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Collaborative Research: An Integrative Field and Biophysical Model of Thermal Stress, Physiological Performance, and Reproductive Fitness

合作研究：热应激、生理表现和生殖健康的综合场和生物物理模型

基本信息

批准号：
1755389
负责人：
Michael Darnell
金额：
$ 35.76万
依托单位：
University of Southern Mississippi
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-08-15 至 2023-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1755389&HistoricalAwards=false
关键词：
Collaborative Research Integrative Field Biophysical

项目摘要

Animals experience thermal stress at the extremes of their geographic range. This stress may be compounded by climate change, especially when the geographic range stretches over a large range of latitude. Many species use behavioral thermoregulation to ameliorate heat stress. However, these compensatory behaviors have a cost, as they require the animal to abandon critical behaviors that may only be performed in the hot and stressful habitat. This study investigates these survival/reproductive tradeoffs in fiddler crabs, small semi-terrestrial crabs that occupy shorelines in the tropics and temperate zones. Male fiddler crabs use visual displays to attract mates in the hot, dry intertidal zone, but must periodically retreat to a cool, moist burrow to rehydrate and recover. Each retreat to a burrow requires a cessation of mating behavior. Periodically the males rereat from the hot reproductive areas to rehydrate and feed. This study will determine the tradeoff between thermoregulation and mating performance across a species' geographic range, using both experimental and modeling approaches, under both current and predicted future conditions. Finally, the project will utilize the results of the research on fiddler crabs to increase public interest in science using public outreach activities and the training students at different levels including high school students. Behavioral compensation for thermal stress can lead to a profound but under-investigated tradeoff, as thermoregulatory behaviors are costly. Energetic and thermoregulation costs will generate major reproductive opportunity costs, which can reduce mating success. This project focuses on the fitness consequences of missed mating opportunities associated with thermoregulatory behaviors. These missed opportunities are crucial to understand in the study of mating success in the context of physiological stress and the differences in costs at different latitudes. Understanding the associated reductions in fitness are crucial to fully understand and predict the consequences of climate change on fitness, since heating in lower latitudes may truncate the benefit of mating owing to the increased cost of thermal stress. This proposal takes an integrative approach, combining laboratory measurements, manipulative field experiments, and biophysical modeling to examine the fitness consequences of behavioral thermoregulation. This work, and the resulting model, will be broadly applicable to the study of climate change impacts on ectotherms.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.

动物在其地理范围的极端情况下会经历热应激。这种压力可能会因气候变化而加剧，特别是当地理范围延伸到很大的纬度范围时。许多物种使用行为体温调节来改善热应激。然而，这些补偿行为是有代价的，因为它们要求动物放弃可能只在炎热和有压力的栖息地进行的关键行为。这项研究调查了招潮蟹的生存/繁殖权衡，招潮蟹是一种占据热带和温带海岸线的小型半陆栖蟹。雄性招潮蟹在炎热干燥的潮间带用视觉展示来吸引配偶，但必须定期退回凉爽潮湿的洞穴中补充水分和恢复。每次撤退到洞穴都需要停止交配行为。雄性周期性地从炎热的繁殖区撤退，以补充水分和食物。本研究将利用实验和建模方法，在当前和预测的未来条件下，确定跨物种地理范围的体温调节和交配表现之间的权衡。最后，本计划将利用招潮蟹的研究成果，透过公众外展活动及对包括高中生在内的不同层次学生的培训，提高公众对科学的兴趣。热应激的行为补偿可能导致一个深刻的但尚未得到充分研究的权衡，因为温度调节行为是昂贵的。能量和体温调节成本将产生主要的生殖机会成本，从而降低交配成功率。该项目主要关注与体温调节行为相关的错过交配机会的适应性后果。这些错失的机会对于理解生理压力下交配成功的研究以及不同纬度下交配成本的差异至关重要。了解相关的适应性降低对于充分理解和预测气候变化对适应性的影响至关重要，因为低纬度地区的加热可能会由于热应激成本的增加而削弱交配的好处。本研究采用综合方法，结合实验室测量、操作现场实验和生物物理模型来研究行为体温调节对健康的影响。这项工作以及由此产生的模型将广泛适用于研究气候变化对变温动物的影响。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。