Modern diatom assemblages in surface sediments from shallow lakes and streams in southern Pampas (Argentina) |
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Authors: | G S Hassan E Tietze C G De Francesco |
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Institution: | 1. CONICET-Instituto de Geología de Costas y del Cuaternario, Universidad Nacional de Mar del Plata, CC722, 7600, Mar del Plata, Argentina
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Abstract: | Diatom assemblages preserved in continental sedimentary successions of the southern Pampas (Argentina) can provide useful
indicators of past environmental changes. Ecological data, however, are scarce. In order to provide modern data for diatom-based
paleoenvironmental reconstructions, sediments from shallow lakes and streams of the region were analyzed. A total of 131 diatom
species were identified. Canonical correspondence analysis was used to identify the physical and chemical environmental parameters
that best explained the distribution of taxa. Cocconeis placentula, Hippodonta hungarica, Navicula veneta, Cyclotella meneghiniana and Nitzschia amphibia were the most widely extended species. The highest percentage variance in diatom data was explained by conductivity and nutrient
concentrations. Diatom assemblage composition was more variable in shallow lakes than in streams, which is in agreement with
the different hydrological and geomorphological characteristics of these environments. The results obtained in the present
work provide useful analogues for paleoenvironmental reconstructions of water bodies in southern Pampas. |
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