts -- 8.2 Strategy species concept -- 8.2.1 Species archetypes -- 8.2.2 Definition of a species -- 8.3 Variance dynamics -- 8.3.1 Strategies over a fixed interval -- 8.3.2 Clump of strategies following a mean -- 8.4 Mechanisms of speciation -- 8.4.1 Sympatric speciation at an evolutionarily stable minimum -- 8.4.2 Stable maxima and allopatric speciation -- 8.4.3 Adaptive radiation -- 8.5 Predator-prey coevolution and community evolution -- 8.6 Wright's shifting balance theory and frequency-dependent selection -- 8.7 Microevolution and macroevolution -- 8.8 Incumbent replacement -- 8.9 Procession of life -- 9 Matrix games -- 9.1 A maximum principle for the matrix game -- 9.1.1 Frequency formulation -- 9.1.2 Strategies -- 9.1.3 Payoff function -- 9.1.4 Frequency dynamics -- 9.1.5 Matrix-ESS -- 9.1.6 Maynard Smith's original ESS definition -- 9.2 The 2 × 2 bi-linear game -- 9.2.1 Pure strategies -- 9.2.1.1 Coalition of one -- 9.2.1.2 Coalition of two. , 9.2.2 Mixed strategies -- 9.2.2.1 Coalition of one -- 9.2.3 Evolution of cooperation -- 9.3 Non-linear matrix games -- 9.3.1 Sex ratio game -- 9.3.1.1 The politically correct solution -- 9.3.1.2 Other possible solutions -- 9.3.2 Kin selection -- 10 Evolutionary ecology -- 10.1 Habitat selection -- 10.1.1 Ideal free distribution -- 10.2 Consumer-resource games -- 10.2.1 Competition between plants -- 10.2.2 Carcinogenesis -- 10.2.2.1 Conditions promoting carcinogenesis -- 10.2.2.2 A route to carcinogenesis -- 10.3 Plant ecology -- 10.3.1 Flowering time for annual plants -- 10.3.2 Root competition -- 10.4 Foraging games -- 10.4.1 Gerbil-owl fear game -- 10.4.2 Patch-use model of fierce predators seeking wary prey -- 10.4.2.1 Prey with imperfect information -- 10.4.2.2 Predator's response to prey with imperfect information -- 11 Managing evolving systems -- 11.1 Evolutionary response to harvesting -- 11.1.1 Necessary conditions for an ESS coalition of one -- 11.1.2 Necessary conditions for an ESS coalition of two -- 11.1.3 Specific examples -- 11.2 Resource management and conservation -- 11.2.1 Evolutionarily stable harvest strategies -- 11.2.1.1 Yield -- 11.2.1.2 Ecologically enlightened manager -- 11.2.1.3 Evolutionarily enlightened manager -- 11.2.2 Sustainable yield -- 11.2.3 The Schaeffer model in an evolutionary context -- 11.3 Chemotherapy-driven evolution -- References -- Index.
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  • 3
    Publication Date: 2017-06-15
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
    Publication Date: 2022-05-25
    Description: © 2004 Solzin et al. This article is distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License. The definitive version was published in Journal of General Physiology 124 (2004): 115-124, doi:10.1085/jgp.200409030.
    Description: Chemotaxis of sperm is an important step toward fertilization. During chemotaxis, sperm change their swimming behavior in a gradient of the chemoattractant that is released by the eggs, and finally sperm accumulate near the eggs. A well established model to study chemotaxis is the sea urchin Arbacia punctulata. Resact, the chemoattractant of Arbacia, is a peptide that binds to a receptor guanylyl cyclase. The signaling pathway underlying chemotaxis is still poorly understood. Stimulation of sperm with resact induces a variety of cellular events, including a rise in intracellular pH (pHi) and an influx of Ca2+; the Ca2+ entry is essential for the chemotactic behavior. Previous studies proposed that the influx of Ca2+ is initiated by the rise in pHi. According to this proposal, a cGMP-induced hyperpolarization activates a voltage-dependent Na+/H+ exchanger that expels H+ from the cell. Because some aspects of the proposed signaling pathway are inconsistent with recent results (Kaupp, U.B., J. Solzin, J.E. Brown, A. Helbig, V. Hagen, M. Beyermann, E. Hildebrand, and I. Weyand. 2003. Nat. Cell Biol. 5:109–117), we reexamined the role of protons in chemotaxis of sperm using kinetic measurements of the changes in pHi and intracellular Ca2+ concentration. We show that for physiological concentrations of resact (〈25 pM), the influx of Ca2+ precedes the rise in pHi. Moreover, buffering of pHi completely abolishes the resact-induced pHi signal, but leaves the Ca2+ signal and the chemotactic motor response unaffected. We conclude that an elevation of pHi is required neither to open Ca2+-permeable channels nor to control the chemotactic behavior. Intracellular release of cGMP from a caged compound does not cause an increase in pHi, indicating that the rise in pHi is induced by cellular events unrelated to cGMP itself, but probably triggered by the consumption and subsequent replenishment of GTP. These results show that the resact-induced rise in pHi is not an obligatory step in sperm chemotactic signaling. A rise in pHi is also not required for peptide-induced Ca2+ entry into sperm of the sea urchin Strongylocentrotus purpuratus. Speract, a peptide of S. purpuratus may act as a chemoattractant as well or may serve functions other than chemotaxis.
    Description: This work was supported by a grant from the Deutsche Forschungsgemeinschaft.
