Assessment of spatial distribution and potential ecological risk of the heavy metals in relation to granulometric contents of Veeranam lake sediments, India.

Pratoomyot, J., Srivilas, P. and Noiraksar, T. Fatty acids composition of 10 microalgal species

https://rdo.psu.ac.th/sjstweb/journal/27-6/06-microalgal-species.pdf

Fatty acids composition of 10 microalgal species

http://www.sciencemag.org/content/44/1138/573.full.pdf

The Sessile Barnacles (Cirripedia) contained in the Collections of the U. S. National Museum; including a Monograph of the American Species

Pitombo, F. B. (2004). Phylogenetic analysis of the Balanidae (Cirripedia, Balanomorpha). —Zoologica Scripta, 33, 261–276.



Our concept of the family Balanidae has undergone many changes since it was originally proposed, and it is now a more circumscribed group. Nevertheless, there are no studies of the phylogenetic relationships among its currently recognized subfamilies: Balaninae, Concavinae and Megabalaninae. Here, a new suite of characters is presented, thus allowing a better evaluation of the systematics of the group. A fourth subfamily, the Amphibalaninae, is proposed to accommodate Amphibalanus gen. nov. and its allies, and Perforatus gen. nov. is proposed and transferred to the Concavinae (all formerly Balaninae). A phylogenetic analysis of the Balanidae was performed. The results showed that Balaninae is basal to the other three subfamilies as well as Concavinae, and Megabalaninae forms a monophyletic group. Hypotheses of character evolution are presented and discussed. As a general pattern, Concavinae and Megabalaninae have the most derived structures, such as the extension of the lateral margin of the sheath, inner face of radii with a longitudinal abutment, basis multilayered (vesicular) and a spur with infolded margins.

Phylogenetic analysis of the Balanidae (Cirripedia, Balanomorpha)

The distribution, sources and ecological risk of heavy metals in surface sediments from Lake Taihu were studied. Results showed that the measured heavy metals had varied spatial distribution patterns, indicating that they had complex origins and controlling factors. Pearson's correlation analysis revealed that the total phosphorus and the loss on ignition were positively correlated with the measured metals except Cd. Principal component analysis and cluster analysis demonstrated that Hg, Cu, Cr, Cd and Pb might originate from domestic sewage and industrial wastewater, whereas As predominantly originated from natural processes. Potential ecological risk indices indicated that sediment from Wuli Lake, Gonghu Bay and the Northwest Area suffered high pollution, whereas other areas of Lake Taihu were moderately polluted. A comparison of metal levels with the effects range low (ERL) and effects range median (ERM) showed that metals exceeded their corresponding ERL limit at 13.6–72.3% (72.3% for As, 52.4% for Pb, 27.7% for Cu, 22.8% for Cd, 16.0 for Hg and 13.6% for Cr) of the sites investigated. Moreover, 3.90% and 0.50% of the sites sampled exceeded the ERM thresholds for Hg and Pb, respectively.

http://iopscience.iop.org/article/10.1088/1748-9326/6/4/044012/pdf

Distribution, sources and ecological risk assessment of heavy metals in surface sediments from Lake Taihu, China

The concentrations of Co, Ni, Cu, Zn, Cd, Pb, As, Fe, Mn, and Al were determined in sediments and biota of Songkhla Lake, a shallow coastal lagoon located in southern Thailand. In June 2006, surface sediments were sampled in 44 stations in the three sections of the lake (inner-, middle-, and outer sections). Sediment cores were also sampled in 13 stations in three cross-sections of the lake. In surface sediments, trace and major elements, organic matter, sediment grain size analysis, and sulfides were determined, and in the sediment cores, redox profiles were made. Soil samples were also collected at garbage dumping sites in the vicinity of the lake. In addition, the metal accumulation in two catfish species (Arius maculatus and Osteogeneiosus militaris) and the crustacean (Apseudes sapensis) was also investigated. Trace element concentrations in sediments of Songkhla Lake show that, especially the Outer section of the lake, in particular the sediments at the mouths of the Phawong, U-Taphao, and Samrong Canals are significantly enriched with trace elements due to municipal, agricultural, and industrial discharges entering the lake through the canals. Aluminum-normalized enrichment factors throughout the lake vary from 0.4 to 1.7 for Ni, 0.3 to 3.3 for Cu, 0.2 to 7 for Zn, 0.1 to 14 for As, 1 to 24 for Cd, 0.7 to 6.8 for Pb, and 0.1 to 7.8 for Mn. Correlations between the elements and sediment characteristics show that Cu, Zn, Cd, and Pb are essentially associated with the sulfide fraction; that Ni and Co are predominantly bound to the clay minerals and iron oxy-hydroxides, and that As is principally bound to iron oxy-hydroxides. The accumulation of trace elements between muscle tissue and liver and eggs of A. maculatus and O. militaris is element-specific, but concentrations of trace elements in fish muscle tissue are well within the limits for human consumption.

