Name: nutrient recycling in ecosystems
Uploaded: 2019-03-11T09:21:40.000Z
Duration: 54 s
Channel: JoVE

K12 Standards

north-carolina-k-12-science-standard-course-of-study

North Carolina K-12 Science Standard Course of Study

9-12

Biology

ecosystems-interactions-energy-and-dynamics

Ecosystems- Interactions, Energy, and Dynamics

LS.Bio.4.1

What are Biogeochemical Cycles?

La matière qui compose les organismes vivants est conservéeet recyclée dans les facteurs biotique, le vivant,et l'abiotique, le non vivant, dans l'environnement,un processus appelé cycle biogéochimique. 
Quatre composés, ou molécules, eau, carbone,l'azote et le soufre ont des formes gazeusesqui parcourent le cycle terrestre à la foiset les écosystèmes aquatiques, ainsi que l'atmosphère,les intégrant dans les processus biogéochimiques globaux. 
Cependant, les éléments qui sont trop lourdspour se produire sous forme de gaz,comme le phosphore, ne circulent quedans le milieu terrestre et les écosystèmes aquatiques,un processus biogéochimique local. 
Recyclage biogéochimique local et mondialsont reliés par des processus géologiques,comme le soulèvement des plaques tectoniques,l'altération et l'érosion des dépôts rocheuxet le drainage de l'eau.

Michalak, Anna M., Eric J. Anderson, Dmitry Beletsky, Steven Boland, Nathan S. Bosch, Thomas B. Bridgeman, Justin D. Chaffin, et al. « Prolifération d’algues record dans le lac Érié causée par des tendances agricoles et météorologiques compatibles avec les conditions futures attendues ». Actes de l’Académie nationale des sciences 110, n° 16 (16 avril 2013) : 6448-52. [<a href="https://doi.org/10.1073/pnas.1216006110 » target="__blank">Source</a>]

Rousk, Johannes et Per Bengtson. « Régulation microbienne des cycles biogéochimiques mondiaux. » Frontiers in Microbiology 5 (14 mars 2014). [<a href="https://doi.org/10.3389/fmicb.2014.00103 » target="__blank">Source</a>]

que sont les cycles biogéochimiques ?

Les éléments les plus courants dans les molécules organiques, le carbone, l’hydrogène, l’oxygène, l’azote, le soufre et le phosphore, ne sont disponibles dans l’écosystème qu’en quantités limitées. Par conséquent, ces nutriments doivent être recyclés par les constituants biotiques et abiotiques de l’écosystème, au cours de processus généralement appelés cycles biogéochimiques.
 
 <h4>Cycles biogéochimiques et décomposition</h4>
 
 La matière qui constitue des organismes vivants, comme l’eau, le carbone, l’azote, le soufre et le phosphore, existe en quantités limitées au sein de l’écosystème et doit être conservée et recyclée. Cette matière peut prendre diverses formes chimiques et passer de longues périodes dans l’atmosphère, sur ou sous la terre, et dans les milieux aquatiques. Un élément clé dans la dégradation et le recyclage des nutriments dans l’écosystème est la décomposition, qui est influencée par la température, l’humidité et la disponibilité des nutriments. Par exemple, les matières organiques sont décomposées beaucoup plus rapidement dans les forêts tropicales que dans les milieux tempérés, où les températures sont plus basses et les climats saisonniers.
 
 <h4>Activité humaine</h4>
 
 Les activités humaines peuvent également jouer un rôle majeur dans la modification de l’équilibre des cycles biogéochimiques. Par exemple, en 2011, le lac Érié a connu la plus grande prolifération d’algues nuisibles de son histoire. Cette situation est le résultat de l'apport de phosphore par l'agriculture pendant de nombreuses années, associé à des changements dans les régimes climatiques locaux. Les niveaux excessifs d’éléments nutritifs, qu’on appelle eutrophisation, ont favorisé la croissance de deux espèces toxiques de cyanobactéries, Microcystis et Anabaena.

Que sont les cycles biogéochimiques ?

Les éléments les plus courants dans les molécules organiques, le carbone, l’hydrogène, l’oxygène, l’azote, le soufre et le phosphore, ne sont disponibles dans l’écosystème que dans un nombre limité de ...

