Walking Sideways

Author: Judith S. Weis
Publisher: Cornell University Press
ISBN: 0801465605
Format: PDF
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The world's nearly 7,000 species of crabs are immediately recognizable by their claws, sideways movement, stalked eyes, and thick outer shells. These common crustaceans are found internationally, thriving in various habitats from the edge of the sea to the depths of the ocean, in fresh water or on land. Despite having the same basic body type as decapod crustaceans-true crabs have heavy exoskeletons and ten limbs with front pincer claws-crabs come in an enormous variety of shapes and sizes, from the near microscopic to the giant Japanese spider crab. In Walking Sideways, Judith S. Weis provides an engaging and informative tour of the remarkable world of crabs, highlighting their unique biology and natural history. She introduces us to recently discovered crabs such as the Yeti crab found in deep sea vents, explains what scientists are learning about blue and hermit crabs commonly found at the shore, and gives us insight into the lifecycles of the king and Dungeness crabs typically seen only on dinner plates. Among the topics Weis covers are the evolution and classification of crabs, their habitats, unique adaptations to water and land, reproduction and development, behavior, ecology, and threats, including up-to-date research. Crabs are of special interest to biologists for their communication behaviors, sexual dimorphism, and use of chemical stimuli and touch receptors, and Weis explains the importance of new scientific discoveries. In addition to the traditional ten-legged crabs, the book also treats those that appear eight-legged, including hermit crabs, king crabs, and sand crabs. Sidebars address topics of special interest, such as the relationship of lobsters to crabs and medical uses of compounds derived from horseshoe crabs (which aren't really crabs). While Weis emphasizes conservation and the threats that crabs face, she also addresses the use of crabs as food (detailing how crabs are caught and cooked) and their commercial value from fisheries and aquaculture. She highlights other interactions between crabs and people, including keeping hermit crabs as pets or studying marine species in the laboratory and field. Reminding us of characters such as The Little Mermaid's Sebastian and Sherman Lagoon's Hawthorne, she also surveys the role of crabs in literature (for both children and adults), film, and television, as well in mythology and astrology. With illustrations that offer delightful visual evidence of crab diversity and their unique behaviors, Walking Sideways will appeal to anyone who has encountered these fascinating animals on the beach, at an aquarium, or in the kitchen.

Controversies in Science Technology

Author: Daniel Lee Kleinman
Publisher: Oxford University Press (UK)
ISBN: 0199383774
Format: PDF, ePub, Docs
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When it comes to any current scientific debate, there are more than two sides to every story. Controversies in Science and Technology, Volume 4 analyzes controversial topics in science and technology-infrastructure, ecosystem management, food security, and plastics and health-from multiple points of view. The editors have compiled thought-provoking essays from a variety of experts from academia and beyond, creating a volume that addresses many of the issues surrounding these scientific debates. Part I of the volume discusses infrastructure, and the real meaning behind the term in today's society. Essays address the central issues that motivate current discussion about infrastructure, including writing on the vulnerability to disasters. Part II, titled "Food Policy," will focus on the challenges of feeding an ever-growing world and the costs of not doing so. Part III features essays on chemicals and environmental health, and works to define "safety" as it relates to today's scientific community. The book's final section examines ecosystem management. In the end, Kleinman, Cloud-Hansen, and Handelsman provide a multifaceted volume that will be appropriate for anyone hoping to understand arguments surrounding several of today's most important scientific controversies.

Der Mensch und das Meer

Author: Callum Roberts
Publisher: DVA
ISBN: 3641100062
Format: PDF, ePub, Docs
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Der Wandel eines faszinierenden, bedrohten Lebensraums Die Ozeane sind nicht nur der größte Lebensraum der Erde, sondern auch der am wenigsten erforschte. Die unermessliche Vielfalt dieses Ökosystems beginnen wir erst jetzt bis in die letzten Winkel zu begreifen – auch wie wichtig das Meer für unser Leben ist. Im letzten Jahrhundert hat jedoch die Herrschaft des Menschen über die Natur auch die Ozeane erreicht: Wir fischen die Meere leer und füllen sie stattdessen mit Umweltgiften. Tiefseebergbau droht den Lebensraum unzähliger Pflanzen und Tiere bis zur Unkenntlichkeit zu verändern. Die Klimaerwärmung ließ bereits ein Viertel aller Korallen zugrunde gehen. In seinem aufrüttelnden Buch beschreibt der Meeresbiologe und –schützer Callum Roberts den großen Reichtum der Ozeane und ihren Wandel, und er ruft dazu auf, der Zerstörung der Meere endlich Einhalt zu gebieten, denn noch ist es nicht zu spät.