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A New Heterotrophic Dinoflagellate from the North-Eastern Pacific

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A New Heterotrophic Dinoflagellate from the North-Eastern Pacific The Journal of Published by the International Society of Eukaryotic Microbiology Protistologists Journal of Eukaryotic Microbiology ISSN 1066-5234 ORIGINAL ARTICLE A New Heterotrophic Dinoflagellate from the North-eastern Pacific, Protoperidinium fukuyoi: Cyst–Theca Relationship, Phylogeny, Distribution and Ecology Kenneth N. Mertensa, Aika Yamaguchib,c, Yoshihito Takanod, Vera Pospelovae, Martin J. Headf, Taoufik Radig, Anna J. Pienkowski h, Anne de Vernalg, Hisae Kawamid & Kazumi Matsuokad a Research Unit for Palaeontology, Ghent University, Krijgslaan 281 s8, 9000, Ghent, Belgium b Okinawa Institution of Science and Technology, 1919-1 Tancha, Onna-son, Kunigami, Okinawa, 904-0412, Japan c Kobe University Research Center for Inland Seas, Rokkodai, Kobe, 657-8501, Japan d Institute for East China Sea Research (ECSER), 1-14, Bunkyo-machi, Nagasaki, 852-8521, Japan e School of Earth and Ocean Sciences, University of Victoria, OEASB A405, P. O. Box 1700 STN CSC, Victoria, British Columbia, V8W 2Y2, Canada f Department of Earth Sciences, Brock University, 500 Glenridge Avenue, St. Catharines, Ontario, L2S 3A1, Canada g GEOTOP, UniversiteduQu ebec a Montreal, P. O. Box 8888, Montreal, Qubec, H3C 3P8, Canada h School of Ocean Sciences, College of Natural Sciences, Bangor University, Menai Bridge, Anglesey, LL59 5AB, United Kingdom Keywords ABSTRACT LSU rDNA; round spiny brown cyst; Saanich – Inlet; San Pedro Harbor; single-cell PCR; The cyst theca relationship of Protoperidinium fukuyoi n. sp. (Dinoflagellata, SSU rDNA; Strait of Georgia. Protoperidiniaceae) is established by incubating resting cysts from estuarine sediments off southern Vancouver Island, British Columbia, Canada, and San Correspondence Pedro Harbor, California, USA. The cysts have a brown-coloured wall, and are K. Mertens, Research Unit for Palaeontolo- characterized by a saphopylic archeopyle comprising three apical plates, the gy, Ghent University, Krijgslaan 281 s8, apical pore plate and canal plate; and acuminate processes typically arranged in 9000 Ghent, Belgium linear clusters. We elucidate the phylogenetic relationship of P. fukuyoi through Telephone number: +32-9-264-4609; large and small subunit (LSU and SSU) rDNA sequences, and also report the FAX number: +32-9-264-4608; SSU of the cyst-defined species Islandinium minutum (Harland & Reid) Head e-mail: [email protected] et al. 2001. Molecular phylogenetic analysis by SSU rDNA shows that both species are closely related to Protoperidinium americanum (Gran & Braarud Received: 31 January 2013; revised 3 April 1935) Balech 1974. Large subunit rDNA phylogeny also supports a close rela- 2013; accepted April 3, 2013. tionship between P. fukuyoi and P. americanum. Three subgroups in total are further characterized within the Monovela group. The cyst of P. fukuyoi shows doi:10.1111/jeu.12058 a wide geographical range along the coastal tropical to temperate areas of the North-east Pacific, its distribution reflecting optimal summer sea-surface temperatures of ~14–18 °C and salinities of 22–34 psu. FREE-LIVING marine dinoflagellates comprise a diverse palaeontologists and based on resting cyst morphology. group of organisms, currently encompassing approxi- Linking both stages is important for both biological and mately 1,555 species (Gomez 2005). In addition to a geological studies. This was traditionally established by motile stage, some dinoflagellates produce resting cysts incubating living cysts and identifying the emergent motile as part of their life cycle, allowing them to endure unfa- stage (e.g. Wall and Dale 1968). Molecular analyses are vourable environmental conditions. Resting cysts are now an important additional tool, utilizing the polymerase assumed to be hypnozygotes based on the relatively few chain reaction (PCR) technique either on single cells or species for which this has been confirmed (e.g. Figueroa single cysts (e.g. Bolch 2001; Matsuoka and Head in et al. 2011; von Stosch 1973), and resting cysts are press; Matsuoka et al. 2006; Takano and Horiguchi 2006). usually the only geologically preservable stage in the dino- Some cysts are brown in colour with a distinct spheroi- flagellate life cycle. The existence of these two life cycle dal, process-bearing shape and are therefore informally stages has resulted in the creation of two taxonomic designated as round brown spiny cysts (Radi et al. 2013). systems: one used by biologists and based on the mor- Two cyst-defined genera, using palaeontological nomen- phology of living motile cells, and the other developed by clature, presently accommodate these species. Cysts © 2013 The Author(s) Journal of Eukaryotic Microbiology © 2013 International