Comparison of mesozooplankton communities from a pair of warm- and cold-core eddies off the coast of Western Australia

Author(s): Strzelecki J, Koslow JA, Waite, A

Abstract

We examined the abundance and biomass, size, trophic and community structure of the mesozooplankton within a pair of warm- and cold-core eddies off the west coast of Australia in October 2003, about five months after their initial formation. Zooplankton assemblages were highly diverse in both eddies, with little dominance by any taxa. Assemblages were significantly different in the two eddies, and night assemblages differed from day. Contrary to initial expectation, mesozooplankton abundance and biomass were twice as high in the warm-core eddy as in the cold-core eddy. This was consistent with the higher phytoplankton and microzooplankton biomass and higher primary production in the warm-core eddy. The source water for the warm-core eddy was Leeuwin Current water with about a 10% admixture of shelf water. The plankton biomass and productivity of these water masses are substantially higher than of subtropical Indian Ocean water, the source water for the mixed layer of the cold-core eddy. Five months after eddy formation, the abundance and biomass of zooplankton in the eddies continued to reflect the values generally observed in their parent water masses. The trophic structure of the zooplankton in both eddies was dominated by carnivores (mostly chaetognaths). Although this apparent trophic structure may be an artefact of sampling oligotrophic waters with coarse-meshed (335 μm) nets, it points to a ‘lumpiness’ in the Sheldon particle spectrum.

Similar Articles

Wind-driven coastal upwelling along the western boundary of the Bay of Bengal during the southwest monsoon

Author(s): Shetye SR, Shenoi SSC, Gouveia AD, Michael GS, Sundar D, et al.

The Western Boundary Current of the seasonal subtropical gyre in Bay of Bengal

Author(s): Shetye SR, AD Gouveia, SSC Shenoi, DSundar, GSMichael, et al.

Hydrography and circulation in the western Bay of Bengal during the northeast monsoon

Author(s): Shetye SR, Gouveia AD, Shankar D, Shenoi SSC, Vinayachandran PN, et al.

Observation of the western boundary current of the Bay of Bengal Deep-Sea Res 44:135-145

Author(s): Sanilkumar KV, Kuruvilla TV, Jogendranath D, and Rao RR

Eddy-mediated biological productivity in the Bay of Bengal during fall and spring intermonsoons Deep Sea Research II 54: 1619-1640

Author(s): Prasanna Kumar S, Nuncio M, Ramaiah N, Sardesai S, Narvekar, Jayu, Fernandes, Veronica, & Paul, Jane T

Are eddies nature’s trigger to enhance biological productivity in the Bay of Bengal? Geophys Res Lett 31

Author(s): Prasanna Kumar S, Nuncio M, Narvekar J, Kumar A, Sardesai S, et al.

Seasonal cycle of physicalforcing and biological response in the Bay of BengalIndian J Mar Sci 39: 388-405

Author(s): Prasanna Kumar S, Nuncio M, Narvekar J, Ramaiah N, Sardessai S, et al

Influence of basin-scale and mesoscale physical processes onbiological productivity in the Bay of Bengal during the summer monsoon

Author(s): Muraleedharan KR, Jasmine P, Achuthankutty CT, Revichandran C, Dineshkumar PK, et al

ICES zooplankton methodology manual

Author(s): Harris RP, Wiebe PH, Lenz JH, Skjoldal R & Huntley M

Detection of Bay of Bengaleddies from Topex and in situ observations

Author(s): Gopalan AKS, GopalaKrishna VV, Ali MM, Sharma R

Forcing mechanisms of the Bay of Bengal circulation Current SciIndia 71: 753-763

Author(s): Vinayachandran PN, Shetye SR, Sengupta D, Gadgil S

Development of a subsurface chlorophyll maximum at the entrance to the Gulf of Finland, Baltic Sea

Author(s): Kononen KJ, S Hallfors, M Kokkonen, H Kuosa, J Laanemets, J Pavelson

Analysis of Marine Ecosystems

Author(s): Owen RW

Vertical flux of respiratory carbon by oceanic diel migrant biota Deep-Sea Res 37: 685–694

Author(s): Longhurst AR, Bedo A, Harrison WG, Head EJH, Sameoto DD

Zooplankton vertical migration and the active transport of dissolved organic and inorganic carbon in the Sargasso

Author(s): Steinberg DK, Carlson CA, Bates NR, Goldthwait SA, Madin LP, et al.