Morphometric variations as acclimation mechanisms in Zostera noltii beds

Peralta, Gloria; Brun, Fernando G.; Hernández, Ignacio; Vergara, Juan J.; Pérez‐Lloréns, José Lucas

doi:10.1016/j.ecss.2005.02.027

Cited by 87 publications

(85 citation statements)

References 43 publications

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“…Morphometric changes of seagrasses can be used as an indicator of changes in the environmental variables as well (Peralta et al, 2005). In our study, leaf length of Z. marina tended to increase with U. pertusa addition, which might indicate shading stress.…”

Section: Slow Indicator Responses Of Seagrassesmentioning

confidence: 52%

Combined nutrient and macroalgae loads lead to response in seagrass indicator properties

Han

Soissons

Bouma

et al. 2016

Marine Pollution Bulletin

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a b s t r a c t a r t i c l e i n f oExcess nutrients are potential factors that drive phase shifts from seagrasses to macroalgae. We carried out a manipulative field experiment to study the effects of macroalgae Ulva pertusa loading and nutrient addition to the water column on the nitrogen (N) and carbon (C) contents (i.e., fast indicators) as well as on the morphology and structure (i.e., slow indicators) of Zostera marina. Our results showed rapid impact of increased macroalgae and nutrient load on Z. marina C/N ratios. Also, macroalgae addition resulted in a trend of decreasing belowground biomass of seagrasses, and nutrient load significantly decreased above to belowground biomass ratio. Although some morphological/structural variables showed relatively fast responses, the effects of short-term disturbance by macroalgae and nutrients were less often significant than on physiological variables. Monitoring of seagrass physiological indicators may allow for early detection of eutrophication, which may initiate timely management interventions to avert seagrass loss.

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Section: Slow Indicator Responses Of Seagrassesmentioning

confidence: 52%

Combined nutrient and macroalgae loads lead to response in seagrass indicator properties

Han

Soissons

Bouma

et al. 2016

Marine Pollution Bulletin

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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%

“…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). Zostera noltii Hornemann produced small narrow leaves with long internodes in response to increased hydrodynamic flow following the creation of an artificial inlet (Peralta et al 2005). A study of Z. tasmanica den Hartog across an environmental gradient of increased turbidity, increased water column chl a and decreased light showed reduced leaf numbers per shoot, leaf weight per shoot, shoot length and internode distance, while overall seagrass cover and shoot density also decreased (Miller et al 2005).…”

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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“…Specimens of Zostera noltii were collected from an intertidal sandy meadow at Santibañez (Cadiz Bay Natural Park,36°32 0 N, 6°15 0 W) in spring 2004 during the onset of its maximum growth phase (Brun et al, 2003a;Peralta et al, 2005). Plants were gathered carefully to keep below-ground parts intact and transported to the laboratory in an ice-chest.…”

Section: Sampling Sitementioning

confidence: 99%

Interactions of light and organic matter under contrasting resource simulated environments: the importance of clonal traits in the seagrass Zostera noltii

et al. 2009

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Light reduction in the water column and enhanced organic matter (OM) load into the sediments are two main consequences of eutrophication in marine coastal areas. This study addresses the combined effects of light, OM, and clonal traits in the seagrass Zostera noltii. Large Z. noltii plants were grown in sand with or without the addition of OM and under two light levels (high light and low light). Whereas some complete plant replicates were grown under homogeneous light and/or OM conditions, other replicates were grown under contrasting light and/or OM levels between the apical and the distal parts of the same plant. The three-way factorial design (light, OM load, and apex position) allowed us to determine the harmful effect of light reduction and OM enrichment on the growth, photosynthetic performance, and biochemical composition of Z. noltii. The addition of OM to the sediment promoted a decrease, or even an inhibition, in net plant growth regardless of the light level when the whole plants were grown under homogeneous light conditions. However, the results differed when plants were grown under contrasting light and/or OM conditions between apical and distal parts. In this case, the harmful effect of OM load was alleviated when apical parts were grown under high light conditions. OM loads also negatively affected the photosynthetic performance, evaluated as leaf fluorescence. The results indicate the importance of clonal traits in the response of Z. noltii growth to light conditions and OM enrichment.

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Morphometric variations as acclimation mechanisms in Zostera noltii beds

Cited by 87 publications

References 43 publications

Combined nutrient and macroalgae loads lead to response in seagrass indicator properties

Combined nutrient and macroalgae loads lead to response in seagrass indicator properties

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

Interactions of light and organic matter under contrasting resource simulated environments: the importance of clonal traits in the seagrass Zostera noltii

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