Testing water for pollution
Numéro d’image : 11750248
| MODEL RELEASED: A biologist checks the pollution level in a stream by monitoring both the animals living in it and the concentration of dissolved oxygen. Here,he is 'kick sampling',the standard method for collecting animals. He stands his net vertically and kicks the bottom mud 20 times just upstream of it. Loose material is displaced and washed into the net for collection and examination. This stream is badly polluted,hence he finds much sewage fungus but no animals except for a few bloodworms. The pollution is due to the oxidation of organic matter. The resulting low oxygen content encourages anaerobic growth but makes the water unsuitable for higher animals | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Hart-Davis, Adam |
| Taille de l’image : | 3624 px × 5455 px |
| Model Release : | Disponible |
| Property Release : | Non requis |
| Restrictions : | - |
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