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Atlas of phytoplankton phenology indices in selected Eastern Mediterranean marine ecosystems

Kournopoulou, Antonia ; Kikaki, Katerina ; Varkitzi, Ioanna ; Psarra, Stella ; Assimakopoulou, Georgia ; Karantzalos, Konstantinos ; Raitsos, Dionysios E

Scientific reports, 2024-04, Vol.14 (1), p.9975-9975, Article 9975 [Periódico revisado por pares]

England: Nature Publishing Group

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Atlas of phytoplankton phenology indices in selected Eastern Mediterranean marine ecosystems
Autor: Kournopoulou, Antonia ; Kikaki, Katerina ; Varkitzi, Ioanna ; Psarra, Stella ; Assimakopoulou, Georgia ; Karantzalos, Konstantinos ; Raitsos, Dionysios E
Assuntos: Algae ; Biomass ; Chlorophyll ; Chlorophyll - analysis ; Chlorophyll - metabolism ; Chlorophyll A - analysis ; Chlorophyll A - metabolism ; Chlorophylls ; Coastal waters ; Coastal zone ; Ecological function ; Ecosystem ; Environmental Monitoring - methods ; Food sources ; Food webs ; Gulfs ; Marine ecosystems ; Mediterranean Sea ; Ocean colour ; Oceans ; Phenology ; Phytoplankton ; Phytoplankton - growth & development ; Phytoplankton - physiology ; Plankton ; Remote sensing ; Remote Sensing Technology ; Satellites ; Seasonal variations ; Seasonality ; Seasons ; Spatial discrimination ; Trophic levels ; Water quality ; Water quality management
É parte de: Scientific reports, 2024-04, Vol.14 (1), p.9975-9975, Article 9975
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
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Descrição: Phytoplankton is a fundamental component of marine food webs and play a crucial role in marine ecosystem functioning. The phenology (timing of growth) of these microscopic algae is an important ecological indicator that can be utilized to observe its seasonal dynamics, and assess its response to environmental perturbations. Ocean colour remote sensing is currently the only means of obtaining synoptic estimates of chlorophyll-a (a proxy of phytoplankton biomass) at high temporal and spatial resolution, enabling the calculation of phenology metrics. However, ocean colour observations have acknowledged weaknesses compromising its reliability, while the scarcity of long-term in situ data has impeded the validation of satellite-derived phenology estimates. To address this issue, we compared one of the longest available in situ time series (20 years) of chlorophyll-a concentrations in the Eastern Mediterranean Sea (EMS), along with concurrent remotely-sensed observations. The comparison revealed a marked coherence between the two datasets, indicating the capability of satellite-based measurements in accurately capturing the phytoplankton seasonality and phenology metrics (i.e., timing of initiation, duration, peak and termination) in the studied area. Furthermore, by studying and validating these metrics we constructed a satellite-derived phytoplankton phenology atlas, reporting in detail the seasonal patterns in several sub-regions in coastal and open seas over the EMS. The open waters host higher concentrations from late October to April, with maximum levels recorded during February and lowest during the summer period. The phytoplankton growth over the Northern Aegean Sea appeared to initiate at least a month later than the rest of the EMS (initiating in late November and terminating in late May). The coastal waters and enclosed gulfs (such as Amvrakikos and Maliakos), exhibit a distinct seasonal pattern with consistently higher levels of chlorophyll-a and prolonged growth period compared to the open seas. The proposed phenology atlas represents a useful resource for monitoring phytoplankton growth periods in the EMS, supporting water quality management practices, while enhancing our current comprehension on the relationships between phytoplankton biomass and higher trophic levels (as a food source).
Editor: England: Nature Publishing Group
Idioma: Inglês

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Atlas of phytoplankton phenology indices in selected Eastern Mediterranean marine ecosystems

Kournopoulou, Antonia ; Kikaki, Katerina ; Varkitzi, Ioanna ; Psarra, Stella ; Assimakopoulou, Georgia ; Karantzalos, Konstantinos ; Raitsos, Dionysios E

England: Nature Publishing Group

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