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Distribution of Trace Elements in Sediments and Biota of Songkhla Lake, Southern Thailand

Ariyadej, C., Tansakul, R., Tansakul, P. and Angsupanich, S. Phytoplankton diversity and its relationships to the physico-chemical environment in the Banglang Reservoir, Yala Province Songklanakarin J. Sci. Technol., 2004, 26(5) : 595-607 The diversity of phytoplankton and its relationships to the physico-chemical environment were studied in Banglang Reservoir, located on the Pattani River in Southern Thailand. Samples were collected monthly from May 2000 to April 2001 at three stations and three different depths: water surface, 10, and 30 meters. Physico-chemical parameters: temperature, pH, dissolved oxygen, alkalinity, conductivity, water transparency, and nutrients were measured simultaneously. One-hundred and thirty-five species in seven divisions of phytoplankton were found. The greatest number of species were in Division Chlorophyta (50%), followed by Cyanophyta (21%), Bacillariophyta (13%), Pyrrophyta (6%), Cryptophyta (4%), Chrysophyta (3%) and Euglenophyta (3%). The most diverse genus was Staurastrum (15 species). Phytoplankton density ranged from zero to 2.1x109 cells.m-3. Microcystis aeruginosa Kutzing in January at 30 m at the lacustrine zone had the highest phytoplankton density. By applying a PCA(principal components analysis) using the MVSP statistical analysis program on the abundance of species, it was found that Cyclotella meneghiniana ORIGINAL ARTICLE 1Ph.D. Student in Biology 2Ph.D.(Biology), Assoc Prof., 3M.S.(Botany), Assoc Prof., Department of Biology, Faculty of Science, 4Ph.D.(Aquatic Environmental Science), Assoc Prof., Department of Aquatic Science, Faculty of Natural Resources, Prince of Songkla University, Hat Yai, Songkhla, 90112 Thailand. Corresponding e-mail: chalindaa@hotmail.com Received, 29 March 2004 Accepted, 9 June 2004 Songklanakarin J. Sci. Technol. Vol. 26 No. 5 Sep.-Oct. 2004 596 Diversity and relationships to the physico-chemical environment Ariyadej, C., et al. Kutzing and Melosira varians Agardh were the most abundant in each station. Diversity index (Simpson’s diversity index) was maximum at 10 m at the transition zone and lowest at the outflow zone. The factors affecting the phytoplankton species by Canonical correspondence analysis ordination (PC-ORD program) were alkalinity, water temperature, water transparency, nutrients and conductivity. When the water quality parameters were classified by the trophic level, Banglang Reservoir belonged to oligo-mesotrophic status. Furthermore, Cyclotella meneghiniana Kutzing and Melosira varians Agardh could be used as the phytoplankton indicator of oligo-mesotrophic reservoir.

https://rdo.psu.ac.th/sjstweb/journal/26-5/01phytoplankton.pdf

Phytoplankton diversity and its relationships to the physico-chemical environment in the Banglang Reservoir, Yala Province

