Tintinnidsarean important protozoan group in the aquatic food web and had been widely studied in various waters. There are about 1000 known species in the world. However, there have beenvery few taxonomic studies in Vietnam and therefore the number of Tintinnid taxa and their distribution are poorly known. Thepresent study documents 65 tintinnids species belonging to 30 genera and 13 families in samples collected from Khanh Hoa - Binh Thuan waters in 2016 and 2017. There were 17 new taxa records for Vietnam protozoan fauna, raising the number of tintinnids recorded in Vietnam to 125 taxa. Tintinnid assemblages in Khanh Hoa-Binh Thuan waters shared about 17 species with Ha Long Bay, 32 species with Con Co island and 26 species with coastal waters of South Vietnam. Analysis of species diversity shows that the Shannon diversity index H' varied from 1.5 to 2.6. Distribution of species numbers and diversity in the Khanh Hoa - Binh Thuan waters revealed possible combined effects of hydrographical activities (e.g. upwelling), Mekong river influent (e.g. salinity), and food available on tintinnid communities. Citation: Nguyen Thi Kieu, Phan Tan Luom, Nguyen Tam Vinh, Nguyen Ngoc Lam, Josepth P. Montoya, Doan Nhu Hai, 2017. Biodiversity of Tintinnids (Tintinnida) in Khanh Hoa - Binh Thuan waters. Tap chi Sinh hoc, 39(4): 421-433. DOI: 10.15625/0866-7160/v39n4.11033. *Corresponding author:haidoan-ion@planktonviet.org.vn Received 19 September 2017, accepted 12 December 2017
Ngày nhận bài: 26-7-2012 TÓM TẮTSử dụng các vật mẫu thu được trong 10 năm qua trong vùng biển Nam Trung bộ, chúng tôi đã xác định có 9 loài động vật hàm tơ thuộc họ Sagittidae bao gồm Flaccisagitta hexaptera, F. enflata, Aidanosagitta neglecta, A. regularis, Ferosagitta robusta, F. ferox; Sagitta bipunctata, Serratosagitta pacifica và Zonosagitta bedoti. Các loài đã được mô tả chi tiết kèm các hình ảnh chụp dưới kính hiển vi làm rõ các đặc trưng phân loại. Flaccisagitta enflata là loài thường gặp và có mật độ cao nhất trong nhóm động vật Hàm tơ, chúng phân bố ở tầng mặt (0 -200m) ở vùng nước ấm của các đại dương trên thế giới. Trong khi đó, Flaccisagitta hexaptera là loài có kích thước lớn nhất, có thể lên đến 70mm, phân bố ở tầng mặt và tầng giữa (0 -300m) ở vùng nước ấm của các đại dương trên thế giới. Sự khác nhau về số lượng loài thuộc họ Sagittidae giữa các vùng biển nghiên cứu phụ thuộc thuộc nhiều vào số lượng vật mẫu, tần suất và phạm vi khảo sát.
Zooplankton often migrates within the water column for different purposes but mostly to find food and avoid predators. Vertical migration over 24 hours is called diel vertical migration (DVM). However, knowledge of DVM for different zooplankton species is limited. The present study analysized DVM based on species distribution in the water column at each different times of day at two stations on the central Vietnam shelf. One station was on the shelf (LT2) and another was on the shelf slope (FK002). The results showed that 69 zooplankton species, out of 191 recorded at the two stations, having strong DVM (dz > 15 m). Among them, 38 species were nocturnal and 36 species showed reverse DVM. Species with nocturnal DVM were less on the shelf station than on the shelf slope. Moreover, detailed analysis at LT2 showed 18 species having DVM at dawn and 13 species having DVM at sunrise. This study provides important data for zooplankton ecology in Vietnam and marine tropical waters.
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