Unravelling Seasonal Shifts: Exploring Carbon and Nitrogen Stable Isotope Signatures in Zooplankton of Kakinada Bay, Andhra Pradesh, India.
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Abstract
The present study focused on the seasonal variability of carbon and nitrogen stable isotopic signatures in zooplankton collected from Kakinada Bay. Physiochemical parameters of the bay, such as temperature, salinity, nitrates, nitrites, dissolved nutrients, phosphates, and chlorophyll a, were evaluated. The isotopic ratios of carbon and nitrogen in zooplankton and POM were determined using an isotope-ratio mass spectrophotometer. The δ13C values of zooplankton and POM were higher in Kakinada Bay, indicating enrichment of δ13C in primary production. The δ15N values of zooplankton ranged from 8.17 to 9.58, with the highest values observed during the monsoon season. The study provides insights into the trophic structure and anthropogenic influences on the marine ecosystem in Kakinada Bay
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