What happens to productivity as rainfall increases? As rainfall increases the rate of plant tissue production slowly decreases. … Since plants need sunlight in order to photosynthesize the amount they receive would definitely affect their productivity.
Net primary productivity varies among ecosystems and depends on many factors. These include solar energy input, temperature and moisture levels, carbon dioxide levels, nutrient availability, and community interactions (e.g., grazing by herbivores) 2.
What happens to the amount of available oxygen as you get deeper in the ocean? You can see that oxygen is decreasing at a steady rate right up to 100 meters. Then, onward it starts significantly decreasing.
A high primary productivity rate in the ecosystems is obtained when the physical factors (for instance: water, nutrients and climate) are favourable. The presence of some forms of secondary energy can also help to increase the primary productivity rate.
Lack of water is the main limit on primary production on the Earth’s surface. It has been found that in any area where there is an adequate water supply there will be a large amount of primary production. Water is primarily supplied through rain and the Earth’s weather system.
Photosynthetic organisms dramatically increased atmospheric oxygen levels between 2 and 2.5 billion years ago. This change created selective pressure favoring organisms that used oxygen to produce energy-containing molecules.
The biomes with the lowest levels of primary productivity include deserts, the tundra, the open ocean, and the lakes and streams biome.
-if ample sunlight and water are available, the primary productivity of an ecosystem may be limited by the availability of nutrients. … Every organism needs nutrients to build tissues ad carry out life functions. Like water, nutrients pass through organisms and the environment through biogeochemical cycles.
By what 2 processes is water cycled from land to the atmosphere? Chemical processes and physical processes are how water is cycled from land to the atmosphere. Describe 1 way in which water from the ocean may make 1 complete cycle through the atmosphere and back to the ocean. Ocean water evaporates into water vapor.
The grass is the producer, so if it died the consumers that feed on it – rabbits, insects and slugs – would have no food. They would starve and die unless they could move to another habitat. All the other animals in the food web would die too, because their food supplies would have died out.
Abiotic factors like solar radiation and nutrients, and biotic factors like zooplankton predation may affect ocean primary productivity. Productivity varies with the season, and also locally and globally.
Ocean temperature was identified as a likely driver of productivity, with reduced NPP and standing stock observed in warmer waters. Light availability was also strongly linked with carbon accumulation and storage, with increased light levels positively correlated with NPP and standing stock.
After the construction of the dam, the suspended matter of the water body reduced in the upstream section and the transparency increased due to the decrease of water flow velocity, which slows down the attenuation of light intensity in the water and greatly improves the primary productivity.
In ocean, sunlight is the main limiting factor which decreases the rate of photosynthesis. … Minerals and nutrients can also be a retarding factor based on location of the oceans.So, there will be less productivity than land which is 170 billion tons compared to 55 billion tons ion oceans.
We focus on two major variables—light and nutrients—and their role in determining primary production.
The greater the number of species and number of interactions/complexity, the greater the biodiversity and ability of an ecosystem or habitat to survive and adapt to environmental pressures. Ecological productivity is a measure of the rate of generation of biomass or carbon per area of habitat or ecosystem.
Oxygen and the Early Earth
It was not until the evolution of cyanobacteria (photosynthetic bacteria) that oxygen was released into the atmosphere. Over billions of years, photosynthesis led to an increase of oxygen in the atmosphere.
These photosynthetic organisms were so plentiful that they changed the biosphere. Over a long period of time, the atmosphere developed a mix of oxygen and other gases that could sustain new forms of life. The addition of oxygen to the biosphere allowed more complex life-forms to evolve.
Two and a half billion years ago, single-celled organisms called cyanobacteria harnessed sunlight to split water molecules, producing energy to power their cells and releasing oxygen into an atmosphere that had previously had none.
At a depth of 1000 m, liquid CO2 is about 6% less dense than seawater. Because liquid CO2 is more compress- ible than seawater, at a depth of 3000 m its density is similar to that of seawater. Thus liquid CO2 would be positively buoyant and rise if it were injected above 3000 m, but it would sink if injected deeper.
Water molecules are made up of two hydrogen atoms and one oxygen atom. … Ocean waters rich in heavy oxygen: During ice ages, cooler temperatures extend toward the equator, so the water vapor containing heavy oxygen rains out of the atmosphere at even lower latitudes than it does under milder conditions.
|GASES IN AIR AND DISSOLVED IN SEA WATER AT EQUILIBRIUM WITH AIR|
|The percentage of gases in sea water is based on the total gases dissolved in sea water at equilibrium with air.|
|Carbon Dioxide||CO 2||0.033|
The solubility of oxygen and other gases will decrease as temperature increases 9. This means that colder lakes and streams can hold more dissolved oxygen than warmer waters. If water is too warm, it will not hold enough oxygen for aquatic organisms to survive.
Upwelling. The most productive waters of the world are in regions of upwelling. Upwelling in coastal waters brings nutrients toward the surface. Phytoplankton reproduce rapidly in these conditions, and grazing zooplankton also multiply and provide abundant food supplies for nekton.
Coral reefs’ high productivity has been attributed mainly to photosymbioses between the coral animal and algae of the family Symbiodiniaceae, with recognition that the host can increase algal photosynthesis by concentrating nutrients and enhancing the efficiency of light absorption.
what factors other than water might affect primary productivity
describe what happens to the amount of available oxygen as you get deeper in the ocean
which group of organisms is always found at the base of a food chain or food web
what are the two primary sources of energy that power living systems?
the series of steps in which a large fish eats a small fish that has eaten algae is a
nutrients move through an ecosystem in