Seasonal variations in eelgrass (Zostera marina L.) responses to nutrient enrichment and reduced light availability in experimental ecosystems

Moore, Kenneth A.; Wetzel, Richard L.

doi:10.1016/s0022-0981(99)00135-5

Cited by 141 publications

(87 citation statements)

References 51 publications

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“…The results showed that even the light-sensitive parameters are more influenced by nutrient availability than by light intensity: nutrient surplus in the sediment increased the size of leaves as has been described in numerous previous studies (Moore and Wetzel, 2000;Crossley et al, 2002;Cronin and Lodge, 2003;Va´ri et al, 2010), although in our case P. perfoliatus Table 2. Leaf number, leaf area (LA -cm 2 ), leaf width (width -cm), leaf length (length -cm), leaf dry weight (DW -mg) and internode length (internode -cm) (average ¡ SD) of P. perfoliatus at the north-eastern (NE), south-eastern (SE), north-western (NW) and south-western (SW) study sites of Lake Balaton (average ¡ SD) and the effect of nutrients (i.e., difference between the western and eastern basins) and light environment (i.e., difference between the northern and southern shores) of these parameters (t-test).…”

Section: Discussionsupporting

confidence: 76%

Impact of habitat environment onPotamogeton perfoliatusL. morphology and its within-plant variability in Lake Balaton

Tóth

Vári

2013

Ann. Limnol. - Int. J. Lim.

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-Plastic effect of environmental factors acting on an aquatic submerged plant, Potamogeton perfoliatus L. at the plant-level (nutrient availability) and the leaf-level (light intensity) at different sites in Lake Balaton was studied. Light-dependent morphological traits (foliar morphology and internode length) of P. perfoliatus were measured and analysed across the environmental gradients of the lake. The size of leaves was influenced by both trophic state and light environment: nutrient surplus increased the size of leaves by y 29%, whereas a more heterogeneous light environment resulted in 15% larger leaves. The light environment influenced shoot morphology (internode length) to a greater extent than nutrient surplus (38% vs. 19%). Contrary to this, within-plant morphological variability was significantly higher (41%) at the nutrient limiting sites as a result of diversification effect of the leaf-level environmental factor, light. Foliar parameters and within-plant variability showed correlation only with the total N content of the sediment. Appearance of P. perfoliatus is shaped by counteracting effects: within-plant differentiation, promoted by leaf-level environmental sensitivity and within-plant homogenization triggered by perception of the surroundings at plant-level. Both light attenuation, stimulating an increase of morphological variability, and nutrient surplus, initiating the stabilization of morphological parameters, could have adaptive advantages. The variability of leaf size leads to diversification of foliar parameters, thus increasing the efficiency of light harvest at low-nutrient sites and making responses to changes in the light environment more dynamic. These results suggest that leaf-level-induced diversification is counteracted by the standardization effect triggered by plantlevel environmental factors.

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Section: Discussionsupporting

confidence: 76%

Impact of habitat environment onPotamogeton perfoliatusL. morphology and its within-plant variability in Lake Balaton

Tóth

Vári

2013

Ann. Limnol. - Int. J. Lim.

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“…Light reduction caused decreased leaf, rhizome and root elongation rates, followed by diminished production. This phenomenon has been widely recorded in previous studies, independently of the nature of the screen used (Philippart 1995, Short & Burdick 1995, Longstaff & Denninson 1999, Moore & Wetzel 2000, Havens et al 2001, Nelson & Lee 2001, Ruíz & Romero 2001, Peralta et al 2002, Brun et al 2003a. Non-structural carbohydrates were mobilized, both in above-and belowground tissues, to meet carbon demands under light limitation (Alcoverro et al 1999, Ruíz & Romero 2001, Peralta et al 2002, Brun et al 2003a, with the capacity of sucrose formation and exportation restricted in aboveground tissues, and sink strength stimulated in belowground tissues, under low light (Brun et al 2003a).…”

