Maintenacne of Parent-Species Reservoirs in a Complex Hybrid Zone

复杂混合带亲种储层的维护

• 批准号: 9708074
• 负责人: Thomas Hilbish
• 金额: $ 11万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-01-15 至 2000-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9708074&HistoricalAwards=false
• 关键词: Maintenacne; Parent; Species; Reservoirs; Complex

Hilbish 9708074 The PIs have been conducting a detailed analysis of a hybrid zone between two species of marine mussels, Mytilus edulis and M. galloprovincialis that are sympatric in Europe. The PIs' have shown that 1) strong directional selection occurs within hybrid populations that eliminates Mytilus edulis and M. edulis-like hybrids, 2) directional selection is offset by immigration from pure populations of M. edulis, 3) the balance between dispersal and selection is presently stable, and 4) hybridization has been an important feature in the evolutionary history of these species. These studies focus future research in a new direction: the primary issue in understanding the dynamics of this hybrid zone is to determine how pure populations of M. edulis are maintained. The maintenance of pure populations of Mytilus edulis is an essential element of the dynamic equilibrium between dispersal and directional selection that maintains and shapes this hybrid zone. The PI will propose to test the hypothesis that M. edulis has a superior physiological capacity to cope with silt in its diet and that pure populations of this species are selectively maintained in estuarine environments where silt concentrations are high. This hypothesis was suggested by the observation that pure populations of M. edulis are associated with estuaries that have high silt loads and preliminary results from separate studies that indicate that M. edulis may have a much greater absorption efficiencies when exposed to diet containing high concentrations of silt. The PI will also propose a combination of laboratory and field experiments to test this hypothesis. Laboratory experiments will test for the proposed physiological differences between M. edulis and M. galloprovincialis while the field experiments are necessary to demonstrate that these differ ences have significant consequences in nature.

Hilbish 9708074 PI一直在详细分析欧洲同胞的两种海洋贻贝，Mytilus Edulis和Galloprovincialis之间的混合区域。 PIS'表明1）强烈的方向选择发生在杂种种群中，消除了Mytilus Edulis和M. Edulis M. eDulis样杂种，2）方向选择被纯M. Edulis纯种群的移民所抵消，3）分散和分散之间的平衡选择目前是稳定的，4）杂交一直是这些物种进化史上的重要特征。这些研究将未来的研究集中在一个新的方向上：理解该混合区动力学的主要问题是确定如何维持Edulis纯种群。 Mytilus Edulis纯种群的维持是保持和塑造该混合区域的分散和定向选择之间动态平衡的重要元素。 PI将提议检验以下假设：Edulis M.具有较高的生理能力，可以在其饮食中应对淤泥，并且该物种的纯种群在淤泥浓度较高的河口环境中有选择地维持。 这一假设是通过观察结果表明的，即埃德利氏菌的纯种群与具有较高的淤泥负荷的河口有关，并且来自单独研究的初步结果表明，Edulis M.在含有高浓度的饮食时可能具有更大的吸收效率。淤泥。 PI还将提出实验室和现场实验的组合，以检验该假设。实验室实验将测试Edulis和Galloprovincialis M. Galloprovincialis之间提出的生理差异，而现场实验则必须证明这些差异对自然具有重大后果。