Influence of microphytobenthos on the sedimentary organic matter composition in two contrasting estuarine microhabitats
| Autor: | Rubén J. Lara, Carolina Fernández, Elisa R. Parodi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Biomass (ecology) Chlorophyll a geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Community structure General Medicine 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Pollution chemistry.chemical_compound Water column chemistry Environmental chemistry Salt marsh Environmental science Sedimentary organic matter Organic matter Microbial mat 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Environmental Monitoring and Assessment. 193 |
| ISSN: | 1573-2959 0167-6369 |
| DOI: | 10.1007/s10661-021-08888-4 |
| Popis: | The influence of microphytobenthic community on the composition of sedimentary organic matter was evaluated in two Bahia Blanca estuary microhabitats contrasting in vegetation and hydrodynamic conditions; namely, S1 located in a Sarcocornia perennis saltmarsh with macroscopic microbial mats and S2 in a mudflat without macroscopic microbial mats or vegetation. Moisture, organic matter, chlorophyll a, phaeopigments, carbohydrates (CH), proteins (PRT), and abundance and structure of microphytobenthic community were evaluated in surface sediments. Higher moisture was observed at S2 and was related to the proximity of this site to the subtidal zone and the effect of the environmental variables temperature and rain. No significant differences were found in organic matter content between sites; however, at S1, a higher concentration was registered during winter and early spring associated to the period of higher microphytobenthic biomass. Chlorophyll a and phaeopigments were higher at S1, attributed to the higher microphytobenthos abundance at this site. Differences in microphytobenthos were observed not only in quantity but also in community structure since at S1 filamentous cyanobacteria dominated the community, whereas at S2, higher abundance of centric diatoms and the absence of cyanobacteria were observed during most of the study. S1 showed higher concentration of proteins and carbohydrates which could be attributed to the higher production of fresh organic matter by microphytobenthos. The total protein and carbohydrate concentrations allowed us to classify both microhabitats into the meso-oligotrophic category, contrasting with the classification made by other authors using water column proxies. |
| Databáze: | OpenAIRE |
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