The influence of freshwater runoff on biomass, morphometrics, and production of Thalassia testudinum

Irlandi, E. A.; Orlando, B. A.; Maciá, Silvia; Biber, Patrick D.; Jones, Tahzay; Kaufman, Louis; Lirman, Diego; Patterson, El Tanya

doi:10.1016/s0304-3770(01)00217-0

Cited by 27 publications

(11 citation statements)

References 14 publications

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“…Recent studies on other seagrass species have linked variation in morphology to environmental gradients (Irlandi et al 2002, Miller et al 2005, Peralta et al 2005. Thalassia testudinum exposed to increased freshwater runoff (decreased salinity, increased turbidity and decreased light) showed reduced biomass, shoot weight, areal production and leaf width (Irlandi et al 2002).…”

Section: Discussionmentioning

confidence: 99%

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

Kilminster¹,

Walker²,

Thompson³

et al. 2008

Mar. Ecol. Prog. Ser.

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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 Na 2 S 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 (R 2 = 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.

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Section: Discussionmentioning

confidence: 99%

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

Kilminster¹,

Walker²,

Thompson³

et al. 2008

Mar. Ecol. Prog. Ser.

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“…Wastewaters [146,152,153] Oil/dispersants/drilling fluids [89][90][91][92]96] Wasting disease [154] Shellfish harvesting (scallops, clams) [155][156][157][158] Nutrient enrichment [28,159] Global climate change [31,160] Prop and mooring scarring [161][162][163] Crab dredging/trawling [164] Freshwater runoff/salinity [30,[165][166][167] Housing development [168] Alga proliferation [169] Contaminated sediment [135,170] Fish farming [171][172][173] Marina development [174,175] Animal grazing [13] Dock structures [176] Radionucleotides [177] Invasive species [178][179][180] Groundwater [181] Submarine springs [182] Dredging [183,184] Lobster traps [185] Impounded mangrove forest [186] Harmful algal b...…”

Section: Drivers or Stressor Referencementioning

confidence: 99%

Nonnutrient anthropogenic chemicals in seagrass ecosystems: Fate and effects

Lewis

Devereux

2009

Enviro Toxic and Chemistry

119

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Abstract-Impacts of human-related chemicals, either alone or in combination with other stressors, are important to understand to prevent and reverse continuing worldwide seagrass declines. This review summarizes reported concentrations of anthropogenic chemicals in grass bed-associated surface waters, sediments, and plant tissues and phytotoxic concentrations. Fate information in seagrass-rooted sediments and overlying water is most available for trace metals. Toxicity results in aqueous exposures are available for at least 13 species and a variety of trace metals, pesticides, and petrochemicals. In contrast, results for chemical mixtures and chemicals in sediment matrices are uncommon. Contaminant bioaccumulation information is available for at least 23 species. The effects of plant age, tissue type, and time of collection have been commonly reported but not biological significance of the chemical residues. Experimental conditions have varied considerably in seagrass contaminant research and interspecific differences in chemical residues and chemical tolerances are common, which limits generalizations and extrapolations among species and chemicals. The few reported risk assessments have been usually local and limited to a few single chemicals and species representative of the south Australian and Mediterranean floras. Media-specific information describing exposure concentrations, toxic effect levels, and critical body burdens of common near-shore contaminants is needed for most species to support integrated risk assessments at multiple geographical scales and to evaluate the ability of numerical effects-based criteria to protect these marine angiosperms at risk.

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“…Studies have been conducted more commonly to determine seagrass distribution (Iverson and Bittaker, 1986;Hall et al, 1999;Zieman et al, 1999;Fourqurean et al, 2002), biomass and productivity (Dawes et al, 1985;Tomasko and Hall, 1999;Bologna and Haywick, 2002), environmental controlling factors (Livingston et al, 1998;Fletcher and Fletcher, 1995;Erskine and Koch, 2000;Koch and Erskine, 2001;Irlandi et al, 2002), and the diversity of seagrass-dependent flora and fauna (Hall and Bell, 1993;Frankovich and Zieman, 1994;Matheson et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Florida seagrass habitat evaluation: A comparative survey for chemical quality

Lewis

Dantin

Chancy

et al. 2007

Environmental Pollution

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Some anthropogenic contaminants were prevalent in seagrass and their rooted sediments but the biological significance is unknown. AbstractContaminant concentrations were determined for media associated with 13 Florida seagrass beds. Concentrations of 10 trace metals were more commonly detected in surface water, sediment and two seagrass species than PAHs, pesticides and PCBs. Concentrations of copper and arsenic in surface water exceeded Florida aquatic life criteria more frequently than other trace elements. Total organic carbon, mercury, chromium, zinc, total chlordane, total PAHs, total PCBs, DDD and DDE were significantly greater in seagrass-rooted sediments than adjacent non-vegetated sediments. Total DDT, DDD, DDE, total chlordane, arsenic, copper and nickel exceeded proposed sediment quality guidelines at six of 13 grass beds. Pesticides, PAHs, and PCBs were below detection in seagrass tissues. Mercury, cadmium, nickel, lead and silver were detected in 50% or more of the tissues for Thalassia testudinum (turtle grass) and Halodule wrightii (shoal grass). Spatial, interspecific and tissue differences were usually an order of magnitude or less.

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The influence of freshwater runoff on biomass, morphometrics, and production of Thalassia testudinum

Cited by 27 publications

References 14 publications

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

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

Nonnutrient anthropogenic chemicals in seagrass ecosystems: Fate and effects

Florida seagrass habitat evaluation: A comparative survey for chemical quality

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