Importance of sedimentation for survival of canopy-forming fucoid algae in urchin barrens

Kawamata, Shigeru; Yoshimitsu, Satoshi; Tanaka, Toshihiro; Igari, Tadamitsu; Tokunaga, Shigemitsu

doi:10.1016/j.seares.2011.04.017

Cited by 23 publications

(34 citation statements)

References 35 publications

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“…In the Jiahe River estuary, there was no macroalgae in the sandy substrate, as sand substrate provides less anchorage for macroalgae (Quartino et al, 2001). In general, the deposition of fi ne sediment may result in insuffi cient oxygen and cause higher mortality in macroalgae recruits (Kawamata et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Temporal and spatial variations in the distribution of macroalgal communities along the Yantai coast, China

Han

Liu

2014

Chin. J. Ocean. Limnol.

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To explore the impact of environmental variables on macroalgal communities, their temporal and spatial distributions were examined along the Yantai coast, China between April 2010 and March 2011. Macroalgae sampling was conducted monthly at four sites along the coast: Jiahe River estuary, Zhifu Island, Fisherman's Wharf, and Yangma Island. The species composition and abundance, and their relationship with environmental variables were assessed. Along the Yantai coast, 35 macroalgae species were identifi ed, including 24 Rhodophyta spp., 7 Chlorophyta, and 4 Phaeophyta spp. Highest species numbers were recorded in the summer at all sampling sites, except in the Jiahe River estuary. Macroalgae biomass was the greatest in the summer. Year-round, the highest species number and dry biomass recorded at Fisherman's Wharf and Yangma Island was attributed to the substrate type. In summer, Ulva pertusa Kjellman was the dominant species identifi ed along the Yantai coast, which indicates a risk of macroalgae blooms. Our results show that seawater temperature and nutrients appear to signifi cantly affect the temporal and spatial patterns of macroalgal abundance along the Yantai coast. The effects of environmental variables on the macroalgae on the Yantai coast need further study.

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Section: Discussionmentioning

confidence: 99%

Temporal and spatial variations in the distribution of macroalgal communities along the Yantai coast, China

Han

Liu

2014

Chin. J. Ocean. Limnol.

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“…It can be deduced from dbRDA analysis that sea urchin density did not differ among the three sectors of the island studied. Despite this fact, numerous authors have suggested that wave exposure is one of the principal forces that can limit herbivore activity (Hay 1981;Lewis and Wainwright 1985;Kayamata et al 2011). Previous studies on D. africanum also lend support to this hypothesis.…”

Section: Discussionmentioning

confidence: 91%

Spatial variability, structure and composition of crustose algal communities in Diadema africanum barrens

et al. 2014

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Crustose algal communities were studied in Diadema africanum urchin barrens around Tenerife (Canary Islands, NE Atlantic). A hierarchical nested sampling design was used to study patterns of community variability at different spatial scales (sectors, three sides of the island; sites within each sector, 5-10 km apart; stations within each site, 50-100 m apart). Although noncrustose species contributed the most to community richness, cover was dominated by crustose forms, like the coralline algae Hydrolithon farinosum, H. samoënse, H. onkodes, Neogoniolithon orotavicum and N. hirtum, and the phaeophycean Pseudolithoderma adriaticum. The structure of these communities showed high spatial variability, and we found differences in the structure of urchin barrens when compared across different spatial scales. Multivariate analysis showed that variability in community structure was related to the five environmental variables studied (wave exposure, urchin density, substrate roughness, productivity and depth). Wave exposure was the variable that contributed most to community variability, followed by urchin density and substrate roughness. Productivity and depth had limited influence. The effects of these variables differed depending on the spatial scale; wave exposure and productivity were the main variables influencing community changes at the largest scale (between different sectors of the island), while D. africanum density, roughness and depth were the most influential at medium and small scales.

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“…A previous study revealed that in this area, Sargassum populations have persisted for years at relatively flat cobble beds overlaid with a thin layer of fine sediments, where sea urchins were absent or scarce (Kawamata et al 2011). However, the persistence of Sargassum populations at sediment-covered beds was puzzling, because the overlying sediment layer was thin (average thickness was mostly \2 mm but always [0.5 mm) but completely covered the rock substrata throughout the year (Kawamata et al 2011). In the area, S. duplicatum matures in June and the release of embryos occurs from late June to mid July, while S. patens matures in May and the embryo release occurs from mid May to mid June.…”

Section: Introductionmentioning

confidence: 85%

“…Kawamata (&) National Research Institute of Fisheries Engineering, Fisheries Research Agency, 7620-7 Hasaki, Kamisu City, Ibaraki 314-0408, Japan e-mail: matasan@fra.affrc.go.jp Umar et al 1998;Kawamata et al 2011). Despite such circumstantial observations, mechanisms allowing algal colonization of areas subjected to sedimentation are poorly understood.…”

Section: Introductionmentioning

confidence: 99%

“…In our study area, at a sheltered embayment of Kasasa, Minamisatsuma, Kagoshima Prefecture, Japan, the canopyforming fucoids (predominantly Sargassum duplicatum and sparsely Sargassum patens) occur only at rock reefs with fine sediments, whereas almost all rocky subtidal reefs devoid of sediments are urchin barrens (Kawamata et al 2011). A previous study revealed that in this area, Sargassum populations have persisted for years at relatively flat cobble beds overlaid with a thin layer of fine sediments, where sea urchins were absent or scarce (Kawamata et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Sediment tolerance of Sargassum algae inhabiting sediment-covered rocky reefs

et al. 2011

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Although sediment deposition has detrimental effects on macroalgal settlement and recruitment, fucoid algae (mainly Sargassum duplicatum) thrive on rocky reefs always overlaid with fine sediments in sheltered sites of Kagoshima, Japan. The aim of the present study was to assess their ability to settle and recruit onto sedimentcovered substrata. A transplant experiment using boulders with Sargassum juveniles attached showed that the 30-day survival rate was as high as 50% even for the juvenile stage (\10 mm) on boulders completely buried with sediment. In addition, an outdoor tank experiment testing the effects of different sediment thicknesses (0-4 mm) on already settled 4-day old S. duplicatum germlings indicated significant reductions in growth by the presence of sediment cover even at 0.5 mm but no significant increase in mortality up to 2 mm. Furthermore, an in situ experiment in which sterilized cobbles were placed at a sediment-covered site to allow sediment to settle over them before the embryo release showed a uniformly high recruitment of Sargassum over the cobbles. This suggests the presence of unknown mechanisms to allow the settlement of propagules on substrata thinly but completely covered by fine sediments.

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Importance of sedimentation for survival of canopy-forming fucoid algae in urchin barrens

Cited by 23 publications

References 35 publications

Temporal and spatial variations in the distribution of macroalgal communities along the Yantai coast, China

Temporal and spatial variations in the distribution of macroalgal communities along the Yantai coast, China

Spatial variability, structure and composition of crustose algal communities in Diadema africanum barrens

Sediment tolerance of Sargassum algae inhabiting sediment-covered rocky reefs

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