The light and temperature dependence of growth rate and elemental composition of Phaeocystis globosa scherffel and P. Pouchetii (HAR.) Lagerh. in batch cultures

Jahnke, J.

doi:10.1016/0077-7579(89)90038-0

Cited by 68 publications

(45 citation statements)

References 24 publications

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“…Thus, dominance of diatoms was prolonged and subsequently the concentration of phosphate was reduced when P. globosa biomass finally developed (Jahnke 1989, Egge & Aksnes 1992. Another reason might be that the reduced mean water irradiance during the bloom period in 2004 (due to substantial cloud cover), limited colony formation (Peperzak 1993) and thus lowered P. globosa biomass.…”

Section: Discussionmentioning

confidence: 99%

Virally induced mortality of Phaeocystis globosa during two spring blooms in temperate coastal waters

Baudoux¹,

Noordeloos²,

Veldhuis³

et al. 2006

Aquat. Microb. Ecol.

106

126

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This study reports virally mediated mortality rates of Phaeocystis globosa single cells in the southern North Sea during 2 consecutive spring blooms (2003 and 2004). An adapted dilution method was used to estimate viral lysis and microzooplankton grazing simultaneously. Parallel dilution experiments were performed with 30 kDa ultrafiltrate (virus and grazer-free diluent) and 0.2 µm filtered seawater (grazer-free, but virus-containing diluent). Specific viral lysis rates were calculated from the difference in P. globosa growth rates between the 2 dilution series after 24 h incubation under natural conditions. The validity of this method was tested using a culture of P. globosa infected with a known P. globosa virus (PgV). The field data show that virally induced mortality can be a substantial loss factor for P. globosa single cells (up to 0.35 d ). Viral lysis was the major cause of total P. globosa cell lysis. Assuming no loss due to sinking, viral lysis accounted for 5 to 66% of the total mortality of P. globosa single cells. Viral lysis and total putative PgV abundance increased concomitantly with abundance of P. globosa single cells whilst the increase in infective PgV was delayed. This delay may be caused by the formation of transparent exopolymeric particles that are generated when P. globosa colonies disrupt and are known to passively adsorb viruses. Viruses and microzooplankton were shown to be major controlling agents of P. globosa single cells, although their relative significance varied over the course of the bloom and between years.

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Section: Discussionmentioning

confidence: 99%

Virally induced mortality of Phaeocystis globosa during two spring blooms in temperate coastal waters

Baudoux¹,

Noordeloos²,

Veldhuis³

et al. 2006

Aquat. Microb. Ecol.

106

126

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“…We found that these 2 coldwater species did not grow at temperatures below 4 and 0°C, respectively. However, it has been reported that P. pouchetii grew at 2°C and P. antarctica grew at -2°C (Jahnke 1989). In addition, P. antarctica is routinely found actively growing at an in situ temperature of -1.8°C (e.g.…”

Section: Global Distributionmentioning

confidence: 99%

“…For example, P. antarctica releases more dimethyl sulfide at lower temperatures . Furthermore, the cellular carbon content of P. pouchetii is greater at low than at high temperatures (Jahnke 1989), and solitary cells of P. pouchetii have higher photosynthetic and excretion rates than colonial cells at low temperatures (Verity et al 1991). The carbon to chlorophyll a (chl a) ratio and cell size of P. pouchetii solitary cells vary inversely with temperature, whereas colonial photosynthesis is positively related to temperature (Verity et al 1991).…”

Section: Introductionmentioning

confidence: 99%

Temperature effects on growth, colony development and carbon partitioning in three Phaeocystis species

Wang¹,

Tang²,

Wang³

et al. 2010

Aquat. Biol.

