Blooms of Trichodesmium erythraeum in the South Eastern Arabian Sea during the onset of 2009 summer monsoon
Tóm tắt
This study presents in situ evidence for the blooms of Trichodesmium erythraeum observed in the shelf waters of the South Eastern Arabian Sea (SEAS) during the onset of the southwest monsoon in June 2009. Evidence showed that water surface discoloration was caused by the accumulation of T. erythraeum, and that the water column contained a colony of T. thiebautii. The surface water color in the bloom region varied from pale brown to pinkish red. Pale brown indicated healthy algae at the peak of its photosynthetic activity, while pinkish red indicated the presence of photosynthetically less active filaments. Zooplankton abundance, especially copepodites, in the bloom area substantiated the theory that Trichodesmium filaments are excellent epiphytes to which the copepodites cling. The bloom area was very fertile with copious quantities of dissolved oxygen (6.85 ml L−1), PO4-P (0.108 μmol L−1) and SiO4 (1.29 μmol L−1). Lower NO3-N (0.028 μmol L−1) values in the bloom area did not appear to affect Trichodesmium growth from molecular nitrogen fixation. However, lower NO3-N values altered the normal phytoplankton composition of this area.
Tài liệu tham khảo
Adhikary SP, Sahu J (1992) Studies on the Trichodesmium bloom of Chilka Lake, East coast of India. Phykos 30:101–107
Bjornberg TKS (1965) Observations on the development and the biology of the Miracidae Dana (Copepoda: crustacean). Bull Mar Sci Gulf Caribb 15:512–520
Bryceson I, Fay P (1980) Nitrogen fixation and the autecology of Oscillatoria erythraea (Erhenberg) Kuetzing a planktonic cyanophyte from the coastal waters of Tanzania: a preliminary investigation. In: Symposium on the coastal and marine environment of the Red Sea, Gulf of Aden and tropical Western Indian Ocean in Khartoum, Sudan, pp 471–494
Capone DG, Burns JA, Montoya JP, Subramaniam A, Mahaffey C, Gunderson T, Michaels AF, Carpenter EJ (2005) Nitrogen fixation by Trichodesmium spp.: an important source of new nitrogen to the tropical and subtropical North Atlantic Ocean. Global Biogeochem Cy 19:1–17
Capone DG, Carpenter EJ (1982) Nitrogen fixation in the marine environment. Science 217:1140–1142
Capone DG, Zehr JP, Paerl HW, Bergman B, Carpenter EJ (1997) Trichodesmium a globally significant marine bacteria. Science 276:1221–1229
Carpenter EJ (1983) Physiology and Ecology of marine planktonic Oscillatoria (Trichodesmium). Mar Biol Lett 4:69–85
Carpenter EJ, Romans K (1991) Major role of the cyanobacterium Trichodesmium in nutrient cycling in the North Atlantic Ocean. Science 254:1356–1358
Chacko PI (1942) An unusual incidence of mortality of marine fauna. Curr Sci 11:404
Chang J, Chiang KP, Gong GC (2000) Seasonal variation and cross-shelf distribution of the nitrogen fixing cyanobacterium, Trichodesmium, in the southern east China Sea. Cont Shelf Res 20:479–492
Devassy VP, Bhattathiri PMA, Qasim SZ (1978) Trichodesmium phenomenon. Indian J Mar Sci 73:168–186
Devanesen DW (1942) Plankton studies in the fisheries branch of the Department of Industries and Commerce, Madras. Curr Sci 11:142–143
Jyothibabu R, Madhu NV, Murukesh N, Haridas PC, Nair KKC, Venugopal P (2003) Intense bloom of Trichodesmium erythraeum (cyanophyte) in the open waters along east coast of India. Indian J Mar Sci 32:165–167
Lugomela C, Lyima TJ, Bryceson I, Semesi AK (2002) Trichodesmium in coastal waters of Tanzania: diversity, seasonality, nitrogen and carbon fixation. Hydrobiologia 477:1–13
Nair VE, Devassy VP, Madhupratap M (1992) Blooms of phytoplankton along the coast of India associated with nutrient enrichment and the response of zooplankton. In: Vollenweiden RA et al. (eds) Marine coastal eutrophication, Science of the Total Environment, Elsevier, Amsterdam, pp 819–828
Parsons TR, Maita Y, Lalli CM (1984) A manual of chemical and biological methods for Seawater analysis. Pergamon Press, New York, 173 p
Santhanam R, Srinivasan A, Ramadhas V, Devaraj M (1994) Impact of Trichodesmium bloom on the plankton and productivity in the Tuticorin Bay, Southeast coast of India. Indian J Mar Sci 23:27–30
Satpathy KK, Nair KVK (1996) Occurrence of phytoplankton bloom and its effect on coastal water quality. Indian J Mar Sci 25:145–147
Sellner KG (1997) Physiology, ecology and toxic properties of marine cyanobacteria bloom. Limnol Oceanogr 42:1089–1104
Shenoi SC, Shankar D, Gopalakrishna VV, Furand F (2005) Role of ocean in the genesis and annihilation of the core of the warm pool in the South Eastern Arabian Sea. Mausam 56(1):147–160
Smitha BR, Sanjeevan VN, Vimalkumar KG, Ravichandran C (2008) On the upwelling off the southern tip and along the west coast of India. J Coast Res 24(4C):95–102
Suvapepant S (1992) Trichodesmium blooms in the Gulf of Thailand. In: Carpenter EJ et al. (eds) Marine pelagic cyanobacteria: Trichodesmium and other diazotrophs, Kluwer, pp 343–348
Zehr JP, Waterbury JB, Turner PJ, Montoya JP, Omoregie E, Steward GF, Hansen A, Karl DM (2001) Unicellular cyanobacteria fix N2 in the subtropical North Pacific Ocean. Nature 412:635–638