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Phytoplankton functional groups as indicators of human impacts along the River Loire (France)

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Abstract

The phytoplankton functional group concept is successfully used to assess ecological status in lakes (Q index), and also provides a method for lotic ecosystems (Q (r) index). Here, we examine the Q (r) composition metric to demonstrate local to regional scale human effects on natural distribution of phytoplankton along the River Loire. Distribution of phytoplankton functional groups coupled with chemical and physical parameters are described at whole river scale (19 stations, between March and November 2009). Natural longitudinal changes were reflected by the switch from benthic Pennales (T B ) towards meroplanktic greens (J) via unicellular centric diatoms (D/C). While upstream human pressure was mostly associated to species indicating eutrophic, stagnant environments (coda P, M, H1, Y), downstream attenuation of the Q (r) reflected enriched, shallow environments with prolonged residence time (coda J, X2, X1). Occurrence of minimum Q (r) index values were synchronized to late summer, but the longer was the distance from the source, the earlier was the seasonal decrease of Q (r). Increasing downstream co-dominance of codon F evidenced an ascending light availability in summer. The longitudinal distribution of functional groups allowed us to conclude that functional diversity might be able to sign human-affected richness, while simply species diversity does not.

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Acknowledgments

We thank the Loire-Bretagne Water Authority (France) for allowing us to publish these results. This study was supported by the Hungarian National Science Foundation (OTKA K 75552) grant and also motivated by the TÁMOP-4.2.2.-B-10/1-2010-0025 fellowship operated by the University of Pannonia (Veszprém, Hungary). We thank Carole Bouzidi for seeking for discharge data for this study. The manuscript was improved by valuable comments of three anonymous reviewers. This study was presented at the 16th Workshop of the International Association of Phytoplankton Taxonomy and Ecology (IAP), San Michele all’Adige (Trento), Italy, 21–28 August 2011.

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  1. Department of Limnology, University of Pannonia, Egyetem ut 10, Veszprém, 8200, Hungary

    András Abonyi & Judit Padisák

  2. Bi-Eau, 15, rue Lainé-Laroche, 49000, Angers, France

    András Abonyi, Maria Leitão & Anne Marie Lançon

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  1. András Abonyi
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Guest editors: N. Salmaso, L. Naselli-Flores, L. Cerasino, G. Flaim, M. Tolotti & J. Padisák / Phytoplankton responses to human impacts at different scales: 16th workshop of the International Association of Phytoplankton Taxonomy and Ecology (IAP)

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Abonyi, A., Leitão, M., Lançon, A.M. et al. Phytoplankton functional groups as indicators of human impacts along the River Loire (France). Hydrobiologia 698, 233–249 (2012). https://doi.org/10.1007/s10750-012-1130-0

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