Data interpretation of principal component and diatom analyses of Holocene sediments from Ptichye Lake (Southern Primorye)

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Abstract

The diatom flora of the middle Holocene sediments from Ptichye Lake, located on the southern coast of Primorye, was studied through the principal component analysis to determine the main paleoeological factors affecting the species distribution. Multivariate analysis of the diatom taxa matrix enabled us to determine three principal components accounting for 78% of the variance, thus proving the analysis to be highly efficient. The first component explains the most variance (58%) and has high values associated with the Boreal neritic species of Actinoptychus senarius Ehrenberg (Ehrenberg). Comparing the results of diatom and principal component analyses, on the one hand, and lithological analysis, on the other hand, we identified the changes in diatom paleocommunities that occurred as transgression was being replaced by regression during the middle Holocene.

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About the authors

Ekaterina A. Elbakidze

Far East Geological Institute, FEB RAS

Author for correspondence.
Email: ekato21@mail.ru
ORCID iD: 0009-0009-3241-4420

Junior Researcher

Russian Federation, Vladivostok

Alexandra V. Romanova

Far East Geological Institute, FEB RAS

Email: sandra_ru@bk.ru
ORCID iD: 0000-0003-2884-1197

Candidate of Sciences in Geology and Mineralogy, Senior Researcher

Russian Federation, Vladivostok

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Supplementary files

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2. Fig. 1. Location of the studied core Tb-5: Lake Ptichye in South Primorye

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3. Fig. 2. Results of principal component analysis (PCA) applied to the matrix of diatom percentages from the Holocene sediments of Lake Ptichye. Component 1 corresponds to the x-axis, component 2 corresponds to the y-axis

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4. Fig. 3. Distribution of taxon loadings obtained using PCA for three principal components

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5. Fig. 4. Diatom species with high positive loadings as a result of PCA: 1 – Thalassiosira angulata (Gregory) Hasle; 2 – Thalassiosira aculeata Proshkina-Lavrenko; 3 – Tryblionella compressa (Bailey) Poulin; 4, 6 – Aulacoseira praegranulata (Jousé) Simonsen; 5 – Epithemia adnata (Kützing) Brébisson; 7–9 – Chaetoceros ssp.; 10 – Actinoptychus senarius Ehrenberg (Ehrenberg); 11 – Diploneis smithi (Brébisson) Cleve; 12 – Odontella aurita (Lyngbye) Agardh; 13, 14 – Melosira nummuloides Agardh. Scale bar – 10 µm

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6. Fig. 5. Distribution of representatives of ecological groups, species with significant component loads, and distribution of eigenvalues of three principal components with a trend line, obtained for core Tb-5. Legend, lithology: 1 – sand; 2 – fine-grained silty sand; 3 – silty-pelitic clay; 4 – mollusk shells (a) and their fragments (b). MN – marine neritic species, MSP – marine sublittoral planktonic, MSB – marine sublittoral benthic

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