JoVE - Journal of Visualized Experiments
JoVE Visualize
Contact Us
Esta página ha sido traducida por una máquina. Otras páginas pueden seguir apareciendo en inglés. View in English

Restricciones a la adaptación de las marismas al aumento acelerado del nivel del mar

  • 0School of Natural Sciences, Macquarie University, Sydney, NSW, Australia.
Clinical Neuroscience (new York, N.y.) +

|

28 de julio de 2022

|

28 de julio de 2022

Ver abstracta en PubMed

Resumen

Este resumen es generado por máquina.

Los pantanos de marea parecen resistentes al aumento del nivel del mar a medida que aumenta la acumulación de sedimentos con el aumento de las aguas. Sin embargo, el hundimiento del sustrato limita la ganancia de elevación, revelando la vulnerabilidad del pantano consistente con las observaciones anteriores.

Área De La Ciencia

  • Ecología
  • Geología
  • Ciencias del clima

Sus Antecedentes

  • Los ecosistemas de las marismas de marea se enfrentan a amenazas por el aumento relativo del nivel del mar.
  • Las evaluaciones anteriores de la resiliencia de los pantanos arrojaron resultados contradictorios basados en fuentes de datos.

Objetivo Del Estudio

  • Investigar la vulnerabilidad de los ecosistemas de las marismas de marea al aumento del nivel del mar utilizando datos globales contemporáneos.
  • Para conciliar los resultados contrastantes sobre la resiliencia de los pantanos mediante el examen de la acreción de sedimentos y el hundimiento de sustratos.

Principales Métodos

  • Análisis de datos contemporáneos distribuidos globalmente sobre la acumulación de sedimentos de pantanos y el aumento del nivel del mar.
  • Cuantificación del hundimiento del sustrato en relación con la acumulación de sedimentos.

Principales Resultados

  • Se encontró que la acumulación de sedimentos de pantano aumentaba en paralelo con el aumento del nivel del mar.
  • El hundimiento del sustrato mostró un aumento no lineal con la acreción, limitando la ganancia de elevación del pantano.
  • Se observaron déficits de ganancia de elevación, alineados con los datos de vulnerabilidad del pantano del Holoceno.

Conclusiones

  • Los datos contemporáneos sugieren la resiliencia del pantano al aumento del nivel del mar, pero esto se contrarresta al aumentar el hundimiento del sustrato.
  • Los hallazgos indican que las marismas son más vulnerables al aumento del nivel del mar de lo que sugerían anteriormente los datos de acreción contemporáneos.
  • La conciliación de datos contemporáneos y del Holoceno revela un patrón consistente de vulnerabilidad del pantano de marea bajo el aumento acelerado del nivel del mar.

Videos de Conceptos Relacionados

Responses to Drought and Flooding 02:41

10.9K

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.

Under normal conditions, water taken up by the plant evaporates from leaves and other parts in a process called transpiration. In times of drought stress, water that evaporates by transpiration far exceeds the water absorbed from the soil, causing plants to wilt. The general plant response to drought stress is the synthesis of hormone...

Effect of Sea Water on Concrete 01:22

404

Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks,...

Responses to Salt Stress 02:02

13.3K

Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.

Plant cell cytoplasm has a high solute concentration, which causes water to flow from the soil into the plant due to osmosis. However, excess salt in the surrounding soil increases the soil solute concentration, reducing the plant’s ability to take up...

Adaptations that Reduce Water Loss 01:57

26.2K

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

In land plants, the uppermost cell layer of a plant leaf, called the epidermis, is coated with a waxy substance called the cuticle. This hydrophobic layer is composed of the polymer cutin and...

Regulation of Water Output 01:26

395

The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...

Design Example: Maintaining Level of an Embankment 01:19

119

Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...