Biogeography of IslandsSpecial things goon in islands• “island life” or“insular biology”Island biogeographyAdaptive radiations DispersalBiogeography of Islands‘Insular Syndrome’1. difficulties of LDD to islands2. isolation after establishment3. ecological opportunities4. moderation of maritime climate24 principlesAdaptive RadiationsAdaptive radiations - prevalent theme on islands• one of several processes that promote increase diversity in one lineagerelative to a sister groupOne lineage (clade 2) is morediverse due to combination ofspecies radiation and adaptationinto many ecological zones -perhaps due to the origin of anovel feature or open niches onislandsAdaptive RadiationsAdaptive radiations - prevalent theme on islands• species diversification from a common ancestral colonist is alreadybeen mentionedAdaptive RadiationsDarwin’s finchesAdaptive RadiationsAdaptive RadiationsDarwin’s finchesThe study of adaptive radiations - one problem!. . . as this field involves issues of both phylogenetics andecological modificationAdaptive RadiationsThe study of adaptive radiations - one problem!. . . telling the adaptive story of beak size, structure, function is done usingrelationships based on this featureCircular reasoning?Adaptive RadiationsThe study of adaptive radiations - one problem!• molecular phylogenetics criticalDarwin’s finches - what we thoughtDarwin’s finches - what we know!We will examine adaptive radiations later,in the context of the Hawaiian IslandsAdaptive radiationsAdaptive
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