1Lecture 3: Jan. 9•What Determines Species Distributions?•Climate & Seasonality•Terrestrial Biomes•Oceanic HabitatsDiscussion Activity This WeekRewilding America- read article before you come to discussionGSI SLC Office HoursMaster Schedule PostedReading: Ch. 50: 1144-1164What factors determine species distributions?1.History & dispersal ability2. Behavior3.Biotic factors4.Abiotic factorsHistory & dispersal abilities often limit species distributionsPolar bears found in the Arctic, but not in Antarctica. WHY?Crested mynasintroduced by humansto Vancouver 1897,DIDN’T expandEuropean starlingsintroduced by humansto NY in 1890,HUGE range expansionHumans may alter natural dispersal patterns
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2Biotic factors often limit species distributionsYucca mothslimitedby yucca plantsEffects of predators on seaweed distributionBiotic factors often limit species distributionsAbiotic factors may limit species distributionsSuguarosonly found in southern AZ,where temperatures do not stay below freezing for > 36 hThe Earth’s climatic range reflects its location in our solar system’s habitable zone