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ABSTRACT:Phaeocystis is an ecologically important marine phytoplankton genus that is globally distributed. We examined the effects of temperature on the 3 most common species: P. globosa, P. antarctica, and P. pouchetii, which grew at 16-32, 0-6, and 4-8°C, respectively. P. pouchetii did not form colonies; P. globosa formed colonies at 16, 20, and 24°C, and P. antarctica colonies were observed at all temperatures. More cells were partitioned into the colonial form at lower temperatures than at higher temperatures for P. globosa and P. antarctica. P. globosa colony size decreased with temperature, whereas P. antarctica colony size showed no distinct response to temperature. Numbers of cells per unit of colony surface area of P. globosa and P. antarctica were lowest at temperatures where highest growth rates and colonial abundances were observed; more organic carbon was partitioned into solitary cell biomass at higher temperatures, whereas the carbon concentration of colonies was not affected by temperature. Maximum quantum yield of P. antarctica and P. globosa exhibited subtle responses to temperature, whereas that of P. pouchetii was relatively invariant within the growth temperature range. Future changes in sea surface temperature may dramatically alter the ecology and biogeochemical cycles of systems dominated by Phaeocystis spp. and result in further degradation, via oxygen depletion and altered food web structure. KEY WORDS: Phaeocystis spp. · Temperature · Colony formation · Carbon partitioningResale or republication not permitted without written consent of the publisher

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“…to avoid confusion. Baumann and Jahnke (1986), Jahnke andBaumann (1986, 1987) and Jahnke (1989) regarded this as over-simpliWcation. Their observations on colony shape maintenance in long term culture showed that both juvenile and older stages of P. globosa and P. pouchetii were distinct and these data supported the recognition of the two entities as separate species.…”

Section: Introductionmentioning

confidence: 99%

A taxonomic review of the genus Phaeocystis

Medlin¹,

Zingone²

2007

Phaeocystis, Major Link in the Biogeochemical Cycling of Climate-Relevant Elements

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Phaeocystis is recognized both as a nuisance and as an ecologically important phytoplankton species. Its polymorphic life cycle with both colonial and Xagellated cells causes many taxonomic problems. Sequence variation among 22 isolates representing a global distribution of the genus has been compared using three molecular markers. The ribulose-1,5-bisphosphate carboxylase/oxygenase (RUBISCO) spacer is too conserved to resolve species. The most conserved 18S ribosomal deoxyribonucleic acid (rDNA) analysis suggests that an undescribed unicellular Phaeocystis sp. (isolate PLY559) is a sister taxon to the Mediterranean unicellular Phaeocystis jahnii; this clade branched prior to the divergence of all other Phaeocystis species, including the colonial ones. The internal transcribed spacer (ITS) region shows suYcient variation that some spatial population structure can be recovered, at least in P. antarctica. P. globosa and P. pouchetii have multiple diVerent ITS copies, suggestive of cryptic species that are still able to hybridize. A molecular clock has been constructed that estimates the divergence of the cold water colonial forms from the warm-water colonial forms to be about 30 Ma and the divergence of P. antarctica and P. pouchetii to be about 15 Ma. A short description of the colonial stage and the Xagellated stage for each formally recognized species is provided. Morphological information is also provided on a number of undescribed species. These include the strain Ply 559, consisting of non-colonial cells with peculiar tubular extrusomes, a second non-colonial species from the north western Mediterranean Sea producing a lot of mucus, and a colonial species with scale-less Xagellates found in Italian waters. In addition, three Xagellated morphotypes with scales diVerent from those of P. antarctica were reported in the literature from Antarctic waters. The picture emerging from both molecular and morphological data is that the number of species in the genus is still underestimated and that cryptic or pseudocryptic diversity requires a sound assessment in future research of this genus. Based on all published observations, an emended description of the genus is provided.

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The light and temperature dependence of growth rate and elemental composition of Phaeocystis globosa scherffel and P. Pouchetii (HAR.) Lagerh. in batch cultures

Cited by 68 publications

References 24 publications

Virally induced mortality of Phaeocystis globosa during two spring blooms in temperate coastal waters

Virally induced mortality of Phaeocystis globosa during two spring blooms in temperate coastal waters

Temperature effects on growth, colony development and carbon partitioning in three Phaeocystis species

A taxonomic review of the genus Phaeocystis

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