Adding ecology to particle capture models: Numerical simulations of capture on a moving cylinder in crossflow

Krick, Julian; Ackerman, Josef Daniel

doi:10.1016/j.jtbi.2014.12.003

Cited by 18 publications

(14 citation statements)

References 39 publications

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“…20 000 species of buzz‐pollinated angiosperms occurs in response to resonance vibrations deliberately applied to flowers by pollinating bees (Harder & Barclay, ; King & Buchmann, ; Vallejo‐Marín, ). Resonance vibration of stems may also promote pollen capture (Niklas, ; Krick & Ackerman, ) and is an important mechanism of wind pollination in grasses and Ephedra (Friedman & Harder, ; Niklas, ; McCombe & Ackerman, ). Despite the prevalence of wind‐induced vibration mechanisms in the reproductive ecology of plants, their evolutionary histories, biomechanical mechanisms and effects on fitness have barely been considered.…”

Section: Discussionmentioning

confidence: 99%

“…Variation in floral traits of Thalictrum and their functional link to pollen release poses a challenge to traditional concepts of wind and animal pollination as binary states associated with specific adaptive syndromes (Faegri & van der Pijl, ; Whitehead, ; Friedman & Barrett, ). Our study revealed that for Thalictrum species, it may be more accurate to describe wind pollination as a continuously varying condition, at least in terms of pollen dispersal, whose relevance for a species must be evaluated in terms of performance‐related traits such as f n and ξ for pollen release, or capture efficiency η for pollen receipt (Krick & Ackerman, ; McCombe & Ackerman, ). An explicit prediction from this perspective is that wind pollination mechanisms were assembled from animal‐pollinated ancestors, piecemeal through a sequence of various intermediate stages rather than by a single deterministic and predictable pathway of trait change.…”

Section: Discussionmentioning

confidence: 99%

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Comparative analysis of pollen release biomechanics in Thalictrum: implications for evolutionary transitions between animal and wind pollination

Timerman

Barrett

2019

New Phytologist

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Transitions from animal to wind pollination have occurred repeatedly in flowering plants, driven by structural and biomechanical modifications to flowers. But the initial changes promoting wind pollination are poorly understood, especially those required to release pollen into airflowsthe critical first stage of wind pollination.Using a wind tunnel, we performed a comparative study of pollen release biomechanics in 36 species of animal-and wind-pollinated Thalictrum. We quantified pollination syndromes and stamen natural frequency (f n ), a key vibration parameter, to determine if floral traits reliably predicted pollen release probability. We then investigated if pollen release was caused by wind-induced resonance vibration of stamens.We detected wind-induced stamen resonance in 91% of species and a strong effect of stamen acceleration on pollen release, inversely driven by f n . However, unlike f n , pollination syndromes did not reliably predict the probability of pollen release among species.Our results directly link f n to the capacity of stamens to release pollen by wind and suggest that structural mechanisms reducing f n are likely to be important for initiating transitions from animal to wind pollination. Our inability to predict the probability of pollen release based on pollination syndromes suggests diverse phenotypic trajectories from animal to wind pollination.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Comparative analysis of pollen release biomechanics in Thalictrum: implications for evolutionary transitions between animal and wind pollination

Timerman

Barrett

2019

New Phytologist

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“…Finally, although previous studies have ignored the added mass force (Haugen & Kragset 2010; Krick & Ackerman 2015), we deem it important to be included in the force balance. It is proportional to the particle acceleration relative to the fluid Here is the mass coefficient of a sphere.…”

Section: Particle Advectionmentioning

confidence: 99%

“…If the fluid were stagnant, there would be no pressure gradient accelerating it and this force would simply vanish. Finally, although previous studies have ignored the added mass force (Haugen & Kragset 2010;Krick & Ackerman 2015), we deem it important to be included in the force balance. It is proportional to the particle acceleration relative to the fluid…”

Section: Coral Branch As a Circular Spring-mounted Cylinder In Flowmentioning

confidence: 99%

“…Surprisingly, data on particle capture by vibrating collectors are scarce. Even the handful of papers that have examined the effect of collector motion (Krick & Ackerman 2015; McCombe & Ackerman 2018) were imposing oscillation frequencies and amplitudes, not always covering the vibration parameter range encountered in the living world. Field experiments on a timothy grass revealed that it captured and germinated more pollen than transverse-tethered and stream-wise-tethered grasses (McCombe & Ackerman 2018).…”

Section: Introductionmentioning

confidence: 99%

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Vortex-induced vibrations: a soft coral feeding strategy?

2021

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A spanwise oscillating plate in a crossflow: Implication for mass transfer and locomotion

Jabbari

Yanase

Ackerman

2021

Limnology & Oceanography

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Many aquatic processes (i.e., organism locomotion, macrophyte response to unsteady flow and mass/heat transfer) involve oscillatory or undulatory movements perpendicular to the direction of flow and perpendicular to the plane of oscillation (i.e., spanwise). The reduction of boundary layer (BL) thickness (δ) and increased turbulence have been identified as the mechanisms for faster heat and mass transfer on these moving surfaces. We examined the hydrodynamics of a submerged spanwise‐oscillating plate in a crossflow within turbulent open channel flow at different oscillation frequencies (f) and channel velocity (U). The BL over the plate was characterized using moving particle image velocimetry to understand the effects of f and U on boundary stress, vorticity, and transfer processes. Changes in the velocity gradient at the plate surface depend on the interactions between spanwise vorticities of opposite directions that reversed downstream along the plate. The vorticity structure reduced shear stress at the surface of the plate resulting in > 65% drag reduction near the upstream edge. Whereas δ was reduced in comparison to a stationary plate, vorticity increased the diffusive sublayer thickness true(δDSL) over the oscillating plate (≲1.75 thicker than stationary), which would reduce rather than increase mass transfer based on the film model. Conversely, oscillations would enhance the mass transfer by a factor of ≤ 7 due to periodic renewal of water at the DSL. Similar arguments indicate that renewal would lead to increased convective heat transfer along the plate. Results of this work will increase our understanding of the physical and biological processes that occur in environmental boundary layers.

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Adding ecology to particle capture models: Numerical simulations of capture on a moving cylinder in crossflow

Cited by 18 publications

References 39 publications

Comparative analysis of pollen release biomechanics in Thalictrum: implications for evolutionary transitions between animal and wind pollination

Comparative analysis of pollen release biomechanics in Thalictrum: implications for evolutionary transitions between animal and wind pollination

Vortex-induced vibrations: a soft coral feeding strategy?

A spanwise oscillating plate in a crossflow: Implication for mass transfer and locomotion

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