Suction feeding by a tiny predatory tadpole

Deban, Stephen M.; Olson, Wendy M.

doi:10.1038/420041a

Cited by 38 publications

(29 citation statements)

References 11 publications

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“…Although development to the tadpole stage appears quite similar comparing X. laevis and X. tropicalis , a tiny related frog Hymenochirus (2.5 cm) may have reached a cell number low enough to affect its development, but this has not been directly shown. Interestingly, Hymenochirus tadpoles with a body length of 2.6 mm are the smallest known vertebrate predators (Deban and Olson 2002). However, it appears that development in many amphibians is overall quite tolerant to changes in cell number.…”

Section: Cell-organism Scaling Relationships Physiology and Developmentmentioning

confidence: 99%

Biological Scaling Problems and Solutions in Amphibians

Levy

Heald

2015

Cold Spring Harb Perspect Biol

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Size is a primary feature of biological systems that varies at many levels, from the organism to its constituent cells and subcellular structures. Amphibians populate some of the extremes in biological size and have provided insight into scaling mechanisms, upper and lower size limits, and their physiological significance. Body size variation is a widespread evolutionary tactic among amphibians, with miniaturization frequently correlating with direct development that occurs without a tadpole stage. The large genomes of salamanders lead to large cell sizes that necessitate developmental modification and morphological simplification. Amphibian extremes at the cellular level have provided insight into mechanisms that accommodate cell-size differences. Finally, how organelles scale to cell size between species and during development has been investigated at the molecular level, because subcellular scaling can be recapitulated using Xenopus in vitro systems.

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Section: Cell-organism Scaling Relationships Physiology and Developmentmentioning

confidence: 99%

Biological Scaling Problems and Solutions in Amphibians

Levy

Heald

2015

Cold Spring Harb Perspect Biol

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“…We use a scale commonly used in studies of fish locomotion (Fuiman and Webb, 1988;Müller et al, 2008;Videler et al, 2002), in which a low Re regime extends to 75 and an intermediate regime falls between 75 and 270. Larvae of the zebrafish Danio rerio were shown to produce flow into the mouth during feeding at Re as low as 5 (Hernandez, 2000) while similarly sized suction-feeding tadpoles Hymenochirus boettgeri generated Re up to 300 (Deban and Olson, 2002). Hymenochirus is a carnivorous pipid tadpole that is much smaller than X. laevis at first feeding (<1mm versus 4mm) (Deban and Olson, 2002).…”

Section: Reynolds Number and Effects Of Viscositymentioning

confidence: 99%

“…Larvae of the zebrafish Danio rerio were shown to produce flow into the mouth during feeding at Re as low as 5 (Hernandez, 2000) while similarly sized suction-feeding tadpoles Hymenochirus boettgeri generated Re up to 300 (Deban and Olson, 2002). Hymenochirus is a carnivorous pipid tadpole that is much smaller than X. laevis at first feeding (<1mm versus 4mm) (Deban and Olson, 2002). Compared with suspension feeding, suction feeding, as seen in Danio and Hymenochirus, is distinguished by rapid water intake and relatively much slower water expulsion.…”

Section: Reynolds Number and Effects Of Viscositymentioning

confidence: 99%

Buccal pumping mechanics ofXenopus laevistadpoles: effects of biotic and abiotic factors

Ryerson

Deban

2010

Journal of Experimental Biology

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SUMMARYBiotic factors such as body size and shape have long been known to influence kinematics in vertebrates. Movement in aquatic organisms can also be strongly affected by abiotic factors such as the viscosity of the medium. We examined the effects of both biotic factors and abiotic factors on buccal pumping kinematics in Xenopus tadpoles using high-speed imaging of an ontogenetic series of tadpoles combined with experimental manipulation of the medium over a 10-fold range of viscosity. We found influences of both biotic and abiotic factors on tadpole movements; absolute velocities and excursions of the jaws and hyoid were greater in higher viscosity fluid but durations of movements were unaffected. Smaller tadpoles have relatively wider heads and more robust hyoid muscles used in buccal expansion and compression. Lever arm ratios were found to be constant at all sizes; therefore, smaller tadpoles have relatively higher resolved muscle forces and, like tadpoles in more viscous medium, displayed higher absolute velocities of jaw and hyoid movements. Nonetheless, small tadpoles drew in water at lower Reynolds numbers (Re) than predicted by kinematics, due to negative allometry of the buccal pump. Finally, tadpoles transitioned from a flow regime dominated by viscous forces (Re2) to an intermediate regime (Re106).

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“…Alexander 1969;Liem 1980;Wainwright et al 2001;Gibb & Ferry-Graham 2005), frogs (e.g. Deban & Olson 2002;Dean 2003), salamanders (e.g. Deban & O'Reilly 2005) and mammals (e.g.…”

Section: Suction Feeding and Modellingmentioning

confidence: 99%

Aquatic suction feeding dynamics: insights from computational modelling

Wassenbergh

Aerts

2008

J. R. Soc. Interface.

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Aquatic suction feeding in vertebrates involves extremely unsteady flow, externally as well as internally of the expanding mouth cavity. Consequently, studying the hydrodynamics involved in this process is a challenging research area, where experimental studies and mathematical models gradually aid our understanding of how suction feeding works mechanically. Especially for flow patterns inside the mouth cavity, our current knowledge is almost entirely based on modelling studies. In the present paper, we critically discuss some of the assumptions and limitations of previous analytical models of suction feeding using computational fluid dynamics.

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Suction feeding by a tiny predatory tadpole

Cited by 38 publications

References 11 publications

Biological Scaling Problems and Solutions in Amphibians

Biological Scaling Problems and Solutions in Amphibians

Buccal pumping mechanics ofXenopus laevistadpoles: effects of biotic and abiotic factors

Aquatic suction feeding dynamics: insights from computational modelling

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