Bio121-Lecture2

Bio121-Lecture2 - Social Factors and the Environment Zoo...

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Social Factors and the Environment Zoo 121 Chapter 2 08/25/11
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Random Fact of the day ± The barrel eye fish has a transparent head ± It lives in the deep ocean ± The eyes are the green hemispheres in it’s head, ± They point straight up to detect prey silhouetted against the surface light
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Some Responses to Teusday’s question ± “I’m honestly not a very opinionated person when it comes to the environment” ± “Some aspects of the environment can be annoying, but every part of nature plays an important role” ± “my parents always comment about how they were always outside when they were younger” ± “It is so easy to not think about the environment on a daily basis” ± “Dogs are good house pets, however wild animals like alligators, lions, gazelles, deer etc… should live in their natural environment”
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Easter Island A cautionary Tale
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Easter Island was a tropical Paradise ± Heavily forested ± Largest palm tree species that ever existed ± More bird species (25) than any other island of similar size ± Seals, tuna, and other deep water fish were abundant nearby ± Several rivers and fresh water lakes ± Fertile volcanic soil
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Deforestation http://www.questconnect.org/images/palm_ch.jpg ± House construction ± Boat construction ± Fire wood ± Food (nuts and hearts) ± Cremation ± Rope and track to move statues ± Cleared for agriculture
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The Islanders carved large statues, called Maoi
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The maoi were very expensive ± May have taken months or years to carve ± Required many logs and ropes to move. ± A large percentage of the island did little
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The trees were eventually all cut down Soil eroded into the sea. This caused streams and springs to dry up. Crop yields decreased drastically until there was no more arable land Wildlife disappeared No more canoes, so no fishing. No fuel for cooking A typical hillside on Easter Island.
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DESPARATE MEASURES FOR SURVIVAL ON EASTER ISLAND Tribal warfare broke out Rival religious groups fought for control cannibalism became common Population dropped from 15,000 to only 2,000 in 1722 Cannibalism by Salvatore Dali
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What do you think the person who cut down the last tree on the island was thinking?
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Earth Island
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The most distant picture ever taken of earth Earth appears as a pale blue dot in one of the final photos taken by the voyager spacecraft as it left the solar system That’s saturn, not earth Earth
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But we’re not erecting huge environmentally destructive statues in our backyards. ± Right?
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Bio121-Lecture2 - Social Factors and the Environment Zoo...

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