Spatio-temporal dynamics of phytoplankton functional groups in the South China Sea and their relative contributions to marine primary production

The sea-surface distribution of four phytoplankton functional groups in the South China Sea (SCS) namely Coccolithophores (Coc), Diatoms (Dia), Cyanobacteria (Cya) and Chlorophytes (Chlo) was studied across spatial and temporal scales. The time-series datasets derived from the National Aeronautic and Space Administration (NASA) Ocean Biogeochemical Model and retrieved via the Giovanni Portal were analysed statistically with well-known methods including Pearson's correlation coefficient, ordinary least square regression (OLR), Maximum Entropy Spectral Analysis (MESA) and Principal Components Analysis (PCA). The data were analysed for relative abundance, seasonality, cyclicity, long-term trends, spatial variability, inter-relationships, and relative contributions of individual phytoplankton groups to primary production (PP, using Chl-a as a proxy). The results reveal that the numerically dominant phytoplankton group in terms of relative abundance is Cya, comprising about 57% of the planktonic biomass, followed closely by Coc (about 40%), while Dia constitutes almost 3% of the total abundance. Dia was found to have the strongest annual cycle, and hence displayed the highest rate of seasonal variability. Clear spatial segregation patterns have also been uncovered; Coc and Dia are strongly correlated in the Northern SCS (NSCS) while Cya dominate in Southern SCS (SSCS). Coc and Dia display a strong positive correlation with PP, whereas the seasonal relationships between Cya and Chlo with PP are non-linear, and hence appear statistically non-significant. The rise in the trend of Cya and decrease in Coc, since 2004, may be indicative of changes in successional patterns of phytoplankton functional groups in the SCS. This study, therefore, sets the precedence for more robust research to uncover the immediate and remote causes of the observed spatiotemporal changes in marine phytoplankton dynamics and to develop predictive models of marine primary productivity (MPP) and ecological health. © 2019

Dergi Adı Regional Studies in Marine Science
Dergi Cilt Bilgisi 29
Sayfalar -
Yayın Yılı 2019
Eser Adı
[dc.title]
Spatio-temporal dynamics of phytoplankton functional groups in the South China Sea and their relative contributions to marine primary production
Yazar
[dc.contributor.author]
Ndah A.B.
Yazar
[dc.contributor.author]
Dagar L.
Yazar
[dc.contributor.author]
Becek K.
Yazar
[dc.contributor.author]
Odihi J.O.
Yayın Yılı
[dc.date.issued]
2019
Yayıncı
[dc.publisher]
Elsevier B.V.
Yayın Türü
[dc.type]
article
Özet
[dc.description.abstract]
The sea-surface distribution of four phytoplankton functional groups in the South China Sea (SCS) namely Coccolithophores (Coc), Diatoms (Dia), Cyanobacteria (Cya) and Chlorophytes (Chlo) was studied across spatial and temporal scales. The time-series datasets derived from the National Aeronautic and Space Administration (NASA) Ocean Biogeochemical Model and retrieved via the Giovanni Portal were analysed statistically with well-known methods including Pearson's correlation coefficient, ordinary least square regression (OLR), Maximum Entropy Spectral Analysis (MESA) and Principal Components Analysis (PCA). The data were analysed for relative abundance, seasonality, cyclicity, long-term trends, spatial variability, inter-relationships, and relative contributions of individual phytoplankton groups to primary production (PP, using Chl-a as a proxy). The results reveal that the numerically dominant phytoplankton group in terms of relative abundance is Cya, comprising about 57% of the planktonic biomass, followed closely by Coc (about 40%), while Dia constitutes almost 3% of the total abundance. Dia was found to have the strongest annual cycle, and hence displayed the highest rate of seasonal variability. Clear spatial segregation patterns have also been uncovered; Coc and Dia are strongly correlated in the Northern SCS (NSCS) while Cya dominate in Southern SCS (SSCS). Coc and Dia display a strong positive correlation with PP, whereas the seasonal relationships between Cya and Chlo with PP are non-linear, and hence appear statistically non-significant. The rise in the trend of Cya and decrease in Coc, since 2004, may be indicative of changes in successional patterns of phytoplankton functional groups in the SCS. This study, therefore, sets the precedence for more robust research to uncover the immediate and remote causes of the observed spatiotemporal changes in marine phytoplankton dynamics and to develop predictive models of marine primary productivity (MPP) and ecological health. © 2019
Kayıt Giriş Tarihi
[dc.date.accessioned]
2019-12-23
Açık Erişim Tarihi
[dc.date.available]
2019-12-23
Yayın Dili
[dc.language.iso]
eng
Konu Başlıkları
[dc.subject]
Functional groups
Konu Başlıkları
[dc.subject]
Marine primary production
Konu Başlıkları
[dc.subject]
Phytoplankton
Konu Başlıkları
[dc.subject]
South china sea
Konu Başlıkları
[dc.subject]
Spatiotemporal dynamics
Haklar
[dc.rights]
info:eu-repo/semantics/closedAccess
ISSN
[dc.identifier.issn]
2352-4855
Dergi Adı
[dc.relation.journal]
Regional Studies in Marine Science
Dergi Cilt Bilgisi
[dc.identifier.volume]
29
Tek Biçim Adres
[dc.identifier.uri]
https://dx.doi.org/10.1016/j.rsma.2019.100598
Tek Biçim Adres
[dc.identifier.uri]
https://hdl.handle.net/20.500.12628/7591
Görüntülenme Sayısı ( Şehir )
Görüntülenme Sayısı ( Ülke )
Görüntülenme Sayısı ( Zaman Dağılımı )
Görüntülenme
23
09.12.2022 tarihinden bu yana
İndirme
1
09.12.2022 tarihinden bu yana
Son Erişim Tarihi
23 Şubat 2024 06:45
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phytoplankton relative spatial abundance groups correlation patterns variability changes seasonal functional primary analysed statistically Analysis marine strongly uncovered correlated (NSCS) Northern displayed (about constitutes almost strongest annual Southern highest segregation dominate (SSCS) spatiotemporal robust research
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