3 research outputs found
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In the present study a total of 88 species, which corresponds to 9 phyla, 12 classes, 30 orders, 53 families, and 73 genera, were found and listed from the rocky shores in Busan, Korea. DNA barcoding based on the primers of COI and H3 which are DNA regions has been successfully performed as well as critical analysis of the morphological characteristics. Fail-safe verification with two primers in the COI and H3 regions was successful. This result was confirmed in a phylogenetic tree with clusters being formed by species. Five species viz. Anachis miser miser, Calliostoma koma, Cantharidus japonicus, Heptacarpus rectirostris, and Vexillum emiliae have been firstly reported NCBI viz. a global genetic database, and 18 species viz. Cantharidus jessoensis, Cellana grata, Cleantiella isopus, Coscinasterias acutispina, Halosydna brevisetosa, Ischnochiton boninensis, Ischnochiton comptus, Ischnochiton hayamii, Leptodius affinis, Modiolus comptus, Monodonta confusa, Nassarius fraterculus, Onithochiton hirasei, Placiphorella stimpsoni, Rhyssoplax kurodai, Siphonaria zelandica, Tegula xanthostigma, and Tristichotrochus unicus were firstly reported to NCBI from Korean waters. In addition, occurrences of three invasive species of Ciona intestinalis, Herdmania momus, and Crepidula onyx have been confirmed with possible negative impacts on marine logistics, aquaculture, and fisheries of Busan area.
In terms of macrozoobenthos distribution, differences in community compositions have been found between the communities from Anchorage Ground and the Reference Site. This difference in community composition was further demonstrated in the MDS analysis of the BrayβCurtis similarity matrix. The Anchorage Ground is a place where a number of ships from around the world are anchoring before going in the Busan Port. Macrobenthic biodiversity in this zone was significantly higher compared to the Reference Site. These difference in community structure may be attributed to differences in site environments such as pollution status and the physical settings. The present study has contributed to the better understanding of macrozoobenthos community composition along the southern coast of Korea with providing basic data for the prospective future studies.Macrozoobenthos account for over 95% of the world's animal species. They are grouped into more than 30 phyla and make up most of the macroscopic life in the oceans. However, there are few studies on the distribution and diversity of macrozoobenthos in Busan. In May 2022, field research was conducted at 4 sites, divided into an Anchorage Ground and a Reference Site. Using COI and H3 genes, 5 species were first reported to NCBI, a global gene site, and 18 species were first reported to NCBI in Korean waters. A total of 88 species were identified. 56 Mollusca (63.6%), 12 Arthropoda (13.6%), 6 Echinodermata (6.8%), 4 Chordata (4.5%), 3 Annelida (3.4%), 3 Porifera (3.4%), 2 Platyhelminthes (2.3%), 1 Brachiopoda (1.1%), and 1 Cnidaria (1.1%). Based on cluster analysis of the Bray-Curtis similarity of macrozoobenthos, the Anchorage Ground was clearly identified as a group with a relatively higher diversity. The three invasive species found only in the Anchorage Ground in this study are Ciona intestinalis, Herdmania momus, and Crepidula onyx. This study is the first report using molecular methods to analyze the distribution, identification, and community composition of macrozoobenthos on the rocky shore of Busan, which is part of the Anchorage Ground.|λνμ μλλ¬Όμ μ μΈκ³ λλ¬Ό μ’
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μ Ciona intestinalis (μ λ Ήλ©κ²), Herdmania momus (λΆνλ©κ²) λ° Crepidula onyx (λ±λ±μ΄μ§μ κ³ λ₯) μ΄λ€. λ³Έ μ°κ΅¬λ λ¬λ°μ§μ μνλ λΆμ°μ μλ°ν΄μμ μμνλ λνμ μλλ¬Όμ λΆν¬, λμ λ° κ΅°μ§ κ΅¬μ±μ λΆμνκΈ° μν΄ λΆμμ λ°©λ²μ μ΄μ©ν μ΅μ΄μ λ³΄κ³ μ΄λ€.1. Introduction 1
2. Materials and Methods 4
2.1. Study area 4
2.2. Sample preparation 4
2.3. Morphological identification of species 9
2.4. Data analysis 9
2.5. Primer sequences 11
2.6. Target PCR mixture 11
2.7. PCR condition and sequencing 11
2.8. Phylogenetic analyses 12
3. Results 16
3.1. Diversity of macrozoobenthos 16
3.2. DNA analysis sample information 32
3.3. Phylogenetic relationships 37
3.4. Distribution and species composition of macrozoobenthos 40
3.5. Community structure 45
4. Discussion 48
4.1. Analysis of molecular identity 48
4.2. Spatial distribution of macrozoobenthos 50
4.3. Comparison with previous studies on macrozoobenthos community composition in other areas 53
4.4. Prospective invasive species 56
4.4.1. Ciona intestinalis 56
4.4.2. Herdmania momus 57
4.4.3. Crepidula onyx 57
5. Conclusion 59
References 60
Appendix 68Maste
The Mediating Role of Incompleteness and Task Avoidance/Sensation Seeking in Academic Initiation- and Completion-Procrastination
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Όμνμλ€.Procrastination is the unnecessary behavior which prohibits initiating and completing the given tasks. The aim of the present study is to examine the two subtypes of academic procrastination, academic initiation-procrastination(AIP) and academic completion- procrastination(ACP), and investigate the psychological mediating factors AIP and ACP. A series of empirical studies were conducted in order to assess (1) the possible mediating role of task avoidance/sensation seeking(TA/SS) in the relationship between impulsiveness and AIP, and (2) the mediation effect of incompleteness in the relationship between perfectionism and ACP. Also, procrastinatory behavior in the natural setting was assessed in order to examine the ecological validity of the academic initiation- and completion- procrastination model.
In study 1, 234 undergraduate students completed several surveys - the Academic Initiation- Completion Procrastination Scale(AICPS), Multi-dimensional Perfectionism Scale(MPS-F), Barratt Impulsiveness Scale(BIS), task avoidance/sensation seeking(TA/SS) and incompleteness scale - and the relationships among the variables were analyzed. The results revealed that TA/SS partially mediated the relationship between impulsiveness and AIP. Also, Incompleteness fully mediated the relationship between perfectionism and ACP.
Study 2 was designed to examine the ecological validity of the academic initiation- and completion-procrastination model by examining procrastinatory behavior in the natural setting. 40 undergraduate students reported on impulsiveness and perfectionism via survey. Moreover, they participated in challenging academic task for 4 weeks, and reported on their feelings of incompleteness, task avoidance/sensation seeking, the timings of planned initiation, actual initiation, and actual completion during the period. After the task was completed, participants subjectively reported on their academic initiation- and completion-procrastination. Correlation analysis was performed, and the results indicated that the behavioral AIP was positively correlated with TA/SS, the behavioral ACP was correlated with incompleteness. However, perfectionism was not significantly correlated with the behavioral ACP. Therefore, the self-report scale seemed to significantly assess procrastinatory behaviors in natural settings.
The findings of the current study can provide additional explanation of psychological mechanism in academic initiation- and completion-procrastination. Clinical implications and limitations of the current study and suggestions for further study were discussed.μ λ‘ 1
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Abstract 63Maste