Pradhan S.,Chilika Development Authority |
Mishra S.K.,Chilika Development Authority |
Baral R.,Chilika Development Authority |
Samal R.N.,Chilika Development Authority |
Mohanty P.K.,Berhampur University
Marine Geodesy | Year: 2017
Chilika, a lagoon along the east coast of India, is undergoing transformation due to frequent shoreline change near inlet(s). Shoreline change near inlet includes change in position and shape of inlet, inlet channel length, and spit growth/erosion. These variable features of lagoon inlet(s) critically depend on alongshore sediment transport (LST) and discharge (water and sediment) from the lagoon to the sea. The LST and the processes responsible for sand spit growth/erosion, considered as important attributes of inlet stability, are the subject matter of the present investigation and hence the study assumes importance. The study includes integration of observational and modeling framework. Observations include nearshore wave, bathymetry, beach profile, shoreline and sediment grain size of spits while numerical modeling includes simulation of the wave using MIKE 21 Spectral Wave model and LST simulation using LITtoral DRIFT. The results indicate that the predominant wave directions as S and SSE, which induces round the year south to north alongshore transport with significant seasonal variation in magnitude. The estimated LST closely matches with previous studies near Chilika inlet and for other locations along the Odisha coast. Besides temporal variability, the study reveals spatial variability in alongshore transport near Chilika inlet and considers it as one of the important attributes along with northward spit growth for inlet migration/closure/opening. © 2017 Taylor & Francis Group, LLC
Assessing wetland ecosystem services and poverty interlinkages: A general framework and case study [Evaluation des liens entre services écosystémiques des zones humides et pauvreté: Cadre généralet étude de cas]
Kumar R.,Wetlands International South Asia |
Horwitz P.,Edith Cowan University |
Milton R.G.,Natural Resources Canada |
Sellamuttu S.S.,International Water Management Institute IWMI |
And 5 more authors.
Hydrological Sciences Journal | Year: 2011
The wise use of wetlands is expected to contribute to ecological integrity, as well as to secure livelihoods, especially of communities dependent on their ecosystem services for sustenance. This paper provides a conceptual framework capable of examining the goals of wetland management, poverty reduction and sustainable livelihoods. The framework highlights ecological character as a social construct and, with the notion of wetlands as settings for human well-being, builds a concept for assessing the inter-linkages between ecosystem services and livelihoods. The value and broader applicability of our framework is then tested by applying it to a case study from India (Lake Chilika) to evaluate the degree to which the mutual goals of improving both human well-being and the ecological character of wetlands have been achieved. The case study maps changes in human well-being induced in the basin communities due to external vulnerability contexts, institutions and freedoms. It further assesses the response strategies in terms of their impacts on ecological character and poverty status. © 2011 Copyright 2011 IAHS Press.
Mohaptra A.,Fakir Mohan University |
Mohanty S.K.,Chilika Development Authority |
Mohanty R.K.,Water Management
Indian Journal of Marine Sciences | Year: 2011
Study was carried out on the juvenile abundance and post-larval incursion of two species of Scylla into the lagoon for period of two years from August, 2005-July, 2007. Occurrence of juvenile, S. serrata were throughout the year, while in S. tranquebarica, juveniles were not encountered during December-February. December-May register higher median CPUE values with peak in March for S. serrata. In S. tranquebarica, the peak juvenile abundance period was restricted to June- September with peak in July. The CPUE values for juveniles indicted that the recruitment was intense for S. serrata during post-winter (January-April) and for S. tranquebarica during monsoon (June-September). The crab seeds were available throughout the year which gave a clear evidence for the year round recruitment with the peak during the months of November-March for Scylla species from the Bay of Bengal to the Chilika lagoon. During the study period, the megalopa and first crab instar recruitment per net-hour collection was significantly higher during spring tides than neap tide phase (p< 0.05) and also higher incursion was observed in the night hours than day hours (p< 0.05). Significantly higher night collections of mud crab juveniles (mixed population of both species) from net box traps (khandas) were obtained during new moon phases (t=3.88; d.f.=11; P< 0.01).
Mahanty M.M.,National Institute of Ocean Technology |
Mohanty P.K.,Berhampur University |
Pattnaik A.K.,Chilika Development Authority |
Panda U.S.,Campus Management |
And 2 more authors.
