Sciences marines : recherche et développement

Abstrait

Effect of Physico-Chemical Parameters on Crabs Biodiversity

Varadharajan D, Soundarapandian P and Pushparajan N

If physico-chemical parameters are not suitable, it will affect the distribution of crabs. So, it is designed to know the effect of physico-chemical parameters on the biodiversity of crabs from Arukkattuthurai to Pasipattinam. Minimum atmospheric temperature was recorded in the months of November and December 26.4°C (stations 2 and 8) and maximum 32.3°C was recorded in the months of April and May (stations 2 and 5). Minimum water temperature was recorded in the month of November 26.3°C (stations 2 and 8) and maximum 31.5°C was recorded in the months of April and May (stations 2 and 5). The salinity was minimum in month of December 25.5% (stations 2, 5 and 9) and maximum was recorded in the month of May 35.5 (stations 2, 5 and 9). The minimum pH 7.6 was recorded in the month November (stations 2, 5 and 8) and maximum was 8.3 in the month of May (stations 2, 5 and 8). Minimum dissolved oxygen 2.58 mg/L was recorded in the month of May (stations 2, 5 and 7) and maximum was 5.83 mg/L recorded in the month of November (stations 2, 5 and 8). Light extension co-efficient was recorded minimum, 1.43 Mcm-1 during the summer season in April (stations 5, 6 and 8), and maximum 7.95 Mcm-1, during monsoon season in November (stations 5, 6 and 8). The minimum turbidity 24.0 NTU was recorded during the monsoon in April (stations 2, 3 and 5) and maximum 35. 0 NTU was recorded during summer in December (stations 2, 3 and 5).