TY - JOUR

T1 - The new chytridiomycete Paradinomyces triforaminae gen. et sp. nov. co-occurs with other parasitoids during a Kryptoperidinium foliaceum (Dinophyceae) bloom in the Baltic Sea

AU - Reñé, Albert Reñé

AU - Alacid, Elisabet

AU - Vishnyakov, Andrey E.

AU - Seto, Kensuke

AU - Tcvetkova, Victoria S.

AU - Gordi, Jordina

AU - Kagami, Maiko

AU - Kremp, Anke

AU - Garcés, Esther

AU - Karpov, Sergey A.

N1 - Publisher Copyright: © 2022

PY - 2022/12/1

Y1 - 2022/12/1

N2 - A new chytrid genus and species was isolated and cultured from samples obtained in the Baltic Sea during a dinoflagellate bloom event. This species is characterized by having a spherical sporangium without papillae and zoospores of 2–3 µm in diameter that are released through 3 discharge pores. Molecular phylogeny based on ribosomal operon showed its sister position to the Dinomyces cluster in Rhizophydiales. Zoospores lack fenestrated cisternae but contain a paracrystalline inclusion, found in a Rhizophydiales representative for the first time. Additionally, the kinetid features are uncommon for Rhizophydiales and only observed in Dinomyces representatives so far. These morphological features and its phylogenetic relationships justify the description of the new genus and speciesParadinomyces triforaminorum gen. nov. sp. nov. belonging to the family Dinomycetaceae. The chytrid was detected during a high-biomass bloom of the dinoflagellate Kryptoperidinium foliaceum. Laboratory experiments suggest this species is highly specific and demonstrate the impact it can have on HAB development. The chytrid co-occurred with three other parasites belonging to Chytridiomycota (Fungi) and Perkinsea (Alveolata), highlighting that parasitic interactions are common during HABs in brackish and marine systems, and these multiple parasites compete for similar hosts.

AB - A new chytrid genus and species was isolated and cultured from samples obtained in the Baltic Sea during a dinoflagellate bloom event. This species is characterized by having a spherical sporangium without papillae and zoospores of 2–3 µm in diameter that are released through 3 discharge pores. Molecular phylogeny based on ribosomal operon showed its sister position to the Dinomyces cluster in Rhizophydiales. Zoospores lack fenestrated cisternae but contain a paracrystalline inclusion, found in a Rhizophydiales representative for the first time. Additionally, the kinetid features are uncommon for Rhizophydiales and only observed in Dinomyces representatives so far. These morphological features and its phylogenetic relationships justify the description of the new genus and speciesParadinomyces triforaminorum gen. nov. sp. nov. belonging to the family Dinomycetaceae. The chytrid was detected during a high-biomass bloom of the dinoflagellate Kryptoperidinium foliaceum. Laboratory experiments suggest this species is highly specific and demonstrate the impact it can have on HAB development. The chytrid co-occurred with three other parasites belonging to Chytridiomycota (Fungi) and Perkinsea (Alveolata), highlighting that parasitic interactions are common during HABs in brackish and marine systems, and these multiple parasites compete for similar hosts.

KW - Marine chytrids

KW - Dinomycetaceae

KW - Ultrastructure

KW - Molecular phylogeny

KW - Paracrystalline inclusion

KW - host specificity

KW - Host specificity

UR - https://www.sciencedirect.com/science/article/pii/S1568988322001809

UR - http://www.scopus.com/inward/record.url?scp=85142531684&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/2a27878b-2203-387e-9cda-8edefc189b74/

U2 - https://doi.org/10.1016/j.hal.2022.102352

DO - https://doi.org/10.1016/j.hal.2022.102352

M3 - Article

VL - 120

JO - Harmful Algae

JF - Harmful Algae

SN - 1568-9883

M1 - 102352

ER -