Diatom (Bacillariophyceae) assemblages in salt marshes of south-central Chile: Relations with tidal inundation time and salinity

Yuki Sawai, Tamotsu Nagumo, Yuichi Namegaya, MARCO ANTONIO CISTERNAS VEGA, Marcelo Lagos, Masanobu Shishikura

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

To reconstruct sea-level history from changes in tidal environments using diatom assemblages, we need to better understand the relations among brackish diatom assemblages and changing environments along elevational gradients from diverse coastal sites. Our statistical analysis reveals relations between environmental variables and brackish benthic diatom assemblages in the little studied region of south-central Chile. Along four transects across salt marshes at two sites, we identified 224 diatom taxa in 112 samples. Detrended canonical correspondence analysis showed that tidal exposure time index and salinity were appropriately regressed against the abundance of diatom species using unimodal-based methods. Our tests of classical and inverse regressions of weighted average and weighted averaging partial least squares (WA-PLS) showed that WA-PLS resulted in the highest coefficient of determination and the lowest root-mean square of the error of prediction. Our regression will be useful in reconstructing environmental variables from fossil diatom assemblages in Chile.

Original languageEnglish
Pages (from-to)29-37
Number of pages9
JournalPhycological Research
Volume65
Issue number1
DOIs
StatePublished - 1 Jan 2017
Externally publishedYes

Keywords

  • detrended canonical correspondence analysis
  • regression analysis
  • tidal exposure time

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