Five new species of the nanoflagellatePirsonia in the German Bight, North Sea, feeding on planktic diatoms

Abstract

The structure, development, and host range of five newly detected species of the phagotrophic nanoflagellate Pirsonia are described. They feed on planktic diatoms common in the North Sea: P. verrucosa sp. nov. (on Rhizosolenia delicatula), P. formosa sp. nov. (on Rhizosolenia setigera), P. diadema sp. nov. (on Coscinodiscus granii and C. wailesii), P. eucampiae (on Eucampia zodiacus) and P. mucosa sp. nov. (on Rhizosolenia shrubsolei). The occurrence of resting cysts in Pirsonia guinardiae is reported. The impact of Pirsonia on phytoplankton communities is discussed.

Differential freshwater flagellate community response to bacterial food quality with a focus on Limnohabitans bacteria

“…SA-2.2 cluster or those loosely related to Pirsonia (Figure 5). Although the Oikomonas is considered a bacterivore (Boenigk and Arndt, 2002), the Pirsonia genus has been reported as a diatom feeder in brackish waters (Schnepf and Schweikert, 1997;Kü hn et al, 1996). This overall Flagellate community response to food prey quality K Šimek et al community shift may reflect an increasing proportion of larger flagellates within Stramenopiles ( Figure 5) preying upon smaller and highly abundant Spumella-like HNF that become food limited at t 63 hours (Figure 2).…”

Phagomyxa bellerocheae sp. nov. and Phagomyxa odontellae sp. nov., Plasmodiophoromycetes feeding on marine diatoms

“…Many protists feeding on algae have been overlooked and have only recently been detected (e.g. Kühn 1995;Kühn et al 1996;Elbrächter and Schnepf 1998).…”

Biology of Parasitic Heterotrophic Nanoflagellates: Parasitoids of Diatoms

“…Details of morphological characteristics for all Pirsonia/ Pseudopirsonia species are given in Kühn et al ( 2004 , Table 21.1 ). Based on morphology, a seventh species, P. mucosa (Kühn et al 1996 ), was assigned to this genus, but phylogenetic investigations have revealed its distinct relationship to all other monophyletic Pirsonia species and its transfer to the new genus Pseudopirsonia (Kühn et al 2004 ) within Cercozoa was confessed. The closest relatives to P. mucosa known are Hyphochytrium catenoides and Rhizidiomyces apophysatus within Heterokonta.…”

“…The genus comprises six species, namely P. guinaridae (Schnepf et al 1990 ), P. verrucosa (Kühn et al 1996 ), P. formosa (Kühn et al 1996 ), P. diadema (Kühn et al 1996 ;Kühn 1997Kühn , 1998Kühn and Hofmann 1999 ;Schnepf and Schweikert 1996 ), P. eucampiae (Kühn et al 1996 ) and P. punctigerae (Schweikert and Schnepf 1997a ). Details of morphological characteristics for all Pirsonia/ Pseudopirsonia species are given in Kühn et al ( 2004 , Table 21.1 ).…”

“…Pirsonia species are located within stramenopiles, which is a term that was introduced as a rankless, informal name for heterokont eukaryotes (Patterson 1989 ). This description was emended in the revised classification of Adl et al ( 2012), Cavalier-Smith ( 1998; the stramenopiles were placed Kühn et al ( 1996Kühn et al ( , 2004 within the SAR clade together with the Alveolates and the Rhizaria. The anterior fl agellum possess tripartite, tubular hair-like projections (mastigonemes) and tubular mitochondrial cristae with a central fi lament (Patterson 1989 ) Stramenopiles comprises a huge range of taxa that include, for example, Phaeophyceae, Chrysophycea, Labyrinthulomycota and Bacillariophyceae .…”