Seasonal dynamics of microzooplankton communities in the Sea of Oman (Arabian Sea)
Keywords:
protozoa, protozooplankton, nauplii, appendicularia, Noctiluca, tintinnidAbstract
Seasonal dynamics of microzooplankton and changes in environmental condition were analysed during a one-year field sampling campaign in the Sea of Oman at two different stations. Monsoon winds in this region cause distinct seasonality patterns with high primary productivity during the south-west monsoon in summer (June to October) and north-east monsoon periods in winter (November to March). Microzooplankton in the Sea of Oman showed several biomass peaks throughout the year. In general, higher biomass occurred during the south-west monsoon when compared to the north-east monsoon period with maxima of 190 µg C l−1at the inshore station Bandar Al-Khyran at 1m and 308 µg C l−1 at 10m water depth. At the offshore-station, peaks of 372 µg C l−1 (1m) and 256 µg C l−1 (20m) occurred during the south-west monsoon. A strong coupling between phytoplankton and microzooplankton was observed during monsoon periods but some microzooplankton peaked during inter-monsoon periods when chlorophyll concentration was low (Bandar Al-Khyran: 372 µg C l−1 at 1m and 196 µg C l−1, 10m; Offshore-station: 419 µg C l−1, 20 m). The initiation of phytoplankton blooms in the Sea of Oman was bottom-up controlled due to strong seasonal nutrient influx during south-west and north-east monsoon periods. Highest microzooplankton biomass occurred during monsoon periods with a dominance of Noctiluciphyceae and peaks of 7596 µg C l−1 at Bandar Al-Khyran (1m) and 5942 µg C l−1 (10m). Copepod nauplii, Amoebozoa and Larvacea contributed substantially to microzooplankton biomass throughout the year. Ciliophora contributed low proportion to the total microzooplankton biomass peaking both during monsoon and inter-monsoon periods. During the spring inter-monsoon, choreotrich ciliates (tintinnids) showed distinct peaks of 15.9 µg C l−1 at Bandar Al-Khyran (1m) and 17.7 µg C l−1 (10m) as well as 18.2 µg C l−1 at Offshore-station (20m). The interplay between bottom-up controlled primary production and top-down control mechanisms regulates the phenology patterns of specific microzooplankton groups in the Sea of Oman thus pointing at complex trophodynamic interactions at the lowermost foodweb level in this low-latitude ecosystem.
References
Aberle, N.
, Lengfellner, K.
, Sommer, U.
, 2007. Spring bloom succession, grazing impact and herbivore selectivity of ciliate communities in response to winter warming. Oecologia 150, 668–681.
Aberle, N.
, Malzahn, A.M.
, Lewandowska, A.
, Sommer, U.
, 2015. Some like it hot: the microzooplankton-copepod link in a warming ocean. Mar. Ecol. Prog. Ser. 519, 103–113.
Al-Azri, A.R.N.
, Piontkovski, S.A.
, Al-Hashmi, K.A.
, Goes, J.I.
, do Gomes, H.R.
, 2010. Chlorophyll a as a measure of seasonal coupling between phytoplankton and the monsoon periods in the Gulf of Oman. Aquat. Ecol. 44, 449–461.
Al-Azri, A.
, Piontkovski, S.
, Al-Hashmi, K.
, Al-Gheilani, H.
, Al-Habsi, H.
, Al-Khusaibi, S.
, Al-Azri, N.
, 2012. The occurrence of algal blooms in Omani coastal waters. Aquat Ecosyst. Health Mgmt. 15(1), 56–63.
Al-Hashmi, K.
, Goes, J.I.
, Claereboudt, M.
, Piontkovski, S.
, Al Azri, A.
, Smith, S.L.
, 2014. Variability of dinoflagellates and diatoms in the surface waters of Muscat, Sea of Oman: comparison between enclosed and open ecosystem. Int J Ocean Oceanogr. 8, 137–152.
Azam, F.
, Fenchel, T.
, Field, J.G.
, Gray, J.S.
, Meyer-Reil, L.A.
, Thingstad, F.
, 1983. The ecological role of water-column microbes in the sea. Mar. Ecol. Prog. Ser. 10, 257–263.
Bils, F.
, Moyano, M.
, Aberle, N.
, Hufnagl, M.
, Alvarez-Fernandez, S.
, Peck, M.A.
, 2017. Exploring the microzooplankton-ichthyoplankton link: a combined field and modeling study of Atlantic herring (Clupea harengus) in the Irish Sea. J. Plankton Res. 39, 147–163.
Boyce, D.G.
, Lewis, M.R.
, Worm, B.
, 2010. Global phytoplankton decline over the past century. Nature 466, 591–596.
Burkill, P.H.
, Mantoura, R.F.C.
, Owens, N.J.P.
, 1993. Biogeochemical cycling in the Northwestern Indian Ocean - A brief overview. Deep-Sea Res. 40, 643–649.
Calbet, A.
, 2008. The trophic roles of microzooplankton in marine systems. ICES J. Mar. Sci. 65, 325–331.
Dennett, M.R.
, Caron, D.A.
, Murzov, S.A.
, Polikarpov, I.G.
, Gavrilova, N.A.
, Georgieva, L.V.
, Kuzmenko, L.V.
, 1999. Abundance and biomass of nano- and microplankton during the 1995 Northeast Monsoon and Spring Intermonsoon in the Arabian Sea. Deep-Sea Res. 46, 1691–1717.
Figueiredo, G.M.
, Montagnes, D.J.S.
