Zooplankton community structure in the nearshore waters of central west coast of India (original) (raw)
Related papers
Journal of the Marine Biological Association of India
The study focused on the variations in seasonal diversity of zooplankton between the polluted coastal environments of Mumbai and the comparatively less polluted coastal waters of Ratnagiri. The study was carried out from August 2014 to May 2017. Zooplankton was collected from hauls at 20 m and 40 m depth contours off Mumbai and Ratnagiri coast. The results indicated that Species Richness d, Shannon H and Simpson 1-λ at Mumbai stations were low compared to Ratnagiri stations. The values were higher in post-monsoon (POM) and pre-monsoon (PRM) than in monsoon (MON) season. Two-way ANOVA revealed a significant difference (P<0.05) for values of 'd', 'H' and 1-λ' between Mumbai and Ratnagiri. Post-Hoc Tukey test showed a significant difference (P<0.05) between values of 'd', 'H' and 1-λ' during MON and POM, MON and PRM. However, no significant difference (P>0.05) was observed between POM and PRM. Cluster analysis showed a 35% similarity in diversity between MON and the other two seasons. SIMPER analysis of similarity showed average dissimilarity of 44.77 between the diversity of Mumbai and Ratnagiri. The study indicated seasonal variations in the zooplankton diversity in coastal regions of Mumbai and Ratnagiri. The impact of pollution and anthropogenic activities could have reduced zooplankton diversity and abundance in the coastal environment of Mumbai compared to the less polluted waters of Ratnagiri.
A quantitative study on the abundance and diversity of zooplankton and its seasonal variation in the water of SahebBandh, Purulia, the only source of drinking water in Purulia town, has been done. Four major groups of zooplanktons, viz. Rotifera, Copepoda, Cladocera and Ostracoda have been identified in the water. Bio- diversity indices have been used to monitor the community composition of the zooplanktons and environmental standards or quality of the environment of Saheb Bandh. Five indices, viz., Shannon-Wiener diversity index (ψ), Index of species richness (μ), Index of dominance (η), Evenness index (ε) and Sorensen’s index of similarity (θS) are employed and estimated in the present investigation. Seasonal variation of these indices has been studied.
Zooplankton abundance and its seasonal distribution at Patalganga estuary, Maharashtra, India
Patalganga-Amba estuarine ecosystem is one of the productive ecosystems in Maharashtra. The fishermen community near the estuarine ecosystem is fully or partially depending on the ecosystem for their livelihood. But the increasing anthropogenic stress on the ecosystem is adversely affecting the ecosystems functions and services. On this background we studied the zooplankton abundance and seasonal distribution in relation with hydrological parameters. All the water quality parameters assessed were showing spatial and temporal variations. 14 groups of zooplankton were identified with a density ranges from 6162 and 181155 no. x 10 3 /L. Copepods and copepod Nauplius were dominant followed by Balanus, Nauplius and foraminifera. The numerical density of zooplankton was positively correlated with phytoplankton abundance, temperature, pH and negatively correlated with salinity. Shannon-Weiner diversity index (H') based on zooplankton abundance ranged between 2.25 to 2.26 (av. 2.25), Simpsons's index (J') recorded was 0.874 and Margalef 's (D) was 1.25. The diversity indices were indicating the ecosystem is productive but declining gradually while comparing with the previous studies.
