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Published byMaud Ball Modified over 9 years ago
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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 to Baas-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 10 3 to 10 5 –50% metabolically active Soil bacteria –1 in 200
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Marine Crenarchaea
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ITS Primer 2 Spacer Region ITS 1500 bp3000 bp120 bp Primer 1
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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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