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Inter-annual and seasonal variations in hydrological parameters and its implications on chlorophyll a distribution along the southwest coast of Bay of Bengal

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Acta Oceanologica Sinica 2015年第6期34卷 94-100页

作者： Shanthi R. Poornima D. Raja K. Sarangi R.K. saravanakumar A. thangaradjou t. Centre of Advanced Study in Marine Biology Faculty of Marine Sciences Annamalai University Marine Geo and Planetary Sciences Group Space Application Centre (ISRO)

Seasonal and inter-annual variability of hydrological parameters and its impact on chlorophyll distribution was studied from January 2009 to December 2011 at four coastal stations along the southwest Bay of Bengal. Statistical analysis （principal component analysis （PCA）, two-way analysis of variance （ANOVA） and correlation analysis） showed the significant impact of hydrological parameters on chlorophyll distribution in the study area. the ranges of different parameters recorded were 23.8-33.8℃ （SSt）, 4.00-36.00 （salinity）, 7.0-9.2 （pH）, 4.41-8.32 mg/L （dissolved oxygen）, 0.04-2.45 μmol/L （nitrite）, 0.33-16.10 μmol/L （nitrate）, 0.02-2.51 μmol/L （ammonia）, 0.04-3.32 μmol/L （inorganic phosphate）, 10.09-85.28 μmol/L （reactive silicate） and 0.04-13.8 μg/L （chlorophyll）. PCA analysis carried out for different seasons found variations in the relationship between physico-chemical parameters and chlorophyll in which nitrate and chlorophyll were positively loaded at PC1 （principal component 1） during spring inter-monsoon and at PC2 （principal component 2） during other seasons. Likewise correlation analysis also showed significant positive relationship between chlorophyll and nutrients especially with nitrate （~0.734）. Distribution of hydrobiological parameters between stations and distances was significantly varying as evidenced from the ANOVA results. the study found that the spatial and temporal distribution of chlorophyll was highly dependent on the availability of nutrients especially, nitrate in the southwest Bay of Bengal coastal waters.

关键词： chlorophyll nutrients PCA nitrate correlation analysis Bay of Bengal

Heavy Metal Distribution in Sediments of Muthupettai Mangroves, South East Coast of India

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Journal of Ocean University of China 2011年第4期10卷 385-390页

作者： B.thilagavathi K.Raja Bandana Das A.saravanakumar S.Vijayalakshmi t.Balasubramanian CAS in Marine Biology Faculty of Marine SciencesAnnamalai University

Core sediments from the Muthupettai mangroves on the southeast coast of India were analyzed for soil texture,total nitrogen,organic carbon,phosphorus and heavy metals(Fe,Mn,Cr,Cu,Ni,Pb,Zn and Cd).the distinct seasonal variation in the distribution of metals in the sediments was *** minimum concentration was recorded in river mouth and the maximum was in *** metal concentration in sediment was observed during monsoon and low concentration in *** total nu-trient in lagoon and river mouth was recorded in the range of 4.528 to 8.526 mg g-1 for organic carbon,2.213 to 10.5 mg g-1 for nitro-gen and 0.824 to 7.22 mg g-1.

关键词： mangroves heavy metals core sediment soil texture sediment nutrients

trend in Coral-Algal Phase Shift in the Mandapam Group of Islands, Gulf of Mannar Marine Biosphere Reserve, India

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Journal of Ocean University of China 2016年第6期15卷 1080-1086页

作者： M. Machendiranathan L. Senthilnathan R. Ranith A. saravanakumar t. thangaradjou S. B. Choudhrys S. K. Sasama Center of Advanced Studies in Marine Biology Faculty of Marine Sciences Annamalai University Parangipettai - 608502 Tamilnadu India Academy of Maritime Education and training (AMEt) University Center for Maritime Information ServicesChennai - 603112 Tamilnadu India Central Marine Fisheries Research Institute ( CMFRI) Fishery Environment Management DivisionKochi - 682018 Kerala India Science and Engineering Research Board (SERB) New Delhi - 110070 India National Remote Sensing Center lndian Space Research Organization (Dept. of Space Govt. of India)Balanagar Hyderabad - 500625 Andhra Pradesh lndia

the present study revealed proliferation of macro-algae modifying coral reef ecosystems in a different manner due to diseases and sedimentations in the Mandapam group of islands in the Gulf of Mannar. Benthic surveys were conducted with major attack of seven coral reefs diseases with high sedimentation rate, nine species of fleshy macro-algae(turbinaria ornata, turbinaria conaides, Caulerpa scalpelliformis, Caulerpa racemosa, Kappaphycus alvarezii, Padina gymnosphora, Sargassum wightii, Ulva reticulata and Calurpa lentillifera) proliferation against major corals life forms(Acropora branching, Acropora digitate, Acropora tabulate, coral massive, coral submassive, coral foliose and coral encrusting). the results confirm that diseased corals most favor to macro-algae growth(15.27%) rather than the sedimentation covered corals(8.24 %). In the degradation of coral life forms, massive corals were more highly damaged(7.05%) than any other forms. Within a short period of time(May to September), coral coverage shrank to 17.4% from 21.9%, macro-algae increased 23.51% and the average sedimentation rate attained 77.52 mg cm^(-2) d^(-1) with persisting coral reef diseases of 17.59%. the Pearson correlation showed that the coral cover decreased with increasing macro-algae growth, which was statistically significant(r =-0.774, n = 100, P the proliferation of the various macro-algae C. scalpellifrmis, t. ornata, C. racemosa, t. conaides, U. reticulata, S. wightii, K. alvarezii, P. gymnosphora and C. lentillifera increased with percentages of 6.0, 5.8, 5.7, 4.9, 4.2, 3.7, 2.7 and 1.9, respectively. If this trend continues, the next generation of new recruit corals will undoubtedly lead to a phase shift in Gulf of Mannar corals.