Education

Enseignement

JoVE Core

Biologie

Ecology

Écologie

Ecosystems

Écosystèmes

KEY TERMS AND CONCEPTS

TERMES ET CONCEPTS CLÉS

nutrient recycling in ecosystems

Nutrient recycling in ecosystems keeps the elements needed for life moving through living and nonliving parts of the environment. Elements such as water, carbon, nitrogen, sulfur, and phosphorus are present in limited amounts, so they must be conserved and reused. These movements are called biogeochemical cycles.

These nutrients can exist in several chemical forms. They may spend long periods in the atmosphere, on land, under the land, or in aquatic environments. Decomposition is a key part of this recycling process. It breaks down organic material and returns nutrients to the ecosystem.

Decomposition depends on temperature, moisture, and nutrient availability. In warm, wet places, organic matter usually breaks down faster. For example, rainforest material decomposes more quickly than material in temperate environments, which are cooler and more seasonal.

Human activity can also disrupt these cycles. In Lake Erie, years of phosphorus added through agriculture, along with changes in local weather patterns, helped create the largest harmful algal bloom in the lake’s recorded history in 2011. This nutrient buildup, called eutrophication, supported the growth of toxic cyanobacteria such as Microcystis and Anabaena.

Nutrient Recycling in Ecosystems

what is an ecosystem?

Ecosystem Zones and Climate

Ecosystems are shaped by living and nonliving parts of an environment, and they can be grouped as terrestrial or aquatic. Terrestrial ecosystems depend on climate. Aquatic ecosystems are divided into freshwater and marine systems, and depth affects water temperature and how much sunlight reaches the water. Terrestrial ecosystems are called biomes. A biome is defined by climate and by the organisms that live there. Near the equator, rainforests have high, aseasonal temperatures and high annual...

trophic levels

Food Chains and Energy Flow

Food chains show how energy and nutrients move through an ecosystem. Each organism holds a trophic level, or a specific place in that chain. The lowest level includes primary producers, which make their own food using energy from the sun or from chemicals. Organisms at the next levels are heterotrophs, which get energy from other organisms below them. Primary consumers are herbivores, and they feed on autotrophs, also called primary producers. Secondary and tertiary consumers are carnivores...

primary production

GPP, NPP, and Ecosystem Energy

Gross primary production and net primary production describe how energy enters and moves through ecosystems. Primary producers, or autotrophs, make their own food. They can do this by photosynthesis or chemosynthesis, and they can also gain energy by consuming other organisms. The rate at which producers capture and store this energy is called gross primary production, or GPP. Not all of the energy in GPP stays available to the rest of the ecosystem. Primary producers use some energy for...

production efficiency

Energy Transfer as Biomass Efficiency

Net production efficiency shows how much energy organisms turn into biomass for the next trophic level. It focuses on the usable energy stored in body tissue, not the energy lost as heat or excreted wastes. This makes it a key idea for understanding energy flow through ecosystems. As energy moves from one organism to the next, only biomass can serve as food for the next trophic level. The rest of the energy is used in metabolism and is lost over time. Net production efficiency, or NPE, is the...

trophic efficiency

Energy Loss in Food Chains

Trophic level transfer efficiency describes how much energy moves from one level of a food chain to the next. It shows why energy drops sharply as organisms eat and are eaten. In most ecosystems, only about 10% of the energy passes on. This energy loss follows the second law of thermodynamics. In living systems, much of the energy is lost as metabolic heat during respiration. Trophic level transfer efficiency, or TLTE, measures this transfer by comparing the energy produced at one trophic...

what are biogeochemical cycles?