Continental Shelf Research | Year: 2016
This paper investigated the hydrodynamics, spatio-temporal variability of temperature/salinity and the residence time of tracer concentrations in a largest brackish water coastal lagoon in Asia, namely the Chilika lagoon, India. An integrated approach combined the measurement and 2D hydrodynamic-advection/dispersion model is used to simulate circulation and temperature/salinity, and estimated the water residence time in lagoon under different forcing mechanisms, such as tide, wind and freshwater discharge during the dry and wet periods. Water circulation inside the lagoon is simulated when wind is included with the tide only forcing during dry period, and freshwater influx is included with the tide and wind forcing during wet period. Under the realistic forcing conditions, the computed temporal variability of water temperature and salinity are well correlated with the measurements in both the periods. The spatial variations of water temperature within the lagoon is influenced by the meteorological conditions, tide and freshwater influx as well as the shallowness of the lagoon, whereas the salinity is spatially controlled by the freshwater influx from the riverine system and seawater intrusion through the tidal inlets. The numerical model results show that in the Chilika lagoon tidal and river influx affect significantly the residence time spatially, and is site specific. The residence time varies from values of 4–5 days in the outer channel (OC) and 132 days at the northern sector (NS) in the main body of lagoon. The current study represents a first attempt to use a combined model approach, which is therefore, a useful tool to support the ecological implication of the lagoon ecosystem. © 2016 Elsevier Ltd
Sahoo R.K.,Berhampur University |
Mohanty P.K.,Berhampur University |
Samal R.N.,Chilika Development Authority
Indian Journal of Geo-Marine Sciences | Year: 2016
Inlet hydraulics of Chilika Lagoon is studied using various observed inlet parameters (tide, current and morphology) and computing parameters such as hydraulic radius, inlet impedance, King’s inlet frequency and friction, maximum channel velocity, phase lag and repletion coefficient during 2009 for spring and neap tide conditions. It is revealed that maximum water level variation in the lagoon occurs during May and is associated with wind –tide interaction in the absence of freshwater discharge. Results indicate ebb dominance of inlet during wet period (July to December) and flood dominance during dry period (February to May) of the lagoon. Period of maximum ebb current (July) coincides with the period of maximum fresh water discharge while period of maximum flood current (May) coincides with the period of maximum momentum input and percentage of sea distribution. Ebb dominance of the inlet is also revealed through computation and analysis of hydraulic parameters, primarily repletion values. Keeping in view the role of inlet hydraulics on the cotemporary phase of lagoon transformation, integration of inlet management into the overall ecosystem management of the lagoon is suggested. © 2016, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.
Jayasankar P.,Indian Central Institute of Freshwater Aquaculture |
Patel A.,Indian Central Institute of Freshwater Aquaculture |
Khan M.,Chilika Development Authority |
Das P.,Indian Central Institute of Freshwater Aquaculture |
Panda S.,Nandankanan Biological Park
Molecular Biology Reports | Year: 2011
Of the only known two Lagoon populations of Irrawaddy dolphins (Orcaella) in the world, one is residing in the Chilika Lagoon in Orissa state, India. In addition to accidental deaths in gill net fishery and mechanized boat operations, there has been exploitation of the species for their oil. Extreme patchy distribution and vulnerability to becoming entangled in fishing gear has made it a focus of conservation concern. Information on genetic diversity of populations has considerable potential for informing conservation plans. The present paper reports the first genetic study of O. brevirostris from Chilika Lagoon based on mtDNA sequencing and PCR-based sex identification from 11 individuals. Control region sequence comparison showed two haplotypes and cytochrome b a single haplotype in the Chilika population of the species. Phylogenetic analysis indicated distinct clades within the Asian samples, with the Indian population showing closest genetic proximity to the haplotypes from Thailand. Sex of the animal was determined by PCR-based method. It is important to continue to examine the population discreteness and genetic variation of Irrawaddy dolphin in Chilika Lagoon vis-à-vis its global geographic distribution for formulating the conservation plans of the species. © 2010 Springer Science+Business Media B.V.
Sahoo D.,Chilika Development Authority |
Panda S.,Chilika Development Authority |
Guru B.C.,Utkal University
Journal of the Marine Biological Association of the United Kingdom | Year: 2011
Portunus pelagicus a commercially important crab species found in Chilika lagoon constitutes about 20% of the total crab production. The carapace width (CW) ranges from 4.5-10.5cm in both the sexes during the study period. The maximum abundance of male was at 6.6 to 7.5cm CW whereas the females predominate from 6.6 to 9.5cm CW. The relationship between carapace length (CL) and CW is linear in both sexes which indicates isometric growth. However, the relationship between CL, CW with total body weight (TW) is exponential. The food habit from gut content analysis shows that the species is highly carnivorous and the main food items include prawn carapace and appendages (27.58%), molluscan remaining (21.55%), fish bone (7.75%), seagrass (1.72%), unidentified materials (4.31%) and the mixed food (37.06%). The feeding index was found highest (80.95%) in February whereas it is lowest (60.9%) in June. The mature females are observed from May to July with a peak in July in the lagoon. The highest gonadosomatic index is found in July with an average CW of 10.5cm. No berried females are found in the study period, which indicates that it did not spawn inside the lagoon and migrates to the sea during the rainy season. © Marine Biological Association of the United Kingdom 2010.
Akamatsu T.,Japan National Research Institute of Fisheries Engineering |
Akamatsu T.,Japan Science and Technology Agency |
Ura T.,Tokyo University of Science |
Sugimatsu H.,Tokyo University of Science |
And 8 more authors.
