Effects of removing Diadema on barren ground in Haidaura Bay, Mie Prefecture

Kurashima, Akira; Ishikawa, Tatsuya; Takeuchi, Daisuke; Iwao, Toyoki; Maegawa, Miyuki

doi:10.2331/suisan.80.561

Cited by 11 publications

(11 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We previously reported that Diadema-dominated barren grounds in Haidaura Bay (Mie Prefecture, central Japan) transitioned seaweed beds after removing D. setosum and Diadema sp. (Kurashima et al 2014). Algal coverage in this area increased when Diadema density decreased to 2 ind.…”

Section: Introductionmentioning

confidence: 87%

“…Recently, seaweed beds have recovered in barren ground areas as a result of removing Diadema spp. (Kurashima et al 2014). The present study was performed at the point marked study site in the inner area of Haidaura Bay (Fig.…”

Section: Study Sitementioning

confidence: 99%

“…Sea urchins play a key role in the benthic ecology of coastal ecosystems, particularly in barren grounds and coral reefs (Harrold & Reed 1985, Watanabe & Harrold 1991, Coyer et al 1993, Tegner et al 1995, Korzen et al 2011. In sea urchin-dominated barren grounds around the globe, algal coverage and biomass increase following the removal of sea urchins (McClanahan 1996, Maciá et al 2007, Kurashima et al 2014, Ling et al 2015.…”

Section: Introductionmentioning

confidence: 99%

“…However, the Pacific Diadema spp., including D. setosum, have not received as much attention. A small number of detailed studies have been carried out on the ecological effects of D. setosum (McClanahan et al 1996, Dotsu et al 2002, Muthiga & McClanahan 2013, Kurashima et al 2014. McClanahan et al (1996) reported increases in the coverage of algae and seagrass after removal of sea urchins, including D. setosum, compared to control plots.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of sea urchin (<i>Diadema setosum</i>) density on algal composition and biomass in cage experiments

Ishikawa

Maegawa

Kurashima

2016

Plankton Benthos Res

Self Cite

View full text Add to dashboard Cite

This study examines the effects of the sea urchin Diadema setosum on algal composition, coverage and biomass on barren ground. In cage experiments, the effects of D. setosum density were examined at 5 levels over the range of 0-8 ind. m −2. Algal coverage and number of species, densities and lengths of Sargassum spp. on experimental blocks in each cage were measured monthly. In the cage without D. setosum, algal coverage and biomass were higher than in cages with D. setosum. For D. setosum density of 1 ind. m −2 and higher, decreased algal coverage and decreased biomass and density of Sargassum spp. were observed. D. setosum at a density higher than 2 ind. m −2 had a negative effect on algal species numbers. Consequently, algae could grow when the D. setosum density was fewer than 2 ind. m −2. This study revealed that grazing by D. setosum has a great effect on the seaweed bed ecosystems along the coast of central Japan.

show abstract

Section: Introductionmentioning

confidence: 87%

Section: Study Sitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of sea urchin (<i>Diadema setosum</i>) density on algal composition and biomass in cage experiments

Ishikawa

Maegawa

Kurashima

2016

Plankton Benthos Res

Self Cite

View full text Add to dashboard Cite

show abstract

“…The subsidence was estimated by comparing the pre-and postearthquake water depths. The substrate types within the quadrats were classified and recorded (Kurashima et al 2014).…”

Section: Methodsmentioning

confidence: 99%

Long‐term changes in a kelp bed of Eisenia bicyclis (Kjellman) Setchell due to subsidence caused by the 2011 Great East Japan Earthquake in Shizugawa Bay, Japan

Sakanishi

Kurashima

Dazai³

et al. 2018

Phycological Research

Self Cite

View full text Add to dashboard Cite

SUMMARY We monitored an Eisenia bicyclis kelp bed during a survey of the rocky coast subtidal zone of Shizugawa Bay, the Sanriku Coast, northeastern Honshu, Japan, from 23 July 2008, to detail the biodiversity, which was subsequently directly impacted by the 2011 Great East Japan Earthquake (GEJE). To assess temporal changes in abundance of the dominant canopy forming kelp E. bicyclis and in the distribution patterns of macroalgae along a water depth gradient, percent coverage of macroalgae has been observed in permanent quadrats set near the lower limit of the Eisenia bed and in quadrats set along a water depth gradient. The GEJE, which induced huge tsunami waves and coseismic seafloor subsidence, occurred during the monitoring survey period and also affected the coastal communities in Shizugawa Bay. After the GEJE, the cover of E. bicyclis within the permanent quadrats near the lower limit of E. bicyclis gradually declined, and reached zero by July 2014. Also in the line transect survey, the offshore (deep) edge of the Eisenia bed showed a tendency to shift shoreward (upward) after the GEJE; the Eisenia bed near the pre‐earthquake offshore (deep) edge declined and finally disappeared after the GEJE. Combined with results of the permanent quadrat and line transect surveys, the post‐earthquake gradual decline and subsequent complete disappearance of the Eisenia bed within the permanent quadrats probably indicates an upward shift of the deep edge of the subsided kelp bed. Gradual change in the E. bicyclis bed over 2 years after the GEJE is a unique opportunity to document the response of a kelp bed to coseismic subsidence, demonstrating the slow and prolonged recovery process of E. bicyclis to subsidence caused by the mega‐earthquake to the pre‐earthquake depth zone.

show abstract

An update on the seaweed resources of Japan

2020

View full text Add to dashboard Cite

Natural seaweed beds, which play an important role for coastal ecosystems and marine fisheries, have been changing drastically in Japan. Interventions, such as decreasing the over-grazing by sea urchins, are being undertaken to maintain natural seaweed beds. Japan has at least 15 seaweed genera of economic importance utilized either directly as human food, as ingredients in food, or as raw materials for extraction of chemical compounds for various applications. Most species are produced through various cultivation methods that usually start in a land-based facility and are completed when seaweeds are transferred for open-sea cultivation. Cultivation, as well as harvesting, from natural populations, has sustained the Japanese seaweed industry for many years, but recently a downfall in seaweed production has been experienced in some areas for certain species due to warming oceans. Efforts to improve production have led to the development of forced cultivation techniques to reduce the cultivation period for Saccharina japonica while hybridization of different morphological forms of Undaria pinnatifida has resulted in the production of so-called “southern” and “northern types” that have desirable shapes for harvesting and processing. The future of the seaweed industry in Japan is geared towards producing high-grade products from seaweeds grown in land-based tanks using deep-ocean water.

show abstract

Effects of removing Diadema on barren ground in Haidaura Bay, Mie Prefecture

Cited by 11 publications

References 15 publications

Effect of sea urchin (<i>Diadema setosum</i>) density on algal composition and biomass in cage experiments

Effect of sea urchin (<i>Diadema setosum</i>) density on algal composition and biomass in cage experiments

Long‐term changes in a kelp bed of Eisenia bicyclis (Kjellman) Setchell due to subsidence caused by the 2011 Great East Japan Earthquake in Shizugawa Bay, Japan

An update on the seaweed resources of Japan

Contact Info

Product

Resources

About