城市河流中的塑料垃圾上的生物膜:社区的组成和活动因基质类型而异
Raúl F Lazcano1, John J Kelly1, Timothy J Hoellein1
1Department of Biology, Loyola University Chicago, Chicago, Illinois, USA.
概括
塑料的特性影响水生生物膜,影响微生物群落和河流生态系统. 虽然生物膜活性在塑料中是相似的,但塑料和天然木质基板之间的社区组成不同.
科学领域:
- 环境微生物学环境微生物学
- 水生生态学 水生生态学
- 聚合物科学 聚合物科学
背景情况:
- 塑料垃圾是水生生态系统中生物膜的常见基质.
- 自然和塑料表面上的生物膜在组成和活性方面表现出相似性和差异.
- 有限的研究将浮性塑料上的生物膜与淡水中的自然表面进行比较,或评估基质大小和连续影响.
研究的目的:
- 在河流环境中比较不同浮性塑料类型和木材上的生物膜的活性和组成.
- 研究基板质地,尺寸和相继阶段对生物膜特征的影响.
- 了解聚合物特性如何塑造生物膜社区及其对城市河流的生态影响.
主要方法:
- 在芝加哥河中将刚性聚乙烯,柔性聚乙烯薄膜,泡聚烯和不同尺寸的木基板化六周.
- 每周测量叶绿素,生物质,呼吸和气流量.
- 在第1,3,6周进行16S和23SrRNA基因测序,以分析细菌和藻类社区的组成.
主要成果:
- 生物膜活性 (叶绿素,生物质,N2流) 在塑料和木质基板上普遍相似,尽管在木材上呼吸率更高.
- 细菌和藻类的丰富性和多样性在聚烯泡和木材上最高.
- 细菌群体的组成在木材和塑料之间有显著差异,而藻类群体在木材,泡聚烯和聚乙烯基板之间有明显的差异.
结论:
- 聚合物特性显著影响水生生态系统中的生物膜α和β多样性.
- 塑料和木材上的不同生物膜群体可以影响塑料污染和相关微生物的传输.
- 了解基板对生物膜的影响对于评估城市河流塑料污染对生态的影响至关重要.
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