Floating period of Sargassacean thalli estimated by the change in density

Yatsuya, Kousuke

doi:10.1007/978-1-4020-9619-8_43

Cited by 9 publications

(20 citation statements)

References 5 publications

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“…Our measured fluxes of Sargassum during the decay phase (up to 6 kg fresh weight m 22 ; Table 1) is a substantial amount of primary biomass, considering that these seaweed beds cover up to 110 km 2 of the Ningaloo lagoon (Kobryn et al 2013). When detached from the substratum in autumn-winter, this Sargassum biomass can take a number of pathways that include the formation of floating rafts, deposition of wrack onto intertidal habitats, and/or sinking wrack that can disperse throughout subtidal habitats (Duarte and Cebrian 1996;Yatsuya 2009;Stimson 2013). Such transport of seaweed biomass could provide substantial spatial subsidies of primary production to other parts of the system (Duarte and Cebrian 1996;Vanderklift and Wernberg 2008;Stimson 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Such transport of seaweed biomass could provide substantial spatial subsidies of primary production to other parts of the system (Duarte and Cebrian 1996;Vanderklift and Wernberg 2008;Stimson 2013). Indeed, floating Sargassum rafts can persist for 4-14 weeks and travel considerable distances in that time (Yatsuya 2009), emphasizing the potential role that rafts could play in the transport of nutrients and primary productivity to biomes both internal and external to Ningaloo Reef.…”

Section: Discussionmentioning

confidence: 99%

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Sea temperature shapes seasonal fluctuations in seaweed biomass within the Ningaloo coral reef ecosystem

Fulton

Depczynski

Holmes

et al. 2014

Limnology & Oceanography

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Environmental drivers of seaweed biomass were investigated at Ningaloo, Western Australia, a coral reef ecosystem with negligible anthropogenic influences on seaweeds from fishing, farming, or eutrophication. Periodic surveys of benthic macroalgae occupying seaweed-dominated beds within the lagoon at two locations (Coral Bay, Tantabiddi) were made during winter, spring, and late summer over a 26 month period. Canopyforming Sargassum spp. biomass fluctuated over a seasonal growth-decay cycle, with highest values in the warm summer months (up to 1013 g fresh weight 0.25 m 22 at Coral Bay) and lowest values in winter (down to 155 g fresh weight 0.25 m 22 at Tantabiddi). Conversely, prominent understory seaweed genera Dictyopteris and Lobophora reached peak biomass in winter, when the Sargassum spp. canopy was lowest. Sargassum spp. biomass variation could be attributed largely to time (52%), location (21%), and site (26%), with low variation within individual seaweed beds (1%). Statistical analysis of the influence of five environmental variables (temperature, light, wind-driven upwelling, rainfall, significant wave height) indicated that location and sea temperature (1 month antecedent to biomass) provided the best explanation for Sargassum spp. biomass fluctuations. While sea temperature is a key driver of seaweed temporal dynamics, heterogeneity at the kilometer scale suggests that spatial context is also important. Given the important role of seaweeds in many ecosystem processes, this strong biophysical coupling between Sargassum spp. biomass and sea temperature suggests that thermal climate change will significantly affect coral reef productivity and biodiversity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Sea temperature shapes seasonal fluctuations in seaweed biomass within the Ningaloo coral reef ecosystem

Fulton

Depczynski

Holmes

et al. 2014

Limnology & Oceanography

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“…This might explain the observed decrease in ETR max during winter and the slightly lower survival of kelp rafts during that season compared to spring and fall. For Sargassum species, Yatsuya (2008) found that, with progressing reproductive stage, the floating ability of these species decreases. However, Yatsuya ' s study did not examine the influence of seasonal variations in extrinsic factors, which play an important role in the longevity of floating D. antarctica thalli.…”

Section: Influence Of Seasonal Environmental Variations On Floating Amentioning

confidence: 97%

Seasonal variation in floating persistence of detached Durvillaea antarctica (Chamisso) Hariot thalli

