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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


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biogeography of marine bacteria

Biogeography of Marine Bacteria

Francisco Rodríguez-Valera

Universidad Miguel Hernandez

Alicante, Spain

biogeography is the study of the geographical distribution of species
Biogeography is the study of the geographical distribution of species
  • Cosmopolitan-widespread geagraphic distribution
  • Endemic-only found at certain geographical areas
baas becking 1934
Baas-Becking (1934)
  • Alles is overal maar het milieu selecteert
    • All is everywhere but the environment select
prediction
Prediction
  • Similar habitats will harbour similar populations regardless of location
  • Highly relevant for biodiversity studies
some problems inherent to baas becking axiom
Some problems inherent toBaas-Becking axiom
  • Replacement rate under low selective pressure
  • Identity of habitat
problems specific to the study of bacterial biogiography
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
culturability of bacteria from natural environments
Culturability of bacteria from natural environments
  • Planktonic marine bacteria
    • 1 in 103 to 105
    • 50% metabolically active
  • Soil bacteria
    • 1 in 200
slide24

ITS

ITS

1500 bp

3000 bp

120 bp

Spacer Region

Primer 2

Primer 1

slide25

~ 420 pb

ITS

16S ~ 650 pb

23S ~ 75 pb

tRNA-Ile tRNA-Ala

ESQUEMA DEL AMPLICÓN DE RISA DE SAR11

Zonas hipervariables