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• W1988818452 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 263:139-147 (2003) - doi:10.3354/meps263139 Dynamic response of a mud snail Nassarius sinusigerus to changes in sediment biogeochemistry N. Eden, T. Katz, D. L. Angel* Israel Oceanographic and Limnological Research, National Center for Mariculture, PO Box 1212, Eilat 88112, Israel *Corresponding author. Email: dror@mit.edu ABSTRACT: It has been widely documented that point sources of organic enrichment elicit abundance peaks in the distribution of benthic opportunistic species. However, the temporal dimension of such phenomena has not been examined. In this study, we explored the dynamic relationship between the seasonal distribution pattern of the mud snail Nassarius sinusigerus and the geochemical conditions of the sediment along an organic enrichment gradient adjacent to a commercial fish farm. Cluster analysis of total dissolved sulfides (TDS), dissolved oxygen (DO) and organic matter (OM) revealed 3 distinct groups: Œhighly¹, Œmoderately¹ and Œslightly¹ impacted sediments. The seasonal distribution of N. sinusigerus along a transect away from the fish farm indicated that a peak in snail abundance was associated with the moderately impacted sediments, occurred between 20 and 80 m from the center of the farm, and corresponded to [DO] > 0.3 ppm and [hydrogen sulfide] < 1 µM. When the sediment conditions near the farm deteriorated during summer, the peak in snail abundance shifted away from the farm. An improvement in sediment conditions during the following winter enabled the migration of N. sinusigerus toward the farm. The factor drawing N. sinusigerus toward the farm was probably food availability, as suggested by the strong attraction of the snails to the sediments and to annelids below the fish cages. This study suggests that the distribution of N. sinusigerus around fish farms is determined by the balance between the attraction of the gastropod to the organically enriched sediments below the fish cages and deterrence due to deleterious sediment geochemistry (mainly anoxia and sulfides). As such, the distribution of N. sinusigerus may serve as an indicator of sediment conditions. KEY WORDS: Aquaculture · Macrobenthos · Gastropods · Organic matter · Hydrogen sulfide · Hypoxia · Red Sea Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 263. Online publication date: November 28, 2003 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2003 Inter-Research." @default.
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• W1988818452 title "Dynamic response of a mud snail Nassarius sinusigerus to changes in sediment biogeochemistry" @default.
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