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Oceanography and Marine Sciences (4) Bioacoustics: Cetaceans and Seeing Sounds  From: Woods Hole Oceanographic Institution How does one see a sound? Scientists like Patrick Miller use a spectrogram, or visual representation of sound waves graphed over time. Miller has created an engaging interactive series of actual recordings and spectrograms of various marine mammals. Knowing how dolphins and whales communicate using sounds will help us understand the effects of human-made noise on marine animals and find ways to create more environmentally friendly devices, such as fishing nets that dolphins and whales can detect and therefore avoid. Deep Ocean From: The Natural History Museum Earth is dominated by its oceans. They cover two-thirds of its surface, and may harbour more species than all the Earth's other environments put together. Yet, for most of us, the deep oceans and the strange animals that inhabit them are as alien and remote as the surface of the moon. Jaws: The Natural History of Sharks From: The Natural History Museum Primitive fishes resembling sharks were swimming in the oceans over 450 million years ago. Their descendants survived successive mass extinctions, including the catastrophe at the end of the Permian period (245 million years ago) when 96 percent of all marine life was extinguished. They saw the dinosaurs come and go, and were still thriving when the mammals returned to the sea. Their long evolutionary history has refined sharks to the rank of near-perfect predators. Marine Protected Areas: Finding a Balance Between Conservation and Fisheries Management From: Woods Hole Oceanographic Institution Compared to land-based national parks, only a tiny fraction of marine areas have been set aside for protection and designated as marine protected areas (MPAs)--and many of these have varying levels of restrictions on use. This seminar explains what MPAs are and discusses many of the most important issues surrounding them in terms of their creation, design, monitoring and effects. Of interest to not only people involved in conservation or fisheries groups, this seminar also provides necessary background information for concerned citizens who participate in marine activities or who want to know more about marine conservation and fisheries management issues. | |||||||||||||||
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