The correct sequence of ecosystems in order of decreasing productivity is
- Mangroves > 2. Grasslands > 3. Lakes > 4. Oceans
Mangroves These coastal ecosystems boast exceptionally high productivity due to several factors. They receive rich nutrients from both land and sea, have a warm climate, and benefit from tidal flushing that brings in fresh nutrients and removes waste products.
Grasslands These moderate-productivity ecosystems are characterized by abundant grasses and herbaceous plants. Their productivity depends on factors like rainfall, soil quality, and grazing pressure.
Lakes Freshwater lakes exhibit varying levels of productivity depending on the nutrient availability (oligotrophic - nutrient-poor, eutrophic - nutrient-rich). Generally, they are less productive than mangroves and grasslands.
Oceans Marine ecosystems, particularly open oceans, have the lowest overall productivity. Nutrient availability is limited in vast stretches of the ocean, leading to a slower rate of organic matter production compared to the other ecosystems listed.
