Video Experimental Relacionado

Updated: Jun 18, 2026

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems

Published on: October 29, 2016

Cambios en la estequiometría del lago N:P y la limitación de nutrientes impulsados por la deposición de nitrógeno

James J Elser¹, Tom Andersen, Jill S Baron

¹School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA. j.elser@asu.edu

Science (New York, N.Y.)

|November 7, 2009

Resumen

La deposición de nitrógeno atmosférico altera las proporciones de nutrientes del lago, cambiando el crecimiento del fitoplancton de la limitación de nitrógeno a la limitación de fósforo. Esto pone de relieve el impacto generalizado de las actividades humanas en los ecosistemas acuáticos.

Área de la Ciencia:

Ciencias del medio ambiente Ciencias del medio ambiente.
Ecología Ecología Ecología.
Limología Limología.

Sus antecedentes:

Las actividades humanas han aumentado significativamente el ciclo global del nitrógeno (N).
La deposición atmosférica de nitrógeno (N) es una vía importante para la entrada antropogénica de N en los ecosistemas.

Objetivo del estudio:

Para investigar el impacto de la deposición de nitrógeno atmosférico (N) en la limitación de nutrientes en los lagos.
Para determinar cómo las relaciones alteradas de nitrógeno (N) y fósforo (P) afectan el crecimiento del fitoplancton.

Principales métodos:

Análisis de las proporciones estequiométricas de nitrógeno (N) y fósforo (P) en lagos de Noruega, Suecia y Colorado.
Observación de los cambios en los patrones ecológicos de limitación de nutrientes.

Principales resultados:

La deposición atmosférica de N aumentó la relación N:P en los lagos estudiados.
El crecimiento del fitoplancton pasó de ser limitado por nitrógeno (N) a ser limitado por fósforo (P) en lagos de alta deposición de N.

Conclusiones:

El enriquecimiento antropogénico de nitrógeno (N) altera los procesos ecológicos fundamentales en los lagos.
Estas alteraciones afectan el ciclo biogeoquímico, la dinámica trófica y la biodiversidad, incluso en lagos remotos.

Más Videos Relacionados

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

The Benthic Exchange of O₂, N₂ and Dissolved Nutrients Using Small Core Incubations

Published on: August 3, 2016

Videos de Conceptos Relacionados

Freshwater Microbial Ecology

Freshwater Microbial Ecology

Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...

The Nitrogen Cycle

The Nitrogen Cycle

Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...

Overview of Nitrogen Metabolism

Overview of Nitrogen Metabolism

Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this nitrogen...

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

Microbes and the Nitrogen Cycle

Microbes and the Nitrogen Cycle

The nitrogen cycle is a complex biogeochemical process critical to maintaining the balance of nitrogenous compounds in ecosystems. This cycle involves multiple microbial-mediated transformations through which nitrogen changes oxidation states, supporting essential ecological functions and contributing to plant and microbial growth.Nitrogen Fixation and AmmonificationNitrogen fixation initiates the cycle by converting inert atmospheric nitrogen (N₂) into bioavailable ammonia (NH₃), a process...

What are Biogeochemical Cycles?

What are Biogeochemical Cycles?

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.