Journal of the Acoustical Society of America | Year: 2013
Abundance estimation of marine mammals requires matching of detection of an animal or a group of animal by two independent means. A multimodal detection model using visual and acoustic cues (surfacing and phonation) that enables abundance estimation of dolphins is proposed. The method does not require a specific time window to match the cues of both means for applying mark-recapture method. The proposed model was evaluated using data obtained in field observations of Ganges River dolphins and Irrawaddy dolphins, as examples of dispersed and condensed distributions of animals, respectively. The acoustic detection probability was approximately 80%, 20% higher than that of visual detection for both species, regardless of the distribution of the animals in present study sites. The abundance estimates of Ganges River dolphins and Irrawaddy dolphins fairly agreed with the numbers reported in previous monitoring studies. The single animal detection probability was smaller than that of larger cluster size, as predicted by the model and confirmed by field data. However, dense groups of Irrawaddy dolphins showed difference in cluster sizes observed by visual and acoustic methods. Lower detection probability of single clusters of this species seemed to be caused by the clumped distribution of this species. © 2013 Acoustical Society of America.
Ray L.,KIIT University |
Suar M.,KIIT University |
Pattnaik A.K.,Chilika Development Authority |
Raina V.,KIIT University
International Journal of Systematic and Evolutionary Microbiology | Year: 2013
A novel actinobacterial strain, designated RC 1830T, was isolated from the sediment of estuarine coastal brackish water lagoon of Chilika Lake, in Khurdha district of Odisha, India, and characterized using a polyphasic approach. Strain RC 1830T was halophilic and alkali-tolerant and found to hydrolyse chitin, starch, tributyrin, lecithin, Tween 80, cellulose, gelatin and casein. The diagnostic presence of LL-diaminopimelic acid, iso-C15: 0, anteiso-C15: 0, iso-C16: 0, C16: 0, iso-C17: 0, anteiso-C17: 0 as major cellular fatty acids and MK-9(H4 and H6) as major menaquinones noticeably associated the strain to the genus Streptomyces. After comparison and analysis of the near complete 16S rRNA gene sequence with representative strains of other streptomycetes, it was evident that strain RC 1830T belonged to the genus Streptomyces, and exhibited the highest sequence similarities of 99.53 %, 99.25 %, 99.11 %, 99.10% and 99. 06% to Streptomyces fragilis DSM 40044T, Streptomyces coelicoflavus NBRC 15399T, Streptomyces flaveolus NBRC 3715T, Streptomyces lavenduligrisesus NBRC 13405T and Streptomyces eurythermus ATCC 14975T, respectively. Reconstruction of a phylogenetic tree for the genus Streptomyces revealed that strain RC 1830T formed a distinct phyletic line and clustered with its most closely related neighbour S. fragilis DSM 40044T. The DNA-DNA relatedness values between strain RC 1830T and the most closely related type strain S. fragilis DSM 40044T were determined to be 17.7±4.55 %. Additionally, morphological, biochemical and physiological tests were able to distinguish the strain from the most closely related type strain S. fragilis DSM 40044T and other closely related neighbours, S. coelicoflavus DSM 41471T and Streptomyces flaveolus DSM 40061T. Based on a range of phenotypic and genotypic properties, strain RC 1830T is suggested to represent a novel species of the genus Streptomyces for which the name Streptomyces chilikensis sp. nov. is proposed. The type strain is RC 1830T (=JCM 18411T=DSM 42072T). © 2013 IUMS.
Ray L.,KIIT University |
Mishra S.R.,KIIT University |
Panda A.N.,KIIT University |
Rastogi G.,Chilika Development Authority |
And 4 more authors.
International Journal of Systematic and Evolutionary Microbiology | Year: 2014
The taxonomic position of a novel actinomycete, strain RC 1831T, isolated from the sediment of a fish dumping yard at Barkul village near Chilika Lake, Odisha, India, was determined by a polyphasic approach. Based on morphological and chemotaxonomic characteristics the isolate was determined to belong to the genus Streptomyces. The phylogenetic tree based on its nearly complete 16S rRNA gene sequence (1428 nt) with representative strains showed that the strain consistently falls into a distinct phyletic line together with Streptomyces glaucosporus DSM 41689T (98.22% similarity) and a subclade consisting of Streptomyces atacamensis DSM 42065T (98.40 %), Streptomyces radiopugnans R97 DSM 41901T (98.27 %), Streptomyces fenghuangensis GIMN4.003T (98.33 %), Streptomyces nanhaiensis DSM 41926T (98.13 %), Streptomyces megasporus NBRC 14749T (97.37 %) and Streptomyces macrosporus NBRC 14748T (98.22 %). However, the levels of DNA-DNA relatedness between strain RC 1831T and phylogenetically related strains Streptomyces atacamensis DSM 42065T (28.75±3.25 %) and Streptomyces glaucosporus DSM 41689T (15±2.40 %) were significantly lower than the 70% threshold value for delineation of genomic species. Furthermore, the isolate could be distinguished phenotypically on the basis of physiological, morphological and biochemical differences from its closest phylogenetic neighbours and other related reference strains. Strain RC 1831T is therefore considered to represent a novel species of the genus Streptomyces, for which the name Streptomyces barkulensis sp. nov. is proposed. The type strain is RC 1831T (=JCM 18754T=DSM 42082T). © 2014 IUMS.