Hanoi is the second-largest city in Vietnam, with rapid urbanization, high population density and continuously increasing people's income. However, due to climate change and urbanization, heat stress is becoming more and more serious, affecting public health. This study used the method of calculating effective temperature (ET) to evaluate the spatial and temporal variation of heat stress in Hanoi city from the period 1961 to 2020. Calculation results of the ET value showed that the ET at the hot and fairly hot level was mainly concentrated in June, July, and August. ET tends to increase markedly over time. During the period 1961 - 1997, there was almost no hot ET, but from 1998 to the present, the number of hot ET months occurs frequently in June and July. The number of hot months in the downtown area of Hanoi is much higher than in the surrounding areas. With such a trend in the future, the months of June and July will always have hot ET. The research results are useful documents for management agencies and the health sector to take specific actions to strengthen the health care system, develop infrastructure, and inform the community about the risk of heat stress.
{"title":"Assessment of heat stress change in Hanoi city","authors":"Hung Dao Ngoc, Thuy Hoang Luu Thu, Thao Dang Bich, Thao Tran Thi","doi":"10.18173/2354-1059.2022-0013","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0013","url":null,"abstract":"Hanoi is the second-largest city in Vietnam, with rapid urbanization, high population density and continuously increasing people's income. However, due to climate change and urbanization, heat stress is becoming more and more serious, affecting public health. This study used the method of calculating effective temperature (ET) to evaluate the spatial and temporal variation of heat stress in Hanoi city from the period 1961 to 2020. Calculation results of the ET value showed that the ET at the hot and fairly hot level was mainly concentrated in June, July, and August. ET tends to increase markedly over time. During the period 1961 - 1997, there was almost no hot ET, but from 1998 to the present, the number of hot ET months occurs frequently in June and July. The number of hot months in the downtown area of Hanoi is much higher than in the surrounding areas. With such a trend in the future, the months of June and July will always have hot ET. The research results are useful documents for management agencies and the health sector to take specific actions to strengthen the health care system, develop infrastructure, and inform the community about the risk of heat stress.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83581345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-01DOI: 10.18173/2354-1059.2022-0016
Oanh Hoang Thi Kieu, Loi Le Huu
The climate conditions for tourism development by using the HCI - Holiday Climate Index developed by Mantao Tang (2013). HCI index assesses the impact of climate through 4 elements of climate: thermal comfort index; average rainfall; cloud cover and average wind speed. The result shows that Ba Ria - Vung Tau province has the most favorable level of climate for tourism development. Moreover, the monthly HCI index shows that the most suitable period for tourist activities every year usually appears from December to February of the following year with favorable levels from Good to Very Good.
{"title":"Using Holiday Climate Index to assess the favorable climate for tourism development in some locals of Southern Vietnam","authors":"Oanh Hoang Thi Kieu, Loi Le Huu","doi":"10.18173/2354-1059.2022-0016","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0016","url":null,"abstract":"The climate conditions for tourism development by using the HCI - Holiday Climate Index developed by Mantao Tang (2013). HCI index assesses the impact of climate through 4 elements of climate: thermal comfort index; average rainfall; cloud cover and average wind speed. The result shows that Ba Ria - Vung Tau province has the most favorable level of climate for tourism development. Moreover, the monthly HCI index shows that the most suitable period for tourist activities every year usually appears from December to February of the following year with favorable levels from Good to Very Good.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81149521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-01DOI: 10.18173/2354-1059.2022-0006
Loi Nguyen Van
The technological parameters affecting the recovery yield of Morinda citrifolia L. juice are the concentration of pectinase enzyme, hydrolisis temperature, and hydrolisis time. From that, a process of extraction and recovery of Morinda citrifolia L. juice was developed, with some technological parameters being the concentration of pectinase enzyme used at 0.4%, hydrolisis temperature of 40oC, hydrolisis time of 240 minutes, in this condition, the recovery efficiency yield of Morinda citrifolia L. juice is more than 90%. Besides, it has also been determined that the pressure to recover Morinda citrifolia L. juice is 200kgcm2, the pressing time is 10 minutesbatch, the centrifugation speed is 8000 rpm and the centrifugation time is 15 minutes. The obtained Morinda citrifolia L. juice is stored in a specialized dark PE plastic bottle with a capacity of 1.5 liters and stored at a temperature of 2 - 4oC. Some biochemical indicators such as total sugar, total protein, vitamin C and color, odor, taste, and clarity parameters of Morinda citrifolia L. juice were determined by analytical methods.
