Analysis of the Economic Effects of Jeju Regional by Hosting the International Seaweed Symposium

Baek, Lee Joon; Kang, Su-Min; Cheol, Kim Min

doi:10.24907/jtir.2020.2.40.1.39

Cited by 3 publications

(3 citation statements)

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“…Therefore, morphology based species identification in the genus Ulva often involves taxonomic errors due to intraspecific variation [4–7]. In Korea, previous taxonomic classifications for Ulva have mostly consisted of morphological investigations, therefore the reported number of species might be over- or under-estimated [2, 3, 8, 9]. Relatively little attention has been paid to molecular-based ecological surveys for species identification of the genus Ulva from this country [but see 4, 10].…”

Section: Introductionmentioning

confidence: 99%

Species composition, diversity, and distribution of the genus Ulva along the coast of Jeju Island, Korea based on molecular phylogenetic analysis

et al. 2019

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Species diversity in the genus Ulva remains understudied worldwide. Using molecular analyses we investigated the species composition, diversity, distribution, and relative frequencies of the genus Ulva along the entire coast of Jeju Island, off the southern tip of Korea. Species identification was performed for 215 samples collected from 23 sites, based on comprehensive phylogenetic and model-based species delimitation analyses using the sequences of two molecular markers, chloroplast elongation factor Tu ( tuf A) and nuclear rDNA internal transcribed spacer (ITS). We identified 193 specimens as nine Ulva species, 14 specimens as Blidingia spp., and eight samples undetermined, based on the combined analysis of tuf A and ITS phylogenies. Two model-based approaches generally supported nine groups of Ulva species. Previously documented species complex, such as U . ohnoi−U . spinulosa and U . procera−U . linza showed discordant relationships between the two phylogenies. The occurrence of U . torta on Jeju Island was first observed, despite its existence on the mainland previously reported. Ulva australis [16 of 23 sites; 34.4% (relative frequency)], U . ohnoi (16; 21.9%), and U . procera (11; 14%) were found to be the predominant species. Our study highlights that molecular analysis is critical for species delimitation in the genus Ulva and provides fundamental information for an understanding of green-tide assemblages on the “biological hotspot” coastal ecosystem, Jeju Island in Korea. This study will also help to monitor and manage local green tides at the areas that are currently encountering rapid climate changes.

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Section: Introductionmentioning

confidence: 99%

Species composition, diversity, and distribution of the genus Ulva along the coast of Jeju Island, Korea based on molecular phylogenetic analysis

et al. 2019

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“…Lanfrancok et al [51] found that estrogen increased significantly in both male and female elderly in a study conducted with resistance exercise for the elderly, whereas [52] showed that estradiol decreased after completing 12 weeks of a complex exercise program. In addition, with the application of a 12-week circular exercise program [53], an elastic resistance exercise program using a rip trainer [54], and an aerobic exercise program [55], it is reported that there is a positive improvement effect by increasing E2.…”

Section: Discussionmentioning

confidence: 99%

The Effect of 6-Month Complex Exercise on Serum Bone Metabolism: Focused on the Elderly over 75 Years Old

et al. 2022

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Korea already entered the aging society (August 2017), in which 14% of the population is 65 years or older, and it is expected to enter as a super-aged society, in which 20% of the population is elderly at the world’s fastest rate by 2025. This means that a health management plan is needed to effectively manage the health of the elderly in preparation for the upcoming super-aging society. Therefore, this study analyzed the effects of exercise on serum osteocalcin, bone ALP, and estradiol, which are representative indicators of bone formation after six months of complex exercise, and confirmed the usefulness of exercise programs and biochemical indicators for the elderly in late years to provide basic data for the prevention of osteoporosis. The subjects of this study were the elderly in late years (exercise group = 14, control group = 15), those 75 years or older in Korea, who performed complex exercises twice a week for six months. As a result of analyzing the effect of exercise performance on osteocalcin in the elderly in late years for six months in this study, no significant difference was found. However, osteocalcin decreased by 7.7% in the control group and increased by 18.66% in the exercise group, while ALP increased by 18.92% in the control group and significantly increased by 69.81% in the exercise group. As a result of analyzing the effect on estradiol, there was no significant difference, but it decreased by 55.09% in the control group and decreased by 1.85% in the exercise group. Based on the results showing that exercise clearly plays a positive role in improving bone density even for middle- and late-aged elderly people, in the future, the exercise will be useful to maintain and improve health related to the skeleton of the elderly through the combined participation of aerobic, resistance, and balance exercises. In addition, it is necessary to conduct repeated studies targeting the elderly of various age groups to evaluate the effects of exercise according to period and gender.

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“…After deglaciation, the equator appears to have acted as a geographic barrier since high temperatures are not favorable for the growth of Ahnfeltia ( Lüning and Freshwater, 1988 ; Mansilla et al, 2014 ). Ahnfeltia fastigiata is distributed along the coasts of the Northeast (NE) and Northwest (NW) Pacific ( Lee and Kang, 2001 ; Milstein and Saunders, 2012 ). In East Asia, several places appear to be macroalgal refugia, isolated due to tectonic events and changes in current circulation patterns after glacial periods ( Yang et al, 2009 ; Hu et al, 2011 ; Boo et al, 2019 ; Yang et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Organelle Genome Variation in the Red Algal Genus Ahnfeltia (Florideophyceae)

et al. 2021

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The agarophyte Ahnfeltia (Ahnfeltiales, Rhodophyta) is a globally widespread genus with 11 accepted species names. Two of the most widespread species in this genus, A. plicata and A. fastigiata, may have diverged genetically due to past geographic changes and subsequent geographic isolation. To investigate this genomic and genetic diversity, we generated new plastid (ptDNAs) and mitochondrial genomes (mtDNAs) of these Ahnfeltia species from four different regions (A. plicata - Chile and UK and A. fastigiata - Korea and Oregon). Two architecture variations were found in the Ahnfeltia genomes: in ptDNA of A. fastigiata Oregon, the hypothetical pseudogene region was translocated, likely due to recombination with palindromic repeats or a gene transfer from a red algal plasmid. In mtDNA of A. fastigiata Korea, the composition of the group II intronic ORFs was distinct from others suggesting different scenarios of gain and loss of group II intronic ORFs. These features resulted in genome size differences between the two species. Overall gene contents of organelle genomes of Ahnfeltia were conserved. Phylogenetic analysis using concatenated genes from ptDNAs and mtDNAs supported the monophyly of the Ahnfeltiophycidae. The most probable individual gene trees showed that the Ahnfeltia populations were genetically diversified. These trees, the cox1 haplotype network, and a dN/dS analysis all supported the theory that these Ahnfeltia populations have diversified genetically in accordance with geographic distribution.

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Analysis of the Economic Effects of Jeju Regional by Hosting the International Seaweed Symposium

Cited by 3 publications

References 0 publications

Species composition, diversity, and distribution of the genus Ulva along the coast of Jeju Island, Korea based on molecular phylogenetic analysis

Species composition, diversity, and distribution of the genus Ulva along the coast of Jeju Island, Korea based on molecular phylogenetic analysis

The Effect of 6-Month Complex Exercise on Serum Bone Metabolism: Focused on the Elderly over 75 Years Old

Organelle Genome Variation in the Red Algal Genus Ahnfeltia (Florideophyceae)

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