MARINE AND FRESHWATER
WATER IS A MICROBIAL HABITAT
![GASES](http://static7.depositphotos.com/1030113/724/v/950/depositphotos_7241504-Carbon-dioxide-earth-map-on-oxygen.jpg)
GASES
LIGHT
NUTRIENT CYCLING
FRESHWATER ECOSYSTEM
IN GALCIER AND FROZEN LAKE
![IN STREAMS AND RIVER](http://3.bp.blogspot.com/-1Qhd3Q7KUKU/ULjEqUBMLgI/AAAAAAAALOs/BYwFoYEcgYE/s1600/Stream.jpg)
IN STREAMS AND RIVER
IN LAKES
MARINE ECOSYSTEM
IN ESTUARIES & SALT MARSHES
WINOGRADSKY COLUMN
IN OPENING OCEAN
AQUATIC VIRUSES
IN BENTHIC MARINE ENVIRONMENT