Formation and erosion of biogeomorphological structures: A model study on the tube-building polychaete Lanice conchilega
Formation and erosion of biogeomorphological structures: A model study on the tube-building polychaete Lanice conchilega
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DOI：
10.4319/lo.2014.59.4.1297
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发表时间：
2014-07-01
影响因子：
4.5
通讯作者：
Hulscher, Suzanne J. M. H.
中科院分区：
文献类型：
--
作者：
Borsje, Bas W.;Bouma, Tjeerd J.;Hulscher, Suzanne J. M. H.
我们研究了生态系统工程物种的生物特征和种群密度，结合环境因素如何影响生物地貌结构的形成和侵蚀速率，并重点研究了广泛分布的海洋管状多毛动物 Lanice conchilega，它们生活在软底沉积物中形成高达 80 厘米的土丘的斑块中。我们将造管蠕虫建模为薄实心桩，影响阻力和湍流，从而影响局部沉积物动力学，从而影响土堆动力学。水动力模型预测显示，在一群造管蠕虫内部和前面的流速适应水槽实验具有良好的一致性。模拟的平衡土丘高度随着生物性状“管长度”和种群密度的增加而增加，但受潮流强度、水深和颗粒大小的影响很小。在所有情况下，模拟的土丘高度都在现场观察到的土丘高度范围内。造管蠕虫 L. conchilega 的影响超出了其生物结构的空间尺度，并且持续时间比工程生物本身的寿命还要长。
We study how organism traits and population densities of ecosystem engineering species, in combination with environmental factors, affect the formation and erosion rates of biogeomorphological structures, and focus on the widely distributed marine tube-building polychaete Lanice conchilega, which lives in patches that form mounds up to 80 cm high in soft-bottom sediments. We modeled the tube-building worms as thin solid piles that affect drag and turbulence, and thereby the local sediment dynamics and thus mound dynamics. Hydrodynamic model predictions showed good agreement with flume experiments for flow-velocity adaptations both within and in front of a patch of tube-building worms. The modeled equilibrium mound height increased with the organism trait "tube length,'' and with population density, but was only little affected by the strength of the tidal current, water depth, and grain size. In all cases, the modeled mound heights were within the range of the mound heights observed in the field. The effect of the tube-building worm L. conchilega reached beyond the spatial scale of their biogenic structures, and persisted longer than the lifetime of the engineering organism itself.