32Citations
Citations of this article
47Readers
Mendeley users who have this article in their library.
Get full text

Abstract

Two different phylogenetic groups of picophytoplankton, namely picocyanobacteria and picoeukaryotes, are represented in Lake Kinneret. Three species were isolated from the lake and identified as the picoeukaryote Mychonastes homosphaera and two picocyanobacteria, Synechococcus sp. A and B. Picocyanobacterial and M. homosphaera cultures grew well at light intensities up to 330 and 700 {micro}mol photons m-2 s-1, respectively, but poorly below 10 {micro}mol photons m-2 s-1. Picocyanobacterial and M. homosphaera cultures photoacclimated to low light by increasing their chlorophyll per cell through increase in photosynthetic unit (PSU) size and PSU numbers, respectively. Growth rates of Synechococcus A and B were higher at temperatures characteristic of summer-autumn in the epilimnion, when maximum abundances of picocyanobacteria occur. Growth rates of M. homosphaera were higher at 14{degrees}C, corresponding to lake water temperatures during their occurrence in winter-spring. Temperature is a dominant factor influencing the seasonal dynamics of both picocyanobacteria and picoeukaryotes in Lake Kinneret, while the vertical distribution is controlled by acclimation to different light conditions. Differences in temperature tolerance and photoacclimation suggest that Synechococcus A belongs to picocyanobacteria found in summer below surface waters, while Synechococcus B represents picocyanobacteria found throughout the year at all depths. Photoacclimation to high light as shown in M. homosphaera cultures, may account for the relatively high abundance of picoeukaryotes in surface waters in Lake Kinneret.

Cite

CITATION STYLE

APA

Malinsky-Rushansky, N. (2002). Physiological characteristics of picophytoplankton, isolated from Lake Kinneret: responses to light and temperature. Journal of Plankton Research, 24(11), 1173–1183. https://doi.org/10.1093/plankt/24.11.1173

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free