Chapters 10 and 11

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kamrunsreno
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244750
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Chapters 10 and 11
Updated:
2013-11-03 17:04:05
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Chapter 10 11
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Biogeography
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  1. Carolus Linnaeus
    • Developed the hierarchical classification scheme that is still used today (Linnaean system)
    • Believed in special creation, so evolution was not considered when he classified organisms.
  2. Linnaean System
    • classifications built off similarities.
    • under this system, birds would be placed in their own order, because nothing else resembles them.
  3. Three Main Methods of Systematics
    • Evolutionary Systematics
    • Numerical Phenetics
    • Phylogenetic Systematics
  4. Evolutionary Systematics
    • Classification involving relatedness as well as morphological diversity (overall similarity)
    • Endorsed by Ernst Mayr and George G. Simpson
  5. Numerical Phenetics (Numerical Taxonomy)
    • Based on similarities and differences among taxa
    • All characters are given equal weight (not realistic)
    • Lots of characters, lots of math
  6. Phylogenetic Systematics
    • Identifying and understanding evolutionary relationships among the many different kinds of life on earth, both living and non living\
    • Relationships established by phylogenetic systematics often describe a species' evolutionary history and its phylogeny.
  7. Phylogenetics
    The study of ancestor/descendant relationships among taxa revealing "family trees" of taxa
  8. Willi Hennig
    • Father of phylogenetic systematics.
    • Systematics should reflect the known evolutionary history of lineages as closely as possible.
  9. Hennig's Auxiliary Principle
    Never presume convergent or parallel evolution; always presume homology
  10. Relative Apomorphy Rule
    • (outgroup comparison)
    • Homologous characters found only in the in-group are apomorphic (derived) while homologous characters shared with a sister group are plesiomorphic (basal/primitive or ancestral state)
  11. Grouping Rule
    Only synapomorphies provide evidence of common ancestry.
  12. Inclusion/Exclusion Rule
    Information from two transformation series can be combined into a single hypothesis of relationship if that information allows for the complete inclusion or exclusion of groups which fomred by the separate transformation series.
  13. Monophyletic grouping
    All species share a common ancestor, and all species derived from that common ancestor are included. This is the only form of grouping accepted as valid by cladists
  14. Paraphyletic grouping
    All species share a common ancestor, but not all species derived from that common ancestor are included
  15. Polyphyletic grouping
    Species that do not share an immediate common ancestor are lumped together, while excluding other members that would link them.
  16. Cain's rule of thumb
    Criteria used/aused for indicating center of origin of taxon
    • 1. Location of greatest differentiation of a type (greatest number of species)
    • 2.Location of dominance or greatest abundance of individuals (most successful area)
    • 3.Location of synthetic or closely related forms (primitive and closely related forms)
    • 4. Location of maximum size of individuals
  17. Panbiogeography
    • Croizat
    • Importance of styding multiple groups to determine biotic patterns
    • Noted similar patterns of disjunction
    • Drew "tracks" to indicate historical connections
  18. Vicariance Biogeography
    • Nelson and Platnick
    • Phylogeny of taxa will match the historical relationships among geographic localities if speciation resulted from vicariant events.
    • This is not expected to hold if isolation resulted from jump dispersal
  19. Phylogenetic Biogeography
    • Brundin
    • importance of rigorous and objective methods in the analysis of biogeographic data
    • Strongly advocated for the application of Hennigian Cladistics
  20. Biogeographic Histories: Hawaii
    • Some show a simple progression of old island colonization and subsequent colinization of newer islands in order they emerged.
    • Others reveal more complex patterns of colonization across the archipelago.

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