Variation of the macrobenthic infaunal density in a bathymetric gradient: western gulf of mexico
The variability of the macrobenthic infaunal density is analyzed along a depth gradient, from the shelf break down to the abyssal plain in the western Gulf of Mexico. Samples were obtained at 10 sites in June 1997. Results show a decrease in density with increasing depth. Greatest density was record...
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| Formáid: | Online |
| Teanga: | eng |
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Iniversidad Autónoma de Baja California
1999
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| Rochtain Ar Líne: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/667 |
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oai:cienciasmarinas.com.mx:article-667 |
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Ciencias Marinas |
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eng |
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Online |
| author |
Escobar-Briones, E Signoret, M Hernández, D |
| spellingShingle |
Escobar-Briones, E Signoret, M Hernández, D Variation of the macrobenthic infaunal density in a bathymetric gradient: western gulf of mexico |
| author_facet |
Escobar-Briones, E Signoret, M Hernández, D |
| author_sort |
Escobar-Briones, E |
| title |
Variation of the macrobenthic infaunal density in a bathymetric gradient: western gulf of mexico |
| title_short |
Variation of the macrobenthic infaunal density in a bathymetric gradient: western gulf of mexico |
| title_full |
Variation of the macrobenthic infaunal density in a bathymetric gradient: western gulf of mexico |
| title_fullStr |
Variation of the macrobenthic infaunal density in a bathymetric gradient: western gulf of mexico |
| title_full_unstemmed |
Variation of the macrobenthic infaunal density in a bathymetric gradient: western gulf of mexico |
| title_sort |
variation of the macrobenthic infaunal density in a bathymetric gradient: western gulf of mexico |
| description |
The variability of the macrobenthic infaunal density is analyzed along a depth gradient, from the shelf break down to the abyssal plain in the western Gulf of Mexico. Samples were obtained at 10 sites in June 1997. Results show a decrease in density with increasing depth. Greatest density was recorded at 1230 m depth (2713.6 ± 1469.6 ind m–2), just below the minimum oxygen layer. This value is 1.5 times higher than values observed at the shelf break. Density decreases with increasing depth, attaining values three times smaller (880 ± 176.7 ind m–2) on the lower slope. The density recorded in the abyssal plain shows high variability (794.7 ± 43.7 to 1669.3 ± 536.3 ind m–2); the highest values recorded in the abyssal plain are similar to those recorded at the shelf break (1865.6 ± 1132.6 to 1932.8 ± 685.9 ind m–2). Density values recorded herein are higher than those previously published for the Gulf of Mexico and are more largely attributed to the hydrodynamics and input of organic matter than to the sediment factors. Chlorophyll a concentration in the water column is the parameter most closely related to density variability, having a similar effect as depth. The localities fall into three groups: the first includes the abyssal zone and continental rise (>3000 m), the second includes the sites located on the slope (>1500 to <3000 m) and the third includes the sites with depths less than 1500 m. The low concentration of dissolved oxygen defines the lower density on the shelf break and upper slope. Grain size and organic matter content in surficial sediment have a lesser effect on density at this depth. In contrast, the stations located on the lower slope and abyss were defined by the organic matter content in surficial sediment, which together with depth affect the macrobenthic infauna at different space scales. |
| publisher |
Iniversidad Autónoma de Baja California |
| publishDate |
1999 |
| url |
https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/667 |
| _version_ |
1715723996227436544 |