关键词： climate change sedimentation disease proliferation recovery macroalgae Mandapam Gulf of Mannar

Fishery Resources in Arid Zone Mangroves in Gulf of Kachchh, Gujarat, Northwest Coast of India

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Journal of Ocean University of China 2009年第3期8卷 233-240页

作者： A. saravanakumar M. Rajkumar J. Sesh Serebiah G. A. thivakaran Centre of Advanced Study in Marine Biology Annamalai University Marine Studies and Coastal Resource Management Madras Christian College Gujarat Institute of Desert Ecology

the finfish and shellfish resources were assessed quantitatively and qualitatively in regard to their abundance in creek waters at three sites within a period of two years, fi＇om January 1999 to December 2000, in the western mangrove areas of Kachchh. the catch rate varied from 0.69 to 6.99kg·h^-1. It was low during monsoon （July to October）, which could be due to the freshwater-flow-induced salinity reduction in all the sites. Among 38 species recorded, 5 were shellfish and 33 were finfish. the spawning period of fishes was found to be during summer and early monsoon period （May to August）. Surface water temperatures varied from 17℃ to 37 ℃. Salinity values varied from 34 to 44 and the pH ranged between 7 and 8.9. Variation in dissolved oxygen content was from 3.42 to 5.85 mL L^-1. the high fishery densities in these semi arid mangrove creek areas were recorded during monsoon and early winter season.

关键词： mangroves Gulf of Kachchh Gujarat finfish and shellfish species diversity richness evenness

Benthic Macrofaunal Assemblage in the Arid Zone Mangroves of Gulf of Kachchh-Gujarat

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Journal of Ocean University of China 2007年第3期6卷 303-309页

作者： A. saravanakumar J. Sesh Serebiah G. A. thivakaran M. Rajkumar CAS in Marine Biology Annamalai UniversityParangipettaiIndia Gujarat Institute of Desert Ecology BhujGujaratIndia

the total benthic macrofauna consisting of 62 species in 5 groups,viz. crustaceans(18),gastropods(17),bivalves(16),polychaetes(9) and fishes(2),was recorded in western Kachchh mangroves near Gujarat. the population densities of benthic macro-fauna ranged from 424 to 2393 ind.m-2,the diversity ranged from 1.84 to 2.45 bits ind.-1,the richness varied between 0.82 and 0.98,and the evenness varied between 0.64 and 0.81. two maximum diversity values were recorded during winter and summer. the salin-ity ranged from 34 to 44,temperature varied between 17 and 37 ℃,and the acidity ranged from 7 to 8.9.

关键词： mangroves Gulf of Kachchh macrofauna

triggering the biocontrol of Botrytis cinerea by trichoderma harzianum through inhibition of pathogenicity and virulence related proteins

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Frontiers of Agricultural Science and Engineering 2018年第2期5卷 271-279页

作者： Kandasamy saravanakumar Zhixiang LU Hai XIA Meng WANG Jianan SUN Shaoqing WANG Qiang-qiang WANG Yaqian LI Jie CHEN School of Agriculture and Biology/State Key Laboratory of Microbial Metabolism/Key Laboratory of Urban Agriculture (South) of the Ministry of Agriculture Shanghai Jiao Tong University

this study reports a strain of trichoderma harzianum CCtCC-SBW0162 with potential to enhance biocontrol activity against gray mold pathogen, Botrytis cinerea, and with a pivotal role in tomato(Solanum esculentum) plant growth enhancement. A total of 254 trichoderma isolates were screened by in vitro antagonistic assay. Of these, 10 were selected for greenhouse experiments based on their greater inhibition of B. *** in vitro antagonistic assay and greenhouse experiments indicated that t. harzianum CCtCC-SBW0162 gave the highest inhibition rate(90.6%) and disease reduction(80.7%). Also, to study the possible mechanism associated with antifungal activity of CCtCC-SBW0162 against B. cinerea, molecular docking was used to assess the interactions between CCtCC-SBW0162-derived metabolites, and pathogencity and virulence related proteins of B. cinerea. the molecular docking results indicated that the combination of harzianopyridone,harzianolide and anthraquinone C derived from CCtCCSBW0162 could synergistically improve antifungal activity against B. cinerea through the inhibition/modification of pathogenicity and virulence related ***, this computerized modeling work emphasized the need for further study in the laboratory to confirm the effect t. harzianum-derived metabolites against the proteins of B. cinerea and their interactions.

关键词： anthraquinone Botrytis cinerea harzianolide harzianopyridone molecular docking trichoderma harzianum