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Lecture 3 - Lecture 3 Jan 9 What Determines Species...

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1 Lecture 3: Jan. 9 What Determines Species Distributions? Climate & Seasonality Terrestrial Biomes Oceanic Habitats Discussion Activity This Week Rewilding America - read article before you come to discussion GSI SLC Office Hours Master Schedule Posted Reading: Ch. 50 : 1144-1164 What factors determine species distributions? 1. History & dispersal ability 2. Behavior 3. Biotic factors 4. Abiotic factors History & dispersal abilities often limit species distributions Polar bears found in the Arctic, but not in Antarctica. WHY? Crested mynas introduced by humans to Vancouver 1897, DIDN’T expand European starlings introduced by humans to NY in 1890, HUGE range expansion Humans may alter natural dispersal patterns
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2 Biotic factors often limit species distributions Yucca moths limited by yucca plants Effects of predators on seaweed distribution Biotic factors often limit species distributions Abiotic factors may limit species distributions Suguaros only found in southern AZ, where temperatures do not stay below freezing for > 36 h The Earth’s climatic range reflects its location in our solar system’s habitable zone
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