Effects of ulvoid (Ulva spp.) accumulation on the structure and function of eelgrass (Zostera marina L.) bed

Sugimoto, Kenji; Hiraoka, Kiyonori; Ohta, Shigeru; Niimura, Yoko; Terawaki, Toshinobu; Okada, Minoru

doi:10.1016/j.marpolbul.2007.06.008

Cited by 21 publications

(8 citation statements)

References 11 publications

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“…In highly eutrophic waters, macroalgae species can obtain the highest biomass of 0.5 kg m −2 and 0.5 m canopy height (McGlathery, 2001). In Hiroshima Bay (Japan), floating Ulva canopy height can attain 2030 cm (Sugimoto et al, 2007). Under the conditions of Cladophora vagabunda and Gracilaria tikvahiae blooms, more than 95% of light intensity is reduced from 6 to 8 cm cover (Krause-Jensen et al, 2000).…”

Section: Indirect Effects Of Macroalgae Blooms On Seagrass: Light Redmentioning

confidence: 99%

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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 Seagrass: Light Redmentioning

confidence: 99%

“…Under the conditions of Cladophora vagabunda and Gracilaria tikvahiae blooms, more than 95% of light intensity is reduced from 6 to 8 cm cover (Krause-Jensen et al, 2000). In 34 cm ulvoid canopies, over 90% of photosynthetic photon flux density is attenuated (Sugimoto et al, 2007).…”

Section: Indirect Effects Of Macroalgae Blooms On Seagrass: Light Redmentioning

confidence: 99%

Macroalgae blooms and their effects on seagrass ecosystems

Han

Chen

2014

J. Ocean Univ. China

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“…The negative effects of macroalgal blooms on seagrasses have been documented in many areas of the world, such as Australia, Japan, America and Europe (e.g. Cummins et al, 2004;Huntington and Boyer, 2008;Martínez-Lüscher and Holmer, 2010;Sugimoto et al, 2007). Small-statured seagrass species are more impacted than larger species, and the effect is often proportional to the biomass of macroalgae (Thomsen et al, 2012).…”

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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“…A negative correlation was observed in the biomass of tall Z. marina and short Ruppia maritima in the Chesapeake Bay subtidal zone (Orth 1977). Z. marina has limited light due to competition from algae (Sugimoto et al 2007). When Z. japonica of the subtidal is subjected a light limitation due to shading by leaves of Z. marina at the study site, there is little difference in the light compensation point of Z. marina and Z. japonica, the difference between the plant heights is low, and the distribution of Z. japonica by water depth in October 2011, April and June 2012 will surpass that of Z. marina.…”

Section: Discussionmentioning

confidence: 96%

Coexistence between Zostera marina and Zostera japonica in seagrass beds of the Seto Inland Sea, Japan

et al. 2017

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Background: There have been many studies on the growth conditions of Zostera marina and Zostera japonica, but few studies have examined how spatial and temporal factors affect growth in established seagrass beds or the distribution range and shoot density. This study aims to clarify the factors that determine the temporal and spatial distribution of Zostera marina and Zostera japonica in the Seto Inland Sea east of Yamaguchi Prefecture. Methods: The study site is in Hiroshima Bay of the Seto Inland Sea, along the east coast of Yamaguchi Prefecture, Japan. We monitored by diving observation to confirm shoot density, presence or absence of both species and observed water temperature, salinity by sensor in study sites. Results: The frequency of occurrence of Zostera marina was high in all seasons, even in water depths of D.L. + 1 to −5 m (80 ± 34% to 89 ± 19%; mean ± standard deviation), but lower (as low as 43 ± 34%) near the breakwall, where datum level was 1 to 2 m, and it was further reduced in datum level −5 m and deeper. The frequency of occurrence of Zostera japonica was highest in water with a datum level of +1 to 0 m. However, in datum level of 0 m or deeper, it became lower as the water depth became deeper. Datum level +1 m to 0 m was an optimal water depth for both species. The frequency of occurrence and the shoot density of both species showed no negative correlation. In 2011, the daily mean water temperature was 10°C or less on more days than in other years and the feeding damage by S. fuscescens in the study sites caused damage at the tips. Conclusions:We considered that the relationship between these species at the optimal water depth was not competitive, but due to differences in spatial distribution, Zostera marina and Zostera japonica do not influence each other due to temperature conditions and feeding damage and other environmental conditions. Zostera japonica required light intensity than Zostera marina, and the water depth played an important role in the distribution of both species.

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Effects of ulvoid (Ulva spp.) accumulation on the structure and function of eelgrass (Zostera marina L.) bed

Cited by 21 publications

References 11 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

Coexistence between Zostera marina and Zostera japonica in seagrass beds of the Seto Inland Sea, Japan

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