Effect of anoxia on the vertical migration of benthic foraminifera

Autor:	I. A. P. Duijnstee, G.J. van der Zwaan, S. R. Ernst
Rok vydání:	2003
Předmět:	Ecology biology Environmental factor Aquatic Science biology.organism_classification medicine.disease_cause Anoxic waters Foraminifera Oceanography Mediterranean sea Habitat Benthic zone medicine Microcosm Diel vertical migration Ecology Evolution Behavior and Systematics
Zdroj:	Marine Ecology Progress Series. 246:85-94
ISSN:	1616-1599 0171-8630
DOI:	10.3354/meps246085
Popis:	We present the results of a microcosm experiment in which benthic foraminifera had to re-establish microhabitat distributions under simulated anoxic and oxygenated bottom-water condi- tions after initial homogenization of the sediment (obtained from the northern Adriatic Sea at 32 m water depth). After 3 wk, the vertical distribution of the 12 most abundant species was assessed. These taxa could be divided into 2 distinct groups: (1) typical shallow-living species with maximum abundances in the top 2 cm of the sediment; and (2) deeper-dwelling taxa that were more homo- geneously distributed throughout the sediment column. Compared to the oxygenated environment, the average living depth of all species was less under anoxic bottom-water conditions in which the group of shallow dwellers was almost restricted to the top 5 mm of the sediment. This distribution was most probably caused by negative geotaxis, induced by an external stimulus associated with anoxic conditions (e.g. high (H2S)). The deeper-living taxa apparently lack the ability for negative geotaxis or are less sensitive to the stimulus.
Databáze:	OpenAIRE
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