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3 documents found tagged mangroves [X]
  • Title
    Heavy metal distribution in mangrove sediment cores from selected sites along western coast of India
    Type
    Journal Article
    Description
    Sediment cores were collected from four different mangrove areas of northern Kerala and southern Karnataka, western coast of India. The cores were analysed for the concentration of five heavy metals (Pb, Ni, Zn, Cu Fe) using Atomic Absorption Spectrometry. The levels of heavy metals in the present study from all the four sediment cores were in the order Fe > Pb > Zn > Ni > Cu and the mean concentrations of each elements in different cores were comparable. According to Sediment Quality Guidelines (SQG), the mangrove sediments analysed here were moderately contaminated with Ni and heavily contaminated with Pb. The increased concentration of Ni and Pb in the sediments might be due to their atmospheric deposition or water discharge from different far away sources since the areas selected for study were not disturbed by direct anthropogenic impacts. Elevated levels of Fe which is considered to be a common phenomenon in mangrove sediments have also been found in the present study. Heavy metal levels in sediments showed statistically significant correlations with pH, calcium carbonate and organic matter. This suggests the influence of physico-chemical parameters on the adsorption, deposition and persistence of heavy metals in mangrove sediments. The heavy metal concentration and the pollution status of the mangroves of west coast, especially the areas selected in this work are less studied before. Hence the data provide from the present baseline study would be further helpful in remediation and management of mangrove ecosystem.
    Attribution
    P. Vidya & Rajashekhar K. Patil, Journal of Threatened Taxa, Vol 8, No 11 (2016); pp. 9356–9364 http://dx.doi.org/10.11609/jott.1978.8.11.9356-9364
  • Title
    A preliminary study on the birds of Thane Creek, Maharashtra, India
    Type
    Journal Article
    Description
    Shorebirds also known as waders comprise several adaptations, which enable them to forage on exposed mudflats. The population of birds in any ecosystem shows the environmental quality of the area, pollution level, security and availability of food and habitat. Thane Creek located in Mumbai is one of the unique mangrove ecosystems, maintaining a good population of sediment-dwelling organisms that support a myriad of migratory and non-migratory bird populations. Bird surveys were carried out using the point count method across two different locations at Thane Creek. In total 95 species of birds were recorded during the study and distinguished as per the pattern of their foraging. A healthy diversity of bird species observed indicates the high productivity of the creek.
    Attribution
    Sheetal Chaudhari-Pachpande & Madhuri K. Pejaver, Journal of Threatened Taxa, Vol 8, No 5 (2016); pp. 8797–8803 http://dx.doi.org/10.11609/jott.2397.8.5.8797-8803
  • Title
    Mangrove sediment core analysis of foraminiferal assemblages - a study at two sites along the western coast of India
    Type
    Journal Article
    Description
    Mangroves are an unique habitat and are largely influenced by sea level changes and wave energy. Foraminifera (Protista) preserved in mangrove sediments provide an excellent proxy for deducing past conditions. One meter deep mangrove core samples at two sites on the western coast of India were collected. The foraminiferal assemblages at various depths showed significant changes in the abundance and diversity down the cores. A total of 59 species belonging to 32 genera, 24 families and five suborders were identified from the cores of these two sites. The cores showed an abundance of genus Rotalidium particularly the species Rotalidium annectans. Other species identified include Ammonia, Elphidium, Nonion, Spiroloculina, Quinqueloculina, Globigerinoides, etc. The pH, organic matter and CaCO3 also showed variations down the cores. There was a lack of correlation between sediment characteristics and the abundance of foraminifera in the cores. The low diversity and differences in distribution of foraminifera compared to surface intertidal samples may be due to intense post depositional changes or anthropogenic disturbances. The mangrove ecology thus appears disturbed by various factors.
    Attribution
    Vidya P., Patil R.K. (2014). Journal of Threatened Taxa 2(6) pp. 5485-5491; doi:10.11609/JoTT.o3653.5485-91