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Some Aspects of Phytoplankton Long-Term Alterations Off Bulgarian Black Sea Shelf

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Book cover Sensitivity to Change: Black Sea, Baltic Sea and North Sea

Part of the book series: NATO ASI Series ((ASEN2,volume 27))

Abstract

The present paper focus on the alterations of spring-summer phytoplankton communities (1961/70–1991/94), the expansion of “bloom” phenomena and the shift of Bacillariophyta:Dinophyta biomass ratio on long-term basis (1955–1994) off the Bulgarian Black Sea shelf The results reveal a substantial increase in the total biomass (2 times in spring and more than 7 times in summer) and the total abundance (about 9 and 12 times respectively). An apparent expansion in the frequency and intensity of phytoplankton “blooms” is reported with dramatic shift in the taxonomic composition and number of species involved (27 out of total 255 species found off the Bulgarian shelf). The share of Bacillariophyta in the total biomass decreases from 86% (up to 1970) to 42% in 1970–1990 and 53% in 1991–1994, the shift in the nutrients ratios (Si:N and Si:P) deemed to be the possible controlling factor.

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Authors and Affiliations

  1. Institute of Oceanology, BAS, Varna, 9000, PO Box 152, Bulgaria

    S. Moncheva & A. Krastev

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  1. S. Moncheva
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  2. A. Krastev
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Editors and Affiliations

  1. Institute of Marine Sciences, METU, Erdemli, İçel, Turkey

    Emin Özsoy

  2. Shirshov Institute of Oceanology, Moscow, Russia

    Alexander Mikaelyan

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Moncheva, S., Krastev, A. (1997). Some Aspects of Phytoplankton Long-Term Alterations Off Bulgarian Black Sea Shelf. In: Özsoy, E., Mikaelyan, A. (eds) Sensitivity to Change: Black Sea, Baltic Sea and North Sea. NATO ASI Series, vol 27. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5758-2_7

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  • DOI: https://doi.org/10.1007/978-94-011-5758-2_7

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-6429-3

  • Online ISBN: 978-94-011-5758-2

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