Phytoplankton community structure changes during autumn and spring in response to environmental variables in Methana, Saronikos Gulf, Greece
| Autor: | Ioannis Michailidis, Olga Koukousioura, Margarita D. Dimiza, Elisavet Skampa, Pierros Patoucheas, Stella Psarra, Paraskevi Nomikou, Katerina Aligizaki, Maria Triantaphyllou |
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| Rok vydání: | 2021 |
| Předmět: |
Nitzschia
Health Toxicology and Mutagenesis 010501 environmental sciences 01 natural sciences Spring (hydrology) Phytoplankton medicine Environmental Chemistry Submarine volcano 0105 earth and related environmental sciences Diatoms geography geography.geographical_feature_category Greece biology General Medicine Plankton Seasonality biology.organism_classification medicine.disease Pollution Oceanography Dinoflagellida Environmental science Seasons Environmental Monitoring Hydrothermal vent Dinophyceae |
| Zdroj: | Environmental Science and Pollution Research. 28:33854-33865 |
| ISSN: | 1614-7499 0944-1344 |
| DOI: | 10.1007/s11356-020-12272-z |
| Popis: | Phytoplankton community was investigated during two contrasting periods using offshore plankton samples in the volcanic area of Methana peninsula (Saronikos Gulf): the first at early autumn (warm period, September 2016) and the second one at early spring (cold period, March 2017). In order to investigate the phytoplankton community structure in the complex geo-biochemical conditions of the area, samples were collected from stations near the CO2 hydrothermal vents, at the hydrothermal sulfur and radioactive springs and at a fishery nearby Methana town. Three major phytoplankton groups, Bacillariophyceae, Dinophyceae, and Prymnesiophyceae, were studied, using inverted microscopy. In early autumn, Dinophyceae were dominant in the majority of the stations with cell concentrations of Prorocentrum spp. up to ~ 35.5 × 103 cells l−1. In early spring, the dominant class was Bacillariophyceae with dominant genus Nitzschia/Pseudo-nitzschia presenting cell concentrations up to ~ 33.9 × 103 cells l−1. Furthermore, Prymnesiophyceae appeared in both spring and autumn samples with small fluctuations. Total phytoplankton cell concentrations followed a seasonal trend, presenting slightly lower values in the hydrothermal-effected area in comparison with the broader Saronikos Gulf, confirming the prevalence of oligotrophic conditions. Seasonal variation was very strong, revealing an association with water temperature and nutrient content. Those environmental variables proved to have a strong effect that was reflected in the phytoplankton community structure. |
| Databáze: | OpenAIRE |
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