Buoyancy in Phaeocystis pouchetii (Hariot) Lagerheim

Skreslet, Stig

doi:10.1016/0022-0981(88)90230-4

Cited by 24 publications

(15 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Blooms of P. pouchetii typically comprise the colonial form, although there are a few reports of blooms of solitary P. pouchetii cells (Wassmann et al 2005). Colony formation could be a means to escape predation (Fernández et al 1992), to control buoyancy in order to keep cells in the upper layers of the euphotic zone (Skreslet 1988) or to avoid viral infection (e.g. Bratbak et al 1998).…”

Section: Abstract: Nitrogen Uptake · Mesocosm Experiments · Phaeocysmentioning

confidence: 99%

See 1 more Smart Citation

Phytoplankton and bacterial uptake of inorganic and organic nitrogen during an induced bloom of Phaeocystis pouchetii

Sanderson¹,

Bronk²,

Nejstgaard³

et al. 2008

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

Section: Abstract: Nitrogen Uptake · Mesocosm Experiments · Phaeocysmentioning

confidence: 99%

“…Bratbak et al 1998, Jacobsen et al 2007. It is also hypothesized that colony formation may assist in buoyancy control, keeping cells in the upper layers of the euphotic zone (Skreslet 1988). During the colonial period of the bloom, large differences between the control and nutrient-amended mesocosms became apparent.…”

Section: Phaeocystis Pouchetii Bloommentioning

confidence: 99%

Phytoplankton and bacterial uptake of inorganic and organic nitrogen during an induced bloom of Phaeocystis pouchetii

Sanderson¹,

Bronk²,

Nejstgaard³

et al. 2008

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

“…Positive buoyancies have been observed for Phaeocystis colonies ( Table 1). Reported maximum ascendance rate of the colonies ranges from 0.1 to as *Address correspondence to this author at the Research Center for Harmful Algae and Aquatic environment, Jinan University, Guangzhou 510632, China; Tel: +86 152 6426 7458; E-mail: pouchetii@gmail.com high as 24 m d -1 [18,21]. However, negative colonial buoyancy has also been reported, even in the same study where positive buoyancy was noted [21].…”

Section: Introductionmentioning

confidence: 98%

“…The SetCol method [23], widely used in measuring the sinking rate of Phaeocystis, gives only the mean population sinking rate, and the movements of individual colonies within the experimental container remain unknown. Skreslet [18] instead directly observed the rising velocity of P. pouchetii (Hariot) Lagerheim colonies within a container after the container was overturned, which obviously would have generated convection and increased the movement of the colonies. Therefore, the rising velocity of P. pouchetii colonies reported by Skreslet is likely an overestimation.…”

Section: Introductionmentioning

confidence: 99%

“…The highest and lowest sinking rates are usually found when phytoplankton cells are grown at limiting and saturating irradiance, respectively [25]. Colonies of P. antarctica Karsten exhibit buoyancy regulation when placed in an illuminated incubator [26], but Skreslet suggested that the difference in colony buoyancy between light and dark conditions is not significant [18].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Buoyancy Regulation in Phaeocystis globosa Scherffel Colonies

Wang¹

2010

TOMBJ

View full text Add to dashboard Cite

Buoyancy of Phaeocystis globosa Scherffel (Prymnesiophyceae) colonies was investigated by measuring the vertical distribution of colonies in quiescent water where convection had been removed. Over 60% of the colonies exhibited negative buoyancy regardless of light condition or growth phase. Positively and neutrally buoyant colonies lost their buoyancy in the dark, but regained buoyancy upon return to the light. Colonies with closer cell packing; i.e., more cells per unit colonial surface area, had greater capability to remain buoyant. Our results suggest that colony buoyancy was not uniform within a P. globosa population, and that biological regulation of colony buoyancy required light energy.

show abstract

High export via small particles before the onset of the North Atlantic spring bloom

et al. 2016

View full text Add to dashboard Cite

Sinking organic matter in the North Atlantic Ocean transfers 1–3 Gt carbon yr−1 from the surface ocean to the interior. The majority of this exported material is thought to be in form of large, rapidly sinking particles that aggregate during or after the spring phytoplankton bloom. However, recent work has suggested that intermittent water column stratification resulting in the termination of deep convection can isolate phytoplankton from the euphotic zone, leading to export of small particles. We present depth profiles of large (>0.1 mm equivalent spherical diameter, ESD) and small (<0.1 mm ESD) sinking particle concentrations and fluxes prior to the spring bloom at two contrasting sites in the North Atlantic (61.30°N, 11.00°W and 62.50°N, 02.30°W) derived from the Marine Snow Catcher and the Video Plankton Recorder. The downward flux of organic carbon via small particles ranged from 23 to 186 mg C m−2 d−1, often constituting the bulk of the total particulate organic carbon flux. We propose that these rates were driven by two different mechanisms. In the Norwegian Basin, small sinking particles likely reached the upper mesopelagic by disaggregation of larger, faster sinking particles. In the Iceland Basin, a storm deepened the mixed layer to >300 m depth, leading to deep mixing of particles as deep as 600 m. Subsequent restratification could trap these particles at depth and lead to high particle fluxes at depth without the need for aggregation (“mixed‐layer pump”). Overall, we suggest that prebloom fluxes to the mesopelagic are significant, and the role of small sinking particles requires careful consideration.

show abstract

Buoyancy in Phaeocystis pouchetii (Hariot) Lagerheim

Cited by 24 publications

References 9 publications

Phytoplankton and bacterial uptake of inorganic and organic nitrogen during an induced bloom of Phaeocystis pouchetii

Phytoplankton and bacterial uptake of inorganic and organic nitrogen during an induced bloom of Phaeocystis pouchetii

Buoyancy Regulation in Phaeocystis globosa Scherffel Colonies

High export via small particles before the onset of the North Atlantic spring bloom

Contact Info

Product

Resources

About