Developmental Variability and Heterochronic Variation in Poeciliid Fishes

鳅科鱼类的发育变异和异时变异

• 批准号: 9307245
• 负责人: Richard Strauss
• 金额: $ 18万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-15 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9307245&HistoricalAwards=false
• 关键词: Developmental; Variability; Heterochronic; Variation; Poeciliid

9307245 Strauss Heterochrony, the alteration of timing within ontogeny (development) resulting in accelerated or retarded developmental rates of structures with respect to ancestral conditions, provides an important developmental mechanism for creating morphological diversity among species. This research involves a detailed examination of patterns of morphological and developmental variability in several divergent lineages of poeciliid fishes, a group of livebearing freshwater fishes occurring throughout Middle America. Various aspects of development will be examined including allometric growth gradients (size/shape relationships), absolute and relative growth rates under standardized conditions, and the relative timings of ossification and other discrete ontogenetic events. The overall patterns seen for different species will be interpreted within a phylogenetic framework. %%% The significance of this research is that it will contribute to a more detailed knowledge of the development of poeciliid fishes, and these results can be related to other fish groups. The research also provides valuable information on patterns of morphological change associated with the size and shape of characteristics as well as the timing of development. Finally, this research will utilize this interesting group of fish to develop analytical procedures that can be used to examine growth and development in other organisms. ***

小行星9307245 异时性是个体发育（发育）中时间的改变，导致结构相对于祖先条件的发育速率加快或减慢，为创造物种之间的形态多样性提供了重要的发育机制。 本研究涉及的形态和发育变异的模式在几个不同的谱系poeciliid鱼，一组livebearing淡水鱼发生在整个中美洲的详细检查。 将检查发育的各个方面，包括异速生长梯度（大小/形状关系），标准化条件下的绝对和相对生长率，以及骨化和其他离散个体发育事件的相对时间。 不同物种的总体模式将在系统发育框架内进行解释。本研究的意义在于有助于更详细地了解Poeciliid鱼类的发育，并且这些结果可以与其他鱼类组相关联。 该研究还提供了与特征的大小和形状以及发育时间相关的形态变化模式的宝贵信息。 最后，这项研究将利用这组有趣的鱼来开发分析程序，可用于检查其他生物的生长和发育。***