Society of Protistologists Journal of Eukaryotic Microbiology 2013, 60, 545–563 545 New Dinoflagellate Protoperidinium fukuyoi Mertens et al. belonging to the genus Echinidinium Zonneveld 1997 inferred by SSU rDNA show that it is closely related to ex Head et al. 2001 are characterized by a theropylic Protoperidinium americanum, Protoperidinium fusiforme, archeopyle (Head et al. 2001), i.e. an angular slit that fol- Protoperidinium parthenopes, P. tricingulatum and the lows plate boundaries but without complete release of cyst-defined species I. minutum. By quantitatively docu- plates (Matsuoka 1988). Cysts belonging to the genus Is- menting the cyst in surface sediments and sediment landinium Head et al. 2001 open with a saphopylic arche- traps, we show its wide distribution along the northwest opyle, which is defined as having a free operculum American margin. (Matsuoka 1988). At the species level, process (spine), characteristics (hollow or solid, size, lateral profile, surface MATERIALS AND METHODS ornamentation including striations or spinules, heterogene- ity, density of distribution) and wall texture (granular to Incubation studies were performed by K.N.M. at the Insti- smooth) are important attributes for distinguishing species tute for East China Sea Research at Nagasaki University. (e.g. Head 2003; Head et al. 2001; Mertens et al. 2012a; Molecular work was carried out at the same location by Pospelova and Head 2002; Radi et al. 2013; Zonneveld Y.T. and H.K. Palynological work was conducted by V.P., 1997). T.R. and M.J.H. at the University of Victoria, GEOTOP, Cyst–motile stage relationships have been established and Brock University, respectively. for very few species producing round brown spiny cysts, these being: Diplopelta parva (Matsuoka 1988), Protoperi- Germination experiments dinium monospinum (Zonneveld & Dale 1994), Oblea acanthacysta (Kawami et al. 2006), Protoperidinium tricin- To obtain cysts of P. fukuyoi n. sp. for incubation studies, gulatum (Kawami et al. 2009), and several cyst morpho- surface sediment samples containing round brown spiny types of Archaeperidinium minutum (Mertens et al. 2012a; cysts were collected at three locations around southern Ribeiro et al. 2010) and the closely related species Archae- Vancouver Island, British Columbia, Canada, in October peridinium saanichi (both reviewed in Mertens et al. 2011: (1) Patricia Bay, Saanich Inlet (site A), (2) Brentwood 2012a). Archaeperidinium minutum was previously called Bay, Saanich Inlet (site B), and (3) central Strait of Georgia Protoperidinium minutum, the genus Archaeperidinium (site C) and two locations around San Pedro Harbor, having been reinstated by Yamaguchi et al. (2011) based California, USA (sites E and F) (Table 1 and Fig. S1). The on morphological and phylogenetic observations. No studied cyst type had been previously identified as “cyst cyst-defined names have been erected for any of these type A” in the following North Pacific settings: the Strait motile-stage defined species, mostly to avoid unnecessary of Georgia (Pospelova et al. 2010; Radi et al. 2007), taxonomic complexity. However, with the advent of coastal bays of southern Vancouver Island (Krepakevich molecular techniques, it has become increasingly apparent and Pospelova 2010), Saanich Inlet (Price and Pospelova that cyst characteristics such as the archeopyle (e.g. 2011), the Santa Barbara Basin (Bringue et al. 2013; Matsuoka 1988; Matsuoka and Head in press) and thecal Pospelova et al. 2006), and off Mexico (Limoges et al. characteristics including details of the sulcal plates – as 2010). All samples were stored in plastic bags in a refrig- suggested early by Abe (1936) and more recently by erator at 4 °C. In situ sea-surface salinities (SSSs) and Matsuoka and Kawami (in press) – are of primary impor- sea-surface temperatures (SSTs) were measured when tance in grouping species. collecting samples (Table S1). In addition to their taxonomic interest, these round About 0.5–1.0 cm3 of wet sediment was immersed in fil- brown spiny cysts are important for palaeoclimatological tered seawater and, after 1 min of ultrasonication using an studies because their distributions are related to tempera- As OneTM (As One Corp., Osaka, Japan) US2R ultrasonic ture, salinity, trophic state and sea-ice cover (Radi et al. bath, the sediment was rinsed through a 20 lm metallic- 2013; Zonneveld et al. 2013). Some species, notably meshed calibrated SanpoTM (Sanpo, Tokyo, Japan) sieve Echinidinium karaense, Islandinium minutum and Islandini- using filtered seawater. From this residue, the cyst fraction um? cezare s.l., have distinct cold-water distributions was separated using the heavy-liquid sodium polytungstate (Head et al. 2001) and have been associated with sea-ice at a density of 1.3 g/cm (Bolch 1997). Single cysts were cover (e.g. Radi et al. 2013). Recent molecular
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