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Effects of macroalgal blooms on carbon and nitrogen biogeochemical cycling in photoautotrophic sediments: an experimental mesocosm.

Abstract：

:The effects of floating macroalgae (250 g DW m(-2)) on photoautotrophic microbenthos were studied in a flow-through mesocosm with a parallel mesocosm without macroalgae serving as Control. Vertical microprofiles of O(2) at the sediment-water interface showed a immediate and complete suppression of photosynthetic activity of microphytobenthos (MPB) under the macroalgal canopy, resulting in a shift of benthic metabolism from autotrophic to heterotrophic. MPB abundance and chlorophyll a content decreased and a change from a diatom-dominated to cyanobacteria-dominated community was observed. Inorganic nitrogen nutrients' concentrations increased in the porewater as a result of the inhibition of MPB nutrient demand, leading to an increase in net ammonification and anaerobic NO(x)(-) consumption rates. No organic matter transfer from macroalgae to the sediment was detected, resulting in a net consumption of the carbon and nitrogen stored in the sediment. In consequence, sediment was progressively impoverished in nitrogen, reducing sediment nutrient regeneration.

journal_name

Mar Pollut Bull

journal_title

Marine pollution bulletin

authors

García-Robledo E,Corzo A

doi

10.1016/j.marpolbul.2011.03.044

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

1550-6

issue

7

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(11)00187-1

journal_volume

62

pub_type

杂志文章

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