Human impacts on large benthic foraminifers near a densely populated area of Majuro Atoll, Marshall Islands.
Mar Pollut Bull
; 60(8): 1279-87, 2010 Aug.
Article
en En
| MEDLINE
| ID: mdl-20399474
Human impacts on sand-producing, large benthic foraminifers were investigated on ocean reef flats at the northeast Majuro Atoll, Marshall Islands, along a human population gradient. The densities of dominant foraminifers Calcarina and Amphistegina declined with distance from densely populated islands. Macrophyte composition on ocean reef flats differed between locations near sparsely or densely populated islands. Nutrient concentrations in reef-flat seawater and groundwater were high near or on densely populated islands. delta(15)N values in macroalgal tissues indicated that macroalgae in nearshore lagoons assimilate wastewater-derived nitrogen, whereas those on nearshore ocean reef flats assimilate nitrogen from other sources. These results suggest that increases in the human population result in high nutrient loading in groundwater and possibly into nearshore waters. High nutrient inputs into ambient seawater may have both direct and indirect negative effects on sand-producing foraminifers through habitat changes and/or the collapse of algal symbiosis.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Contaminantes del Agua
/
Monitoreo del Ambiente
/
Foraminíferos
Límite:
Humans
Idioma:
En
Revista:
Mar Pollut Bull
Año:
2010
Tipo del documento:
Article
País de afiliación:
Japón
Pais de publicación:
Reino Unido