Climate in the Past
In Sindh from 9,000 to 4,000 years ago, was warm and wet period which continue up till 3,800 years ago. Temperature were 2 - 3 °C higher than 1975, causing more rainfall, in winter. While 2,000 - 500 BC was cold period with low rainfall. Warm period with more rainfall from 400 to 650 AD and cold period with low rainfall continued 900 AD. From 1550 - 1850 AD it was cold period in Sindh and is known as Little Ice Age.
Effect of Climatic Changey
When ever climate become warm, the ultraviolet radiation increases, which decreases the population of phyto-plankton. Which is the source of food for aquatic animals especially fishes. The population of fresh water fishes and marine water fishes are reduced.
Sea anemone, sea urchin, sea horse, lobster, crab, sea cucumber and molluscs also reduce simultaneously.
Due to more ultraviolet radiation the sea-weeds photosynthesis reduced, as a results in the sea-weeds level of Iodine and potassium sulphate reduces. This means the food of aquatic fauna become deficient in Iodine and potassium sulphate.
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Climatic Change in the Past and Its Effect on Aquatic Fauna in Sindh, Pakistan.
More research papers: see Farzana Panhwar.
Last update: 04 October 2022
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