the The present study was conducted at two identical sites of Sikka coast namely DCC (Digvijay Cement Company) jetty area and the GSFC (Gujarat State Fertilizer and Chemicals Limited) jetty area October 2020 to March 2021.The observation were at from s recorded monthly interval for the abundance of crustacean species.In total 13 crustacean species were identified of 13 genera and 11 families, s including 9 brachyuran crabs, 2 shrimps, 1 porcelain crab and 1 barnacle.Nine genera, eight families, and nine species of brachyuran crabs were recorded.Shrimps encountered with two families, two genera, and two species.Presence of a common mangrove, is a Avicenna marina, good sign as it of ment barnacle ( ).The GSFC jetty area recorded the highest number of provides sites attach to the Amphibalanus Amphitrite species during December and lowest was October.In DCC area, the number of species were in March and the number in in highest fewest October.and (Uca crab) were the most common species of family Grapsidae and Ocypodidae, Metapograpsus thukuhar Austruca iranica respectively.
The study was carried out in the Ottu reservoir in Sirsa city of Haryana, India. Evaluation and quantification of phytoplankton of the Ottu reservoir were monitored from March 2021 to June 2021. The evaluation of the phytoplanktonic population revealed that there 19 genera of phytoplankton belong to class Bacillariophyceae (3 genera), Cyanophyceae (3 genera), Chlorophyceae (11 genera), Euglenophyceae (2 genera) In various months maximum, 123 species of phytoplankton were observed in site two and site 4, and Chlorophyceae found the as dominant group. The highest quantity of phytoplankton was observed in site two, while the minimum quantity was observed in site 3. Shannon and Weaver's diversity index for phytoplankton was found to be maximum in site 1(2.78) and minimum in site 4 (2.05). In site 1 and site 2 significant difference (p
The Indian river system is a vast and complex network of rivers and their tributaries that crisscross the entire country. It plays a crucial role in India's geography, culture, economy, and ecology. The sources of rivers are diverse, including glaciers, mountains, and precipitation. These rivers traverse a variety of terrains, spanning from the snow-covered Himalayas in the northern region to the peninsular plateaus in the southern region. Within the country, there are 14 significant rivers (with a catchment area exceeding 20,000 km²), 44 moderate rivers (with a catchment area ranging from 2,000 to 20,000 km²), and countless minor rivers (with a catchment area less than 2,000 km²). The Indian riverine system can be broadly categorized into two main groups: Himalayan Rivers, encompassing significant waterways like the Indus, the Ganges, and the Brahmaputra, along with their tributaries; and the Peninsular Rivers, divided into the East Coast (Mahanadi, Krishna, Godavari, Cauvery) and West Coast (Narmada and Tapti) rivers, Apart from these major rivers, India is also home to numerous other rivers, both big and small, which contribute to the diverse ecology and livelihoods of people living along their banks. The rivers of India host incredibly varied fish communities, supporting the sustenance and livelihoods of millions of individuals, particularly in rural regions. There are 999 freshwater species of fish in India, out of a total of 2801 species. However, the Indian river system faces various challenges, including pollution, over-extraction of water, encroachments, and climate change impacts. Conservation and sustainable management efforts are essential to safeguard these vital water bodies and ensure their well-being for future generations.
The study aims to examine the relationship between physicochemical parameters and the diversity of Brachyuran crabs in the Gulf of Kachchh, Gujarat, from November 2020 to April 2021. The research was conducted at two locations, Vador and GSFC (Gujarat State Fertilizer & Chemical Limited) Jetty near Sikka on the southern coast of the Gulf of Kachchh, using the quadrat method for sampling. Various species diversity indices and attributes were calculated, such as species diversity, richness, species evenness, density, abundance, and frequency. A total of 31 Brachyuran crabs belonging to 26 genera and 14 families were recorded, with 26 and 18 species reported from Vador and GSFC Jetty sites, respectively. The Portunidae family had the highest number of species, followed by the Xanthidae family. Brachyuran crab species were found in habitats including rocky areas, muddy areas, mangroves, sponge-associated areas, seaweed-associated areas, and coral reef-associated areas. During the study period, Thalamita crenata showed the highest average density (no/m2) and abundance along the Sikka coast. An analysis of physicochemical parameters, including air and water temperature, pH, salinity and dissolved oxygen, revealed positive correlation with temperature and salinity and a negative correlation with dissolved oxygen. These findings provide crucial baseline data that can inform the development of conservation and biodiversity management strategies in this region, emphasizing the importance of protecting coastal ecosystems.
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