Influence of environmental parameters in phyto and zooplankton assemblages in the Tamil Na 1 1
Phytoplankton and zooplankton were sampled in Chennai and Parangipettai coast, south-western part of Bay of Bengal (BoB) at monthly scale from August 2013 to July 2014. Physico-chemical parameters such as sea surface temperature (SST), pH, salinity, Dissolved Oxygen (DO), Total Suspended Solids (TSS), Light Extinction Coefficient (LEC), nitrate, ammonia, inorganic phosphate and silicate expressed marked seasonal characteristics and statistically significant (P < 0.0005) influencing seasonal variability in population density of phyto and zooplankton by controlling their growth rate and abundance. A total of 124 phytoplankton species were recorded, of which 81 species belongs to diatoms, 36 species of dinoflagellates and 7 species blue green algae. On the other hand, 110 species of zooplankton were identified, belonging to 82 genera, 63 families and 30 orders in which copepods were the largest contributors, comprising of 54 species. In common, sites close to shore observed with high richness index when compared to offshore region which recorded with high diversity index. However, density of the plankton not showed discernible spatial variation but showed seasonal variation. Redundancy Data Analysis (RDA) expressed that the speciesenvironment relations from first two axes among the different seasons was varied from 41.7 % to 49.9 % for phytoplankton and from 33.5 % to 66.7 % for zooplankton, registering maximum during pre-monsoon.
A study pertaining to the seasonal variation in physicochemical characteristics and its ecological relationship with zooplankton community structure of muttukadu backwater was carried out for a period of one year between October 2017 and September 2018. Samples were collected from different salinities such as backwater and marine coastal waters at three different locations viz., station 1 and 3 from brackish region and station 2 from lagoon region. Physicochemical parameters such as atmospheric temperature, surface water temperature, salinity, dissolved oxygen, chlorophyll-a, turbidity, alkalinity, hardness and inorganic nutrients. The environmental condition in the coastal waters was almost similar to the estuarine region except the salinity. A total of 41 different taxonomic groups of zooplankton were identified under 10 different orders namely, Amphipoda (2), Anomopoda (2) Calanoida (14) Canuelloida (1) Cyclopoida (4) Copelata (1) Harpacticoida (7) Myodocopida (1) Plioma (4) and Tanaidacea (1) Others (4). The density of zooplankton was very high during pre-monsoon and monsoon at the brackish and coastal waters due to optimum level of nutrients and the availability of food. On spatial scale, zooplankton density and biomass were found to be relatively higher at the lagoon water mainly attributed to the abundance of Dioithonarigida, oithonasimilis and Brachionusplicatilis. In contrast, zooplankton diversity was relatively higher in the coastal waters of the study area 3 than the brackish water and lagoon region.
Marine Environmental Research, 2006
Zooplankton species distribution and abundance data at 17 locations in the inshore (10-30 m), shelf (50-200 m) and oceanic (2500-2800 m) regions off northeast India (Bay of Bengal) during January 1999-April 2001 revealed 112 taxa represented by 30 divergent groups. Copepods (58 species) dominated (87%) the population numerically. In general zooplankton diversity (Margalef richness d, Shannon-Wiener H 0 , PielouÕs evenness J 0) increased in the direction of the open sea relative to coastal locations with a concomitant decrease both in abundance (ind m À3) and biomass (dry mass m À3). Based on multivariate analyses, it was possible to distinguish the zooplankton community into different assemblages according to their location (e.g., inshore, shelf, oceanic) and seasonality. While Acrocalanus sp., Oithona sp., Corycaeus danae, Euterpina acutifrons, Paracalanus sp., and Acartia sp. were found characterizing the coastal locations, Oncaea venusta was the discriminating species for shelf waters. In oceanic areas, there was a clear dominance of Labidocera sp., Candacia sp., Euchaeta rimana, Centropages calaninus, Copilia mirabilis and Corycella gibbula. The investigations revealed that changes in zooplankton community structure across water bodies could be associated with differing salinity. During November 1999 (post-monsoon), when salinity in the coastal waters was relatively low (26-28.9 PSU), the zooplankton community consisted of mainly Acrocalanus sp., Salpa, Corycaeus danae, Oikopleura sp., Acartia sp., Evadne tergestina, and Creseis
The population densities of four major zooplankton groups (Rotifera, Cladocera, Copepoda and Ostracoda) present in Sahebbandh showed significant differences (p<0.01) between different months within a year. Significant differences were also observed (p<0.01) for ten physicochemical parameters (water temperature, water transparency, pH, dissolved oxygen content, free carbon dioxide content, ammonia content, chloride concentration, sulphate concentration, nitrate concentration and phosphate concentration) with respect to the months of a year in Sahebbandh. Correlation between zooplankton population densities and physicochemical parameters has been studied calculating the Pearson correlation coefficients. Rotifera population density exhibited significant positive correlations with Ammonia content, nitrate concentration and sulphate concentration in lake water. Cladocera population density showed significant positive correlation with water temperature. Copepoda population density e...
