English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Myrionecta rubra is a cosmopolitan estuarine and neritic ciliate, known to cause 'red- water' blooms. The current study was conducted to achieve a better understanding of the relationship of photosynthetic performance and growth with feeding on cryptophyte algae in M. rubra. During the experiment the cryptophyte Teleaulax acuta was introduced for 2 consecutive growth periods (14 d each) and the cultures were then starved during 4 additional periods. In both high light (HL) and low light (LL) treatments, a significant decrease in per capita growth rates (µ) was observed over time (p < 0.05) in the absence of new prey. In the LL treatment, chlorophyll a content (chl a cell -1 ), photosyn- thetic capacity (Pmax (cell)), and photosynthetic efficiency (αcell) increased after feeding and then declined during starvation. In the HL treatment, chl cell -1 and αcell also increased and then declined after feeding; however, Pmax (cell) showed only a slight decrease with starvation. In both treatments, M. rubra appeared to undergo an acclimation-like response following declines in chl cell -1 , with increases in Pmax (chl) and the light saturation parameter (Ik). While photosynthetic efficiency declined during starvation, overall photosynthetic capacity appeared to become uncoupled with growth over time. M. rubra demonstrated a high capacity for chl production (7 to 10 µg chl a ml -1 d -1 ) after feed- ing, which decreased during starvation. Declines in growth and photosynthetic parameters coincided with the loss of prey nuclei from M. rubra cells, implicating a possible functional role for retained prey nuclei. These data show that M. rubra can function phototrophically for extended periods without ingesting prey, but that feeding is periodically required for optimal growth and photosynthe- sis, especially in high light.

Role of feeding in growth and photophysiology of Myrionecta rubra