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

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Presentation on theme: "Biogeography of Marine Bacteria Francisco Rodríguez-Valera Universidad Miguel Hernandez Alicante, Spain."— Presentation transcript:

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

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5 Baas-Becking (1934) Alles is overal maar het milieu selecteert –All is everywhere but the environment select

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

8 Some problems inherent to Baas-Becking axiom Replacement rate under low selective pressure Identity of habitat

9 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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17 Culturability of bacteria from natural environments Planktonic marine bacteria –1 in 10 3 to 10 5 –50% metabolically active Soil bacteria –1 in 200

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20 Marine Crenarchaea

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24 ITS Primer 2 Spacer Region ITS 1500 bp3000 bp120 bp Primer 1

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

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