Characterization of suspended particles in Everglades wetlands

Limnology and Oceanography
By: , and 

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Abstract

We report the concentration, phosphorus (P) and nitrogen (N) content, and size and chemical fractionation of fine suspended particles (0.2‐100 µm) and colloids (3 kilodalton [kDa]‐0.1 µm) in the surface water of Everglades wetlands along regional and P‐enrichment gradients. Total suspended sediment concentrations ranged from 0.7 to 2.7 mg L−1. Total particulate P concentrations increased from 0.05 µmol L21 to 0.31 µmol L−1along the Penrichment gradient. Particles contained from 20% to 43% of total P but <12% of total N in surface water. Dissolved (<0.2 µm) organic N contained about 90% of total N, with the 3‐100‐kDa colloidal size class containing the most N of any size class. The 0.45‐2.7‐µm size fraction held the most particulate P at all sites, whereas particulate N was most abundant in the 2.7‐10‐µm size class at most sites. Standard chemical fractionation of particles identified acid‐hydrolyzable P as the most abundant species of particulate P, with little reactive or refractory organic P. Sequential chemical extraction revealed that about 65% of total particulate P was microbial, while about 25% was associated with humic and fulvic organic matter. The size and chemical fractionation information suggested that P‐rich particles mostly consisted of suspended bacteria. Suspended particles in Everglades wetlands were small in size and had low concentrations, yet they stored a large proportion of surface‐water P in intermediately reactive forms, but they held little N.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Characterization of suspended particles in Everglades wetlands
Series title Limnology and Oceanography
DOI 10.4319/lo.2007.52.3.1166
Volume 52
Issue 3
Year Published 2007
Language English
Contributing office(s) Toxic Substances Hydrology Program
Description 13 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Limnology and Oceanography
First page 1166
Last page 1178
Country United States
State Florida
Other Geospatial Everglades wetlands