Upsc Environment

2022-02-07 19:32:40 Mains answer writing practice

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2022-02-07 19:30:41 Factors Limiting the Productivity of Aquatic Habitats

Sunlight and oxygen are the most important limiting factors of the aquatic ecosystems.

Sunlight

Sunlight penetration rapidly diminishes as it passes down the column of water.

The depth to which light penetrates a lake determines the extent of plant distribution.

Suspended particulate matters such as clay, silt, phytoplankton, etc. make the water turbid.

Turbidity limits the extent of light penetration and photosynthetic activity in a significant way.

Based on light penetration and plant distribution they are classified as photic and aphotic zones. Open / Comment

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2022-02-07 17:30:49 Aquatic Organisms

The aquatic organisms are classified on the basis of their zone of occurrence.

Neuston: These organisms live at the air-water interface, e.g. floating plants.

Periphyton: These are organisms which remain attached to stems and leaves of rooted plants or substances emerging above the bottom mud such as sessile algae.

Plankton: Microscopic floating organisms such as algae, diatoms, protozoans and larval forms are called plankton. This group includes both microscopic plants like algae (phytoplankton) and animals like crustaceans and protozoans (zooplankton).

The locomotory power of the planktons is limited so that their distribution is controlled, largely, by currents in the aquatic ecosystems.

Nekton: This group contains powerful swimmers that can overcome the water currents.

Benthos: The benthic organisms are those found living at the bottom of the water mass Open / Comment

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2022-02-06 18:31:01 Aquatic Ecosystems

Aquatic ecosystems refer to plant and animal communities occurring in water bodies.

Aquatic ecosystems are classified into two subgroups: 1) Freshwater ecosystems, such as rivers, lakes and ponds; 2) Marine ecosystems, such as oceans, estuary and mangroves.

Aquatic ecosystems are classified on the basis of salinity into the following types:

Freshwater ecosystems: water on land which is continuously cycling and has low salt content (always less than 5 ppt) is known as fresh water.

There are two types of freshwater ecosystems: 1) Static or still water (Lentic) ecosystems, e.g. pond, lake, bogs and swamps. 2) Running water (Lotic) ecosystems, e.g. springs, mountain brooks, streams and rivers.

Marine ecosystems: the water bodies containing salt concentration equal to or above that of seawater (i.e., 35 ppt or above). E.g. shallow seas and open ocean.

Brackish water ecosystems: these water bodies have salt content in between 5 to 35 ppt. e.g. estuaries, salt marshes, mangrove swamps and forests. Open / Comment

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