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How diverse are planktonic cryptomonads in Brazil? Advantages and difficulties of a taxonomic-biogeographical approach

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Phytoplankton and Equilibrium Concept: The Ecology of Steady-State Assemblages

Part of the book series: Developments in Hydrobiology ((DIHY,volume 172))

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Abstract

We compare ‘temperate data’ with information contained in 49 surveys of cryptomonads from Brazilian tropical regions. These surveys contain a total of 351 records relative to a total of 38 taxa at the species level or below. All taxa were identified using traditional morphological characters visible with the light microscope. Two taxa appear to be new species, and amongst the known species Cryptomonas erosa Ehrenberg is the most frequently recorded one. To date two species of Pseudocryptomonas Bicudo & Tell (all containing multiple photosynthetic endosymbionts/chloroplasts) and the species Cryptomonas brasiliensis Castro, C. Bicudo D. Bicudo have not been found outside Brazil. With respect to their geographical distribution in Brazilian tropical regions, cryptomonads are better represented in reservoirs and coastal lagoons located in the south-eastern part of the country. Some species appear to be restricted to brackish coastal ecosystems (oligo- to mesohaline and meso- to eutrophic waters). There are only four records of marine cryptomonads. A comparative study of three different kinds of shallow aquatic environments in Brazil — north-eastern reservoirs, a flood-plain Amazonian lake, and brackish lagoons on the south-eastern coast — shows that cryptomonads are to be found constantly, and their species number density, and biomass are generally low (usually < 10%) in relation to the other phytoplankton. The case of Plagioselmis Butcher emend. Novarino, Lucas & Morrall, amongst others, exemplifies the great difficulties encountered while attempting to interpret biogeographical information based on light microscopy within the context of a modern systematic and taxonomic framework based on electron microscopy.

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Menezes, M., Novarino, G. (2003). How diverse are planktonic cryptomonads in Brazil? Advantages and difficulties of a taxonomic-biogeographical approach. In: Naselli-Flores, L., Padisák, J., Dokulil, M.T. (eds) Phytoplankton and Equilibrium Concept: The Ecology of Steady-State Assemblages. Developments in Hydrobiology, vol 172. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2666-5_23

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  • DOI: https://doi.org/10.1007/978-94-017-2666-5_23

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-90-481-6433-2

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