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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) Alles is overal maar het milieu selecteert –All is everywhere but the environment select
Prediction Similar habitats will harbour similar populations regardless of location Highly relevant for biodiversity studies
Some problems inherent to Baas-Becking axiom Replacement rate under low selective pressure Identity of habitat
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 Planktonic marine bacteria –1 in 10 3 to 10 5 –50% metabolically active Soil bacteria –1 in 200
ITS Primer 2 Spacer Region ITS 1500 bp3000 bp120 bp Primer 1
ITS ~ 420 pb tRNA-Ile tRNA-Ala ESQUEMA DEL AMPLICÓN DE RISA DE SAR11 Zonas hipervariables 16S ~ 650 pb 23S ~ 75 pb
Science 20 Unit D: Living Systems Evidence for Evolution.
POPULATION ECOLOGY. CONCEPT 52.2 INTERACTIONS BETWEEN ORGANISMS AND THE ENVIRONMENT LIMIT THE DISTRIBUTION OF SPECIES.
ISLAND BIOGEOGRAPHY. What is Island Biogeography? A field within biogeography the study of the distribution of species spatially and temporally Establishment.
POPULATION ECOLOGY. YOU MUST KNOW… HOW DENSITY, DISPERSION, AND DEMOGRAPHICS CAN DESCRIBE A POPULATION THE DIFFERENCES BETWEEN EXPONENTIAL AND LOGISTIC.
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Population Levels Optimum population Over population Under Population
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Evolution A population changes over time. Charles Darwin ( )
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GUADALUPE ISLAND: A CASE STUDY OF SPATIAL PROTECTION OF MARINE AND COASTAL BIODIVERSITY IN MEXICO Carlos R. Torres Mexico National Oceanographic Data Center/UBAC.
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