Species richness is greatest in tropical ecosystems. Tropical rain forests on land and coral reefs in marine systems are among the most biologically diverse ecosystems on Earth and have become the focus of popular attention.
Which ecosystem is the most productive?
On land the maximum primary production rate is found in tropical rainforests followed by tropical deciduous forests, temperate forests, savannah, temperate grasslands and desert scrub.
Which of the following ecosystem has more productivity?
In the aquatic ecosystem, coral reefs show the highest gross primary productivity. Large numbers of aquatic phototrophs and phytoplankton contribute to the productivity of the ecosystem.
Which world ecosystems are most productive in terms of biomass?
What units are used in this figure to quantify biomass accumulation? The most productive ecosystems are tropical rain forests and estuaries. The least productive ecosystems are desert and open ocean. The units to quantify biomass accumulation are 1,000/kcal/m2/year.
Which of the following ecosystems has the highest productivity of biomass?
In terms of NPP per unit area, the most productive systems are estuaries, swamps and marshes, tropical rain forests, and temperate rain forests (see Figure 4).
What ecosystem has the lowest productivity?
Deserts, tundra, and the deep ocean are the least productive ecosystems, typically having an energy fixation of less than 0.5 × 103 kilocalories per square meter per year (thousands of kcal/m2/yr; it takes one calorie to raise the temperature of one gram of water by 34°F [1°C] under standard conditions, and there are …
Which ecosystem has highest productivity Upsc?
Tropical rainforest have highest primary productivity and is least in desert.
What do ecologists mean by the term resilience in what ways might diversity contribute to resilience in an ecosystem?
What do ecologists mean by the term resilience? … Resilience means to either resists or recover quickly from disturbance. Diversity is the number of different species in an area or the number per unit area. Diversity is important because it indicates the variety of ecological niches and genetic variation in a community.
What are some examples of environmental changes that could create selection pressures for a species?
Predation, competition and disease are examples of selection pressures.
Can plants be keystone species?
Keystone species can also be plants. Mangrove trees, for instance, serve a keystone role in many coastlines by firming up shorelines and reducing erosion. They also provide a safe haven and feeding area for small fish among their roots, which reach down through the shallow water.