Summary of Biology doctoral thesis: Research on ragworm (Nereididae: Tylorrhynchus) in soil ecosystem in the northern coastal area of Vietnam

The objective of the thesis is to research Ragworm (Nereididae: Tylorrhynchus) in soil macrofauna community structure in the northern coastal area of Vietnam and identify some living environment conditions of the Ragworm in the study area. Ruoi habitats in the study area to provide scientific and practical basic for their conservation and development.
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Summary of Biology doctoral thesis: Research on ragworm (Nereididae: Tylorrhynchus) in soil ecosystem in the northern coastal area of Vietnam 1 MINISTRY OF VIETNAM ACADEMY EDUCATION AND OF SCIENCE AND TRAINING TECHNOLOGY GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY ---------------------------- NGUYEN THI HA RESEARCH ON RAGWORM (NEREIDIDAE: TYLORRHYNCHUS) IN SOIL ECOSYSTEM IN THE NORTHERN COASTAL AREA OF VIETNAM Major: Theory of Zoology Major code: 9 42 01 03 SUMMARY OF BIOLOGY DOCTORAL THESIS Ha Noi - 2020 2 3 The work was completed at: Academy of Science and Technology - Vietnam Academy of Science and Technology. Science of supervisor 1: Prof.Dr. of science Vu Quang Manh Science of supervisor 2: PhD. Le Hung Anh Science reviewer 1: Science reviewer 2: Science reviewer 3: The thesis will be defended in front of the Institute's doctoral thesis evaluation council, meeting at the Academy of Science and Technology - Vietnam Academy of Science and Technology at … hour, date… month…year 2020. The thesis can be found at: - Library of Academy of Science and Technology - Vietnam National Library 4 INTRODUCTION 1. Reasons to choose a topic With a coastline of more than 3,200 km, along with dense estuary systems and monsoon tropical climate created for Vietnam in general and northern Vietnam in particular has estuary coastal ecosystem speciality and have the highest biological productivity. Groups include Mollusca, Arthropoda, Annelida and are component soil macrofauna community structure in the northern coastal area of Vietnam. In particular, in phylum Annelida, it is impossible not to mention genus Tylorrhynchus of the familia Nereidida, ordo Phyllodocida, class Polychaeta which has important role in the estuarine and marine ecosystems. In the world, polychaeta are found in Japan, South China, Singapore, Indonesia ... with the number of discovered species of more than 5000 species divided into 86 families. This group have important role in the food chain and net, additional ragworm are also considered as an indicator group of organisms to assess the quality of the water and bottom environment. In our country, the appearance of ragworm has been mentioned by Nguyen Cong Tieu and Nguyen Cong Tru from the seventeenth and eighteenth centuries, many authors have published a list of hundreds of polychaeta species which appeared in Vietnam, especially there are species that have the ability to go deep into the mainland. However, questions about the Ragworm that are favored by the Vietnamese people as a nutritious food source have not been studied: i) Are they in the list of published polychaeta in Vietnam? ii) In addition, with the change of time, space, climate changes, and 5 living environment, the Ragworm in different provinces of Northern Vietnam have differences, morphological changes or is not?. additional, during the their life cycle, the ragworm has a time to live in the soil but there has not been any research to consider the Ragworm as a component in soil macrofauna community structure in the northern coastal area of Vietnam. With the above scientific and practical basis, a basic survey of the research on the Ragworm as a component in soil macrofauna community structure in ecosystem is necessary. On that basis, we choose to research topic Research on ragworm (Nereididae: Tylorrhynchus) in soil ecosystem in the northern coastal area of Vietnam”. 2. The purpose of the thesis The objective of the thesis is to research Ragworm (Nereididae: Tylorrhynchus) in soil macrofauna community structure in the northern coastal area of Vietnam and identify some living environment conditions of the Ragworm in the study area. Ruoi habitats in the study area to provide scientific and practical basic for their conservation and development. 3. Research content 1/ Taxonomy of ragworm (Nereididae: Tylorrhynchus) by the traditional morphological combined DNA molecular biotechnology, in soil ecosystems in the coastal areas of Northern Vietnam. 2/ Research Ragworm in soil macrofauna community structure according to five types of habitats, the five vertical deep layers in the soil and the four seasons in the study area. 6 3/ Surveying some characteristics of the Ragworm habitat, contributing to their development and conservation in the study area. 4. The meaning of the thesis Scientific significance: For the first time, Ragworm (Nereididae: Tylorrhynchus) has been studied as a component in soil macrofauna community structure in the northern coastal area of Vietnam. The results of the thesis provide the taxonomic position of the ragworm, new data on the relationship of the Ragworm with other Macrofauna groups s in soil in terms of composition, density, biomass and some elements of the habitat of the Ragworm in the study area Practical significance: The practical significance of the thesis is that the data obtained on taxonomy, biological characteristics, ecology of the ragworm in soil macrofauna community structure in the northern coastal area of Vietnam are the basis for further studies to propose a number of conservations and special to properly use, develop and exploit the resources of the Ragworm in the northern Vietnam in general and Hai Duong in particular. In addition, these data contribute to build books, related curricula and teaching topics at undergraduate and postgraduate level. 7 Chapter 1: Overview 1.1. Sit ...