Changes in growth, internode distance and nutrient concentrations of the seagrass Halophila ovalis with exposure to sediment sulphide

Marine Ecology Progress Series

K. L. Kilminster¹  J. A. Raven¹  P. A. Thompson¹  D. I. Walker¹ 

关键词: Sulphide;    Sediments;    Seagrass;    Nutrients;    Morphometrics;    Growth constraint;   

DOI  :  10.3354/meps07479

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: Sulphide concentrations in estuarine sediments are likely to increase with increased organic matter fluxes (eutrophication) and increased temperatures (global warming). The short-term effects of sulphide on the growth, nutrition and morphology of the seagrass Halophila ovalis (R.Br.) Hook. f. were investigated in situ. Sediments within a H. ovalis meadow were enriched with Na₂S equivalent to 0, 1.1 and 4.2 g m^–2. Sulphide diffusion tubes were estimated to increase sulphide concentrations by 1 to 4 mmol l^–1, concentrations typical of elevated sulphide measured in natural systems. Biomass, internode distance and growth rate (mg apex^–1 day^–1) were determined, and plant material was analysed for soluble carbohydrate, carbon, nitrogen and phosphorus. Sulphide exposure caused significant reduction in growth (63%), average leaf weight (30%) and internode distance (15%). Above-ground tissue phosphorus concentration and internode distance were significant predictors of growth (R² = 0.63, p < 0.01). These results demonstrate the plasticity of H. ovalis in response to a short-term sulphide pulse, and may have implications for recovery from transient sulphide stress.

【 授权许可】

Unknown