Biogeography of Marine Bacteria

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Biogeography of Marine Bacteria

• Francisco Rodríguez-Valera
• Universidad Miguel Hernandez
• Alicante, Spain

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Biogeography is the study of the geographical
distribution of species

• Cosmopolitan-widespread geagraphic distribution
• Endemic-only found at certain geographical areas

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Baas-Becking (1934)

• Alles is overal maar het milieu selecteert
• All is everywhere but the environment select

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Prediction

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

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Some problems inherent toBaas-Becking axiom

• Replacement rate under low selective pressure
• Identity of habitat

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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

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Culturability of bacteria from natural
environments

• Planktonic marine bacteria
• 1 in 103 to 105
• 50 metabolically active
• Soil bacteria
• 1 in 200

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Marine Crenarchaea
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420 pb
ITS

16S 650 pb
23S 75 pb
tRNA-Ile tRNA-Ala
ESQUEMA DEL AMPLICÓN DE RISA DE SAR11
Zonas hipervariables
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