Effect of insolation and overhead canopy on macrozoobenthos of tropical freshwater ponds |
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Authors: | Mousumi Roy N C Nandi |
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Institution: | 1.Zoological Survey of India,New Alipore, Kolkata,India;2.Department of Zoology,Kishore Bharati Bhagini Nivedita College,Behala, Kolkata,India |
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Abstract: | Distribution and abundance of macrozoobenthic species were investigated in open and shaded sites of tropical freshwater pond
ecosystems in Kolkata. Water temperature of open sites was higher than the shaded sites but transparency value was lower at
the lighted sites presumably related with the production of phytoplankton in the presence of sunlight. Diversity of species
was recorded highest (26 species) along with total benthos density (5999 no/m2) at slightly illuminated open site. Mean biomass was also highest at the slightly illuminated open site. Total benthos density
of macrozoobenthos was lower at the fully shaded and fully lighted sites. The greater occurrence and abundance of most macrozoobenthic
species-including total benthos density and biomass at the slightly illuminated open site was probably associated with microhabitat
suitability supported by moderate presence of macrophytes. Higher quality food (algae and algal detritus) and thermal suitability
as well as phototactic attraction of motile epibenthic gastropods and other organisms contribute to the greater abundance
and production of biomass at this site. |
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