Consideration of thrust in escaping motion of a mosquito larva

Kikuchi, Kenji; Mochizuki, Osamu

doi:10.5226/jabmech.1.111

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…Both types of these fins were reported to contribute to vortex generation related to thrust. The thrust generated by aquatic organisms has been attributed to the production of a vortex ring using a digital particle image velocimetry (DPIV) technique (Ichikawa and Mochizuki 2008;Kikuchi and Mochizuki 2010;Sakakibara 2004).…”

Section: Introductionmentioning

confidence: 99%

Morphological Considerations of Fish Fin Shape on Thrust Generation

Kikuchi

Uehara

Kubota

et al. 2014

JAFM

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In this study, we aimed to determine the relationship between thrust generation and fish fin shape. To compare the effect fin shape had on thrust generation, we categorized the morphological shapes of fish fins into equilateral polygonal shapes. Polygonal fins were used to generate thrust that depended only on shape. These fins were constructed of a hard elastic material to eliminate any influence of shape deformation. A servomotor with a reciprocal rotation moved a fin cyclically, and thrust was experimentally measured using a strain gage system. Thrust tended to be proportional to the inertia moment of a fin, which indicated difficulty with rotation. Moreover, this trend for thrust generation was directly related to the number of apexes of a polygonal fin. The force translated ratio, which was thrust divided by the force required for fin rotation, was evaluated to determine the hydrodynamic characteristics of fins. This finding showed that the force translated ratio of a fin increased with increased movable perimeter length. The greatest thrust was generated by a triangular fin rotated at its apex, which is often seen in general fish tail fins, whereas the hydrodynamic characteristics were the worst in polygonal fins.

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Section: Introductionmentioning

confidence: 99%

Morphological Considerations of Fish Fin Shape on Thrust Generation

Kikuchi

Uehara

Kubota

et al. 2014

JAFM

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“…When attacked, mosquito larvae can avoid predation by escape swimming (Awasthi et al, 2015;Kikuchi and Mochizuki, 2010). After the 48-hour pesticide exposure period, the escape swimming speed was determined based on a protocol of Stoks and McPeek (2006) and Delnat et al (2017).…”

Section: Escape Swimming Speedmentioning

confidence: 99%

Resistance to a chemical pesticide increases vulnerability to a biopesticide: Effects on direct mortality and mortality by predation

et al. 2019

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Pesticide mixtures are increasingly used to fight pest species that developed resistance to pesticides. To assess the pesticide control efficiency and to reduce ecological damage to nontarget species, it is important to quantify the effect of these mixtures and compare them with the effect of their single pesticides on pest species, non-target species and their predator-prey interactions. We studied the effects of the chemical pesticide chlorpyrifos (CPF), the biopesticide Bacillus thuringiensis israelensis (Bti) and their mixture both on the direct mortality and on the mortality by predation. We focused on larvae of a CPF-resistant and a non-resistant strain of the vector mosquito Culex quinquefasciatus and its predator, the pygmy backswimmer Plea minutissima. In the CPF-Bti mixture, both pesticides interacted antagonistically for direct mortality. Exposure to the mixture caused equal direct mortality and equal mortality by predation in both strains. As expected, exposure to CPF resulted in less direct mortality and less mortality by predation in the CPF-resistant mosquito strain compared to the non-resistant strain. Notably, Bti caused a higher mortality in the mosquito larvae of the CPF-resistant strain compared to the non-resistant strain. Furthermore, the predator killed more mosquito larvae of the resistant strain compared to the non-resistant strain when exposed before to Bti alone. These observations identify a novel cost of resistance to a chemical pesticide in terms of increased vulnerability to a biopesticide.

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Biomimetics

2018

Integrated Nano-Biomechanics

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Consideration of thrust in escaping motion of a mosquito larva

Cited by 6 publications

References 5 publications

Morphological Considerations of Fish Fin Shape on Thrust Generation

Morphological Considerations of Fish Fin Shape on Thrust Generation

Resistance to a chemical pesticide increases vulnerability to a biopesticide: Effects on direct mortality and mortality by predation

Biomimetics

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