影响桑葚汁回收率的工艺参数有:果胶酶浓度、水解温度、水解时间。在此基础上，研究了桑葚汁的提取与回收工艺，工艺参数为果胶酶用量0.4%，水解温度40℃，水解时间240 min，在此条件下桑葚汁的提取率可达90%以上。此外，还确定了回收桑葚汁的压力为200kgcm2，压榨时间为10 min 批，离心速度为8000 rpm，离心时间为15 min。将获得的桑葚汁储存在容量为1.5升的专用深色PE塑料瓶中，温度为2 - 4℃。采用分析方法测定了桑葚汁的总糖、总蛋白、维生素C等生化指标以及色、香、味、透明度等指标。
{"title":"Determination of some suitable technology conditions to improve recovery performance of Morinda citrifolia L. juice","authors":"Loi Nguyen Van","doi":"10.18173/2354-1059.2022-0006","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0006","url":null,"abstract":"The technological parameters affecting the recovery yield of Morinda citrifolia L. juice are the concentration of pectinase enzyme, hydrolisis temperature, and hydrolisis time. From that, a process of extraction and recovery of Morinda citrifolia L. juice was developed, with some technological parameters being the concentration of pectinase enzyme used at 0.4%, hydrolisis temperature of 40oC, hydrolisis time of 240 minutes, in this condition, the recovery efficiency yield of Morinda citrifolia L. juice is more than 90%. Besides, it has also been determined that the pressure to recover Morinda citrifolia L. juice is 200kgcm2, the pressing time is 10 minutesbatch, the centrifugation speed is 8000 rpm and the centrifugation time is 15 minutes. The obtained Morinda citrifolia L. juice is stored in a specialized dark PE plastic bottle with a capacity of 1.5 liters and stored at a temperature of 2 - 4oC. Some biochemical indicators such as total sugar, total protein, vitamin C and color, odor, taste, and clarity parameters of Morinda citrifolia L. juice were determined by analytical methods.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87348669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-01DOI: 10.18173/2354-1059.2022-0001
Anh Tran Duc
Pappus’s theorem is a classical result in geometry. We present four proofs for Pappus’s theorem. Each proof makes use of different tools and techniques.
帕普斯定理是几何学中的一个经典结果。我们给出了帕普斯定理的四个证明。每个证明使用不同的工具和技术。
{"title":"Four proofs for Pappus’s theorem","authors":"Anh Tran Duc","doi":"10.18173/2354-1059.2022-0001","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0001","url":null,"abstract":"Pappus’s theorem is a classical result in geometry. We present four proofs for Pappus’s theorem. Each proof makes use of different tools and techniques.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85276240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-01DOI: 10.18173/2354-1059.2022-0007
Toan Vu Duc, Loi Dao Nhan
Among the currently known bat species composition recorded from Vietnam, 12 species of Myotis distribute in the northern region: Myotis altarium, M. alticraniatus, M. annamiticus, M. annectans, M. chinensis, M. hasseltii, M. horsfieldii, M. indochinensis, M. laniger, M. montivagus, M. muricola và M. pilosus. Data on these Myotis species, particularly echolocation, is limited because almost all of them have been rarely recorded over the field surveys. Between 2020 and 2021, we conducted a series of bat surveys in northern Vietnam with an emphasis on Myotis species. Results from our studies included new data in morphology and echolocation of three species: Myotis alticraniatus, M. muricola and M. pilosus. External measurements of these species from Ha Long Bay are larger than those in previous publications. Their echolocation parameters (start frequency, end frequency, call duration) also differ from those in published descriptions. This paper provides new records of the three Myotis species from Ha Long Bay for further research, monitoring and conservation actions in the future.
