Video Experimental Relacionado
Updated: Jul 5, 2026
09:33
An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
Published on: December 17, 2018
El movimiento del mercurio acuático a través de las redes alimentarias terrestres
Daniel A Cristol1, Rebecka L Brasso, Anne M Condon
1Institute for Integrative Bird Behavior Studies, Department of Biology, College of William and Mary, Williamsburg, VA 23185, USA. dacris@wm.edu
Science (New York, N.Y.)
|April 19, 2008
Resumen
La contaminación por mercurio de los ríos está entrando en los ecosistemas terrestres. Las aves cantoras terrestres muestran altos niveles de mercurio, principalmente por el consumo de arañas contaminadas, lo que plantea riesgos potenciales para la salud.
Área de la Ciencia:
- Ciencias del medio ambiente Ciencias del medio ambiente.
- Ecotoxicología Ecotoxicología.
- Biología de la Vida Silvestre Biología de la Vida Silvestre
Sus antecedentes:
- Los ríos de todo el mundo están contaminados con mercurio, lo que afecta la vida acuática y la salud humana.
- Las aves acuáticas se utilizan a menudo como indicadores de contaminación por mercurio.
- El mercurio puede transferirse de los ecosistemas acuáticos a los terrestres a través de vías tróficas.
Objetivo del estudio:
- Para investigar los niveles de mercurio en las aves terrestres cerca de un río contaminado.
- Para determinar las fuentes dietéticas de mercurio en las aves cantoras terrestres.
- Para evaluar el riesgo de biomagnificación de mercurio en las redes alimentarias terrestres.
Principales métodos:
- Se recogieron muestras de sangre de aves terrestres y acuáticas a lo largo de un río contaminado por mercurio en Virginia.
- Se realizó un análisis de la dieta para identificar las fuentes de mercurio.
- Los niveles de mercurio en la sangre de las aves se compararon entre especies y hábitats.
Principales resultados:
- Las aves terrestres exhibieron niveles de mercurio en la sangre comparables a las aves acuáticas.
- Las arañas fueron identificadas como una fuente significativa de mercurio en la dieta de las aves terrestres.
- Los niveles de mercurio en las aves cantoras sugieren posibles efectos adversos para la salud.
Conclusiones:
- La contaminación por mercurio acuático puede extenderse a hábitats terrestres adyacentes.
- La transferencia trófica y la biomagnificación del mercurio ocurren en los ecosistemas terrestres.
- Los invertebrados ribereños actúan como vectores de mercurio, lo que plantea riesgos para las poblaciones de aves terrestres.
Videos de Conceptos Relacionados
01:24Microbes and Other Elemental Cycles
Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
01:27The Periodic Table and Organismal Elements
Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
Periodic Table Provides Information...
Periodic Table Provides Information...
00:57The Periodic Table and Organismal Elements
Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally-occurring, and fewer still are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.The Periodic Table Provides Information about...
01:30Microbial Wastewater Treatment
Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
01:30Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
01:24Microbes and the Carbon Cycle
The carbon cycle is a fundamental Earth process involving the transfer of carbon among the biosphere, lithosphere, atmosphere, and hydrosphere. It plays a critical role in regulating the planet’s climate and supporting life by cycling carbon through various chemical forms and reservoirs. Carbon primarily circulates as carbon dioxide (CO₂), representing its oxidized form, while reduced forms such as methane (CH₄) and organic compounds also play essential roles.Microbial activity is central to...