La mirada de Medusa

Presented as a catalogue, the authors provide complete and true information about endangered Mexican Freshwater fishes. A physical and ethological description, the reason of its involvement in the book, preservation state, natural history and ecology, as well as a map with its geographical location in Mexico, and a picture of the specie is provided for each fish. This book is a start point for the knowledge and preservation of the richness of this biological group.

La presente investigación surgió como una necesidad de llenar un vacío existente en el campo de la geografía de nuestro país, ya que no se podía localizar un texto que sintetizara los aspectos más relevantes que se habían publicado en relación con la historia geológica de Costa Rica, así como las migraciones de especies de flora y fauna, las que habían utilizado como vía de tránsito el territorio ístmico de América Central, facilitando la dispersión de esas especies tanto por Norte como por Sur América.

Explore the everyday miracle of the microscopic world With spectacular macro photography and microscope images, this book reveals a hidden, living world full of intricate structures beyond the naked eye. Included are the tiniest insects and spiders; but looking deeper, you will discover truly microscopic creatures--even bacteria and viruses. Earth is home to more microbes, and more different types of microbes, than any other living organism. Bacteria on Earth outweigh humans by 1,100 to 1; and without them, all world ecosystems would collapse. This book reveals this vital, unseen realm, but...