The Evolution and Diversification of a Symbiotic Bioluminescence Signaling System

共生生物发光信号系统的进化和多样化

• 批准号: 0444842
• 负责人: John Sparks
• 金额: --
• 依托单位: American Museum Natural History
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-03-01 至 2011-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0444842&HistoricalAwards=false
• 关键词: Evolution; Diversification; Symbiotic; Bioluminescence; Signaling

A grant has been awarded to Dr. John Sparks of the American Museum of Natural History to examine the evolution, coevolutionary interactions and biogeography of the symbiosis between fishes of the family Leiognathidae (ponyfishes) and the luminous marine prokaryote Photobacterium leiognathi. The fish host is abundant, economically important, and widely distributed throughout the Indo-Pacific. The fish harbors a dense population of the bacterial symbiont in an internal circumesophageal structure, called a light organ, providing the bacteria with oxygen and nutrients, and uses bacterial luminescence in various displays associated with predation, anti-predation and sex-specific signaling. Males of most ponyfish species exhibit greatly enlarged, structurally complex and species-specific light organs, whereas those of females are comparatively poorly developed. It is hypothesized that sexual selection for male luminescence signaling is correlated with morphological diversification of the light organ system (LOS) and speciation in ponyfishes. Although the evolution and functions of a sexually-dimorphic bioluminescent system based on species-specific male signaling are well documented in fireflies, in vertebrates these systems are poorly understood. Ponyfishes provide an excellent system in which to address these questions. The evolutionary relationships of ponyfishes will be reconstructed using DNA sequence data and phenotypic features of the fish's LOS, and examined in light of symbiont patterns of relationship. This project will provide insight into the evolution of luminescence-signaling systems in fishes, the role of sexual selection in ponyfish diversification, coevolutionary interactions in a symbiosis in which the bacterium is acquired with each new generation, and the role of the symbiosis in the biogeographic distribution of the fish and bacterium. The project will provide exposure to fieldwork and training to post-doctoral and student participants in the areas of systematics, symbiosis, ichthyology, coevolution, and biogeography.

美国自然历史博物馆的约翰·斯帕克斯博士获得了一笔赠款，用于研究Leiognathidae(马尾鱼)科鱼类与发光海洋原核生物Leiognathi发光杆菌之间共生的进化、共同进化的相互作用和生物地理学。鱼类宿主丰富，具有重要的经济价值，广泛分布于整个印度-太平洋地区。这种鱼在称为发光器官的食道周围内部结构中拥有密集的细菌共生体，为细菌提供氧气和营养，并在与捕食、反捕食和性别特异信号相关的各种展示中使用细菌发光。大多数种类的雄鱼都表现出极大的放大、结构复杂和物种特有的光器官，而雌性的光器官相对发育较差。推测雄性发光信号的性别选择与光器官系统的形态变化和物种形成有关。尽管基于物种特异性雄性信号的两性生物发光系统的进化和功能在萤火虫中得到了很好的记录，但在脊椎动物中，这些系统却知之甚少。甲鱼提供了一个很好的系统来解决这些问题。将利用DNA序列数据和鱼类LO的表型特征重建马尾鱼的进化关系，并根据共生关系模式进行检查。该项目将深入了解鱼类发光信号系统的进化，性别选择在马尾鱼多样化中的作用，细菌与每一新一代获得的共生共生中的共同进化相互作用，以及共生在鱼类和细菌的生物地理分布中的作用。该项目将为博士后和学生参与者提供系统学、共生学、鱼类学、共同进化和生物地理学领域的实地工作和培训。