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 ผลงานตีพิมพ์ในวารสารวิชาการSpatio-temporal variations in fish assemblages in a tropical regulated lower river course: An environmental guildผู้แต่ง: Jutagate, T., Lek, S., Sawusdee, A., Sukdiseth, U.,  Dr.Thanitha Darbanandana, Associate Professor, Thongkhoa, S., Lek-Ang, S., P. Chotipuntu, วารสาร:  
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ผลงานตีพิมพ์ในวารสารวิชาการEffects of an anti-salt intrusion dam on tropical fish assemblagesผู้แต่ง:Jutagate, T, Sawusdee, A, Dr.Thanitha Darbanandana, Associate Professor, Lek, S, Grenouillet, G, Thongkhoa, S, Chotipuntu, P, วารสาร: |
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Fish in the Pak Panang Bay and River in Relation to the Anti-Salt Dam Operation, Part I: Assemblage Patterns of the Marine and Brackish Water Fish) ผู้เขียน:ทวนทอง จุฑาเกตุ, อมรศักดิ์ สวัสดี, Thanitha Thapanand Chaidee, Sutheera Thongkhoa, นายปิยะพงศ์ โชติพันธุ์ สื่อสิ่งพิมพ์:pdf AbstractSpatio-temporal patterns of marine and brackish water fish assemblages gradated from the upstream of the anti-salt dam “Uthokawiphatprasid” dam to the Pak Panang Bay, southern of Thailand. The samples were collected between March 2006 to June 2007at six sampling sites (three sites each from above and below the dam). A total of 70 fish species belonging to 68 genera and 44 families were sampled. To analyze patterns of fish assemblages, an artificial neural network (ANN) in the form of a self-organizing map (SOM) was applied. The sample-combinations (sluice gate regime (opening or closing), sampling stations and months of sampling) were classified into four clusters related to the spatial location and sluice gate regimes. Six assemblage patterns were further explained by the probability of occurrences and ranges of salinity levels. The largest group was opportunistic marine fish (21 species) followed by true brackish water fish (17 species). Others comprised of steno- and eury-haline fish as well as the anadromy. The likely impacts of each guild due to the dam regulations and further studies for conserving these fish were also discussed. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Fish in the Pak Panang River and Bay in Relation to the Anti-Salt Dam Operation, Part II: Trophic Model) ผู้เขียน:อมรศักดิ์ สวัสดี, ทวนทอง จุฑาเกตุ, Thanitha Thapanand Chaidee, Sutheera Thongkhoa, นายปิยะพงศ์ โชติพันธุ์ สื่อสิ่งพิมพ์:pdf AbstractThe ECOPATH software program was used to study the mass-balanced trophic structures and functioning of the aquatic organisms of the Pak Panang Bay and River (lower portion) to gain insight into the ecosystem due to the operation of the Uthokvibhajaprasid Dam. The resulting models were authenticated as indicated by the output parameters. There were 20 and 25 compartments for the estuary and river models, respectively. The trophic levels varied from 1.0 for primary producers and detritus to about 3.0 for carnivorous fish. Gross efficiency of the fishery indicated intensive efforts in both areas. Both systems were considered intact, since the transfer efficiency was between 10 to 15%. Small-sized brackish-water plankton feeders played an important role in linking the lower trophic organisms and top predators. Improper regulation of the sluice gates would impact these groups and result in an imbalance of the ecosystems. |
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