Biogeography of marine bacteria
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Biogeography of Marine Bacteria Francisco Rodríguez-Valera Universidad Miguel Hernandez Alicante, Spain Biogeography is the study of the geographical distribution of species Cosmopolitan-widespread geagraphic distribution Endemic-only found at certain geographical areas Baas-Becking (1934)

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Biogeography of marine bacteria l.jpg

Biogeography of Marine Bacteria

Francisco Rodríguez-Valera

Universidad Miguel Hernandez

Alicante, Spain


Biogeography is the study of the geographical distribution of species l.jpg
Biogeography is the study of the geographical distribution of species

  • Cosmopolitan-widespread geagraphic distribution

  • Endemic-only found at certain geographical areas


Baas becking 1934 l.jpg
Baas-Becking (1934) of species

  • Alles is overal maar het milieu selecteert

    • All is everywhere but the environment select


Prediction l.jpg
Prediction of species

  • Similar habitats will harbour similar populations regardless of location

  • Highly relevant for biodiversity studies


Some problems inherent to baas becking axiom l.jpg
Some problems inherent to of speciesBaas-Becking axiom

  • Replacement rate under low selective pressure

  • Identity of habitat


Problems specific to the study of bacterial biogiography l.jpg
Problems specific to the study of bacterial biogiography of species

  • Sampling

    • (how many species of bacteria there are?)

  • Definition of bacterial species

  • Establishing identity and degree of relatedness


  • Culturability of bacteria from natural environments l.jpg
    Culturability of bacteria from natural environments of species

    • Planktonic marine bacteria

      • 1 in 103 to 105

      • 50% metabolically active

    • Soil bacteria

      • 1 in 200


    Slide20 l.jpg

    Marine Crenarchaea of species


    Slide24 l.jpg

    ITS of species

    ITS

    1500 bp

    3000 bp

    120 bp

    Spacer Region

    Primer 2

    Primer 1


    Slide25 l.jpg

    ~ 420 pb of species

    ITS

    16S ~ 650 pb

    23S ~ 75 pb

    tRNA-Ile tRNA-Ala

    ESQUEMA DEL AMPLICÓN DE RISA DE SAR11

    Zonas hipervariables


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