The study was carried out to determine the natural regeneration of four species of mangroves along with estimation of physico-chemical characteristics of sediment and water from seven sites of mangroves in the southern Gulf of Kachchh. Spatial variation of different parameters of water and sediment investigated were: water-pH (7.87–8.04); Salinity (37.07–39.42 ppt); Nitrate (1.21–2.71 ppm); Nitrite (0.03–0.08 ppm); Phosphate (0.39–0.95 ppm) and sediment-pH (7.39–7.61); Bulk density (0.36–0.54 g/cc); Particle density (1.19–1.68 g/cc); Organic carbon (0.77–1.05%); and Organic matter (1.06–1.71%). The density (recruit/sq. m) of natural recruitment of four mangrove species was in order of Avicennia marina > Ceriops tagal > Aegiceras corniculatum > Rhizophora mucronata. Cluster analysis grouped seven sites in three major clusters i.e. Group A (Poshitra & Khijadiya - 91% similarity); Group B (Dedeka-Mundeka, Kalubhar & Pirotan- 94% similarity) and Group C (Sikka & Jodiya- 93% similarity) whereas Non-metric multidimensional scaling showed formation of two groups (Coastal and Islands) depending on the environmental conditions and mangrove natural regeneration. Principal component analysis showed the number of parameters such as salinity, texture and organic carbon which affects the natural regeneration of mangrove species in the study area.
ABSTRACT-Floristic inventory and diversity assessment are necessary to understand the present diversity status of the conservation of biodiversity. Shorelines are one of the most rapidly changing places on the Earth. The Gulf of Kachchh (GoK) is a semi-enclosed coastal indentation with predominance of mangrove ecosystems, coral reefs, associated rich marine diversity and coastal terrestrial vegetation. Halophytes are flowering plants, which are naturally found in saline habitats such as coastal swamps, coastal dunes, inland salt flats etc. Present works reveals the diversity of halophytes in GoK. Total 27 halophytes were encountered from 13 coastal talukas and islands of GoK. Islands of GoK, and Bhachau taluka are the area with highest diversity in GoK. In the present study α diversity (Shannon diversity index, Simpson's Index, species richness, evenness index) of the halophyte community was studied. From the study of biodiversity it was observed that highest species diversity (Shannon-Wiener diversity H') was observed in Jamnagar district and its islands whereas species richness index (d) was highest in Devbhumi Dwarka district and its islands. Evenness index (e) was highest (0.528) in Morbi district.
Compared to other taxons of crustacea, limited literature is available on the diversity of Infraclass Cirripedia (Barnacles), as they are not much studied from the taxonomical point of view. The present study describes a total of 7 species of Intertidal cirripedia from Gujarat coast which includes the actual study and review. The highest species diversity was recorded from the Saurashtra coast bearing rocky intertidal areas, the highly supportive habitat for their attachment. The most common species observed were Tetraclita squamosa rufotincta, Amphibalanus amphitrite, Chthamalus stellatus and Balanus crenatus found flourishing on rocky shore with high density.
Phytoplanktons are the primary producer of marine ecosystems and contribute towards the primary productivity of aquatic environment. The present study was carried out at three selected sites of Gulf of Kachchh (GoK) viz; Pirotan, Sachana and Roziport. During the study, a total of 106 species of phytoplankton were recorded, of which the highest species diversity was found at Rozi followed by Pirotan and Sachana. The maximum number of species diversity was contributed by the class Bacillariophyceae with 81.5 percentage , 79 percentage and 83 percentage at Pirotan, Rozi and Sachana, respectively. Rozi port reported the highest number of harmful phytoplankton i.e. some members of Bacillariophyceae and Dinophyceae. The highest number of species was recorded at Rozi port (75 sp.) followed by Pirotan (54 sp.) and Sachana (46 sp.). The varied environmental conditions prevailing at three study sites may cause variation in species composition at these sites.
he present study deals with the congregation of avifauna at various locations in Gulf of Kachchh (GoK), Gujarat, India. The study was conducted between 2011 and 2014. A total of 14 sites were identified in Gulf of Kachchh which had regular and remarkable congregation of mono-species or multi-species of waterbirds. The observations were made through line transects and point count sampling methods. The largest congregation sites were Bhaidar and Pirotan Islands with more than 5,000 individuals of waterbirds. Khijadiya wetland was also recorded with a remarkable number of birds in the congregation, i.e., more than 4,000 individuals. The identified congregation sites were found to be distributed throughout the southern part of GoK. Such sites were intertidal areas, freshwater bodies, saltpans etc. The bird congregations comprised resident and migratory waterbirds and coastal birds.
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