The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Sam Van Wassenbergh - One of the best experts on this subject based on the ideXlab platform.
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Morphology, Kinematics,andDynamics: TheMechanicsofSuction Feeding in Fishes
2020Co-Authors: Timothy E. Higham, Roi Holzman, Sam Van WassenberghAbstract:Synopsis Suction feeding is pervasive among aquatic vertebrates, and our understanding of the functional morphology and biomechanics of suction feeding has recently been advanced by combining experimental and modeling approaches. Key advances include the visualization of the patterns of flow in front of the Mouth of a feeding fish, the measurement of pressure inside their Mouth Cavity, and the employment of analytical and computational models. Here, we review the key components of the morphology and kinematics of the suction-feeding system of anatomically generalized, adult rayfinned fishes, followed by an overview of the hydrodynamics involved. In the suction-feeding apparatus, a strong mechanistic link among morphology, kinematics, and the capture of prey is manifested through the hydrodynamic interactions between the suction flows and solid surfaces (the Mouth Cavity and the prey). It is therefore a powerful experimental system in which the ecology and evolution of the capture of prey can be studied based on first principals.
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Kinematics of Mouthbrooding in Oreochromis niloticus (Cichlidae).
The Journal of Experimental Biology, 2016Co-Authors: Sam Van Wassenbergh, Iris Joris, Mathieu Desclée, Jung Liew, Gudrun De Boeck, Dominique Adriaens, Peter AertsAbstract:ABSTRACT Many species from several different families of fishes perform Mouthbrooding, where one of the sexes protects and ventilates the eggs inside the Mouth Cavity. This ventilation behaviour differs from gill ventilation outside the brooding period, as the normal, small-amplitude suction-pump respiration cycles are alternated with actions including near-simultaneous closed-Mouth protrusions and high-amplitude depressions of the hyoid. The latter is called churning, referring to its hypothetical function in moving around and repositioning the eggs by a presumed hydrodynamic effect of the marked shifts in volume along the Mouth Cavity. We tested the hypothesis that churning causes the eggs located posteriorly in the Mouth Cavity to move anteriorly away from the gill entrance. This would prevent or clear accumulations of brood at the branchial basket, which would otherwise hinder breathing by the parent. Dual-view videos of female Nile tilapias ( Oreochromis niloticus ) during Mouthbrooding showed that churning involves a posterior-to-anterior wave of expansion and compression of the head volume. Flow visualisation with polyethylene microspheres revealed a significant inflow of water entering the gill slits at the zone above the pectoral fin base, followed by a predominantly ventral outflow passing the ventrolaterally flapping branchiostegal membranes. X-ray videos indicated that particularly the brood located close to the gills is moved anteriorly during churning. These data suggest that, in addition to mixing of the brood to aid its oxygenation, an important function of the anterior flow through the gills and buccal Cavity during churning is to prevent clogging of the eggs near the gills.
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Morphology, Kinematics, and Dynamics: The Mechanics of Suction Feeding in Fishes
Integrative and Comparative Biology, 2015Co-Authors: Timothy E. Higham, Roi Holzman, Sam Van WassenberghAbstract:Suction feeding is pervasive among aquatic vertebrates, and our understanding of the functional morphology and biomechanics of suction feeding has recently been advanced by combining experimental and modeling approaches. Key advances include the visualization of the patterns of flow in front of the Mouth of a feeding fish, the measurement of pressure inside their Mouth Cavity, and the employment of analytical and computational models. Here, we review the key components of the morphology and kinematics of the suction-feeding system of anatomically generalized, adult ray-finned fishes, followed by an overview of the hydrodynamics involved. In the suction-feeding apparatus, a strong mechanistic link among morphology, kinematics, and the capture of prey is manifested through the hydrodynamic interactions between the suction flows and solid surfaces (the Mouth Cavity and the prey). It is therefore a powerful experimental system in which the ecology and evolution of the capture of prey can be studied based on first principals.
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Aquatic suction feeding dynamics: insights from computational modelling
Journal of the Royal Society Interface, 2008Co-Authors: Sam Van Wassenbergh, Peter AertsAbstract: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.
Carlos A Rosa - One of the best experts on this subject based on the ideXlab platform.
