Assessing changes in ecological quality status of sediment in Tri An reservoir (Southeast Vietnam) by using indicator of nematode communities

[33], Black 
Sea [44], Beigang River Basin [39]. In Vietnam, 
using of the MI of NC for monitoring 
environmental qualities have emphasized in 
recent papers: Can Gio mangroves [45], Sai Gon 
River [46], Ba Lai River [47]. In this study, MI 
has been used for the first time in the assessment 
of EcoQ conditions in Tri An Reservoir, Dong 
Nai Province. 
4. Conclusion 
This is the first comprehensive study 
investigating NC and their ability to assess the 
EcoQ in TAR, Dong Nai Province. NC in TAR 
consisted of 24 genera belonging to 19 families, 
8 orders in both sampling seasons. Several 
genera indicated for organic enrichment 
conditions such as genus Daptonema, 
Rhabdolaimus, Udonchus, Neotobrilus founded 
in TAR, especially for the pre-rainy season. The 
percentage of cp1&2 increased from the dry to 
T.T. Thai et al. / VNU Journal of Science: Natural Sciences and Technology, Vol. 36, No. 1 (2020) 45-56 53 
the pre-rainy season. Moreover, the MI value in 
the dry was higher rather than that in the pre-
rainy season. This indicated that the EcoQ 
conditions in the dry were better than those in the 
pre-rainy season. Moreover, the EcoQ in TAR 
was enriched by organic matter, particularly in 
the pre-rainy season. The result also suggested 
that nematodes might be useful indicators for 
biomonitoring studies in freshwater habitats. 
However, the future study should pay more 
experience from field studies and laboratory 
experiments in order to better interpret changes 
in the composition of NC, and thus to be able to 
use sophisticated indices, such as the MI, for 
ecological quality status assessment of sediment. 
Acknowledgment 
This research was funded by the Vietnam 
Academy of Science and Technology (VAST) 
under grant number KHCBSS.02/19-21. The 
author thanks the staff of the Department of 
Environmental Management and the Department 
of Biological Resources (ITB-VAST) for 
precious help with laboratory analyses. 
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Appendix 
Appendix 1. Structure of nematode communities in Tri An Reservoir 
Genus Family Order Class Dry P-Rainy 
Achromadora Achromadoridae Chromadorida Chromadorea + + 
Aphanonchus Aphanolaimidae Plectida Chromadorea + 
Aphelenchoides Aphelenchoididae Rhabditida Chromadorea + 
Cephalobus Cephalobidae Rhabditida Chromadorea + 
Chromadorita Chromadoridae Chromadorida Chromadorea + + 
Cobbonchus Mononchidae Mononchida Enoplia + + 
Cryptonchus Cryptonchidae Mononchida Enoplia + + 
Daptonema Xyalidae Monhysterida Chromadorea + + 
Dichromadora Chromadoridae Chromadorida Chromadorea + 
Goffartia Diplogastridae Rhabditida Chromadorea + 
Ironus Ironidae Enoplida Enoplia + + 
Mesodorylaimus Dorylaimidae Dorylaimida Enoplia + + 
Mononchulus Mononchulidae Mononchida Enoplia + + 
Mononchus Mononchidae Mononchida Enoplia + + 
Monshystera Monhysteridae Monhysterida Chromadorea + + 
Monshystrella Monhysteridae Monhysterida Chromadorea + + 
Mylonchulus Mylonchulidae Mononchida Enoplia + + 
Neotobrilus Tobrilidae Triplonchida Enoplia + + 
Paractinolaimus Actinolaimidae Dorylaimida Enoplia + 
Paracyatholaimus Cyatholaimidae Chromadorida Chromadorea + 
Paraplectonema Leptolaimidae Plectida Chromadorea + + 
Plectus Plectidae Plectida Chromadorea + 
Ptycholaimelus Chromadoridae Chromadorida Chromadorea + 
Prismatolaimus Prismatolaimidae Triplonchida Enoplia + 
Rhabditidoides Diplogastridae Rhabditida Chromadorea + + 
Rhabdolaimus Rhabdolaimidae Enoplida Enoplia + + 
Theristus Xyalidae Monhysterida Chromadorea + + 
Terschellinia Linhomoeidae Monhysterida Chromadorea + 
Udonchus Rhabdolaimidae Enoplida Enoplia + +