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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Clonal Didinium nasutum previously reared on either Paramecium aurelia, P. bursaria (normal and apochlorotic zoochlorellae-containing stocks), P. caudatum, or P. multi-micronucleatum were presented with either 15 cells each of normal or apochlorotic P. bursaria or 30 cells of either stock in 1 ml depression slides. Prey-choice, search period and handling (=ingestion) times were recorded. Didinia chose apochlorotic prey twice as often as normal paramecia. They located and attacked apochlorotic cells more rapidly than normal prey, and they ingested ‘bleached’ paramecia more quickly than normal cells. There was a consistent pattern of relatively increased search and handling times for primary control didinia reared on paramecia other than P. bursaria, compared with the experimental predators. The frequency distributions of both search and handling times were normal. Predatory efficiency of didinia attacking apochlorotic paramecia was significantly greater (> 10 times) than that exhibited for normal cells as measured by the escape frequency of prey. Similarly, the greatest loss of zoochlorellae by regurgitation or premature defecation occurred after normal prey were ingested. These results support the hypothesis that the mutualistic zoochlorellae within P. bursaria tend to discourage predation by D. nasutum by releasing distasteful metabolites that repel them. The reciprocal nature of this ciliatezoochlorella symbiosis includes a protective function for the latter partner.

Feeding Behaviour of Didinium nasutum on Paramecium bursaria with Normal or Apochlorotic Zoochlorellae