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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Short-term succession dynamics of macrobenthos in a salinity-stressed estuary
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Short-term succession dynamics of macrobenthos in a salinity-stressed estuary

机译：盐度河口大底栖动物的短期演替动力学

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It is postulated that early succession is influenced by environmental conditions directly after a disturbance event and the temporal scale of succeeding disturbances. For example, Rincon Bayou, Texas, U.S.A. is an estuary stressed by large fluctuations in salinity ranging from oligohaline to hypersaline conditions; leading to the question: are benthic succession dynamics interrupted or affected by the temporal scale of salinity fluctuations? To answer this question, succession dynamics were investigated by manipulation of 1) initial environmental conditions, and 2) time between severe disturbances. The influence of environmental conditions and time course of succession were investigated by comparing two experiments. A synoptic-deployment experiment where samples were deployed at the same environmental conditions and a synoptic-retrieval experiment where samples were collected from deployments under different environmental conditions. Both experiments were conducted at varying time courses of 2-, 4- and 8-week durations between severe disturbances. Severe disturbances were simulated with defaunated sediment. Ambient conditions were simultaneously sampled as a reference. Environmental conditions directly affected succession. In the ambient study, succession occurred in conjunction with changes in environmental conditions. In the synoptic-deployment and synoptic-retrieval studies, environmental conditions at the time of retrieval were more important in determining community structure than deployment duration or initial environmental conditions at time of deployment. Initial environmental conditions were not the primary mechanism in regulation of succession because succession is likely interrupted by frequent salinity disturbances. The salinity-stressed estuary of Rincon Bayou appears to be in a constant state of early and intermediate succession because of frequent salinity-related disturbances.
机译：据推测，在干扰事件发生后，环境条件直接影响早期演替；随后的干扰发生在时间尺度上。例如，美国得克萨斯州的林孔巴约（Rincon Bayou）是一个河口，盐度从低盐度到高盐度不等，波动很大；引出一个问题：底栖演替动态是否受到盐度波动的时间尺度的干扰或影响？为了回答这个问题，通过操纵1）初始环境条件和2）严重干扰之间的时间来研究继承动力学。通过比较两个实验，研究了环境条件和演替时间过程的影响。在相同环境条件下部署样本的天气部署实验，以及在不同环境条件下从部署环境收集样本的天气回顾实验。两次实验均在严重干扰之间的2、4和8周的不同时间过程中进行。对严重扰动进行了模拟，并使用了沉积物。同时采样环境条件作为参考。环境条件直接影响了继承。在环境研究中，演替是随着环境条件的变化而发生的。在概要部署和概要检索研究中，取回时的环境条件在确定社区结构方面比部署持续时间或部署时的初始环境条件更为重要。初始环境条件不是调控演替的主要机制，因为演替很可能会因频繁的盐度干扰而中断。由于频繁的盐度相关干扰，Rincon Bayou的盐度胁迫河口似乎处于早期和中期演替的恒定状态。

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