Sulphide intrusion in eelgrass (<i>Zostera marina</i>L.)

Pedersen, Ole; Binzer, Thomas; Borum, Jens

doi:10.1111/j.1365-3040.2004.01173.x

Cited by 219 publications

(232 citation statements)

References 37 publications

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“…The anoxia condition caused by dense macroalgae mats may change sulfide and nutrient cycles (McGlathery et al, 2007). High sulphide concentration resulting from the anoxia by macoralgae canopies in the seagrass beds can lead to sulphide intrusion into meristematic areas of seagrass, which decreases the maximum photosynthetic rate of seagrass and has an effect on leaf growth (Pedersen et al, 2004). In addition, sulfide concentrations in the pore water rise when plant photosynthesis decreases the oxygen supply to the roots (Jøgernsen, 1982).…”

Section: Indirect Effects Of Macroalgae Blooms On Sea-mentioning

confidence: 99%

Macroalgae blooms and their effects on seagrass ecosystems

Han

Chen

2014

J. Ocean Univ. China

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Seagrass decline caused by the macroalgae blooms is becoming a common phenomenon throughout temperate and tropical regions. We summarized the incidence of macroalgae blooms throughout the world and their impact on seagrass beds by direct and indirect ways. The competition for living space and using resources is the most direct effect on seagrass beds when macroalgae are blooming in an aquatic ecosystem. The consequence of macroalgae blooms (e.g., light reduction, hypoxia, and decomposition) can produce significant indirect effects on seagrass beds. Light reduction by the macroalgae can decrease the growth and recruitment of seagrasses, and decomposition of macroalgae mats can increase the anoxic and eutrophic conditions, which can further constrict the seagrass growth. Meanwhile, the presence of seagrass shoots can provide substrate for the macroalgae blooms. Controlling nutrient sources from the land to coastal waters is a general efficient way for coastal management. Researching into the synergistical effect of climate change and anthropognic nutrient loads on the interaction between searsasses and macroalgae can provide valuable information to decrease the negative effects of macroalgae blooms on seagrasses in eutrophic areas.

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Section: Indirect Effects Of Macroalgae Blooms On Sea-mentioning

confidence: 99%

Macroalgae blooms and their effects on seagrass ecosystems

Han

Chen

2014

J. Ocean Univ. China

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“…Additionally, decomposition of macroalgae mats may decrease oxygen content in eutrophicated waters and further abate seagrass survival (McGlathery et al, 2007). Furthermore, high sulfide concentration due to the anoxia from macroalgae decomposition can decrease the photosynthetic rate of seagrasses, reducing growth and even resulting in mortality (Holmer and Nielsen, 2007;Koch et al, 2007;Pedersen et al, 2004;van der Heide et al, 2012). With average temperatures rising on a global scale, blooms of green algae such as Ulva pertusa may be expected to increase (Sousa-Dias and Melo, 2008), which could in turn further increase the competitive advantage of green algae over some seagrasses (Koch et al, 2013 and references therein).…”

Section: Introductionmentioning

confidence: 99%

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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“…When exposed to the anoxic conditions, the plants must not only adapt to root anaerobiosis, but also tolerate the chemical and microbial production of phytotoxins in the sediments, such as sulfide, methane, and acetic acid (Van Wijck et al, 1992;Terrados et al, 1999). Submerged macrophytes exposed to anoxic sediments have morphological and physiological means to tolerate anoxic conditions (Pedersen et al, 2004;Borum et al, 2005). The mechanisms and degree of anoxia tolerance of submerged macrophytes are species-specific.…”

Section: Introductionmentioning

confidence: 99%

Effects of sediment anoxia and light on turion germination and early growth of Potamogeton crispus

Cheng

Liang

et al. 2009

Hydrobiologia

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Potamogeton crispus is a cosmopolitan aquatic species and is widely used as a pioneer species for vegetation restoration of eutrophic lakes. However, many restoration projects applying P. crispus turions have not been successful. Earlier studies focused on effects of light and temperature on turion germination. The purpose of this study was to determine whether sediment anoxia and light interactively affected the turion germination and early growth of P. crispus. Anoxic conditions in the experiment were produced by adding sucrose to the sediment. The germination rate of the turions was 68-73% lower in the highly anoxic condition treatment than in the control. Medium light intensity (10% of natural light at the water surface) was more favorable for germination under slightly anoxic conditions than either low or high light intensity. The growth of newly-formed sprouts was also significantly inhibited by sediment anoxia. Photosynthesis and shoot biomass were reduced under sediment anoxia, whereas total chlorophyll content, root biomass, and soluble protein content were highest in the low anoxic condition treatment. Medium light improved net photosynthesis and biomass production of the sprouts. We conclude that turion germination and sprout growth can be significantly inhibited by sediment anoxia. Medium light intensity may alleviate this inhibition by anoxia, but light has little effect when sediment anoxia is severe. For the purposes of vegetation restoration, more attention should be paid to the role of sediment anoxia, and it is necessary to improve sediment and light conditions for turion germination and early growth of P. crispus in eutrophic lakes. These results will contribute to a more complete understanding of turion germination dynamics of P. crispus and will be useful for future restoration programs.

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Sulphide intrusion in eelgrass (Zostera marinaL.)

Abstract: ABSTRACT

Cited by 219 publications

References 37 publications

Macroalgae blooms and their effects on seagrass ecosystems

Macroalgae blooms and their effects on seagrass ecosystems

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

Effects of sediment anoxia and light on turion germination and early growth of Potamogeton crispus

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