, Nash, R.D.M.
, 2009. The importance of protozooplankton as prey for copepods in the coastal areas of the central Irish Sea. Hydrobiologia 628, 227–239.
Gifford, D.J.
, Caron, D.A.
, 2000. Sampling, preservation, enumeration and biomass of marine protozooplankton. In:
Roger Harris
,
J. Lenz
,
M. Huntley
,
P. Wiebe
,
H.R. Skjoldal
(Eds.),
ICES Zooplankton Methodology Manual
, pp. 193–221. Academic Press, MA.
Goes, J.I.
, Thoppil, P.G.
, Gomes, H.D.
, Fasullo, J.T.
, 2005. Warming of the Eurasian landmass is making the Arabian Sea more productive. Science 308, 545–547.
Gowing, M.M.
, Garrison, D.L.
, Wishner, K.F.
, Gelfman, C.
, 2003. Mesopelagic microplankton of the Arabian Sea. Deep-Sea Research Part 50, 1205–1234.
Hopcroft, R.R.
, Roff, J.C.
, 1998. Zooplankton growth rates: the influence of size in nauplii of tropical marine copepods. Mar. Biol. 132, 87–96.
Hopcroft, R.R.
, Roff, J.C.
, Lombard, D.
, 1998. Production of tropical copepods in Kingston Harbour, Jamaica: the importance of small species. Mar. Biol. 130, 593–604.
Irigoien, X.
, Flynn, K.J.
, Harris, R.P.
, 2005. Phytoplankton blooms: a 'loophole' in microzooplankton grazing impact? J. Plankton Res. 27, 313–321.
Jaspers, C.
, Nielsen, T.G.
, Carstensen, J.
, Hopcroft, R.R.
, Moller, E.F.
, 2009. Metazooplankton distribution across the Southern Indian Ocean with emphasis on the role of Larvaceans. J. Plankton Res. 31, 525–540.
Jonasdottir, S.H.
, Nielsen, T.G.
, Borg, C.M.A.
, Moller, E.F.
, Jakobsen, H.H.
, Satapoomin, S.
, 2013. Biological oceanography across the Southern Indian Ocean - basin scale trends in the zooplankton community. Deep-Sea Res 75, 16–27.
Landry, M.R.
, Calbet, A.
, 2004. Microzooplankton production in the oceans. ICES J. Mar. Sci. 61, 501–507.
Loeder, M.G.J.
, Kraberg, A.C.
, Aberle, N.
, Peters, S.
, Wiltshire, K.H.
, 2012. Dinoflagellates and ciliates at Helgoland Roads, North Sea. Helgol. Mar. Res. 66, 11–23.
Lopez-Urrutia, A.
, Irigoien, X.
, Acuna, J.L.
, Harris, R.
, 2003. In situ feeding physiology and grazing impact of the appendicularian community in temperate waters. Mar. Ecol. Prog. Ser. 252, 125–141.
Montagnes, D.J.S.
, Dower, J.F.
, Figueiredo, G.M.
, 2010. The Protozooplankton-Ichthyoplankton Trophic Link: An Overlooked Aspect of Aquatic Food Webs. J. Eukaryot Microbiol. 57, 223–228.
Piontkovski, S.
, Chiffings, T.
, 2014. Long-term changes of temperature in the Sea of Oman and the Western Arabian Sea. Int. J. Ocean Oceanogr. 8, 53–72.
Piontkovski, S.A.
, Claereboudt, M.R.
, 2012. Interannual changes of the Arabian Sea productivity. Mar Biol Res 8, 189–194.
Piontkovski, S.A.
, Al-Azri, A.R.N.
, Al-Hashmi, K.A.
, 2011. Seasonal and interannual variability in chlorophyll a in the Gulf of Oman compared to the open Arabian Sea regions. Int. J. Remote Sens. 32, 7703–7715.
Piontkovski, S.
, Al-Maawali, A.
, Al-Muna Al-Manthri, W.
, Al-Hashmi, K.
, Popova, E.
, 2013. Zooplankton of Oman coastal waters. Agricult. Mar. Sci. 18, 37–50.
Rao, S.A.
, Dhakate, A.R.
, Saha, S.K.
, Mahapatra, S.
, Chaudhari, H.S.
, Pokhrel, S.
, Sahu, S.K.
, 2012. Why is Indian Ocean warming consistently? Clim. Chang. 110, 709–719.
Richardson, A.J.
, 2008. In hot water: zooplankton and climate change. ICES J Mar Sci 65, 279–295.
Rose, J.M.
, Caron, D.A.
, 2007. Does low temperature constrain the growth rates of heterotrophic protists? Evidence and implications for algal blooms in cold waters. Limnol. Oceanogr. 52, 886–895.
Sherr, E.B.
, Sherr, B.F.
, Paffenhoefer, G.A.
, 1986. Phagotrophic protozoa as food for metazoans: A "missing" trophic link in marine pelagic food webs? Mar. Microb. Food Webs 1, 61–80.
Skalar
, 1996. Skalar Analytical Manual, Segmented flow analyser, Publication No. 0101022A.
Sommer, F.
, Hansen, T.
, Feuchtmayr, H.
, Santer, B.
, Tokle, N.
, Sommer, U.
, 2003. Do calanoid copepods suppress appendicularians in the coastal ocean? J. Plankton Res. 25, 869–871.
Strickland, J.
, Parsons, T.
, 1972. A practical handbook of sea water analysis. Fisheries Research Board of Canada, Ottawa, ON.
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