The phytoplankton in Thale Sap Songkhla was investigated at 2–3 month intervals from August 1991 to October 1993. The abundance of phytoplankton ranged from 1.4×106 to 1.3×109 cells m−3. A total of 6 divisions with 103 genera were identified as Bacillariophyta: 49 genera, Chlorophyta: 21 genera, Pyrrhophyta: 15 genera, Cyanophyta: 12 genera, Chrysophyta: 3 genera and Euglenophyta: 3 genera. Although phytoplankton abundance was distinctly greater in the first year of study (August 1991–June 1992) than in the second year (August 1992–October 1993), their patterns are similar: 2 peaks yearly. The peaks of phytoplankton occurred in the heavy rainy season (northeast monsoon) and the light rainy season (southwest monsoon). The main bloom was found during December–January, with a predominance of blue-green algae (e.g. Aphanizomenon andPhormidium) and green algae (e.g. Eudorina). Their species composition also increased, an effect of the large amount of rainfall resulting in low salinity during the northeast monsoon. The minor bloom was produced by diatoms during June–July when water salinity was moderate to seawater. Both phytoplankton numbers and species composition were high. However, unpredictably heavy rainfall during the southwest monsoon period may reduce diatom production due to rapid immediate replacement by blue-green species. Besides salinity concentration, a low total nitrogen: total phosphorus (TN: TP) ratio tended to support the growth of blue-green algae. The diversity of phytoplankton was lowest in the heavy rainy period.

Seasonal variation of phytoplankton community in thale sap songkhla, a lagoonal lake in southern thailand

The macrobenthic fauna of two discharge ecosystems, Phawong Canal and U-Taphao Canal flowing into Songkhla Lake in Thailand, were studied from August 1994 to August 1995. The salinity of Phawong Canal and U-Taphao Canal ranged from 0.1 to 27.8 and 0.1 to 17.0 practical salinity units (PSU), respectively. The biochemical oxygen demand (BOD) of Phawong Canal ranged from 2.5 to 33.0 mg L−1, while that of U-Taphao Canal ranged from 1.1 to 12.6 mg L−1. Temporal changes in the number of species and individuals were determined throughout a year. During the season of heavy rains (November– December), the density and number of most species decreased markedly. Only chironomid larvae increased and these were distributed in the uppermost reaches of the canals during this period. Sixty-two and 52 species of macrobenthic fauna were found in Phawong Canal and U-Taphao Canal, respectively; however, the abundance and number of species collected at each sampling was very low in the upper reaches of the canals. The most numerous benthic fauna in the Phawong Canal were polychaetes, followed by amphipods. Pelecypods and gastropods were the dominant groups in U-Taphao Canal. A distribution pattern of macrobenthic fauna associated with pollution gradients (BOD) was observed only at Phawong Canal. In addition, species diversity according to the Shannon-Wiener index only was not applicable to the assessment of benthic environmental health when the few individuals found were evenly distributed among the few species present at U-Taphao Canal. It is recommended that a coastal care project be established by the appropriate government agencies in the study areas.

Distribution of macrobenthic fauna in Phawong and U‐Taphao canals flowing into a lagoonal lake, Songkhla, Thailand

We establish the new genus Birdotanais, based on the new species B. songkhlaensis collected from brackish Songkhla Lagoon in Thailand. Birdotanais shows close similarity to members of Families Nototanaidae and Tanaissuidae; we place it in former based on the type species having black eyes and the mandibular molar bearing a broad masticatory region. Birdotanais differs from confamilial genera in having an oval pleopodal endopod with one mid-inner plumose seta, and a nearly straight dactylus-unguis bearing a tiny unguis, on pereopods 4-6. We present a key to genera in Families Nototanaidae and Tanaissuidae.

Saowapa Angsupanich

Papers

Distribution of Trace Elements in Sediments and Biota of Songkhla Lake, Southern Thailand

Phytoplankton diversity and its relationships to the physico-chemical environment in the Banglang Reservoir, Yala Province

Seasonal variation of phytoplankton community in thale sap songkhla, a lagoonal lake in southern thailand

Distribution of macrobenthic fauna in Phawong and U‐Taphao canals flowing into a lagoonal lake, Songkhla, Thailand

Birdotanais songkhlaensis, a new genus and species of nototanaidae (crustacea: tanaidacea) from thailand