BIOL 152 1st Edition Lecture 28 Outline of Last Lecture I Ritualization II Cooperation III Relatedness IV Sexual selection V Population ecology a Trade offs and life history Outline of Current Lecture I Metapopulations II Island diversity III Kelp forests Current Lecture Metapopulations Many populations grouped as one Connected by migrants Corridors lines that allow the movement of one species to live with another Connected patches have higher diversity and lower extinction rate 46 14 Habitat fragmentation 46 15 Severely impacts forest biodiversity and survivorship bigger is better for diversity But not always Islands are not just in water Suitable habitat surrounded by an unsuitable habitat for given species Island diversity is a balance between species arrival and extinction 46 16 The bigger island the more species 46 17 Real world evidence 46 18 Cuba vs Redonda island size These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Distance has a similar effect to size except extinction rates are constant 46 17 Keystone species plants or animals that play an important role in the ecosystem Food web 47 14 Food chain is too simplistic to truly represent the flow Trophic level First autotrophs primary producers Anything above heterotrophs Healthy kelp forest 1m per day growth rate Provide habitats for marine life o In contrast urchin barrens found where you would usually find kelp Echinoderms Presence of sea urchins causes a top down control because urchins eat the kelp controlling the levels of kelp
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