Recovery of soft sediment communities and habitats following physical disturbance
Recovery of soft sediment communities and habitats following physical disturbance
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DOI：
10.1016/s0022-0981(02)00541-5
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发表时间：
2003-02-12
影响因子：
2
通讯作者：
Warwick, RM
中科院分区：
文献类型：
--
作者：
Dernie, KM;Kaiser, MJ;Warwick, RM
对软沉积物生境的物理扰动会破坏沉积物结构，并可能导致常驻生物群的死亡或迁移。目前用于量化海底生物组合对物理扰动的反应的方法既费时又昂贵，需要分析一系列时间样本，以确定受扰动区达到与相邻对照区相似的状况所需的时间（恢复时间）。我们设计了一个实验，研究了两种强度的物理干扰的栖息地和动物的庇护砂滩，以确定是否可以预测的栖息地的物理属性的生物区系的恢复的影响。底栖生物，社区恢复较低强度的干扰发生在64天的干扰，而恢复后，较高强度的干扰没有发生，直到208天后，在这个网站的干扰。沉积物粒度和有机物含量的百分比没有改变作为一个结果，在任何治疗的干扰。然而，在扰动坑中保留的水的深度随着时间的推移而减少，并与群落结构的时间变化相关。因此，尽管这是测量的最粗略的物理参数，但它最好地描述了动物群的恢复过程，并可能包含了同时发生的其他更微妙的栖息地变化的整套变化。通过量化不同软沉积物生境中物理特征的持久性，或许可以制定一个更可靠和更快速的框架，用于评估物理扰动影响的持久性。(C)2002 Elsevier Science B.V.保留所有权利。
Physical disturbance in soft sediment habitats disrupts the sediment structure and can lead to the death or emigration of resident biota. Current methods used to quantify the response of benthic assemblages to physical disturbance are time consuming and expensive, requiring the analysis of a time series of samples to ascertain the time taken for a disturbed area to converge on a condition similar to that found in adjacent control areas (the recovery time). We designed an experiment that studied the effects of two intensities of physical disturbance on both the habitat and fauna of a sheltered sand flat to ascertain whether the recovery of the biota could be predicted from physical attributes of the habitat. Benthic, community recovery from the lower intensity disturbance occurred within 64 days of the disturbance, whereas recovery after higher intensity disturbance did not occur until 208 days post-disturbance at this site. Sediment granulometry and percentage organic content did not alter as a result of the disturbance in either treatment. However, the depth of water that remained in the disturbed pits decreased with time, and correlated with the temporal changes in community structure. Thus although this was the most crude physical parameter measured it best described the recovery process of the fauna and may encapsulate the entire suite of other more subtle habitat changes that occur at the same time. By quantifying the persistence of physical features in different soft sediment habitats it might be possible to develop a more amenable and rapid framework for assessing the longevity of the effects of physical disturbance. (C) 2002 Elsevier Science B.V. All rights reserved.