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Estimating zooplankton biomass through image analysis

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Abstract

Zooplankton biomass can be reliably estimated by a non-destructive method based on the statistical relationship between biovolume and the contents of carbon and nitrogen. Integrated zooplankton biovolume and the corresponding organic C and N contents were analysed in paired fresh and fixed (hexamine-buffered formalin) samples. Sample biovolume was estimated through the integration of individual volumes obtained by semi-automatic image analysis on fixed zooplankton samples. The corresponding C and N contents of paired fresh and preserved zooplankton were analysed with a Carlo-Erba C-H-N Analyser. The method allows simultaneous measurement of integrated and individual numbers and biomass (biovolume, C and N) spectrum. It is non-destructive and allows the minimization of errors and variability attributable to differences in the handling processes of samples and to the presence of particles other than zooplankton, like phytoplankton or detritus particulate matter.

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Acknowledgements

The authors are indebted to all the participants of cruises "Varimed" and "Hivern" on board the R.V. "Garcia del Cid", "Incoceano" on board the R.V. "Cornide de Saavedra" and "Mater" on board the R.V. "Hespérides". The comments of three unknown referees contributed to improving the manuscript. M. Parisi and X. Ramírez provided technical assistance. The study has been financially supported by Spanish grants (AMB93-0728, AMB94-1019, MAR95-1901-C03-03, MAR98-0854, MAR98-0932 and REN2001-1693) from the CICYT (Spanish Commission for Science and Technology), and international grants (MAS2-CT93-0063, EVK3-CT-2000-00022, and EVK3-1999-00015) from the European Union. ELOISE contribution № 375/40. A.C. was funded by a "Ramón y Cajal" post doctoral contract, and I.B. by the pre-doctoral fellowship PN98 01344611, both from the Ministry of Science and Technology.

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  1. Institut de Ciències del Mar (CMIMA CSIC), P. Maritim de la Barceloneta 37–49, 08003 , Barcelona, Spain

    M. Alcaraz, E. Saiz, A. Calbet, I. Trepat & E. Broglio

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  1. M. Alcaraz
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  2. E. Saiz
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  3. A. Calbet
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  4. I. Trepat
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  5. E. Broglio
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Correspondence to M. Alcaraz.

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Communicated by O. Kinne, Oldendorf/Luhe

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Alcaraz, M., Saiz, E., Calbet, A. et al. Estimating zooplankton biomass through image analysis. Marine Biology 143, 307–315 (2003). https://doi.org/10.1007/s00227-003-1094-8

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  • DOI: https://doi.org/10.1007/s00227-003-1094-8

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