A LIMNOLOGICAL STUDY OF PRIMARY PRODUCTIVITY IN SEASONAL VARIATIONS OF A TYPICAL TROPICAL POND OF BUNDELKHAND REGION, INDIA

The primary productivity of the Mahil pond has been estimated from March 2017 to February 2018 at four different stations. Various physicochemical parameters and phytoplankton were studied. The seasonal variation of primary productivity revealed that maximum and minimum values of Gross primary productivity and community respiration were associated with rainy and summer seasons respectively. The minimum values of Net primary productivity were recorded during rainy season and maximum during winterfor different study stations.

Trends in freshwater microcrustaceans studies in Brazil between 1990 and 2014

This study presents a review of scientiometric data about freshwater microcrustaceans (Copepoda, Ostracoda, Branchiopoda: Cladocera, Anostraca, Notostraca and Conchostraca) in Brazil from 1990-2014. This review is based on 179 papers published across four databases, using the following keywords in the search: microcrustaceans, Copepoda, Cyclopoida, Calanoida, Harpacticoida, Ergasilidae, Daphniidae, Moinidae, Cladocera, Ostracoda, Conchostraca, zooplankton, reservoir, river, ponds, reservoirs, wetlands, caves, lakes, limnology, ecology, aquatic, taxonomy, systematics, morphology and biogeography. No studies were identified that addressed freshwater microcrustaceans in four (Amapá, Roraima, Alagoas and Espírito Santo) of the 27 Brazilian Federative States. Forty-five percent of the included studies were concentrated within three of the most populous states (São Paulo, Minas Gerais and Paraná), which also have a long tradition of limnological study. The included studies mostly addressed reservoirs for hydropower generation (22%), multiple environments (22%), rivers (14%) and small artificial reservoirs (11%). Pools, ponds, small lakes, wetlands and phytothelma were not widely studied. Cladocera (48%) and Copepoda (48%) were the most studied groups. No studies were identified that addressed Notostraca, Anostraca or Conchostraca. The sharp increase in the number of published freshwater studies after 2000 is likely a result of increased internet facilities and the implementation of the Scielo platform. Ecology was most frequently the study focus (~50%), followed by taxonomy. Three journals (two Brazilian and one international) accounted for the publication of 44% of the Brazilian studies on microcrustaceans. We expect the frequency of studies employing newer technologies to increase in the coming years. Based on our findings, we propose that future studies should focus on the least well-studied states and should integrate biogeography and systematic approaches. Further data on the fauna within environmental sub-types in Brazil is required.

Recollections and taxo-ecological studies of Coleochaete scutata Bréb., Coleochaete pseudosoluta Gauthier-Lièvre and Coleochaete conchata Möb., West Bengal, India

The present work had been carried out from Hooghly district, West Bengal, India in order to explore species diversity of the taxon Coleochaete Bréb. of the family Coleochaetaceae under the order Chaetophorales belonging to the class Chlorophyceae. There were some structural complexities and variations among the species. A total number of three species namely Coleochaete scutata Bréb., Coleochaete pseudosoluta Gauthier-Lièvre and Coleochaete conchata Möb. were collected and identified first time from this area. They were described with illustrations and some other valuable information. Shape, size and colour of vegetative and reproductive cells or structures were considered as taxonomic parameters for their identifications. Among them, Coleochaete scutata Bréb. was very common while other two species were rare in occurrence in this district. They are all epiphytes on submerged angiospermic plants. Perusal of cited literatures revealed that the above mentioned species were third time reports from West Bengal, India. Limnological study of water analysis showed that water was weakly alkaline and the aquatic ecosystems were oligotrophic and monomictic types.