Low but contrasting neutral genetic differentiation shaped by winter temperature in European great tits

Gene flow is usually thought to reduce genetic divergence and impede local adaptation by homogenising gene pools between populations. However, evidence for local adaptation and phenotypic differentiation in highly mobile species, experiencing high levels of gene flow, is emerging. Assessing population genetic structure at different spatial scales is thus a crucial step towards understanding mechanisms underlying intraspecific differentiation and diversification. Here, we studied the population genetic structure of a highly mobile species – the great tit Parus major – at different spatial scales. We analysed 884 individuals from 30 sites across Europe including 10 close-by sites (< 50 km), using 22 microsatellite markers. Overall we found a low but significant genetic differentiation among sites (FST = 0.008). Genetic differentiation was higher, and genetic diversity lower, in south-western Europe. These regional differences were statistically best explained by winter temperature. Overall, our results suggest that great tits form a single patchy metapopulation across Europe, in which genetic differentiation is independent of geographical distance and gene flow may be regulated by environmental factors via movements related to winter severity. This might have important implications for the evolutionary trajectories of sub-populations, especially in the context of climate change, and calls for future investigations of local differences in costs and benefits of philopatry at large scales.

Topological invariance and spatial scaling of surface roughness in two highly eroded zones of Mexico: a comparative study

The Fractal Image Informatics toolbox (Oleschko et al., 2008 a; Torres-Argüelles et al., 2010) was applied to extract, classify and model the topological structure and dynamics of surface roughness in two highly eroded catchments of Mexico. Both areas are affected by gully erosion (Sidorchuk, 2005) and characterized by avalanche-like matter transport. Five contrasting morphological patterns were distinguished across the slope of the bare eroded surface of Faeozem (Queretaro State) while only one (apparently independent on the slope) roughness pattern was documented for Andosol (Michoacan State). We called these patterns ?the roughness clusters? and compared them in terms of metrizability, continuity, compactness, topological connectedness (global and local) and invariance, separability, and degree of ramification (Weyl, 1937). All mentioned topological measurands were correlated with the variance, skewness and kurtosis of the gray-level distribution of digital images. The morphology0 spatial dynamics of roughness clusters was measured and mapped with high precision in terms of fractal descriptors. The Hurst exponent was especially suitable to distinguish between the structure of ?turtle shell? and ?ramification? patterns (sediment producing zone A of the slope); as well as ?honeycomb? (sediment transport zone B) and ?dinosaur steps? and ?corals? (sediment deposition zone C) roughness clusters. Some other structural attributes of studied patterns were also statistically different and correlated with the variance, skewness and kurtosis of gray distribution of multiscale digital images. The scale invariance of classified roughness patterns was documented inside the range of five image resolutions. We conjectured that the geometrization of erosion patterns in terms of roughness clustering might benefit the most semi-quantitative models developed for erosion and sediment yield assessments (de Vente and Poesen, 2005).

Multifractal analysis of the pore- and solid-phases in binary two-dimensional images of natural porous structures

We use multifractal analysis (MFA) to investigate how the Rényi dimensions of the solid mass and the pore space in porous structures are related to each other. To our knowledge, there is no investigation about the relationship of Rényi or generalized dimensions of two phases of the same structure.

A Program for Fractal and Multifractal Analysis of Two-Dimensional Binary Images. Computer Algorithms versus Mathematical Theory.

In this paper we present a tool to carry out the multifractal analysis of binary, two-dimensional images through the calculation of the Rényi D(q) dimensions and associated statistical regressions. The estimation of a (mono)fractal dimension corresponds to the special case where the moment order is q = 0.

