Document of bibliographic reference 363297

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Half-century trends in alpha and beta diversity of phytoplankton summer communities in the Helsinki Archipelago, the Baltic Sea

Abstract

We analyzed phytoplankton biodiversity trends in a 52 year (1967–2018) monitoring time-series from the archipelago of Helsinki, Gulf of Finland, the Baltic Sea. The community ordination revealed strong ordering of samples along the time axis (generalized additive model—gam fit: R² = 0.9). Species richness increased in time and was the most influential alpha diversity descriptor related to the community structure (gam fit: R² = 0.56–0.70). Changes in species richness accounted for 35–36% of the mean between-sample beta diversity. The remaining 64–65% was due to species turnover—the dominant component of the biodiversity trend. The temporal beta diversity trend reflected the eutrophication history of the geographically confined region, with a turning point in mid-1990s demarking the adaptation and recovery phases of the phytoplankton community. Trends in spatial beta diversity revealed homogenization of the communities in the outer archipelago zone, but not in the inner bays. The temporal decay of community similarity revealed high turnover rate, with 23.6 years halving time in the outer archipelago and 11.3 years in the inner bays, revealing the differences in eutrophication strength. The observed phytoplankton trends manifest the regional eutrophication history, and dispersal of new species to the unsaturated brackish species pool.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000856543500001

Bibliographic citation

Olli, K.; Nyman, E.; Tamminen, T. (2023). Half-century trends in alpha and beta diversity of phytoplankton summer communities in the Helsinki Archipelago, the Baltic Sea. J. Plankton Res. 45(1): 146-162. https://dx.doi.org/10.1093/plankt/fbac029

Topic

Marine

Is peer reviewed

true

Access rights

open access

Is accessible for free

true