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首页> 外文期刊>Southeastern naturalist >Spatial Distribution of Epiphytic Diatoms on Lotic Bryophytes
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Spatial Distribution of Epiphytic Diatoms on Lotic Bryophytes

机译：茂盛苔藓植物上附生硅藻的空间分布

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In stream ecosystems, bryophytes greatly increase substrate heterogeneity and support a high density and diversity of lotic primary producers, such as epiphytic algae. However, there is little information about flow the spatial distribution and density of epiphytic diatoms varies with respect to bryophyte morphology. This study examined epiphytic diatom communities from the contrasting bryophyte morphologies of mosses and liverworts. We predicted that mosses, with morphologies that create more crevices, would have a higher density of epiphytic diatoms than liverworts, with leaves highly exposed to the turbulence of the stream current. Six species of bryophytes (two mosses and four liverworts) were collected from streams in the Great Smoky Mountains National Park, and 37 species of epiphytic diatoms were identified on these bryophytes. Diatom density was significantly higher on the adaxial leaf surface of mosses compared to the abaxial leaf area (ANOVA, df = 29, P < 0.001). There was no difference in diatom density on either the adaxial or abaxial leaf surfaces of liverworts, and these diatom densities were statistically identical to the density observed on the abaxial surface of moss leaves. The findings of our study support our hypothesis that the morphology of mosses, comprised of leafy whorls, provides a greater level of protection from disturbance than the open, flat nature of leafy liverworts. These findings emphasize that differences in microscale habitats can result in varying diatom distribution and density that may be critical to food-web interactions, such as grazing.
机译：在河流生态系统中，苔藓植物极大地增加了底物的异质性，并支持了大量的初级生水生产者，例如附生藻类。但是，关于苔藓植物的形态，关于附生硅藻的空间分布和密度变化的信息很少。这项研究从苔藓和地艾的苔藓植物形态的对比研究了附生硅藻群落。我们预测，苔藓的形态会产生更多的缝隙，其附生硅藻的密度要比地蒿高，而叶子则高度暴露于水流的湍流中。从大烟山国家公园的溪流中采集了6种苔藓植物（2个苔藓和4个艾蒿），在这些苔藓植物上发现了37种附生硅藻。与背面叶子面积相比，苔藓的背面叶子表面的硅藻密度显着更高（ANOVA，df = 29，P <0.001）。在艾蒿的近轴或近轴叶片表面上的硅藻密度没有差异，并且这些硅藻密度在统计学上与在苔藓叶的近轴表面上观察到的密度相同。我们研究的发现支持我们的假设，即与叶状艾蒿的开放，平坦性质相比，由叶状螺纹构成的苔藓形态提供了更高的防护等级，可免受干扰。这些发现强调，微尺度生境的差异可能导致硅藻分布和密度的变化，这可能对食物网的相互作用（例如放牧）至关重要。

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