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首页> 外文期刊>Estuarine Coastal and Shelf Science >Environmental influence on population dynamics of the bivalve Anomalocardia brasiliana
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Environmental influence on population dynamics of the bivalve Anomalocardia brasiliana

机译：环境对巴西双壳类异常动物种群动态的影响

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Understanding how species respond to the environment in terms of population attributes (e.g. abundance, growth, mortality, fecundity, and productivity) is essential to protect ecologically and economically important species. Nevertheless, responses of macrobenthic populations to environmental features are overlooked due to the need of consecutive samplings and time-consuming measurements. We examined the population dynamics of the filter-feeding bivalve Anomalocardia brasiliana on a tidal flat over the course of one year to investigate the hypothesis that, as accepted for macrobenthic communities, populations inhabiting environments with low hydrodynamic conditions such as tidal flat should have higher attributes than populations inhabiting more energetic habitats (i.e. areas more influenced by wave energy such as reflective and intermediate beaches). This would be expected because the harsh conditions of more energetic habitats force organisms to divert more energy towards maintenance, resulting in lower population attributes. We found that A. brasiliana showed moderate growth and secondary production at the study area. Moreover the recruitment period was restricted to a few months. A comparison with previous studies showed that, contrary to expected, A. brasiliana populations from areas with low hydrodynamic conditions have lower abundance, growth, recruitment and turnover rate. It is likely that morphodynamic characteristics recorded in these environments, such as larger periods of air exposure and lower water circulation, may affect food conditions for filter-feeding species and increase competition. In addition, these characteristics may negatively affect macrobenthic species by enhancing eutrophication processes and anoxia. Overall, our results suggest that models accepted and applied at the macrobenthic community level might not be directly extended to A. brasiliana populations. (C) 2017 Elsevier Ltd. All rights reserved.
机译：了解物种如何根据种群属性（例如丰度，生长，死亡率，繁殖力和生产力）对环境做出反应对于保护具有重要生态和经济意义的物种至关重要。然而，由于需要连续采样和耗时的测量，因此忽略了大型底栖动物对环境特征的响应。我们研究了一年内在潮滩上滤食性双壳类巴西异常动物的种群动态，以调查以下假设：被大型底栖动物群落接受的，居住在水动力条件较低的环境（例如潮滩）中的人口应具有较高的属性而不是居住在精力充沛的栖息地（即受波浪能影响更大的区域，例如反射海滩和中间海滩）的人口。这是可以预期的，因为精力充沛的生境的恶劣条件迫使生物体将更多的能量转移到维护上，从而导致种群数量降低。我们发现在研究区，巴西拟南芥显示适度的生长和次级生产。此外，征聘期被限制为几个月。与先前研究的比较表明，与预期相反，来自水动力条件较低地区的巴西拟南芥种群具有较低的丰度，生长，募集和周转率。在这些环境中记录的形态动力学特征（例如更长的空气暴露时间和较低的水循环）可能会影响滤食性物种的食物条件并增加竞争。此外，这些特征可能通过增强富营养化过程和缺氧而对大型底栖动物产生不利影响。总体而言，我们的结果表明，在大型底栖动物群落一级接受和应用的模型可能不会直接扩展到巴西拟南芥种群。 （C）2017 Elsevier Ltd.保留所有权利。

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