67 research outputs found

    A graphical theory of competition on spatial resource gradients

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    Resource competition is a fundamental interaction in natural communities.However little is known about competition in spatial environments where organisms are able to regulate resource distributions. Here, we analyze the competition of two consumers for two resources in a one-dimensional habitat in which the resources are supplied from opposite sides. We show that the success of an invading species crucially depends on the slope of the resource gradients shaped by the resident. Our analysis reveals that parameter combinations which lead to coexistence in a uniform environment may favor alternative stable states in a spatial system, and vice versa. Furthermore, differences in growth rate, mortality or dispersal abilities allow a consumer to coexist stationarily with - or even outcompete - a competitor with lower resource requirements. Applying our theory to a phytoplankton model, we explain shifts in the community structure that are induced by environmental changes

    Individual Human Brain Areas Can Be Identified from Their Characteristic Spectral Activation Fingerprints

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    The human brain can be parcellated into diverse anatomical areas. We investigated whether rhythmic brain activity in these areas is characteristic and can be used for automatic classification. To this end, resting-state MEG data of 22 healthy adults was analysed. Power spectra of 1-s long data segments for atlas-defined brain areas were clustered into spectral profiles (“fingerprints”), using k-means and Gaussian mixture (GM) modelling. We demonstrate that individual areas can be identified from these spectral profiles with high accuracy. Our results suggest that each brain area engages in different spectral modes that are characteristic for individual areas. Clustering of brain areas according to similarity of spectral profiles reveals well-known brain networks. Furthermore, we demonstrate task-specific modulations of auditory spectral profiles during auditory processing. These findings have important implications for the classification of regional spectral activity and allow for novel approaches in neuroimaging and neurostimulation in health and disease

    La Prusse contemporaine et les institutions

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    Mode of access: Internet

    Zeiten, Völker und Menschen / von Karl Hillebrand

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    ZEITEN, VÖLKER UND MENSCHEN / VON KARL HILLEBRAND Zeiten, Völker und Menschen / von Karl Hillebrand Frankreich und die Franzosen in der zweiten Hälfte des XIX. Jahrhunderts : Eindrücke und Erfahrungen / von Karl Hillebrand (Bd. 1) Wälsches und Deutsches (Bd. 2

    La Prusia contemporánea y sus instituciones

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    French Intellectual Life, Chapters I-III

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    Frankreich und die Franzosen in der zweiten Hälfte des XIX. Jahrhunderts : Eindrücke und Erfahrungen / von Karl Hillebrand

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    FRANKREICH UND DIE FRANZOSEN IN DER ZWEITEN HÄLFTE DES XIX. JAHRHUNDERTS : EINDRÜCKE UND ERFAHRUNGEN / VON KARL HILLEBRAND Zeiten, Völker und Menschen / von Karl Hillebrand (-) Frankreich und die Franzosen in der zweiten Hälfte des XIX. Jahrhunderts : Eindrücke und Erfahrungen / von Karl Hillebrand (Bd. 1) (1) Einband (1) Titelseite (7) Titelseite (8) Widmung (9) Inhalt. (10) Vorwort zur zweiten Auflage. (11) Einleitendes. (15) Die Gesellschaft und Litteratur. (21) I. Familie und Sitte. (22) II. Unterrichtswesen. (44) III. Die Provinz und Paris. (62) IV. Geistiges Leben. (83) Politisches Leben. (99) I. Das Ideal und seine Verwirklichung. (101) II. Napoleon III. und die Republikaner. (121) III. Thiers und die Constitutionellen. (141) IV. Schlussbetrachtung. (158) Anhang. (172

    Wälsches und Deutsches

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    WÄLSCHES UND DEUTSCHES Zeiten, Völker und Menschen / von Karl Hillebrand (-) Wälsches und Deutsches (Bd. 2) (1) Titelseite (1) Widmung (2) Inhalt. (3) Vorwort. (4) I. Zur Renaissance. (6) II. Zeitgenössisches aus Italien. (34) III. Französisches. (69) IV. Aus dem zünftigen Schriftthum Deutschlands. (107) V. Aus dem unzünftigen Schriftthum Deutschlands. (181

    Italia.

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    A collection of essays by various authors on the history, literature, politics, industry, art, etc., of Italy.Mode of access: Internet
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