BIOL 152 1st Edition Lecture 28 Outline of Last Lecture I. RitualizationII. CooperationIII. RelatednessIV. Sexual selectionV. Population ecology a. Trade offs and life history Outline of Current Lecture I. MetapopulationsII. Island diversity III. Kelp forestsCurrent LectureMetapopulations - Many populations grouped as one- Connected by migrants - Corridors: lines that allow the movement of one species to live with anotherConnected 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 alwaysIslands are not just in water- Suitable habitat surrounded by an unsuitable habitat for given speciesIsland 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 flowTrophic level- First- autotrophs (primary producers)- Anything above- heterotrophs Healthy kelp forest - 1m per day growth rate- Provide habitats for marine lifeo In contrast, urchin barrens found where you would usually find kelp EchinodermsPresence of sea urchins causes a top-down control because urchins eat the kelp (controlling the levels of
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