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yeasts occurring in surface and Mouth Cavity of two chelonian species podocnemis expansa schweigger and p unifilis troschel reptilia chelonia pelomedusidae in the javaes river border of araguaia national park in brazil
International Journal of Microbiology, 2010Co-Authors: Paula Benevides De Morais, Raphael Sanzio Pimenta, Inara Brito Tavares, Virginia De Garcia, Carlos A RosaAbstract:Thirty-eight specimens of free-ranging Podocnemis expansa (Amazon turtle) and 22 of P. unifilis (Tracaja) were screened for yeast isolation from surface (plastron, skin, and nails), eye, and Mouth Cavity. A hundred and eighteen yeast isolates belonging to 39 species were obtained. Debaryomyces hansenii, Candida galli, C. sake, and Rhodotorula mucilaginosa were the most frequent species isolated from these chelonians. Species diversity measured by Shannon's index was shown to be low and a degree of dominance could be detected as species known as potential pathogens were commonly isolated. The effective number of species in plastron of P. expansa was higher than in Mouth samples, but not in P. unifilis probably due to dietary factors. P. expansa animals were captured on the beaches, and the superficial yeast populations may include terrestrial species. P. unifilis animals were captured in the water and the yeasts from superficial sites may represent species from river water.
Roi Holzman - One of the best experts on this subject based on the ideXlab platform.
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Morphology, Kinematics,andDynamics: TheMechanicsofSuction Feeding in Fishes
2020Co-Authors: Timothy E. Higham, Roi Holzman, Sam Van WassenberghAbstract:Synopsis Suction feeding is pervasive among aquatic vertebrates, and our understanding of the functional morphology and biomechanics of suction feeding has recently been advanced by combining experimental and modeling approaches. Key advances include the visualization of the patterns of flow in front of the Mouth of a feeding fish, the measurement of pressure inside their Mouth Cavity, and the employment of analytical and computational models. Here, we review the key components of the morphology and kinematics of the suction-feeding system of anatomically generalized, adult rayfinned fishes, followed by an overview of the hydrodynamics involved. In the suction-feeding apparatus, a strong mechanistic link among morphology, kinematics, and the capture of prey is manifested through the hydrodynamic interactions between the suction flows and solid surfaces (the Mouth Cavity and the prey). It is therefore a powerful experimental system in which the ecology and evolution of the capture of prey can be studied based on first principals.
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Characterization of zebrafish larvae suction feeding flow using μPIV and optical coherence tomography
Experiments in Fluids, 2016Co-Authors: Kerem Pekkan, Brian Chang, Fazil Uslu, Karthick Mani, Chia-yuan Chen, Roi HolzmanAbstract:The hydrodynamics of suction feeding is critical for the survival of fish larvae; failure to capture food during the onset of autonomous feeding can rapidly lead to starvation and mortality. Fluid mechanics experiments that investigate the suction feeding of suspended particles are limited to adult fishes, which operate at large Reynolds numbers. This manuscript presents the first literature results in which the external velocity fields generated during suction feeding of early zebrafish larvae (2500–20,000 μm total length) are reported using time-resolved microscopic particle image velocimetry. For the larval stages studied, the maximum peak suction velocity of the inflow bolus is measured at a finite distance from the Mouth tip and ranges from 1 to 8 mm/s. The average pressure gradient and the velocity profile proximal to the buccal (Mouth) Cavity are calculated, and two distinct trends are identified. External recirculation regions and reverse flow feeding cycles are also observed and quantified. One of the unresolved questions in fish suction feeding is the shape and dynamics of the buccal Cavity during suction feeding; optical coherence tomography imaging is found to be useful for reconstructing the Mouth kinematics. The projected area of the Mouth Cavity during the feeding cycle varies up to 160 and 22 % for the transverse and mid-sagittal planes, respectively. These findings can inspire novel hydrodynamically efficient biomedical and microfluidic devices.
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Morphology, Kinematics, and Dynamics: The Mechanics of Suction Feeding in Fishes
Integrative and Comparative Biology, 2015Co-Authors: Timothy E. Higham, Roi Holzman, Sam Van WassenberghAbstract:Suction feeding is pervasive among aquatic vertebrates, and our understanding of the functional morphology and biomechanics of suction feeding has recently been advanced by combining experimental and modeling approaches. Key advances include the visualization of the patterns of flow in front of the Mouth of a feeding fish, the measurement of pressure inside their Mouth Cavity, and the employment of analytical and computational models. Here, we review the key components of the morphology and kinematics of the suction-feeding system of anatomically generalized, adult ray-finned fishes, followed by an overview of the hydrodynamics involved. In the suction-feeding apparatus, a strong mechanistic link among morphology, kinematics, and the capture of prey is manifested through the hydrodynamic interactions between the suction flows and solid surfaces (the Mouth Cavity and the prey). It is therefore a powerful experimental system in which the ecology and evolution of the capture of prey can be studied based on first principals.