Journal of entomology and zoology studies, 2020
The present investigation deals with the assessment of diversity, composition and seasonal distribution of zooplankton in the nearshore waters of Gulf of Mannar. The present study consists of 35 species at three different sampling stations. In this investigation, maximum zooplankton species were recorded at station 1 and 3, i.e., Mandapam and Punnakayal. Decapods and Calanoids were the most dominant groups. The species diversity of zooplankton was comparatively more at station 1 as compared to station 2 and 3 whereas the density of zooplankton was found to be lower at station 1 (542 to 33, 519 nos. m-3) compared to station 2 (821 to 41, 624 nos. m-3) and station 3 (761 to 39, 648 nos. m-3). The maximum and minimum density were recorded during summer 2018 and post-monsoon 2018 respectively at all sampling stations. The species diversity index (‘H’) was highest at station 1 (1.55) and (1.55) and lowest at station 3 (1.10). The current investigation exhibited that the rich zooplankton ...
Zooplankton abundance and its seasonal distribution in Patalganga estuary, Maharashtra, India
2019
Patalganga-Amba estuarine ecosystem is opening to the southern part of Mumbai harbour, Raigad district of Maharashtra. Since it is one of the most productive and diverse ecosystem, the fishermen community belonging in this area are getting full or partial advantages of estuarine functions and services. There are more than 13 number of industries along the head water of Patalganga River, hydroelectric power station, Karanja boat jetty etc. are adversely affecting and making this ecosystem vulnerable to ecosystem degradation, eutrophication and decline of species abundance. On this background we studied the zooplankton abundance and seasonal distribution in relation with hydrological parameters, which are showing spatial and temporal variations. There were 14 groups of zooplankton identified with a density ranges from 6162 and 181155 no.x 103 L-1. Copepods and copepod nauplius were dominant followed by barnacle nauplius and foraminifera. The numerical density of zooplankton was positi...
Chinese Journal of Oceanology and Limnology, 2016
Keibul Lamjao National Park (KLNP), a fl oating park in Loktak Lake, Manipur (India) was studied from Winter (WIN) to Post Monsoon (POM) for its zooplankton composition and some selected water parameters. The resultant data were subjected to multivariate techniques Principal Component Analysis (PCA) and Canonical Correspondence Analysis (CCA). Analyses of water parameters with PCA revealed that the fi rst PC axis (PC1) accounts for maximum variance in the seasonal data, explaining a variability of 91%. The PCA revealed that the seasonal variability in water parameters was due to the wet and dry cycle of seasons and the stations were distinguished on the basis of transparency and turbidity. Zooplankton abundance was dominated by copepods followed by cladocerans. Temporally, abundance of copepods reached a maximum during Post-monsoon (POM) (3 880 ind./L). Spatially, S6 was found to be most abundant of the other stations in zooplankton. Copepodites and nauplii larvae were the major components of zooplankton. The Rotifera were the least abundant among the three zooplankton groups. Brachionus formed the major component of Rotifera zooplankton at all the stations during the study period. In the Cladocera, Macrothrix was present during all the four seasons, while Pleuroxus , Oxyurella , Kurzia and, Diaphanosoma were rare. The CCA shows that maximal temporal variability in zooplankton abundance was explained by temperature and rainfall. ANOVA revealed no signifi cant diff erence in mean zooplankton abundance among the seasons, but there was a statistically signifi cant diff erence among the sites.