期刊
MARINE ENVIRONMENTAL RESEARCH
卷 108, 期 -, 页码 14-23出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2015.04.006
关键词
Eutrophication; Oxygen depletion; Macrozoobenthos; Trophic interaction; Stable isotopes; Succession; Sulphide
We conducted a one-year survey of macrozoobenthic community structure at 5 stations in a eutrophic canal in inner Tokyo Bay, focusing on the impacts of hypoxia, sediment H2S, and species interaction in the littoral soft-bottom habitats. Complete defaunation or decreasing density of less-tolerant taxa occurred under hypoxia during warmer months, especially at subtidal or sulfidic stations; this was followed by rapid recolonization by opportunistic polychaetes in fall-winter. Sedimentary H2S increased the mortality of macroinvertebrates under hypoxia or delayed population recovery during recolonization. The density of several polychaetes (e.g., Pseudopolydora reticulate) declined in winter, coincident with immigration of the predator Armandia lanceolate. This suggests that absence of A. lanceolate under moderate hypoxia enabled the proliferation of prey taxa. We conclude that oxygen concentration, sediment H2S, and hypoxia-induced changes in species interactions are potential drivers for spatio-temporal changes in macrozoobenthic assemblage structure in hypoxia-prone soft-bottom communities. (C) 2015 Elsevier Ltd. All rights reserved.
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