Paula Benevides De Morais - One of the best experts on this subject based on the ideXlab platform.
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Enterobacteriaceae in Mouth and cloaca of podocnemis expansa and P. Unifilis (testudines: chelonia) populations of national park of araguaia plains, Brazil.
Brazilian Journal of Microbiology, 2011Co-Authors: Paula Benevides De Morais, Denise Rodrigues De Souza, Francisca Maria Pinheiro De Sousa, Kleverson Wessel De Oliveira, Raphael Sanzio PimentaAbstract:Shigella flexnerii and Escherichia coli were the most frequent Gram-negative bacteria found in the Mouth Cavity and cloacae of the turtles Podocnemis expansa and P. unifilis on beaches in the National Park of Araguaia, Brazil. Reptiles are known as Salmonella carriers, despite rarely isolated in these turtles.
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yeasts occurring in surface and Mouth Cavity of two chelonian species podocnemis expansa schweigger and p unifilis troschel reptilia chelonia pelomedusidae in the javaes river border of araguaia national park in brazil
International Journal of Microbiology, 2010Co-Authors: Paula Benevides De Morais, Raphael Sanzio Pimenta, Inara Brito Tavares, Virginia De Garcia, Carlos A RosaAbstract:Thirty-eight specimens of free-ranging Podocnemis expansa (Amazon turtle) and 22 of P. unifilis (Tracaja) were screened for yeast isolation from surface (plastron, skin, and nails), eye, and Mouth Cavity. A hundred and eighteen yeast isolates belonging to 39 species were obtained. Debaryomyces hansenii, Candida galli, C. sake, and Rhodotorula mucilaginosa were the most frequent species isolated from these chelonians. Species diversity measured by Shannon's index was shown to be low and a degree of dominance could be detected as species known as potential pathogens were commonly isolated. The effective number of species in plastron of P. expansa was higher than in Mouth samples, but not in P. unifilis probably due to dietary factors. P. expansa animals were captured on the beaches, and the superficial yeast populations may include terrestrial species. P. unifilis animals were captured in the water and the yeasts from superficial sites may represent species from river water.
Raphael Sanzio Pimenta - One of the best experts on this subject based on the ideXlab platform.
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Enterobacteriaceae in Mouth and cloaca of podocnemis expansa and P. Unifilis (testudines: chelonia) populations of national park of araguaia plains, Brazil.
Brazilian Journal of Microbiology, 2011Co-Authors: Paula Benevides De Morais, Denise Rodrigues De Souza, Francisca Maria Pinheiro De Sousa, Kleverson Wessel De Oliveira, Raphael Sanzio PimentaAbstract:Shigella flexnerii and Escherichia coli were the most frequent Gram-negative bacteria found in the Mouth Cavity and cloacae of the turtles Podocnemis expansa and P. unifilis on beaches in the National Park of Araguaia, Brazil. Reptiles are known as Salmonella carriers, despite rarely isolated in these turtles.
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yeasts occurring in surface and Mouth Cavity of two chelonian species podocnemis expansa schweigger and p unifilis troschel reptilia chelonia pelomedusidae in the javaes river border of araguaia national park in brazil
International Journal of Microbiology, 2010Co-Authors: Paula Benevides De Morais, Raphael Sanzio Pimenta, Inara Brito Tavares, Virginia De Garcia, Carlos A RosaAbstract:Thirty-eight specimens of free-ranging Podocnemis expansa (Amazon turtle) and 22 of P. unifilis (Tracaja) were screened for yeast isolation from surface (plastron, skin, and nails), eye, and Mouth Cavity. A hundred and eighteen yeast isolates belonging to 39 species were obtained. Debaryomyces hansenii, Candida galli, C. sake, and Rhodotorula mucilaginosa were the most frequent species isolated from these chelonians. Species diversity measured by Shannon's index was shown to be low and a degree of dominance could be detected as species known as potential pathogens were commonly isolated. The effective number of species in plastron of P. expansa was higher than in Mouth samples, but not in P. unifilis probably due to dietary factors. P. expansa animals were captured on the beaches, and the superficial yeast populations may include terrestrial species. P. unifilis animals were captured in the water and the yeasts from superficial sites may represent species from river water.