Visual Education and Upgrade Supporting System

Yoshida, Osamu; Yoshida, Yoshinari

doi:10.5988/jime1966.33.576

Cited by 3 publications

(5 citation statements)

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“…30 °C is commonly recorded during summer in the Kagoshima and Okinawa Prefectures, southern Japan [ 11 , 26 ]. As no information was available on the optimal irradiance for S. nipponicum growth, the levels of this parameter were established based on data reported for the related species S. fusiforme , which grows at similar shallow depths [ 22 ]. In this species, the holdfast growth rate was shown to increase in response to irradiance increasing from 30 to 130 µmol photons m −2 s −1 but not under further increases in irradiance from 130 to 300 µmol photons m −2 s −1 [ 39 ].…”

Section: Methodsmentioning

confidence: 99%

“…However, such a shift has not been observed in several species, including the two fucoid algae Sargassum fusiforme (Harvey) Setchell and S. nipponicum Yendo [ 21 ]. Both of these macroalgae have filamentous holdfasts [ 22 ], from which annual shoots emerge during summer [ 10 , 23 ]. The shoots grow between autumn and spring and decay during the following summer after the production of propagules [ 10 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…S. nipponicum generally grows at shallow depths along wave-exposed coasts in the warm-temperate and subtropical waters around southern Japan [ 22 ]. This species has previously been observed along the northern coasts of Tanegashima Island, southern Japan, but has now almost disappeared [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

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Tissue-Specific Tolerance to High-Temperature and Nutrient-Poor Conditions in a Canopy-Forming Macroalga, Surviving at an Ocean Warming Hotspot

Endo,

Kodama,

Kawashima

et al. 2024

Plants

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Most canopy-forming macroalgae have disappeared from temperate reefs in southern Japan, one of the ocean warming hotspots, but Sargassum nipponicum is surviving in this region. As this species’ annual shoots emerge from holdfasts during summer, both plant components may be highly tolerant to warm and nutrient-poor conditions in this season. The present study examined the effects of temperature and nutrient conditions on holdfast growth, shoot emergence from holdfasts, and shoot growth in S. nipponicum samples collected in Tanegashima Island, southern Japan. The summer temperature in this region (30 °C) allowed holdfast growth and shoot emergence but inhibited shoot growth. Nutrient-poor conditions had limited effects on the first two parameters but suppressed shoot growth. These results suggested that during warm summers and under nutrient-poor conditions in southern Japan, shoots can emerge from S. nipponicum holdfasts but cannot further grow. Additionally, nutrient loading from a nearby river was higher at the only site dominated by S. nipponicum, than at the other sites where this species was absent on Tanegashima Island. This was observed especially between autumn and winter, implying that such a nutrient-rich environment may contribute to shoot growth in S. nipponicum and to the persistence of its population in the area.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tissue-Specific Tolerance to High-Temperature and Nutrient-Poor Conditions in a Canopy-Forming Macroalga, Surviving at an Ocean Warming Hotspot

Endo,

Kodama,

Kawashima

et al. 2024

Plants

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“…Gracilaria vermiculophylla is a red alga native to the northwest Pacific [ 7 , 9 ]. Over the past 100 years, it has successfully invaded many coastal habitats worldwide, including the eastern Pacific, western Atlantic, eastern Atlantic, and Mediterranean [ 7 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Elevated Temperature-Induced Epimicrobiome Shifts in an Invasive Seaweed Gracilaria vermiculophylla

et al. 2023

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Epibacterial communities on seaweeds are affected by several abiotic factors such as temperature and acidification. Due to global warming, surface seawater temperatures are expected to increase by 0.5–5 °C in the next century. However, how epibacterial communities associated with seaweeds will respond to global warming remains unknown. In this study, we investigated the response of epibacterial communities associated with the invasive Gracilaria vermiculophylla exposed to 3 °C above ambient temperature for 4 months using a benthocosm system in Kiel, Germany, and 16S rRNA gene amplicon sequencing. The results showed that elevated temperature affected the beta-diversity of the epibacterial communities. Some potential seaweed pathogens such as Pseudoalteromonas, Vibrio, Thalassotalea, and Acinetobacter were identified as indicator genera at the elevated temperature level. Thirteen core raw amplicon sequence variants in the elevated temperature group were the same as the populations distributed over a wide geographical range, indicating that these core ASVs may play an important role in the invasive G. vermicullophylla. Overall, this study not only contributes to a better understanding of how epibacterial communities associated with G. vermiculophylla may adapt to ocean warming, but also lays the foundation for further exploration of the interactions between G. vermiculophylla and its epimicrobiota.

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“…Porphyra kuniedae grows on rocks and other macroalgae at the upper to middle intertidal zone on the southern coast of Korea [1] and the northeastern coast of Honsu, Japan [2]. It is one of the cultivated species in Korea [3] and Japan [4].…”

Section: Introductionmentioning

confidence: 99%

Growth and Reproduction of Porphyra Kuniedae Kurogi (Bangiales, Rhodophyta) from Korea

Hwang

Kim²,

Sim³

et al. 2005

KEM

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Growth and reproduction of Porphyra kuniedae from the southern coast of Korea were investigated. Biomass, plant size and occurrence of reproductive structures were monitored every other week from November 2001 to March 2002. Release of zygotospores and monospores from the plants was induced and the number of spores was counted in the laboratory culture every month. Biomass and plant size were found to be inversely correlated with water temperature. The maximum values in biomass and plant size were observed in mid-January with the lowest water temperature, and the values decreased with the increase of water temperature. Based on the cohort analysis, three cohorts started in late November, one to two cohorts were added every other week, and the maximum was eight in mid-January. The percentage of matured plants in the field was the highest in January. In the laboratory culture test, zygotospores were released more than monospores from large plants in late December while monospores were released much more than zygotospores since late January.

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Visual Education and Upgrade Supporting System

Cited by 3 publications

References 0 publications

Tissue-Specific Tolerance to High-Temperature and Nutrient-Poor Conditions in a Canopy-Forming Macroalga, Surviving at an Ocean Warming Hotspot

Tissue-Specific Tolerance to High-Temperature and Nutrient-Poor Conditions in a Canopy-Forming Macroalga, Surviving at an Ocean Warming Hotspot

Elevated Temperature-Induced Epimicrobiome Shifts in an Invasive Seaweed Gracilaria vermiculophylla

Growth and Reproduction of Porphyra Kuniedae Kurogi (Bangiales, Rhodophyta) from Korea

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