在越南记录到的已知蝙蝠种类组成中，有12种分布于北部地区:altarium Myotis、alticraniatus M.、annamiticus M.、annectans M.、chinensis M.、hasseltii M.、horsfieldii M.、indochinensis M. laniger、montivagus M.、muricola vous M. pilosus。关于这些Myotis物种的数据，特别是回声定位，是有限的，因为几乎所有的Myotis物种都很少在野外调查中被记录下来。在2020年至2021年期间，我们在越南北部进行了一系列蝙蝠调查，重点是Myotis物种。我们的研究结果包括了3个物种的形态学和回声定位的新数据:高颅肌鼠、muricola鼠和毛鼠鼠。这些物种在下龙湾的外部测量值比以前的出版物要大。它们的回声定位参数(开始频率、结束频率、呼叫持续时间)也不同于已发表的描述。本文提供了下龙湾三种Myotis的新记录，为今后的研究、监测和保护工作提供参考。
{"title":"New morphological and acoustic records of Myotis species (Mammalia: Chiroptera: Vespertilionidae) from northern Vietnam","authors":"Toan Vu Duc, Loi Dao Nhan","doi":"10.18173/2354-1059.2022-0007","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0007","url":null,"abstract":"Among the currently known bat species composition recorded from Vietnam, 12 species of Myotis distribute in the northern region: Myotis altarium, M. alticraniatus, M. annamiticus, M. annectans, M. chinensis, M. hasseltii, M. horsfieldii, M. indochinensis, M. laniger, M. montivagus, M. muricola và M. pilosus. Data on these Myotis species, particularly echolocation, is limited because almost all of them have been rarely recorded over the field surveys. Between 2020 and 2021, we conducted a series of bat surveys in northern Vietnam with an emphasis on Myotis species. Results from our studies included new data in morphology and echolocation of three species: Myotis alticraniatus, M. muricola and M. pilosus. External measurements of these species from Ha Long Bay are larger than those in previous publications. Their echolocation parameters (start frequency, end frequency, call duration) also differ from those in published descriptions. This paper provides new records of the three Myotis species from Ha Long Bay for further research, monitoring and conservation actions in the future.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77114329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-01DOI: 10.18173/2354-1059.2022-0003
Thao Nguyen Thi, Vinh Le Van
Molecular dynamics (MD) simulations have been used to study three samples of (AlN)0.9(Si3N4)0.1 ceramic materials with density varying from 2.95 to 3.88 g.cm-3. The influence of density on microstructure, such as the change of structural units, bond lengths, the nearest common neighbors, and voids, was studied in detail. The analysis shows that these samples consist of regions of AlN and Si3N4 materials. The region of AlN material consists mostly of AlN crystals and small amount of AlN amorphous. The region of Si3N4 material has amorphous structure. Void analysis shows that there is the diffusion of Si atoms into the AlN amorphous region and conversely there is the diffusion of Al atoms into the Si3N4 amorphous region. The voids with large radius are localized in the amorphous structure region. The number of these voids decreases rapidly with the increase of density. This reduction improves significantly mechanical properties of samples.
