Pittsburgh, Pennsylvania, ca. 1879 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Map of Pittsburgh : showing the location of its furnaces, rolling mills & steel works. It was published by Chilton Co., etc., ca. 1879. Scale [ca.1:33,800]. Covers a portion of Pittsburgh, Pennsylvania. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Pennsylvania South State Plane NAD 1983 coordinate system (in Feet) (Fipszone 3702). 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 roads, railroads and stations, drainage, selected buildings, and more. Includes inset map covering Pittsburgh area as far as McKeesport. Below map: List of Blast Furnaces -- List of Rolling Mills -- List of Steel Works. This layer is part of a selection of digitally scanned and georeferenced historic maps from The Harvard Map Collection as part of the Imaging the Urban Environment project. Maps selected for this project represent major urban areas and cities of the world, at various time periods. These maps typically portray both natural and manmade features at a large scale. The selection represents a range of regions, originators, ground condition dates, scales, and purposes.

New Orleans, Louisiana and vicinity, 1931 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Map of greater New Orleans, Louisiana. It was published by the New Orleans Association of Commerce in 1931. Scale [ca. 1:32,000]. Covers also adjacent portions of Jefferson and St. Bernard Parishes. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Louisiana State Plane Coordinate System, South NAD83 (in Feet) (Fipszone 1702). 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, or other information associated with the principal map. This map shows features such as roads, railroads, canals, levees, drainage, land ownership in outlying areas, cemeteries, parks, Parish boundaries, ferry routes, and more. Includes index in margins. This layer is part of a selection of digitally scanned and georeferenced historic maps from The Harvard Map Collection as part of the Imaging the Urban Environment project. Maps selected for this project represent major urban areas and cities of the world, at various time periods. These maps typically portray both natural and manmade features at a large scale. The selection represents a range of regions, originators, ground condition dates, scales, and purposes.

Yokohama-shi & Kanagawa-ken Region, 1879 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: The environs of Yokohama, compiled and drawn by A. Farsari ; engrd. by Engr. Cy. Tokio. It was published by Sargent, Farsari & Co. in 1879. Scale [ca. 1:280,486]. Covers the Yokohama-shi & Kanagawa-ken region, Japan. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Tokyo Universal Transverse Mercator (UTM) Zone 54N projected 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 cities and towns, roads, railroads, drainage, built-up areas, district and province boundaries, and more. Relief shown pictorially.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.

Liberia, 1879 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Map of the republic of Liberia : constructed from authentic charts & original surveys by Benj. Anderson, Monrovia 1879. It was published in 1879. Covers Liberia and portions of Sierra Leone, Guinea, and Côte d'Ivoire. Scale 1:1,013,760.The image inside the map neatline is georeferenced to the surface of the earth and fit to the World Miller Cylindrical projected 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, cities and other human settlements, territorial boundaries, shoreline features, land acquisitions with dates, exploration routes, and more.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.

Influencia de las variaciones estacionales del nivel de agua sobre la reproducción y el crecimiento de Potamorhina altamazonica (COPE, 1879) en el Río Ucayali, Perú

Se estudió la influencia de las variaciones estacionales del nivel de agua sobre la reproducción y el crecimiento de Potamorhina altamazonica en el río Ucayali durante los años 2008-2012. Se observó que, la reproducción es de carácter estacional, que, tiene sincronía con el periodo de creciente (enero-marzo) alcanzado el ápice en febrero. Se estimó que las hembras alcanzan la talla media de primera madurez a los 17,8 cm y los machos a los 18,4 cm (Lt), en ambos casos a la edad teórica de un año. La mayor proporción de hembras respecto a los machos se observó en el periodo de transición a creciente, y viceversa en la creciente; mientras que el análisis anual mostró dominancia de hembras en los años 2008 y 2012. El análisis de la estructura de tallas mostró que el stock explotado estuvo compuesto por peces cuyas tallas oscilaron de 12,0 a 31,0 cm Lt y no se observaron fuertes fluctuaciones de la talla media anual. La ecuación de crecimiento de von Bertalanffy definida por Lt = 33,55*(1-e(-0,65(t-0,26)) permite estimar que la especie es de rápido crecimiento y que podría vivir en teoría 3,5 años. Los peces mostraron mejor condición o robustez en los periodos de transición a creciente y creciente, dado a que en estos, se inundan vastas áreas de bosques de llanura convirtiéndose en hábitats óptimos que favorecen la reproducción en los peces adultos y el crecimiento en los reclutas.

El mensaje de América ...

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