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Recreating Darwin’s Voyage

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1 Recreating Darwin’s Voyage
Evolution Unit Intro to Evolution / Natural Selection: Recreating Darwin’s Voyage Answer Key

2 Island 1 What is evolution? What was Darwin’s contribution to science?
“the process by which organisms have changed over time.” Miller & Levine, Biology (p.450) What was Darwin’s contribution to science? “Darwin developed a scientific theory of biological evolution that explains how modern organisms evolved over long periods of time through descent from common ancestors.” Miller & Levine, Biology (p.450) When did Darwin’s voyage on the Beagle begin? How long did it last for? 5 years What was the purpose of his voyage? Map the coastline of South America

3 Island 2 Look at the map of Darwin’s voyage on page Also have the world biome map open from page How many different biomes did Darwin visit on his voyage? Temperate Forest Temperate Woodland / Shrubland Tropical Grassland / Savanna / Shrubland Desert Tropical Rainforest Temperate Grassland How did the geography of Darwin’s voyage give him far greater exposure to species variability than his fellow scientists back home had? While surveying the various coastlines and visiting many continents, Darwin traveled to many different biomes. The more he traveled to more ecological environments, the more he was exposed to varying species.

4 Island 3 & 4 The 3 netbooks have 3 different birds from 3 different places in the world. List the names of the birds and the places in the world they come from: How are these birds similar? How are they different? Bird: Where it is from: a. Ostrich Africa b. Rheas South America c. Emu Austrila Similar: Different Large Different Feathers Flightless Rheas & Emus have 3 toes, Ostriches have 2 toes Live in Grasslands Live exclusively to their respective continent

5 Island 3 & 4 This leads us to Darwin’s first set of observations. Using the birds as examples, what can you conclude about different species of birds living in different places in the world? Darwin saw that different, yet economically similar, animals lived in similar environments around the world! For example, he noticed that Rheas, Ostriches, and Emus were all different, but shared similarities as large flightless birds that adapted to grasslands. “Darwin noticed that different, yet ecologically similar, animal species inhabited separated, but ecologically similar, habitats around the world.” Miller & Levine, Biology (p.451)

6 Off the coast of Equator in South America
Island 5 Where are the Galapagos Islands located? Off the coast of Equator in South America What are some interesting species of animals found there? Giant Tortoises Mockingbirds Finches Marine Iguanas

7 Island 6 & 7 Look at the 2 different netbook pictures of the 2 different tortoises. These each come from different islands. What can you infer about the different tortoises and the shape of their shell? Tortoise shells have predictably adapted to their specific island environment. Isabella Island Tortoise Hood Island Tortoise Dome Shaped Shell Curved Shells with a Large Neck Opening Short Necks Long Necks Food is abundant and low Food is sparse and high

8 Island 8 Look at the picture of the different finches on the Galapagos Islands. What can you infer about their different beaks? Platyspiza Certhidea Pinaroloxias Geospiza Tree Finch Ground Finch Strips bark from trees Eats small exposed insects Eats insects, fruit, and nectar Eats large, thick seeds Needs a beak to grip and hold firm Needs thin, straight, narrow beak, with firm grip tip Needs a curved, beak that can probe and grip Needs a strong, thick, sharp beak that can apply pressure and break shells Beak similar to pliers! Beak similar to forceps! Beak similar to needle-nose pliers! Beak similar to a heavy duty wire cutters!

9 Island 8 Based on questions 11 and 12, what can you conclude about different animals (even though they may be related) and the habitats they live in? Species Vary… Globally (think about the large, flightless birds on different continents) Locally (think about the various finches across the Galapagos Islands) Over Time (think about the various fossils Darwin found)

10 Island 9 Referring to the displayed fossils. Can you think of any modern day animals that resemble these fossils? Which animals? Fish Trilobite (Early Arthropod) Shells Clams Coral Plant leaf, petrified wood Deer antlers (not fossilized, Just old)  Darwin also found fossils that didn’t resemble any living organisms. How might this finding have affected his understanding of life’s diversity? “This wonderful relationship in the same continent between the dead and the living, will, I do not doubt, hereafter throw more light on the appearance of organic beings on our earth, and their disappearance from it, than any other class of facts.” ~ Darwin (Miller & Levine, Biology, p.453)

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