{"title":"Density effects on microstructures and mechanical behavior of (AlN)0.9(Si3N4)0.1 ceramic","authors":"Thao Nguyen Thi, Vinh Le Van","doi":"10.18173/2354-1059.2022-0003","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0003","url":null,"abstract":"Molecular dynamics (MD) simulations have been used to study three samples of (AlN)0.9(Si3N4)0.1 ceramic materials with density varying from 2.95 to 3.88 g.cm-3. The influence of density on microstructure, such as the change of structural units, bond lengths, the nearest common neighbors, and voids, was studied in detail. The analysis shows that these samples consist of regions of AlN and Si3N4 materials. The region of AlN material consists mostly of AlN crystals and small amount of AlN amorphous. The region of Si3N4 material has amorphous structure. Void analysis shows that there is the diffusion of Si atoms into the AlN amorphous region and conversely there is the diffusion of Al atoms into the Si3N4 amorphous region. The voids with large radius are localized in the amorphous structure region. The number of these voids decreases rapidly with the increase of density. This reduction improves significantly mechanical properties of samples.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74464773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-01DOI: 10.18173/2354-1059.2022-0009
Sang Do Duc, Sơn Nguyễn Thành, Lan Do Hai
As terrestrial snails are poorly studied and understood in Pu Mat National Park, a preliminary survey was conducted to establish their diversity. A total of 29 species and subspecies representing 11 families are documented, of which three species recorded for Central Vietnam (Microcystina vernacula, Plectotropis xydaea, and Trachia cordieri) and 12 species for Nghe An Province are herein published for the first time. Families Cyclophoridae (9 species, 31.03%), Camaenidae (6 species, 20.68%), Ariophantidae (4 species, 13.79%) were found to be the most diverse in the area. The annotated checklist of terrestrial snails from Pu Mat N.P. is presented for the first time, as a scientific basis for the conservation and sustainable development of terrestrial snails in Pu Mat N.P.
{"title":"Preliminary data on terrestrial snails (Mollusca: Gastropoda) in Pu Mat National Park, Nghe An Province, Vietnam","authors":"Sang Do Duc, Sơn Nguyễn Thành, Lan Do Hai","doi":"10.18173/2354-1059.2022-0009","DOIUrl":"https://doi.org/10.18173/2354-1059.2022-0009","url":null,"abstract":"As terrestrial snails are poorly studied and understood in Pu Mat National Park, a preliminary survey was conducted to establish their diversity. A total of 29 species and subspecies representing 11 families are documented, of which three species recorded for Central Vietnam (Microcystina vernacula, Plectotropis xydaea, and Trachia cordieri) and 12 species for Nghe An Province are herein published for the first time. Families Cyclophoridae (9 species, 31.03%), Camaenidae (6 species, 20.68%), Ariophantidae (4 species, 13.79%) were found to be the most diverse in the area. The annotated checklist of terrestrial snails from Pu Mat N.P. is presented for the first time, as a scientific basis for the conservation and sustainable development of terrestrial snails in Pu Mat N.P.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86441171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-01DOI: 10.18173/2354-1059.2021-0081
Tuyet Le Thi, Dao Duong Thi Anh, Tu Dang Thi Ngoc, Thu Nguyen Thi Trung, Hanh Nguyen Thi Hong, Trang Do Thi Nhu, Huong Nguyen Thi Lan, Ngoc Nguyen Thi Bich, Hoan Le Ngoc, Hung Nguyen Phuc
The aim of the study was to determine the status of the creativity quotient (CQ) in 120 students of 10th grade in High school for gifted student, Hanoi National University of Education and define the association between some environmental factors and CQ. The method to determine CQ was the test for creative thinking - drawing production (TCT-DP). The results showed that 3% of the students were at A level, 15% are B level, 23% are C level, 44% are D level, 7% are E level, 6% are F level and 2% are G level. Some factors related to family characteristics that reduce the risk of low CQ and increase the posibility of high CQ were: stable occupation of parents, number of children in the family, strict mother, supportive parents when children make mistakes. Factors about children's activities that helped increase their creativity include: volunteer to be a class official, enroll in extracurricular clubs, participating in the artistic activities and enjoy artistic activities.
