کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5766016 1627446 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Short communicationN2 production and fixation in deep-tier burrows of Squilla empusa in muddy sediments of Great Peconic Bay
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
پیش نمایش صفحه اول مقاله
Short communicationN2 production and fixation in deep-tier burrows of Squilla empusa in muddy sediments of Great Peconic Bay
چکیده انگلیسی


- Measurements of N2 fixation & N2 production in Squilla empusa burrows
- Field data suggest N2 production dominates N2 fixation.
- N2 fixation in burrows of Squilla not a likely source to balance marine N budgets.

Global marine N budgets often show deficits due to dominance of benthic N2 production relative to pelagic N2 fixation. Recent studies have argued that benthic N2 fixation in shallow water environments has been underestimated. In particular, N2 fixation associated with animal burrows may be significant as indicated by high rates of N2 fixation reported in muddy sands populated by the ghost shrimp, Neotrypaea californiensis (Bertics et al., 2010). We investigated whether N2 fixation occurs at higher rates in the burrow-walls of the deep-burrowing (~ 0.5-4 m) mantis shrimp, Squilla empusa, compared to ambient, estuarine muds and measured seasonal in-situ N2 concentrations in burrow-water relative to bottom-water. Acetylene reduction assays showed lower N2 fixation in burrow-walls than in un-populated sediments, likely due to inhibitory effects of O2 on ethylene production. Dissolved N2 was higher in burrow-water than proximate bottom-water at all seasons, demonstrating a consistent balance of net N2 production relative to fixation in deep-tier biogenic structures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sea Research - Volume 129, November 2017, Pages 36-41
نویسندگان
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