Numbers, Sizes, and Types of Diatoms Around Estuaries for a Diatom Test
Numbers, Sizes, and Types of Diatoms Around Estuaries for a Diatom Test
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DOI：
10.1097/paf.0b013e318221b857
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
E. Kakizaki;S. Kozawa;M. Sakai;N. Yukawa
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文献类型：
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作者：
E. Kakizaki;S. Kozawa;M. Sakai;N. Yukawa
我们在涨潮和退潮时从 2 条河流河口周围的不同地点采集了 68 个淡水、咸水和海水样本。海水在河口上游约 2.4 公里（现场盐度为 2.2%）和 1.2 公里（1.8%）处流动，但直到入海口为止地表基本上都是淡水。每个地点每 50 毫升水含有 69 至 22,200 个硅藻，数量因深度和地点相距仅约 1.2 公里而异。硅藻的大小范围为 2.8 至 429 m（平均范围为 16.1-59.2 m）。大型羽状硅藻栖息在淡水区域，大部分在到达大海之前沉积下来。海水区20m以下羽状硅藻数量减少。离海越近，中心硅藻的数量越多，海水中含有较大的中心硅藻。与含有少量海水的咸水不同，含有大量海水的咸水很容易被海洋硅藻的组合所识别，因为海洋硅藻可以在河口周围的淡水中找到。潮汐和河流的性质经常改变同一河口地点的硅藻土组合。建议对水介质进行法医解释以推断溺水地点时要小心。
We collected 68 fresh, brackish, and seawater samples from various sites around the estuaries of 2 rivers at high and low tides. Seawater flowed approximately 2.4 (salinity, 2.2% at the site) and 1.2 km (1.8%) upstream of the estuaries, but the surface comprised essentially fresh water up to the mouth. Sites contained 69 to 22,200 diatoms/50 mL of water, and the numbers varied by depth and at sites separated by only approximately 1.2 km. Diatoms ranged from 2.8 to 429 m (mean range, 16.1-59.2 m) in size. Large pennate diatoms populated fresh water areas, and most sedimented before reaching the sea. Numbers of pennate diatoms of less than 20 m were decreased in areas of seawater. Numbers of centric diatoms tended to increase nearer the sea, and seawater contained large centric diatoms. Brackish water containing large volumes of seawater was easily discriminated by assemblages of marine diatoms, unlike that containing a little seawater, because marine diatoms could be found in fresh water around estuaries. Tides and the nature of the river often altered diatomaceous assemblages at the same estuarial sites. Caution is recommended for forensic interpretation of aqueous media to deduce drowning sites.