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首页> 外文期刊>Marine ecology >Influence of beach morphodynamics on the bivalve Donax hanleyanus and Mesodesma mactroides populations in Argentina
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Influence of beach morphodynamics on the bivalve Donax hanleyanus and Mesodesma mactroides populations in Argentina

机译：海滩形态动力学对阿根廷双壳类Donax hanleyanus和Mesodesma mactroides种群的影响

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摘要

Five exposed microtidal sandy beaches of North-eastern Buenos Aires (Argentina) were analysed to evaluate the influence of coastal dynamics on the abundance of the intertidal clams Donax hanleyanus and Mesodesma mactroides over a 1-year period. The physical characterisation of each beach was performed using 15 environmental variables and six morphodynamic indices. The population densities of both clam species were estimated by the number of individuals per strip-transect. Analysis of similarities revealed a significant multivariate environmental difference among beaches, which could be aggregated into a northern and a southern group. The former group was characterised by an intermediate morphodynamic state and by having, in general, high density values for both clam species. The latter was composed of beaches with an intermediate reflective state and showed, in general, low density values. Beach Index and Area showed the lowest temporal variation. Total density values, as well as density values of recruits and adults of D. hanleyanus and M. mactroides did not follow a north-south latitudinal gradient. Spatial and temporal fluctuations of density values were best explained by changes in individual physical variables rather than by changes in composite indices.
机译：对布宜诺斯艾利斯东北部（阿根廷）的五个裸露的潮汐沙滩进行了分析，以评估沿海动力对1年期间潮间蛤Donax hanleyanus和Mesodesma mactroides丰度的影响。使用15个环境变量和6个形态动力学指标对每个海滩进行了物理表征。两种蛤类的种群密度是通过每个带状断面的个体数量估算的。相似性分析表明，海滩之间存在显着的多元环境差异，可以将其汇总为北部和南部组。前一组的特征是处于中等形态动力学状态，并且通常对两种蛤类都具有高密度值。后者由具有中等反射状态的海滩组成，通常显示出较低的密度值。海滩指数和面积显示出最低的时间变化。总密度值，以及新近生D. hanleyanus和M. mactroides的密度和新人的密度值都不遵循南北纬度梯度。密度值的时空波动最好通过单个物理变量的变化而不是通过复合指数的变化来解释。

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  • 来源
    《Marine ecology》 |2009年第2期|198-211|共14页
  • 作者

    Gustavo A. Thompson; Mariana F. Sanchez De Bock;

  • 作者单位

    Departamento de Ecologia, Genetica y Evolucion, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, ArgentinarnFundacion Aquamarina, Buenos Aires, Argentina Consejo Nacional de Investigaciones Cientificas y Tecnicas, Buenos Aires, Argentina Departamento de Ecologia, Genetica y Evolucion, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria - Pabellon II, 1428 Capital Federal, Buenos Aires, Argentina;

    Departamento de Ecologia, Genetica y Evolucion, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina;

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  • 正文语种 eng
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  • 关键词

    bivalves; donax hanleyanus; mesodesma mactroides; morphodynamic index; physical variables; sandy beach; wedge clam; yellow clam;

    机译：双壳类汉纳han中胚层;形态动力学指数物理变量沙滩;楔蛤黄蛤;

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