Intracellular pH in Arbuscular Mycorrhizal Fungi1 : A Symbiotic Physiological Marker

A method was developed to perform real-time analysis of cytosolic pH of arbuscular mycorrhizal fungi in culture using dye and ratiometric measurements (490/450 nm excitations). The study was mainly performed using photometric analysis, although some data were confirmed using image analysis. The use of nigericin allowed an in vivo calibration. Experimental parameters such as loading time and concentration of the dye were determined so that pH measurements could be made for a steady-state period on viable cells. A characteristic pH profile was observed along hyphae. For Gigaspora margarita, the pH of the tip (0–2 μm) was typically 6.7, increased sharply to 7.0 behind this region (9.5 μm), and decreased over the next 250 μm to a constant value of 6.6. A similar pattern was obtained for Glomus intraradices. The pH profile of G. margarita germ tubes was higher when cultured in the presence of carrot (Daucus carota) hairy roots (nonmycorrhizal). Similarly, extraradical hyphae of G. intraradices had a higher apical pH than the germ tubes. The use of a paper layer to prevent the mycorrhizal roots from being in direct contact with the medium selected hyphae with an even higher cytosolic pH. Results suggest that this method could be useful as a bioassay for studying signal perception and/or H+ cotransport of nutrients by arbuscular mycorrhizal hyphae.

Black Sea and Caucasus Regions, 1774 (Image 1 of 3) (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Carte de la partie septentrionale de l'Empire Otoman : dédiée a Monseigneur le comte de Vergennes--, par ... Rizzi Zannoni, de l'Académie Royale des Sciences et Belles Lettres de Gottingue, Pr. Ingénieur, Géographe du Roy ; Perrier sculpsit ; Bourgoin scripsit. It was published in 1774. Scale [ca. 1:1,450,000]. Covers the Black Sea and Caucasus regions. This layer is image 1 of 3 total images of the three sheet source map, representing the western portion of the map. Map in French. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Europe Lambert Conformal Conic coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, roads, cities and other human settlements, territorial boundaries, shoreline features, and more. Relief shown by hachures.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

Black Sea and Caucasus Regions, 1774 (Image 2 of 3) (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Carte de la partie septentrionale de l'Empire Otoman : dédiée a Monseigneur le comte de Vergennes--, par ... Rizzi Zannoni, de l'Académie Royale des Sciences et Belles Lettres de Gottingue, Pr. Ingénieur, Géographe du Roy ; Perrier sculpsit ; Bourgoin scripsit. It was published in 1774. Scale [ca. 1:1,450,000]. Covers the Black Sea and Caucasus regions. This layer is image 2 of 3 total images of the three sheet source map, representing the central portion of the map. Map in French. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Europe Lambert Conformal Conic coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, roads, cities and other human settlements, territorial boundaries, shoreline features, and more. Relief shown by hachures.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

Black Sea and Caucasus Regions, 1774 (Image 3 of 3) (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Carte de la partie septentrionale de l'Empire Otoman : dédiée a Monseigneur le comte de Vergennes--, par ... Rizzi Zannoni, de l'Académie Royale des Sciences et Belles Lettres de Gottingue, Pr. Ingénieur, Géographe du Roy ; Perrier sculpsit ; Bourgoin scripsit. It was published in 1774. Scale [ca. 1:1,450,000]. Covers the Black Sea and Caucasus regions. This layer is image 3 of 3 total images of the three sheet source map, representing the eastern portion of the map. Map in French. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Europe Lambert Conformal Conic coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, roads, cities and other human settlements, territorial boundaries, shoreline features, and more. Relief shown by hachures.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

Traité de paysage mis à la portée de tous /

Mode of access: Internet.

La natation naturelle à l'homme et l'art de nager, suivi de considérations sur les traitements hydrothérapiques et sur l'effet hygiénique des bains froids et des bains chauds /

Mode of access: Internet.

Hydrologic simulation on solid waste disposal sites (HSSWDS) /

"SW-868"--Cover.

Jonction géodésique et astronomique de l'Algérie avec l'Espagne,

Issued also, with additions, as v. 13 of "Memorial du Dépot général de la guerre [de France]"

Histoire des embaumements et de la préparation des pièces d'anatomie normale : d'anatomie pathologique et d'histoire naturelle suivie de procédés nouveaux /

Mode of access: Internet.

Caii Sollii Apollinaris Sidonii ... Opera /

Mode of access: Internet.