Living in a Phaeocystis colony: a way to be a successful algal species

Veldhuis, Marcel J.W.; Brussaard, Corina P. D.; Noordeloos, Anna A. M.

doi:10.1016/j.hal.2004.12.013

Cited by 39 publications

(23 citation statements)

References 55 publications

(66 reference statements)

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“…3). These periods match the range of latent periods for all characterized phytoplankton viruses so far, and are somewhat shorter or comparable to the maximum growth rates of their host (Schoemann et al 2005;Veldhuis et al 2005). Based on the decline in the algal host population and the increase in extracellular virus particles, a conservative estimate of the burst size (number of viruses released per host cell that underwent lysis) can be estimated.…”

Section: Isolation and Characterization Of Viruses Infecting Phaeocystissupporting

confidence: 55%

Phaeocystis and its interaction with viruses

et al. 2007

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Over the years, viruses have been shown to be mortality agents for a wide range of phytoplankton species, including species within the genus Phaeocystis (Prymnesiophyceae). With its polymorphic life cycle, its worldwide distribution, and the capacity of several of the Phaeocystis species to form dense blooms, this genus is a key player for our understanding of biogeochemical cycling of elements. This paper provides an overview of what is know to date about the ecological role of viruses in regulating Phaeocystis population dynamics. It explores which variables aVect the algal host-virus interactions, and examines the impact of virally induced cell lysis of Phaeocystis on the function and structure of the pelagic food web as well as on the Xow of organic carbon and nutrients.

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Section: Isolation and Characterization Of Viruses Infecting Phaeocystissupporting

confidence: 55%

Phaeocystis and its interaction with viruses

et al. 2007

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“…However, colonial and solitary cells have been shown in other studies to have similar growth rates (Hamm, 2000;Jakobsen & Tang, 2002), suggesting that colonial mucus production does not represent a significant energy drain for P. globosa nor result in a reduced growth rate of colonial cells. In our cultures, the growth rates of colonial cells were even higher than those of solitary cells, similar to the finding of Shields & Smith (2009) and Veldhuis et al (2005). Because the different morphotypes of Phaeocystis have very different trophic roles (e.g.…”

Section: Nitrate Load Within Marine Systems Dominated By Phaeocystissupporting

confidence: 89%

The role of nitrogen on the growth and colony development ofPhaeocystis globosa(Prymnesiophyceae)

Wang¹,

Wang²,

Smith³

2011

European Journal of Phycology

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The effects of nitrate, ammonium and urea on the growth and colony formation of three strains of Phaeocystis globosa were investigated. Although ammonium and urea supported growth, nitrate was the favoured nitrogen source for the growth of solitary cells for all three strains. Phaeocystis globosa CCMP 1528 and 629 formed colonies in all cultures where nitrate was the sole nitrogen source, but only a few colonies were observed in ammonium and urea treatments. Ammonium and urea were far less effective in supporting growth, biomass generation and colony formation in all three strains. Once colonies developed, colonial cells accounted for at least 15% of the total cells when grown with nitrate; colonial chlorophyll also contributed up to 60% to the total chlorophyll. The growth rates of colonial cells when using nitrate were greater than solitary cells. Changes in colony size, colonial cell abundance and total P. globosa abundance as affected by the nitrogen source may influence the carbon flux within the pelagic food web.

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“…4). One consists of mitotic division of colonial cells within the colony, i.e., colony growth (Kornmann 1955;Rousseau et al 1994;Veldhuis et al 2005). This process can lead to colony division and budding as observed in mesocosms (Verity et al 1988a) and in the Weld ) but seems to be of minor importance.…”

Section: Vegetative Reproduction In P Globosamentioning

confidence: 99%

“…The colony matrix was shown to act as an energy (Lancelot and Mathot 1985;Veldhuis and Admiraal 1985;Lancelot and Rousseau 1994) and nutrient (Fe and Mn;Schoemann et al 2001) reservoir. This provides a competitive advantage to P. globosa colonies when resources are limiting (Lancelot and Rousseau 1994;, and when nitrate is the nitrogen source (Lancelot et al 1998), allowing higher growth rates than free-living cells (Peperzak et al 2000b;Veldhuis et al 2005). On the other hand, some advantages of being a free-living cell are related to a greater ability to compete under ammoniumand phosphate-limited conditions (Veldhuis et al 1991;Riegman et al 1992), reduced nutrient uptake (Ploug et al 1999), and alternative nutritional modes such as phagotrophy (Verity and Medlin 2003).…”

Section: The Ecological Relevance Of the Haploid-diploid Life Cycle Omentioning

confidence: 99%

The life cycle of Phaeocystis: state of knowledge and presumptive role in ecology

Rousseau,

Chrétiennot-Dinet,

Jacobsen

et al. 2007

Biogeochemistry

126

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Despite numerous investigations, the number and role of morphotypes involved in the life cycle of Phaeocystis species remain under debate. This is partly due to the application of diVerent methodologies such as light, transmission, scanning electron microscopy and Xow cytometry on speciWc samples. This heterogeneity of approaches results in the incomplete morphometric description of the diVerent cell types existing within one species according to relevant criteria and the indetermination of the ploidy level of each observed stage. We review here the diVerent morphotypes observed within each of the six Phaeocystis species recognized up to now. Four diVerent cell types have been observed. In common to all six species is the occurrence of a scaly Xagellate producing star-forming Wlaments (all species except P. jahnii) or not (P. globosa and P. jahnii). In three colony-forming species, P. globosa, P. pouchetii and P. antarctica, three morphotypes are observed: a Xagellate with scales and Wlaments, a colonial cell, and a Xagellate devoid of scales and Wlaments. In the non-colonyforming species, P. scrobiculata and P. cordata, only Xagellates with scales and Wlaments have been observed. While suspected in P. pouchetii and P. antarctica, a haploid-diploid life cycle has only been evidenced for P. globosa. The two main prominent features of this cycle are that sexuality is prevalent in colony bloom formation and termination and that two types of vegetative reproduction exist. The ecological relevance of alternating haploid and diploid stages is not clearly apparent on the basis of existing ecological studies.

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Living in a Phaeocystis colony: a way to be a successful algal species

Cited by 39 publications

References 55 publications

Phaeocystis and its interaction with viruses

Phaeocystis and its interaction with viruses

The role of nitrogen on the growth and colony development ofPhaeocystis globosa(Prymnesiophyceae)

The life cycle of Phaeocystis: state of knowledge and presumptive role in ecology

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