Diurnal variation in physical-chemical properties and primary production in the interconnected marine,mangrove and freshwater biotopes of Kakinada coast,Andhra Pradesh,India |
| |
Authors: | V Selvam Jayapaul Azariah Hilda Azariah |
| |
Institution: | (1) Department of Zoology, University of Madras, Guindy Campus, 600 025 Madras, India;(2) CAS in Botany, University of Madras, Guindy Campus, 600 025 Madras, India |
| |
Abstract: | Diurnal variation in hydrological variables and dissolved inorganic nutrients such as PO
inf4
sup3–
-P, N O
inf2
sup–
-N, NO
inf3
sup–
-N and NH
inf4
sup+
-N were studied in three interconnected biotopes including freshwater, marine and mangrove brackish water of the Kakinada coastal zone, Andhra Pradesh. Samples were collected at intervals of 3 hours, for a period of 24 hours. In the marine environment salinity varied from 26 to 32 whereas in the mangrove waters it fluctuated from 12 to 20 and in both biotopes salinity showed bimodal type of oscillation. Dissolved oxygen content was high in the mangrove waters during day time but decreased rapidly during the night hours. In the marine environment POf4
p3–-P concentration varied from 0.345 to 1.195 g at l–1, NO
inf3
sup–
-N from 1.03 to 6.62 g at l–1 and NO
inf2
sup–
-N from 0.086 to 0.506 g at l–1. The highest and the lowest concentrations of PO
inf4
sup3–
-P, NO
inf3
sup–
-N, NO
inf2
sup–
-N recorded in the mangrove waters were 0.790 and 0.325 g at l–1, 7.10 and 1.60 g at l–1 and 0.278 and 0.060 g at l–1, respectively. The concentration of PO
inf4
sup3–
-P, NO
inf3
sup–
-N and NO
inf2
sup–
-N were high in the freshwater canal, the maximum and minimum values being 1.110 and 0.730 g at l–1, 26.40 and 9.98 g at l–1 and 0.520 and 0.252 g at l–1 respectively. The concentration of ammonia was relatively high in the mangrove water. Gross and net primary production in the mangrove water was 4 times higher than in the marine biotope. There was no export of dissolved nutrients from the mangrove environment to the adjacent marine waters. |
| |
Keywords: | Diurnal variation mangrove water dissolved inorganic nutrients primary production |
本文献已被 SpringerLink 等数据库收录! |
|