{"title":"Creativity quotient status and the association between some environmental factors and creativity quotient of 10th grade students in High School for Gifted Students, Hanoi National University of Education","authors":"Tuyet Le Thi, Dao Duong Thi Anh, Tu Dang Thi Ngoc, Thu Nguyen Thi Trung, Hanh Nguyen Thi Hong, Trang Do Thi Nhu, Huong Nguyen Thi Lan, Ngoc Nguyen Thi Bich, Hoan Le Ngoc, Hung Nguyen Phuc","doi":"10.18173/2354-1059.2021-0081","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0081","url":null,"abstract":"The aim of the study was to determine the status of the creativity quotient (CQ) in 120 students of 10th grade in High school for gifted student, Hanoi National University of Education and define the association between some environmental factors and CQ. The method to determine CQ was the test for creative thinking - drawing production (TCT-DP). The results showed that 3% of the students were at A level, 15% are B level, 23% are C level, 44% are D level, 7% are E level, 6% are F level and 2% are G level. Some factors related to family characteristics that reduce the risk of low CQ and increase the posibility of high CQ were: stable occupation of parents, number of children in the family, strict mother, supportive parents when children make mistakes. Factors about children's activities that helped increase their creativity include: volunteer to be a class official, enroll in extracurricular clubs, participating in the artistic activities and enjoy artistic activities.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82458709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-01DOI: 10.18173/2354-1059.2021-0073
Hau Tran Duc, Huong Dang Thi Thanh, Thu Thuy Ta Thi, Xuan Ngo Thanh
The genus Pareuchiloglanis (Siluriformes: Sisoridae) consists of 26 species in the world. In Vietnam, this genus has eight species, including five that are in uncertain taxonomy status. In the present study, we described one species of Pareuchiloglanis based on collections from the Da River basin in Phong Tho district, Lai Chau province. Pareuchiloglanis sp. can be distinguished from congeners by the following unique combination of characters: D. i,6; A. i,4; P1. i,14-16 (primarily i,16); C. i,6-8,6-8,i (primarily i,8,8,i); interorbital distanceeye diameter 2.4-3.4; caudal peduncle length 17.1-21.5; caudal pedunle depth 6.0-7.0% SL; length of adipose basedorsal to adipose distance averaged 1.8; head length 19.2-24.3; anal-fin origin closer to the anus than to the caudal-fin base; adipose-fin base posterior to the tip of pelvic-fin rays; the pelvic-fin insertion located opposite to the fourth dorsal fin-ray element; maxillary barbel extending just beyond base of first pectoral-fin element; and yellow patches on dorsal surface (a broader pair on the last doral-fin ray, as large as two thirds length of pelvic-fin). Morphological analysis showed that Pareuchiloglanis sp. are closed to two species in the same surveyed area, P. tamduongensis and P. songdaensis. This paper also indicated morphological differences between Pareuchiloglanis sp. and other species that have yellow patches on dorsal surface. This species record implied the potential of biodiversity of Pareuchiloglanis in the headwaters of the Red River. These findings provide worthy data for further studies on taxonomy of this genus in northern Vietnam.