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oai:cienciasmarinas.com.mx:article-6672019-05-17T22:16:00Z Variation of the macrobenthic infaunal density in a bathymetric gradient: western gulf of mexico Variación de la densidad de la infauna macrobéntica en un gradiente batimétrico: Oeste del Golfo de México Escobar-Briones, E Signoret, M Hernández, D Gulf of Mexico macrobenthos Sigsbee density variability Golfo de México macrobentos Sigsbee densidad variabilidad The variability of the macrobenthic infaunal density is analyzed along a depth gradient, from the shelf break down to the abyssal plain in the western Gulf of Mexico. Samples were obtained at 10 sites in June 1997. Results show a decrease in density with increasing depth. Greatest density was recorded at 1230 m depth (2713.6 ± 1469.6 ind m–2), just below the minimum oxygen layer. This value is 1.5 times higher than values observed at the shelf break. Density decreases with increasing depth, attaining values three times smaller (880 ± 176.7 ind m–2) on the lower slope. The density recorded in the abyssal plain shows high variability (794.7 ± 43.7 to 1669.3 ± 536.3 ind m–2); the highest values recorded in the abyssal plain are similar to those recorded at the shelf break (1865.6 ± 1132.6 to 1932.8 ± 685.9 ind m–2). Density values recorded herein are higher than those previously published for the Gulf of Mexico and are more largely attributed to the hydrodynamics and input of organic matter than to the sediment factors. Chlorophyll a concentration in the water column is the parameter most closely related to density variability, having a similar effect as depth. The localities fall into three groups: the first includes the abyssal zone and continental rise (>3000 m), the second includes the sites located on the slope (>1500 to <3000 m) and the third includes the sites with depths less than 1500 m. The low concentration of dissolved oxygen defines the lower density on the shelf break and upper slope. Grain size and organic matter content in surficial sediment have a lesser effect on density at this depth. In contrast, the stations located on the lower slope and abyss were defined by the organic matter content in surficial sediment, which together with depth affect the macrobenthic infauna at different space scales. La variabilidad de la densidad de la infauna macrobéntica a lo largo de un gradiente batimétrico, desde el reborde continental hasta la planicie abisal, se analiza en el sector oeste del Golfo de México. Se obtuvieron muestras de 10 localidades en junio de 1997. Los resultados muestran una disminución de la densidad con el incremento de la profundidad. La densidad más elevada se registró sobre el talud continental a 1230 m (2713.6 ± 1469.6 ind m–2), justo por debajo de la capa mínima de oxígeno. Este valor de densidad es 1.5 veces más elevado que los valores observados en el reborde continental. La densidad sobre el talud continental disminuye al aumentar la profundidad y alcanza valores tres veces menores en la porción inferior del talud (880 ± 176.7 ind m–2). La densidad registrada en la planicie abisal muestra una variabilidad elevada (794.7 ± 343.7 a 1669.3 ± 536.3 ind m–2); los valores más elevados observados en la planicie abisal muestran gran similitud con los valores del reborde continental (1865.6 ± 1132.6 a 1932.8 ± 685.9 ind m–2). La densidad reconocida en este estudio es más elevada que la publicada previamente para el Golfo de México y está definida por la hidrodinámica y el aporte de materia orgánica de origen fotoautotrófico más que por los parámetros del sedimento. La concentración de clorofila a en la columna de agua es el factor que más estrechamente se relaciona con la variación de la densidad e influye en forma similar a la profundidad. Las localidades se asocian en tres grupos: el primer grupo incluye la zona abisal y elevación continental (>3000 m), el segundo grupo une las localidades ubicadas sobre el talud (>1500 a <3000 m) y el tercer grupo lo conforman las localidades menores a 1500 m. La baja concentración de oxígeno disuelto determina la densidad baja de las estaciones del reborde continental y talud superior. El tamaño de grano y el contenido de materia orgánica tienen un efecto menor sobre la densidad a esta profundidad. En contraste, las estaciones del talud continental inferior y de la zona abisal son definidas por la concentración de materia orgánica en el sedimento superficial, que junto con el efecto de la profundidad actúan a diferentes escalas espaciales sobre la infauna macrobéntica. Iniversidad Autónoma de Baja California 1999-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/667 10.7773/cm.v25i2.667 Ciencias Marinas; Vol. 25 No. 2 (1999); 193-212 Ciencias Marinas; Vol. 25 Núm. 2 (1999); 193-212 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/667/597 |
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