Search results for "amebat"
showing 3 items of 3 documents
Trapping the Enemy: Vermamoeba vermiformis Circumvents Faustovirus Mariensis Dissemination by Enclosing Viral Progeny inside Cysts
2019
Viruses depend on cells to replicate and can cause considerable damage to their hosts. However, hosts have developed a plethora of antiviral mechanisms to counterattack or prevent viral replication and to maintain homeostasis. Advantageous features are constantly being selected, affecting host-virus interactions and constituting a harsh race for supremacy in nature. Here, we describe a new antiviral mechanism unveiled by the interaction between a giant virus and its amoebal host. Faustovirus mariensis infects Vermamoeba vermiformis, a free-living amoeba, and induces cell lysis to disseminate into the environment. Once infected, the cells release a soluble factor that triggers the encystment…
Testate amoebae as a potential tracer of organic matter dislodged from peat extraction areas
2020
In the boreal zone, surface waters mostly receive external organic matter (OM) from surrounding peatlands. The lake’s biological communities may respond to changes in OM inputs caused by anthropogenic activities in the catchment. Testate amoebae (TA) possess an outer shell that preserves well in lake sediments and are commonly used in paleo-environmental studies. Additionally, they fall into the size range of particles transported from peatlands to lakes, making them potential particle tracers. Here, we compared TA communities of current and pre-peat extraction sediments from lakes receiving OM only from peat extraction areas (impact lakes) with lakes receiving OM from peatlands under other…
Turvemaiden maankäytön vaikutukset kuoriameebayhteisöihin
2013
Turvemaiden maankäytöllä on todettu olevan monenlaisia ympäristövaikutuksia, kuten esimerkiksi kasvihuoneilmiötä vauhdittavat kaasupäästöt (esim. CO2 & CH4), turvetuotannon vesistövaikutukset ja turpeenpolton päästöt. Lisäksi turvemaiden maankäytöllä on vahvoja vaikutuksia soihin. Maankäytön ympäristövaikutusten arvioinnissa on käytetty apuna monia eliöryhmiä, esimerkiksi pohjaeläimiä, eläinplanktonia ja kaloja. Kuoriameebat (Testacea) ovat ryhmä pieniä, lajistoltaan monimuotoisia ja laajalle levinneitä yksisoluisia eliöitä. Ne ovat pääasiallisesti akvaattisia eliöitä, ja niitä esiintyy muun muassa turvemailla, kosteikoissa ja järvissä. Kuoriameebat sopivat erityisesti turvemaassa tapahtuvi…