{"title":"Description of Pareuchiloglanis sp. (Siluriformes: Sisoridae) in the Da River basin belonging to Phong Tho district, Lai Chau province","authors":"Hau Tran Duc, Huong Dang Thi Thanh, Thu Thuy Ta Thi, Xuan Ngo Thanh","doi":"10.18173/2354-1059.2021-0073","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0073","url":null,"abstract":"The genus Pareuchiloglanis (Siluriformes: Sisoridae) consists of 26 species in the world. In Vietnam, this genus has eight species, including five that are in uncertain taxonomy status. In the present study, we described one species of Pareuchiloglanis based on collections from the Da River basin in Phong Tho district, Lai Chau province. Pareuchiloglanis sp. can be distinguished from congeners by the following unique combination of characters: D. i,6; A. i,4; P1. i,14-16 (primarily i,16); C. i,6-8,6-8,i (primarily i,8,8,i); interorbital distanceeye diameter 2.4-3.4; caudal peduncle length 17.1-21.5; caudal pedunle depth 6.0-7.0% SL; length of adipose basedorsal to adipose distance averaged 1.8; head length 19.2-24.3; anal-fin origin closer to the anus than to the caudal-fin base; adipose-fin base posterior to the tip of pelvic-fin rays; the pelvic-fin insertion located opposite to the fourth dorsal fin-ray element; maxillary barbel extending just beyond base of first pectoral-fin element; and yellow patches on dorsal surface (a broader pair on the last doral-fin ray, as large as two thirds length of pelvic-fin). Morphological analysis showed that Pareuchiloglanis sp. are closed to two species in the same surveyed area, P. tamduongensis and P. songdaensis. This paper also indicated morphological differences between Pareuchiloglanis sp. and other species that have yellow patches on dorsal surface. This species record implied the potential of biodiversity of Pareuchiloglanis in the headwaters of the Red River. These findings provide worthy data for further studies on taxonomy of this genus in northern Vietnam.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81497566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-01DOI: 10.18173/2354-1059.2021-0069
Chinh Bui Thi, Nhuong Do Van, Chung Ngo Dac
The survey and sampling were conducted in Thua Thien Hue Province from May 2018 to July 2020. A total of 20 species belonging to 16 genera, 8 families, of 2 subclasses (Caenogastropoda và Heterobranchia) was recorded. Three species (Filopaludina martensi, Gabbia fuchsiana, Parafossarulus manchouricus) were first records in Thua Thien Hue area, and two species (Sulcospira dakrongensis, S. tourannensis) are endemic in Vietnam. Viviparidae is the most abundant family (6 species). Other families have 1 to 3 species. The number of species is highest in ponds habitats, and lowest in streams habitats. The similarity index reached high value in three pairs of habitats including: ponds and rivers (SI = 0.77); fields and rivers (SI = 0.75); ponds and fields (SI = 0.72). Rarefaction curves revealed that the expected number of species in ponds and rivers habitats was richer than that in fields and streams habitats.
调查和抽样于2018年5月至2020年7月在顺化省进行。共记录到2亚纲(Caenogastropoda v Heterobranchia) 8科16属20种。3种(Filopaludina martensi, Gabbia fuchsiana, Parafossarulus manchouricus)在顺化地区首次记录，2种(Sulcospira dakrongensis, S. tourannensis)为越南特有种。胎胎鸟科是数量最多的科(6种)。其他科有1至3种。池塘生境的物种数量最多，溪流生境的物种数量最少。3对生境的相似性指数较高，包括:池塘和河流(SI = 0.77);田野和河流(SI = 0.75);池塘和田野(SI = 0.72)。稀疏曲线显示，池塘和河流生境的物种预期数量比田野和溪流生境的物种预期数量要多。
{"title":"Diversity of the Gastropoda in freshwater of the mainland in Thua Thien Hue","authors":"Chinh Bui Thi, Nhuong Do Van, Chung Ngo Dac","doi":"10.18173/2354-1059.2021-0069","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0069","url":null,"abstract":"The survey and sampling were conducted in Thua Thien Hue Province from May 2018 to July 2020. A total of 20 species belonging to 16 genera, 8 families, of 2 subclasses (Caenogastropoda và Heterobranchia) was recorded. Three species (Filopaludina martensi, Gabbia fuchsiana, Parafossarulus manchouricus) were first records in Thua Thien Hue area, and two species (Sulcospira dakrongensis, S. tourannensis) are endemic in Vietnam. Viviparidae is the most abundant family (6 species). Other families have 1 to 3 species. The number of species is highest in ponds habitats, and lowest in streams habitats. The similarity index reached high value in three pairs of habitats including: ponds and rivers (SI = 0.77); fields and rivers (SI = 0.75); ponds and fields (SI = 0.72). Rarefaction curves revealed that the expected number of species in ponds and rivers habitats was richer than that in fields and streams habitats.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88868416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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