The Effect of Grain Size on the Distribution of Small Invertebrates Inhabiting the Beaches of Puget Sound
The Effect of Grain Size on the Distribution of Small Invertebrates Inhabiting the Beaches of Puget Sound
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粒度对普吉特湾海滩小型无脊椎动物分布的影响
DOI：
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发表时间：
1959
期刊：
影响因子：
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通讯作者：
W. Wieser
中科院分区：
文献类型：
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作者：
W. Wieser
在普吉特海湾的五个地方，相对于海岸线的总体配置和水流的方向和力量，它们代表了一系列的递减暴露，里士满海滩是最暴露的，班布里奇岛是最隐蔽的地方。这反映在承印物的组成上，前者的地方具有最粗的承印物，后者的地方具有最细的承印物。在这个水平梯度的垂直方向上，由于潮汐的作用，形成了一个垂直梯度，粗粒级沉积在上层，细粒级沉积在下层潮间带。
The position with respect to the general configuration of the shore-line and the direction and force of the currents of five localities in Puget Sound is such that they represent a series of decreasing exposure, Richmond Beach being the most exposed, Bainbridge Island the most sheltered locality. This is reflected in the composition of the substrate, the former locality having the coarsest, the latter the finest substrate. Perpendicular to this horizontal gradient there runs a vertical gradient due to the tide, the coarse grades being deposited in the upper, the fine grades in the lower intertidal.
The intertidal distribution of at least some of the more common species of invertebrates on the beaches is not so much determined by levels of tidal water as by the pattern of distribution of certain grades of substrate. For example, species of this sort will penetrate into the upper intertidal if the preferred substrate occurs there, but they will remain in the lower intertidal if the substrate is confined to this zone.
On the beaches there exist mixtures of sand which constitute barriers separating major faunal components from each other. It is assumed that substrates with a median diameter of approximately 200µ constitute such a barrier separating the bulk of interstitial sliders from a great number of burrowing animals. The former can move only in sand coarse enough to maintain an interstitial system; the latter, for mechanical reasons, will find fine sand more favorable than coarse. This distinction, however, does not apply to nematodes which are able to move even in the interstices of fine sand. There are various ways in which grain size and shape can influence the distribution of the fauna. These types of relationship are discussed.