Chapter 1. The Science of Marine Biology - Why is it important? Marine Biology. The scientific study of the organisms that live in the sea
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1 Chapter 1 The Science of Marine Biology - Why is it important? Marine Biology Marine Biology - The scientific study of the organisms that live in the sea 1
2 Practical Reasons to study marine biology Vast source of human wealth food, medicines and raw materials Recreation to millions Supports tourism Some marine organism cause problems by causing disease or attacking people Harm us indirectly by injuring or killing other marine organisms that we value for food or other purposes Erode piers, walls and other structures, foul ship bottoms and clog pipes Fundamental Reasons to study Marine Biology Marine life determines the very nature of our planet Produce much of the oxygen they breathe Regulate earth s climate Shorelines are protected and shaped by marine life Some marine organisms create new land 2
3 Ocean s living systems are worth more than $20 trillion a year We must learn all we can about marine life To make both full and wise use of the sea s living resources To solve the problems marine organisms create Predict the effects of human activities on the life of the sea Marine organisms provide clues to earth s past and the history of life and our own bodies 3
4 The Science of Marine Biology - What is Marine Biology? What is Marine Biology? Marine Biology - The science of biology applied to the sea Includes basic chemistry The study of whole organisms, the way they behave or where they live and why 4
5 What is Marine Biology? Marine biology is closely related to oceanography - the scientific study of the oceans Geological oceanographers study the sea floor Chemical oceanographers study ocean chemistry Physical oceanographers study waves, tides, currents, and other physical aspects of the sea Biological oceanography closely related to marine biology can be considered the same thing The History of Marine Biology 5
6 The History of Marine Biology People started learning about marine life forms as soon as they saw the ocean Coastal people in virtually ever culture developed a store of practical knowledge about marine life and the oceans Knowledge of the ocean and its organisms developed as people gained skills in seamanship and navigation Greek philosopher Aristotle (4 th century BC) is considered by many to the first marine biologist He described many forms of marine life and many of his descriptions are still valid Ancient Greece 6
7 The Dark Ages Little learning and discovery occurred 995 AD Leif Eriksson discovered Vinland (N. Am.) Arab traders were active on the ocean at this time learned about wind and current patterns and monsoons The Renaissance Europeans began to investigate the world around them 1492 Columbus discovers New World 1519 Magellan sailed around the globe Fairly accurate maps were created during this time 7
8 18th Century Captain James Cook English sea captain Was one of the first to make scientific observations along the way and to include a full-time naturalist among his crew First to use a chronometer accurate time piece Brought back specimens of plants and animals 19 th Century Common for vessels to take a naturalist along to collect and study the life forms that were encountered HMS Beagle Charles Darwin goes on a 5 year voyage develops the theory of evolution by natural selection Darwin explain how atolls form and used nets to collect plankton and studied barnacles in detail 8
9 Edward Forbes 19th Century s carried extensive dredging of the sea floor most influential marine biologist of his day Discovered many previously unknown organisms Recognized that sea life is different at different depths Inspired new interest in the life of the sea floor 19th Century - HMS Challenger HMS Challenger voyages from are taken just to study the oceans The natural history lab The sampling deck 9
10 19th Century - HMS Challenger Charles Wyville Thompson Lead the first major oceanographic expedition HMS Challenger British navy supplied the ship The ship was outfitted for the expedition with the best scientific equipment of the day 19th Century - HMS Challenger December 1872 the Challenger set off on its 3 ½ year voyage The crew sailed around the world and gathered information and collected samples Volume of data collected was enormous 10
11 19th Century - HMS Challenger It took 19 years to publish all the data collected The data filled up 50 thick volumes The challenger brought back more information about the ocean than had ever been recorded in all previous human history 19th Century - HMS Challenger The expedition set new standards for studying the ocean Measurements were made systematically and carefully and meticulous records were kept Laid the foundations of modern marine science 11
12 Marine Biology - The Development of Technology Marine Labs Biologists began to work at the seashore Allowed for long term observations and experiments that were not possible on a ship 12
13 Marine Labs Henri Milne Edwards and Victor Andouin (1826) began to make visits to the shore and study the life there Permanent laboratories dedicated to the study of marine life were established First lab Stazione Zoologica 1872 Naples, Italy Marine Biological Society of the United Kingdom 1879 Plymouth, England First major American Lab Marine Biological Laboratory at Woods Hole, Mass World War II Marine Labs Had a major effect on the development of marine biology Sonar (sound navigation radar) developed in response to the growing importance of submarine warfare Sonar based on the detection of underwater echoes Understanding the sounds produced by marine mammals now became a matter of national security 13
14 Years after World War II Refinement of SCUBA (self contained underwater breathing apparatus) Basic technology used in SCUBA was developed by French engineer Emile Gagnan Jacques Cousteau modified the apparatus, using it to breathe compressed air under water Cousteau devoted his life to scuba diving and the oceans Films, books and television programs inspired a fascination with the ocean Also alerted people to the threats to the health of the marine environment Marine Biology Today High tech subs can descend to the deepest parts of the ocean Variety of odd looking vessels provide specialized facilities for marine scientists Underwater robots take photos, make measurements and collect samples in the ocean depths 14
15 Marine Biology Today ROV s (remotely operated vehicles) are controlled from the surface AUV s (autonomous underwater vehicles) are preprogrammed to do their jobs independently of direct human control Marine Biology Today Computers allow scientists to rapidly analyze huge amounts of information Satellites orbit the earth peering down into the ocean can capture the big picture 15
16 Marine Biology Today Satellite Technology Measures temperature of the sea surface tracks ocean currents determines the abundance and kinds of organisms present monitors human impacts of the ocean Marine Biology Today Remote Sensing Technology Used to study the earth and its oceans from afar Track the migrations of whales Electronic buoys travel in oil spills to monitor the path the oil takes 16
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