Variability in water chemistry in the Lower Mekong Basin: Considerations for fish life history reconstruction

被引:11
|
作者
Vu, An V. [1 ,2 ]
Baumgartner, Lee J. [2 ]
Doran, Gregory S. [3 ]
Mallen-Cooper, Martin [2 ,4 ]
Thiem, Jason D. [2 ,5 ]
Howitt, Julia A. [2 ,6 ]
Limburg, Karin E. [7 ]
Gillanders, Bronwyn M. [8 ,9 ]
Cowx, Ian G. [10 ]
机构
[1] Res Inst Aquaculture 2, 116 Nguyen Dinh Chieu St,Dist 1, Ho Chi Minh City, Vietnam
[2] Charles Sturt Univ, Inst Land Water & Soc, POB 789, Albury, NSW 2640, Australia
[3] Charles Sturt Univ, Graham Ctr Agr Innovat, Sch Agr & Wine Sci, Locked Bag 588, Wagga Wagga, NSW 2678, Australia
[4] Fishway Consulting Serv, 8 Tudor Pl, St Ives Chase, NSW 2075, Australia
[5] Narrandera Fisheries Ctr, Dept Primary Ind, POB 182, Narrandera, NSW 2700, Australia
[6] Charles Sturt Univ, Sch Agr & Wine Sci, Locked Bag 588, Wagga Wagga, NSW 2678, Australia
[7] SUNY Syracuse, Coll Environm Sci & Forestry, Syracuse, NY 13210 USA
[8] Univ Adelaide, Sch Biol Sci, Southern Seas Ecol Labs, Adelaide, SA, Australia
[9] Univ Adelaide, Sch Biol Sci, Environm Inst, Adelaide, SA, Australia
[10] Univ Hull, Hull Int Fisheries Inst, Kingston Upon Hull HU6 7RX, N Humberside, England
关键词
Fish movements; Mekong river; Microchemistry; Trace metals; Variation; OTOLITH CHEMISTRY; FRESH-WATER; ENVIRONMENTAL HISTORIES; DISSOLVED BARIUM; ESTUARINE FISH; TRACE-ELEMENTS; SALINITY; STRONTIUM; DELTA; PATTERNS;
D O I
10.1016/j.ecss.2021.107355
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Spatial and temporal variation of nine elements (Ba, Ca, Cu, Mg, Mn, Na, Se, Sr, and Zn) and some additional environmental parameters (salinity, water levels, and conductivity) were examined over two 2,000 km along the length of the main Mekong River channel from Luang Prabang in Northern Lao PDR to the Mekong Delta in Vietnam. Longitudinal profiles of some dissolved elemental concentrations varied significantly along the river channel. For example, Sr concentration in marine water was up to 83 times higher than in fresh water. By contrast, Ba concentration was around 4 times higher in fresh water than in marine water, but was significantly influenced by inflows from major tributaries in Cambodia (dilution effects). We found dissolved Ba was elevated in low salinity. Furthermore, Sr concentration was more variable than Ba, especially in the Mekong Delta due to different tidal influences in each of the Delta branches. Selenium was only present along the coast and one river branch in the delta. The variation in water chemistry of the Mekong main channel identified through this study provides information that can be used in the interpretation of regional fish movements using otolith chemistry, including across the freshwater, estuarine and marine interface. Accurate interpretation is essential given the Lower Mekong Basin has a high biodiversity that is under threat from rapid development, and substantial knowledge gaps exist on the life history requirements of numerous fish species.
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页数:13
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