Collaborative Research: EAGER: Characterizing a Novel Turbulence-generating System to Facilitate Exploration of Insect Orientation Behavior Under Real-world Conditions

该项目是一名生物学家和一名工程师之间的合作，将开发和测试一种创新设备，以控制和再现风洞中的气流，以模拟飞行昆虫居住的环境中的气流。气味或其他类似的信号在气流中传播，并形成许多动物用来定位食物，配偶和住所等关键资源的踪迹。目前对飞行昆虫对这些线索的反应行为的理解是从实验室风洞中稳定，平滑流动的研究中获得的。然而，在自然栖息地发生的风条件并不均匀，而是高度可变和动荡。因此，理解飞行昆虫在定向和定位空中线索来源时所采用的策略是不完整的。该项目通过表征现场湍流来解决这一差距，改进新型气流控制装置的设计，并在风洞中用昆虫导航湍流来测试它。气流控制装置的设计和构造细节将提供给科学界，以促进旨在阐明其他飞行动物定向策略的新研究。使用这项技术的研究的新见解可能会改善对重要疾病媒介（蚊子）和农业害虫（飞蛾）的控制，以及其他飞行动物的表现。拟议的研究项目将为学生提供跨学科的培训，并产生相关的课程材料，突出了6-12年级学生工作的跨学科性质。对于许多动物来说，被动标量（如气味、二氧化碳、湿度和热量）是根据它们被排放到其中的流体的湍流动力学分布在环境中的关键信号。目前，有一个显着的知识不足，利用飞行昆虫在定位这些线索的来源的行为机制。这一差距的存在是因为几乎所有以前的研究都是在层流风洞实验中在相对较小的距离上进行的，在层流风洞实验中，湍流被最小化，对标量分布有附带的影响。为了弥合这一差距，有必要开发一种实验装置，使湍流风条件的创建和控制在实验室中。该合作项目将开发一种创新的主动网格系统，用于控制和可再生的湍流生成，以适应两种不同昆虫（飞蛾和蚊子）居住的自然和人造环境中遇到的条件。为了实现这一目标，湍流条件下发生在现场时，昆虫响应相关标量线索的特点。通过测量温度和其他被动标量，如气味和二氧化碳，风洞中的主动网格产生的湍流羽流结构的范围将被评估和调整到从现场测量确定的范围。该项目每年将支持两名研究生和一名本科生研究员，他们将在两个合作实验室内接触跨学科的研究环境。此外，还将为6-12年级的学生开发适合昆虫飞行和行为的材料，并通过虚拟方式传播。该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

This project, a collaboration between a biologist and an engineer, will develop and test an innovative device to control and reproduce airflows in a wind tunnel to mimic those found in environments inhabited by flying insects. Odors or other similar signals are transported on air currents and form trails that many animals use to locate critical resources such as food, mates, and shelter. Current understanding of the behavior of flying insects in response to these cues has been garnered from studies in laboratory wind tunnels with steady, smooth flows. However, the wind conditions that occur in natural habitats are not uniform but instead are highly variable and turbulent. As such, understanding the strategies employed by flying insects as they orient and locate sources of airborne cues is incomplete. This project addresses this gap by characterizing turbulent flows in the field, refining the design of a novel airflow control device and testing it with insects navigating turbulent flows within a wind tunnel. Design and construction details of the airflow control device will be made available to the scientific community to facilitate new research aimed at elucidating the orientation tactics of other flying animals. New insights from studies using this technology may lead to improved control of important disease vectors (mosquitoes) and agricultural pests (moths), as well the performance of other flying animals. The proposed research project will provide interdisciplinary training for students and generate relevant curricular materials that highlight the interdisciplinary nature of the work for students in grades 6-12. For many animals, passive scalars such as odors, carbon dioxide, humidity, and heat are critical signals distributed in the environment according to turbulent dynamics of the fluid into which they are emitted. Currently, there is a significant deficiency in knowledge regarding the behavioral mechanisms utilized by flying insects in locating sources of such cues. This gap exists because virtually all previous studies have been conducted over relatively small distances in laminar-flow wind tunnel experiments where turbulence is minimized with attendant effects on scalar distribution. To bridge this gap, it will be necessary to develop an experimental set-up that enables the creation and control of turbulent wind conditions in the laboratory. The collaborative project will develop an innovative active grid system for the controlled and reproducible generation of turbulence tailored to conditions encountered in natural and built environments inhabited by two different exemplar insects (moths and mosquitoes). In order to accomplish this goal, turbulent conditions that occur in the field when insects are responding to relevant scalar cues will be characterized. Through the measurement of temperature and other passive scalars such as odors and carbon dioxide, the scope of turbulent plume structures generated by the active grid in a wind tunnel will be evaluated and tuned to the range determined from field measurements. The project will support two graduate students and one undergraduate researcher each year, who will be exposed to an inter-disciplinary research environment within the two collaborating laboratories. In addition, curriculum-appropriate materials about insect flight and behavior will be developed for grade 6-12 students and disseminated virtually.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.