Graiff¹,

Karsten

Meyer³

et al. 2012

Botanica Marina

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Several large kelp species are capable of longdistance dispersal via rafting. However, seasonal changes in environmental conditions at the sea surface may variably affect the physiological status of the floating thalli; challenging conditions during summer may accelerate disintegration and cause rapid sinking. We used the bull kelp Durvillaea antarctica from northern-central Chile (30 ° S) to test seasonal variation in floating persistence. Experiments with tethered specimens were conducted in all seasons to assess how variable environmental conditions influence the morphology and photosynthetic characteristics of floating D. antarctica . Floating specimens stayed afloat at the surface for more than 1 month during moderate environmental conditions that prevailed in winter, spring, and fall. However, higher water temperatures and intense solar radiation in summer resulted in significant biomass losses and rapid disintegration of the floating kelps; consequently, they sank within < 1 month. These strong seasonal effects were reflected in decreasing maximal quantum yield as well as in maximum relative electron transport rates of photosynthesis. Understanding physiological responses of floating algae is important because increasing global temperatures and shifts in solar radiation may strongly affect the survival of floating algae, potentially reducing the distances and frequencies of rafting dispersal.

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“…The past 30 yr have seen a global increase in the occurrence of golden tides (Smetacek and Zingone ). Floating Sargassum biomass has been reported in the Sea of Japan (Yoshida ; Yatsuya ), the East China Sea (Komatsu et al a,b ; Qi et al ), the West African coast (Gower et al ), and the Sargasso Sea of the North Atlantic Ocean (Gower and King ; Hinds et al ; Sissini et al ), causing serious economic losses in fisheries and tourism, and posing a serious threat to the native biodiversity.…”

mentioning

confidence: 99%

“…S. horneri is an annual seaweed distributed in the Pacific Northwest coasts and functions as one of the important primary producers in the marine ecosystem (Hu et al ). S. horneri grows on rocky coastal bottoms and forms underwater forests or meadows in sublittoral regions, serving as nursery habitats and spawning grounds for marine invertebrates and fish (Yatsuya ). The adult S. horneri thalli contain a large number of gas‐filled vesicles which function as buoyancy aids and allow the algal thalli to stand upright from the bottom (Yoshida ).…”

mentioning

confidence: 99%

Insights on the Sargassum horneri golden tides in the Yellow Sea inferred from morphological and molecular data

Liu

Wang

et al. 2018

Limnology & Oceanography

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Large‐scale drifting Sargassum biomass, known as golden tides, has caused considerable damage to the local environment and economy associated with the Yellow Sea of China. To understand the reoccurrence of Sargassum horneri golden tides in the Yellow Sea, large‐scale spatio‐temporal sampling was performed across nine cruises and five coastal surveys. Morphological data indicated that the floating S. horneri thalli with differing reproductive timing coexisted in the Yellow Sea. A total of 196 S. horneri samples had identical sequences of partial cox3 and rbcL‐S spacer region, revealing very low genetic diversity in the floating biomass. A total of 19 haplotypes for partial cox3 previously found in the Yellow Sea were not detected in our large‐scale sampling. Based on four novel mtDNA markers, the 196 samples could be further distinguished into two forms, which varied in proportions at various locations, but coexisted in each of the spatio‐temporal sampling. These results indicated that the floating Sargassum biomass in the Yellow Sea came from only two dominating haplotypes. The novel findings uncovered by this work will provide further insight into the underlying mechanisms of reoccurring golden tides in the Yellow Sea, and lead to the improved management of the Sargassum biomass.

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Floating period of Sargassacean thalli estimated by the change in density

Cited by 9 publications

References 5 publications

Sea temperature shapes seasonal fluctuations in seaweed biomass within the Ningaloo coral reef ecosystem

Sea temperature shapes seasonal fluctuations in seaweed biomass within the Ningaloo coral reef ecosystem

Seasonal variation in floating persistence of detached Durvillaea antarctica (Chamisso) Hariot thalli

Insights on the Sargassum horneri golden tides in the Yellow Sea inferred from morphological and molecular data

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