Title

Vulnerability of organic acid tolerant wetland biota to the effects of inorganic acidification

Document Type

Journal Article

Publisher

Elsevier BV

Faculty

Computing, Health and Science

School

Natural Sciences/Centre for Ecosystem Management

RAS ID

10622

Comments

This article was originally published as: Mccullough, C. D., & Horwitz, P. (2010). Vulnerability of organic acid tolerant wetland biota to the effects of inorganic acidification. Science of the Total Environment , 408(8), 1868-1877. Original article available here

Abstract

Inland waterbodies are often naturally acidic but are these ecosystems pre-adapted to inorganic acidification e.g., by acid sulfate soils (ASS)? We conducted a controlled mesocosm experiment with inorganically acidified wetland water and wetland sediment replicates to pH 3 from a naturally acidic (pH 3.9, conductivity=74 μS cm−1) wetland in south-western Australia. Following acidification, dissolved organic carbon and nitrogen declined, and chlorophyll a dropped to zero. Inorganic acidification mobilised metals from sediment sods with increased water concentrations of Cu, Fe, Mn, Ca, Mg and Al. Acidification showed no significant effect on diatom assemblage. Nonetheless, greatly reduced abundance and diversity of grazing zooplankton was observed. Macroinvertebrates generally showed abundance decreases, although filterer– collector taxa increased. Decreased primary production reduced functional diversity and consumer biomasses. These results suggest likely impact to ecosystem functioning of low pH, weakly-buffered and stained wetlands if exposed to inorganic acidification.

DOI

10.1016/j.scitotenv.2010.01.034

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Link to publisher version (DOI)

10.1016/j.scitotenv.2010.01.034