Biogeography of Marine Bacteria - PowerPoint PPT Presentation

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biogeography of marine bacteria l.
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Biogeography of Marine Bacteria

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  1. Biogeography of Marine Bacteria Francisco Rodríguez-Valera Universidad Miguel Hernandez Alicante, Spain

  2. Biogeography is the study of the geographical distribution of species • Cosmopolitan-widespread geagraphic distribution • Endemic-only found at certain geographical areas

  3. Baas-Becking (1934) • Alles is overal maar het milieu selecteert • All is everywhere but the environment select

  4. Prediction • Similar habitats will harbour similar populations regardless of location • Highly relevant for biodiversity studies

  5. Some problems inherent toBaas-Becking axiom • Replacement rate under low selective pressure • Identity of habitat

  6. Problems specific to the study of bacterial biogiography • Sampling • (how many species of bacteria there are?) • Definition of bacterial species • Establishing identity and degree of relatedness

  7. Culturability of bacteria from natural environments • Planktonic marine bacteria • 1 in 103 to 105 • 50% metabolically active • Soil bacteria • 1 in 200

  8. Marine Crenarchaea

  9. ITS ITS 1500 bp 3000 bp 120 bp Spacer Region Primer 2 Primer 1

  10. ~ 420 pb ITS 16S ~ 650 pb 23S ~ 75 pb tRNA-Ile tRNA-Ala ESQUEMA DEL AMPLICÓN DE RISA DE SAR11 Zonas hipervariables