Nutrient recycling in ecosystems keeps the elements needed for life moving through living and nonliving parts of the environment. Elements such as water, carbon, nitrogen, sulfur, and phosphorus are present in limited amounts, so they must be conserved and reused. These movements are called biogeochemical cycles. These nutrients can exist in several chemical forms. They may spend long periods in the atmosphere, on land, under the land, or in aquatic environments. Decomposition is a key part of...

the water cycle

Water Movement Through Earth Systems

Water movement through Earth systems connects the hydrosphere, the atmosphere, the land, and living things. The hydrosphere includes every place where water is stored or moves. Because water supports living processes, its movement is important for ecosystem dynamics. The cycle starts when the sun warms surface water on land and in the oceans. That water evaporates and enters the atmosphere as vapor. Water can also move into the air by sublimation, which is ice changing directly into vapor, and...

the carbon cycle

Carbon Movement in Living Systems

Carbon moves through living systems and Earth over short and long time scales. It is the basis of all organic matter on Earth, and it cycles through ecosystems by passing between organisms and by moving through rocks, oceans, and the atmosphere. Human activities, including farming and burning fossil fuels, have changed this balance. In the biological carbon cycle, carbon dioxide in the atmosphere reacts with water to form bicarbonate. Primary producers, or autotrophs, use carbon dioxide and...

the nitrogen cycle

Nitrogen in Soil and Living Things

Nitrogen in soil and living things moves through ecosystems in several forms. Nitrogen atoms are found in proteins and DNA. Most animals and plants cannot use nitrogen gas, which is the main form of nitrogen on Earth. Nitrogen must first be changed into a usable form by nitrogen-fixing bacteria before it can move through food webs. About 78% of the air we breathe is nitrogen gas, but few organisms can use it in that form. Nitrogen fixation changes nitrogen gas (N2) into ammonia (NH3).

the phosphorus cycle

Phosphorus Movement in Soil and Water

Phosphorus moves through ecosystems mostly as phosphate ions in soil, water, sediment, and rocks. Unlike carbon, water, and nitrogen, it is not found in the atmosphere as a gas. It is also often a limiting nutrient, which means it is in short supply in many environments. Phosphorus is important in DNA, cell membranes, bones, and teeth. It is found in minerals, sediment, volcanic ash, and aerosols. As rocks and sediment weather over time, they release inorganic phosphate. That phosphate then...

the sulfur cycle

Sulfur in Ecosystems and Acid Rain

Sulfur moves through ecosystems as part of the chemical cycle that supports life. It is an important element in proteins and in amino acids such as cysteine, which helps give proteins their structure. On land, sulfur reaches ecosystems in several ways. Weak sulfuric acid can fall with precipitation, sulfur can drop directly from the atmosphere, rocks can weather and release sulfur, and geothermal vents can add it as well. Plants and microorganisms take sulfur up from the soil and change it...

bioremediation

Bioremediation in Soil and Oil Cleanup

Bioremediation uses prokaryotes, fungi, or plants to remove pollutants from the environment. It is a practical way to reduce harmful chemicals in contaminated soil and water. In agriculture, fertilizers and pesticides can leach into groundwater, streams, and lakes. Microbes and bacteria can help break down these toxins. One example is atrazine, an environmental toxin found in many fertilizers, which can be removed from soils by the bacterial species Rhizobium and Tricoderma sp. Bioremediation...

key terms and concepts

Learn how nutrients move through ecosystems, how decomposition returns matter to the environment, and how human activity can upset biogeochemical cycles.

Nutrient Recycling in Ecosystems | JoVE K12

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LS.Bio.4.2

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Earth's Systems

ESS.EES.2.4

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ESS.EES.3.4

ESS.EES.4.1

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3.3.9-12.L

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Matter and Energy in Organisms and Ecosystems

3.1.9-12.H

3.1.9-12.K

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Ecosystems: Interactions, Energy And Dynamics

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BIO.8

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112.49.c.11

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112.49.c.12.

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HS-LS2-3

Arizona Science Standards

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HS+B.L2U1.3

HS.L2

HS.L2U1.21

Alabama Course of Study Science

Ecosystems: Interactions Energy and Dynamics

9-12.B.2.7

9-12.EVS.1.2

Earth and Human Activity

9-12.EVS.4.9

Next Generation Science Standards

HS-LS2-5

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HS-ESS3-1

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SC.912.E.7

SC.912.E.7.1

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HS-LS2-3.

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SEN1.

SEN1.d

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SO6.

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The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited ...

The Water Cycle

The Earth&rsquo;s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, ...

The Carbon Cycle

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among ...

Use models to illustrate how processes in organisms contribute to the flow of energy and the cycling of matter within an ecosystem.

Analyze the relationships between matter and energy within ecosystems.

Nutrient Recycling in Ecosystems

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