Video Experimental Relacionado
Updated: Dec 31, 2025
07:59
Coral Reef Arks: An In Situ Mesocosm and Toolkit for Assembling Reef Communities
Published on: January 6, 2023
4.1K
Reconciliación del presupuesto de carbono en la zona crepuscular del océano
Sarah L C Giering1, Richard Sanders2, Richard S Lampitt2
11] National Oceanography Centre, University of Southampton, Waterfront Campus, European Way, Southampton SO14 3ZH, UK [2] Ocean and Earth Sciences, University of Southampton, European Way, Southampton SO14 3ZH, UK [3] Institute of Biological and Environmental Sciences, Oceanlab, University of Aberdeen, Newburgh AB41 6AA, UK.
Nature
|March 28, 2014
Resumen
La fotosíntesis oceánica exporta carbono a las profundidades marinas, pero su destino no está claro. Los microbios, ayudados por el zooplancton, son la clave para remineralizar este carbono orgánico que se hunde en la zona crepuscular.
Área de la Ciencia:
- Biología marina Biología marina.
- Oceanografía La oceanografía es la oceanografía.
- Biogeoquímica La biogeoquímica es la bioquímica.
Sus antecedentes:
- La fotosíntesis de la superficie del océano genera un carbono orgánico significativo, con una porción exportada a las profundidades del mar.
- La tasa de remineralización del carbono que se hunde controla el almacenamiento de carbono oceánico, pero los presupuestos de carbono siguen siendo desequilibrados.
- Comprender el equilibrio entre la oferta y la demanda de carbono de la biota de aguas profundas es crucial.
Objetivo del estudio:
- Para cuantificar las fuentes de carbono y los sumideros en la zona crepuscular del océano.
- Para determinar el papel de diferentes organismos en la remineralización del carbono.
- Para dilucidar los mecanismos que controlan el almacenamiento de carbono oceánico.
Principales métodos:
- Mediciones de campo de las tasas de exportación y remineralización de carbono.
- Estimación de las tasas de respiración de los organismos heterotróficos.
- Aplicación de un modelo de estado estacionario para equilibrar los presupuestos de carbono.
Principales resultados:
- Las fuentes y sumideros de carbono se equilibraron dentro de las incertidumbres observacionales en la llanura abisal del puercoespín.
- Los procariotas representaron el 7092% de la remineralización en la zona crepuscular (501,000m).
- El zooplancton fragmenta las partículas que se hunden, liberando más materia orgánica que alimenta el bucle microbiano.
Conclusiones:
- El bucle microbiano del océano profundo es estimulado significativamente por la interacción entre los microbios y el zooplancton.
- Esta sinergia juega un papel crítico en la regulación de la capacidad del océano como sumidero de carbono.
- Un presupuesto de carbono preciso requiere considerar las actividades combinadas de los microbios y el zooplancton en el procesamiento de partículas.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:06Primary Production
25.0K
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.
25.0K
01:28Carbon-dioxide Fixation
540
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
540
01:26Oxygenic Photosynthesis
635
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
635
01:14The Carbon Cycle
43.0K
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 living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
43.0K
00:51Energy Budgets
10.5K
Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
10.5K
01:50Global Climate Change
28.4K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
28.4K