Dissertation Research: Larval Brooding by the Freshwater Mussel Anodonta cataracta

论文研究：淡水贻贝无齿蚌幼虫的育雏

• 批准号: 9001345
• 负责人: Ronald Dimock
• 金额: --
• 依托单位: Wake Forest University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-15 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9001345&HistoricalAwards=false
• 关键词: Dissertation; Research; Larval; Brooding; Freshwater

The life cycle of freshwater unionid mussels is atypical among bivalves and involves both a free-living adult and a parasitic larva, the glochidium. Following fertilization, developing embryos are incubated in the water tubes of the mother's gills where they may remain for several months before being released into the water column and becoming parasitic on fish. The principal objective of this study is to assess the morphological and physiological changes that occur within the gills of brooding female Anodonta cataracta, an abundant freshwater mussel in North Carolina. During brooding, two of the mussel's four gills become packed with nearly a million glochidia, causing the gills to swell to up to thirty times their non-brooding size. The major goals of the proposed research include quantifying the morphological changes that occur within the marsupial gills, comparing the pumping and filtration dynamics of brooding and non-brooding mussels, determining the effect of brooding on oxygen uptake and oxygen extraction efficiency of mussels, and assessing the activity of the cilia responsible for irrigation both the marsupial and non-marsupial gills. The results will provide a more complete understanding of the reproductive biology of A. cataracta, especially the effect of glochidial brooding and release on the physiology and gill morphology of adult females. This information also may have application for the management and conservation of other freshwater bivalves including threatened and endangered species.

淡水蚌类的生活史在双壳类中是不典型的，包括一个自由生活的成年和一个寄生的幼虫，钩介虫。受精后，发育中的胚胎在母亲鳃的水管中孵化，在那里它们可能会停留几个月，然后被释放到水柱中并寄生在鱼身上。本研究的主要目的是评估的形态和生理变化，发生在鳃的育雏女性Anodonta cataracta，丰富的淡水贻贝在北卡罗来纳州。在育雏期间，贻贝的四个鳃中的两个会挤满近一百万个钩介虫，导致鳃膨胀到非育雏时的30倍。拟议的研究的主要目标包括量化的形态变化，发生在有袋类鳃，比较的泵和过滤动力学的育雏和非育雏贻贝，确定育雏对贻贝的氧摄取和氧提取效率的影响，并评估活动的纤毛负责灌溉有袋类和非有袋类鳃。研究结果将为全面了解A.白内障，特别是钩介幼虫育雏和释放对成年雌性的生理和鳃形态的影响。这些信息也可用于管理和保护其他淡水双壳类，包括受威胁和濒危物种。