NDLI: Mixotrophic species influencing phytoplankton community structuring during the filling phase of a subtropical reservoir

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Mixotrophic species influencing phytoplankton community structuring during the filling phase of a subtropical reservoir

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Brazilian Journal of Botany : Volume 40, Issue 3, September 2017

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Mixotrophic species influencing phytoplankton community structuring during the filling phase of a subtropical reservoir

Content Provider	Springer Nature Link
Author	Bortolini, J. C. Train, S. Jati, S.
Copyright Year	2017
Abstract	Aiming to evaluate temporal alterations in the dynamics of the phytoplankton community in response to environmental changes occurring during the filling phase of Santa Clara reservoir, samples were taken weekly from April to June 2005 in the region close to the dam, following vertical gradients of light and temperature. Sampling depths comprised the subsurface (sup), upper limit of the euphotic zone (Z$_{eu}$), lower limit of the epilimnion (Z$_{mix}$) and near the bottom (Z$_{max}$). Low light availability hindered phytoplankton growth throughout the period. Descriptor species (biovolume > 5%) were classified in 17 functional groups (FGs): X2, Y, D, C, P, Lo, E, B, Na, MP, A, J, K, S1, Ws, F and M. Phytoplankton biovolume was low during the filling phase, and characterized a meso-oligotrophic environment. Mixotrophic species belonging to functional groups X2, Y, Lo and E provided the greatest contribution to total biovolume and dominated throughout the period. Water column thermal structure and a tendency of a decrease in nutrient concentrations influenced the change in the dominance of FGs. Our results suggest that mixotrophic strategy was determinant for phytoplankton production and biomass, representing a competitive advantage over strictly autotrophic phytoplankton, suggesting that during the filling phase of Santa Clara reservoir, the microbial loop played an important role in the flow of energy and carbon to higher trophic levels of the food web. Therefore, our initial hypothesis that the disruption of longitudinal connectivity in the river and alterations in the mixing regime and light availability would change phytoplankton community structure causing a replacement in the dominance of FGs containing turbulence-tolerant species by FGs containing species with a higher demand for water column stability and light availability was not corroborated. Although a species replacement was observed, this was not due to enhanced resource availability, but rather due to the trophic abilities of the FGs.
Starting Page	933
Ending Page	941
Page Count	9
File Format	PDF
ISSN	01008404
Journal	Brazilian Journal of Botany
Volume Number	40
Issue Number	4
e-ISSN	18069959
Language	English
Publisher	Springer International Publishing
Publisher Date	2017-09-09
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Systematics/Taxonomy/Biogeography Mixotrophy Impoundment Brazil Functional groups
Content Type	Text
Resource Type	Article
Subject	Plant Science

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