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Dead diatom assemblages in surface sediments from a low impacted estuary: the Quequén Salado river, Argentina

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Abstract

In the context of a main project that aims to recover modern data on diatom distribution applicable to paleosalinity reconstructions in coastal areas of Southern South America, the composition and distribution of dead diatom assemblages in the littoral zone of the Quequén Salado estuary (Argentina) were studied. Diatom zones were defined along the estuarine gradient by cluster analysis and related to the salinity range and sediment composition by Canonical Correspondence Analysis. Four diatom zones were identified. A mixture of marine, brackish and freshwater diatoms, probably allochthonous, characterized the inlet (zone I). Marine/brackish taxa, represented mainly by Paralia sulcata dominated zone II, characterized by polyhaline conditions and sandy sediments. Zone III was characterized by mesohaline conditions, muddy sediments and the dominance of the estuarine diatom Amphora helenensis. Brackish/freshwater and freshwater diatoms dominated the headwaters (zone IV), where salinity was always below 5‰. The comparison of Quequén Salado diatom assemblages with previous results from the Quequén Grande estuary showed a similar taxonomic composition between both estuaries. However, differences in the salinity ranges of the estuaries (related to differences in the degree of human impact and tidal range) lead to a displacement in their spatial distribution along the longitudinal estuarine axis. This paper contributes to the knowledge of the ecological requirements of South American estuarine diatoms and provides useful data for paleosalinity reconstructions in the region.

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Acknowledgements

This research is part of the doctoral thesis of G. S. Hassan at the University of Mar del Plata. Financial support for this work was provided by the project 15/E125 from Universidad Nacional de Mar del Plata. We are indebted to C. De Francesco for fieldwork assistance and for his valuable comments and suggestions on earlier versions of the manuscript. Judit Padisák and two anonymous reviewers provided helpful comments improving this paper. G. S. Hassan was funded by the National Council of Scientific and Technical Research of Argentina (CONICET) through a fellowship.

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Correspondence to Gabriela S. Hassan.

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Hassan, G.S., Espinosa, M.A. & Isla, F.I. Dead diatom assemblages in surface sediments from a low impacted estuary: the Quequén Salado river, Argentina. Hydrobiologia 579, 257–270 (2007). https://doi.org/10.1007/s10750-006-0407-6

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