Section: Discussionmentioning

confidence: 69%

“…Most of the studies on the effects of light reduction on seagrass survival and growth use neutral density screens to simulate such light conditions (Philippart 1995, Short et al 1995, Lee & Dunton 1997, Moore & Wetzel 2000, Peralta et al 2002. However, the major light-absorbing components (gilvin, tripton, phytoplankton and macroalgae) in the aquatic system are not optically neutral (Kirk 1983), which becomes evident under a dense blanket of ephemeral macroalgae.…”

Section: Zostera Noltii)mentioning

confidence: 99%

Effect of shading by Ulva rigida canopies on growth and carbon balance of the seagrass Zostera noltii

Brun¹,

Vergara²,

Navarro³

et al. 2003

Mar. Ecol. Prog. Ser.

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The effects of macroalgae blooms on seagrasses were assessed by shading Zostera noltii Hornem. with Ulva rigida C. Agardh mats under laboratory and field conditions. In the laboratory, where there was no direct contact between U. rigida and Z. noltii, leaf, rhizome, and root elongation rates, as well as gross production, declined as a function of U. rigida layers, causing a mobilization of non-structural carbohydrates in both above-and belowground tissues to meet carbon demands. However, when shading was performed in the field, where direct contact exists between Z. noltii and U. rigida, Z. noltii responses were not proportional to the number of Ulva layers. Elongation rates and gross production were reduced by U. rigida shading, with the lowest values under 2 Ulva layers, while there were no significant differences between controls and 4 U. rigida layers. This suggests another Ulva effect occurs besides shading. To test the likely effect of dissolved organic carbon (DOC) derived from U. rigida, Z. noltii plants were cultured under light limitation with radioactive dissolved organic carbon (DO 14 C) released by U. rigida. Plants cultured under a full DO 14 C load showed a significant enhancement of growth. The DO 14 C disappeared from the culture medium during the first 4 d of culture as a linear function of external DO 14 C concentration. This was coupled to a linear increase of radioactive particulate organic carbon (PO 14 C) in aboveground tissues, while a substantial part of this PO 14 C was allocated in belowground tissues. Overall, the PO 14 C incorporated in Z. noltii plants represented ca. 20 to 25% of the DO 14 C which had disappeared. Therefore, a net transfer of DO 14 C from U. rigida to Z. noltii has been documented. Other additional possibilities, such as a light quality effect or other kind of signals (i.e. growth factors), are discussed.KEY WORDS: Eutrophication · Heterotrophic DOC uptake · Dissolved organic carbon · Seagrass · Non-structural carbohydrates · Light reduction Resale or republication not permitted without written consent of the publisher

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“…In both models, seagrass/SAV had an overwhelmingly positive response to the nutrient reduction scenario, which is a well-documented effect in other eutrophic estuaries (McGlathery, Sundback, and Anderson, 2007;Moore, Neckles, and Orth, 1996;Moore and Wetzel, 2000). In the FCM model, stakeholders indicated that seagrass is adversely affected by increases in phytoplankton, which is driven by increased nutrients (Figure 2).…”

Section: Discussionmentioning

confidence: 81%

Quantitative vs. Semiquantitative Ecosystem Models: Comparing Alternate Representations of an Estuarine Ecosystem

Vasslides

Jensen

2017

Journal of Coastal Research

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Seasonal variations in eelgrass (Zostera marina L.) responses to nutrient enrichment and reduced light availability in experimental ecosystems

Cited by 141 publications

References 51 publications

Impact of habitat environment onPotamogeton perfoliatusL. morphology and its within-plant variability in Lake Balaton

Impact of habitat environment onPotamogeton perfoliatusL. morphology and its within-plant variability in Lake Balaton

Effect of shading by Ulva rigida canopies on growth and carbon balance of the seagrass Zostera noltii

Quantitative vs. Semiquantitative Ecosystem Models: Comparing Alternate Representations of an Estuarine Ecosystem

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