Sinking properties of some phytoplankton shapes and the relation of form resistance to morphological diversity of plankton — an experimental study

Padisák, Judit; Soróczki-Pintér, Éva; Rezner, Zsuzsanna

doi:10.1007/978-94-007-1084-9_18

Cited by 67 publications

(86 citation statements)

References 18 publications

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“…The small size of species in this group and the presence of flagella facilitated buoyancy, especially in rivers. Meanwhile, the large size and teardrop shape of species in Group RIIb worsened the sinking problem (Padisák et al, 2003). Therefore, the dominance of Group RIIb was not achieved in turbulent environments with K d >4.5 m -1 .…”

Section: Groups Riia and Riib: Coexistence Of Flagella And Exoskeletamentioning

confidence: 99%

“…1 and 2). Both Group RIV and MBFG IV included coenobium, which comprised many flagellated cells (e.g., Pandorina morum), that cannot reach high unidirectional speed because of the unsynchronized flagellar movement of individual cells in the colony is not synchronized (Padisák et al, 2003). In this way, the functions (e.g., motility and flotation) of morphological variability (e.g., shapes, spines, and protuberances) that were observed among cells in the colony were most likely handicapped by cybotactic life forms.…”

Section: Group Riv: Medium Sized Organisms Lacking Specialized Traitsmentioning

confidence: 99%

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Morphology-based classification of functional groups for potamoplankton

Chen

Liu

et al. 2015

J Limnol

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Section: Groups Riia and Riib: Coexistence Of Flagella And Exoskeletamentioning

confidence: 99%

Section: Group Riv: Medium Sized Organisms Lacking Specialized Traitsmentioning

confidence: 99%

Morphology-based classification of functional groups for potamoplankton

Chen

Liu

et al. 2015

J Limnol

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“…Increased morphological complexity of the cell, achieved through the acquisition of various projections, spines and keels, might represent a mechanismimproved buoyancy. Departure from spherical cell shape increases form resistance-the difference in sinking velocity between a particle and a sphere with identical density and volume-and therefore decreases sinking velocity allowing cells to stay suspended longer (Padisák et al, 2003). The morphology of a colony can have an effect on sinking velocity as well.…”

Section: Discussionmentioning

confidence: 99%

“…The morphology of a colony can have an effect on sinking velocity as well. Tubular, spiral or stellate arrangements that maintain colony symmetry exhibit reduced sinking relative to asymmetrical arrangements (Padisák et al, 2003;Reynolds, 2006). Increase in cell size, a strategy that accompanied transitions to the plankton in some marine lineages (for example, the benthic Odontella longicruris (Greville) Hoban versus the larger planktonic O. longicruris var.…”

Section: Discussionmentioning

confidence: 99%

“…Long filamentous or branched colonies, on the other hand, tend to establish later in the succession, when the mat is crowded and cells improve access to nutrients and light by rising above the boundary layer (Hoagland et al, 1982;Hoagland, 1983;McCormick and Stevenson, 1991). Growth form is similarly consequential in the plankton because species' sinking rate and vertical position in the water column are affected by colony morphology and symmetry (Padisák et al, 2003;Reynolds, 2006). Thus, the amount of light and nutrients available to a cell living in a stratified environment is at least partially influenced by the ability to form colonies and their properties.…”

Section: Introductionmentioning

confidence: 99%

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Comparative analysis of the interaction between habitat and growth form in diatoms

Nakov¹,

Ashworth

Theriot

2014

The ISME Journal

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We characterized the evolutionary history of growth form (solitary-colonial) and its interaction with species' habitat (planktonic-benthic) across a multi-gene phylogeny encompassing a broad sample of the order-level diversity of diatoms. We treated these characters broadly, modeling the evolution of aggregation of cells into a colony irrespective of the way aggregation is achieved, and relating the growth form to a broad concept of niche location: in the plankton or benthos. The results showed that habitat shifts are rare implying conservatism in niche location at the level of large clades. On the other hand, the evolutionary history of growth form is more dynamic with evolutionary rates that vary across the tree. Analyses of a possible interaction revealed that shifts in growth form are independent of habitat and that traversing between habitats does not hinge upon species' growth form. Our findings help to fill a gap in the understanding of diatom niche and growth form macroevolution and contribute toward a platform for the comparative study of the mechanisms underlying diatom species and functional diversity.

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Variation in the Settling Velocity of Suspended Particulate Matter in Shallow Lakes, with Special Implications for Mass Balance Modelling

Malmaeus

2004

International Review of Hydrobiology

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Measurements of sedimentation were combined with water samples to calculate settling velocity of suspended particulate matter (SPM) in lakes. The study sites were open water stations and enclosures in Lake Erken (Sweden) and Lake Balaton (Hungary). Settling velocities were found to vary considerably both inside and outside the enclosures. Within sites, the differences between 25th and 75th percentiles of measured settling velocities of SPM were two-or three-fold. Median settling velocities of SPM ranged from around 0.5 m/d in the enclosures of Lake Erken to more than 8 m/d in the open water of Lake Balaton. Special relevance was attributed to flocculation, which is known to be affected by, e.g., SPM concentration and turbulence. Even though not directly measured, the less turbulent environment inside the enclosures was suggested to explain the low settling velocity compared to the open water environment. Settling velocity apparently correlated with water current speed (r 2 = 0.66; n = 12). Stepwise multiple linear regressions were used to relate the variability in settling velocity of SPM to the variability of possible controlling factors in a number of data subsets. In most cases, one variable describing the total amount of settling material (e.g., SPM) and one variable reflecting the composition of settling material (e.g., total phosphorus) were chosen. The use of suspended solids concentration to predict settling velocity in mass balance models was discussed. It was found that the mean slope between SPM and v SPM was close to 0.1 (m 4 d -1 g -1).

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Sinking properties of some phytoplankton shapes and the relation of form resistance to morphological diversity of plankton — an experimental study

Cited by 67 publications

References 18 publications

Morphology-based classification of functional groups for potamoplankton

Morphology-based classification of functional groups for potamoplankton

Comparative analysis of the interaction between habitat and growth form in diatoms

Variation in the Settling Velocity of Suspended Particulate Matter in Shallow Lakes, with Special Implications for Mass Balance Modelling

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