    Keywords: Ca2+ ; Chemotaxis ; Cyclic nucleotides ; Fertilization ; Kinetics
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 5
    ISSN: 1442-9993
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A demographic study was conducted in the northern Australian Astrebla grasslands to determine the importance of habitat type in influencing invasion patterns of Acacia nilotica, an exotic leguminous tree from Africa and Asia. One of the repeated patterns observed for A. nilotica is that denser populations are often associated with riparian habitats. Data available on this species do not enable us to determine which of a number of processes has lead to the formation of this pattern. Several explanations were tested for patterns in tree abundance: (i) that more seedlings emerge in wetter habitats; (ii) that mortality is lower in wetter habitats; (iii) that growth rates are faster in wetter habitats; and (iv) that plants are more vigorous (as indicated by leaf cover, flowering intensity and predation rates) over longer periods in wetter habitats. The study was stratified across three habitat types, perennial and ephemeral riparian and non-riparian, which are characteristic of Astrebla grasslands and differentiated by the availability of water. In addition to testing for habitat-linked differentiation in demography, data were also used to test whether seedling emergence, mortality, growth and vigour varied between sites with cattle versus sheep. The data collected indicated that seedling emergence, determined primarily by livestock dispersal, was likely to be the dominant influence on patterns of A. nilotica invasion. Mortality and growth rates were similar in ephemeral riparian and non-riparian habitats, whereas perennial riparian habitats had more rapid growth rates, which may increase the rate of invasion in these areas. Plant vigour was also greater over longer periods in perennial riparian habitats with greater leaf cover, longer flowering season and fewer insect borer holes. Livestock species were found to have little influence on the demography of A. nilotica plants in this study. Very low growth rates and high mortality in A. nilotica populations are likely to lead to net decline in ephemeral riparian and non-riparian habitats in the long term. The importance of episodic recruitment in the maintenance of A. nilotica populations is discussed.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1442-9993
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Paddock-scale Acacia nilotica L. Willd. ex Del. (prickly acacia) spatial distribution, seed production and dispersal patterns were investigated in the Astrebla (Mitchell) grasslands of northern Australia as a step toward predicting future patterns of invasion. A number of hypotheses were tested based on what we know of this species in both Australia and regions where it is native, for example South Africa. It was hypothesized that most A. nilotica seeds would be produced by trees in riparian habitats with access to permanent water. In addition, we predicted that seeds would be dispersed throughout the Astrebla grassland landscape by cattle, following observations that cattle readily ingest and pass seeds and that cattle have access to all areas within paddock boundary fences. Tree density, seed production and seed dispersal by cattle were measured along a series of transects from permanent watering points to paddock boundary fences. Trees associated with permanent watering points produced more seeds per unit area and occurred at higher density than their non-riparian counterparts. The importance of riparian trees decreased in years with high rainfall and in paddocks with only small areas of riparian habitat. Cattle spread dung and seeds throughout paddocks, with peaks of deposition adjacent to permanent watering points. These results suggest that invasion patterns are likely to be uneven across the landscape and may be reactive to climate. High seedling recruitment and possible thicket formation is expected adjacent to permanent watering points and wherever cattle congregate. Patterns of recruitment in non-riparian areas are likely to be relatively sparse. The importance of post-dispersal factors in determining recruitment patterns is discussed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 9 (1983), S. 223-225 
    ISSN: 1432-2161
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1939
    Keywords: Predation ; Desert rodents ; Habitat selection ; Optimal foraging ; Predatory risk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Researchers have documented microhabitat partitioning among the heteromyid rodents of the deserts of North America that may result from microhabitat specific predation rates; large/bipedal species predominate in the open/risky microhabitat and small/quadrupedal species predominate in the bush/safer microhabitat. Here, we provide direct experimental evidence on the role of predatory risk in affecting the foraging behavior of three species of heteromyid rodents: Arizona pocket mouse (Perognathus amplus; small/quadrupedal), Bailey's pocket mouse (P. baileyi; large/quadrupedal), and Merriam's kangaroo rat (Dipodomys merriami; large/bipedal). Both kangaroo rats and pocket mice are behaviorally flexible and able to adjust their foraging behavior to nightly changes in predatory risk. Under low levels of perceived predatory risk the kangaroo rat foraged relatively more in the open microhabitat than the two pocket mouse species. In response to the presence of barn owls, however, all three species shifted their habitat use towards the bush microhabitat. In response to direct measures of predatory risk, i.e. the actual presence of owls, all three species reduced foraging and left resource patches at higher giving up densities of seeds. In response to indirect indicators of predatory risk, i.e. illumination, there was a tendency for all three species to reduce foraging. The differences in morphology between pocket mice and kangaroo rats do appear to influence their behavioral responses to predatory risk.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 83 (1990), S. 512-518 
    ISSN: 1432-1939
    Keywords: Habitat selection ; Foraging behavior ; Predation costs ; Desert porcupines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We established depletable, artificial food patches in three habitats used by Indian crested porcupines (Hystrix indica) in a desert biome, and measured the number of food items remaining (i.e., “giving up density”=GUD) following nightly foraging bouts. Porcupines discriminated between resource types (peanuts vs. garbanzo beans), and exhibited clear habitat preferences in the face of uniform resource availability in time and space. Lowest GUD's (=lowest foraging costs) were in the habitat of densest cover, and during dark (little or no moon) nights. The results indicated a high sensitivity to predation risk. Crested porcupines behaved as expected of optimal foragers, and appear to be excellent subjects for further field experiments using the GUD approach.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 1217-1219 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WHEN photons fall on an eye, their energy is absorbed by the visual pigments of the photoreceptor cells (rods and cones in vertebrates; retinular cells in invertebrates). This process is followed by a change in the membrane potential of the photoreceptor cell, the so-called generator potential. ...
    Type of Medium: Electronic Resource
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