Epilithic bacterial and algal colonization in a stream run, riffle, and pool: a test of biomass covariation
Epilithic bacterial and algal colonization in a stream run, riffle, and pool: a test of biomass covariation
复制标题
溪流、浅滩和水池中的附生细菌和藻类定殖：生物量协变的测试
作者：
W. V. Sobczak;T. Burton
比较了三级温带溪流开阔树冠段的河流、冲沟和水池中的浮游细菌和藻类的生物量。在定居3、7、14、21、28和35天后，在未上釉的瓷砖上取样，这些瓷砖附着在塑料托盘上(n=3)，分别放置在三种生境(即Run、Riffle、Pool)上。选择了不同的生境和采样制度，以提供藻类生物量的范围，以便评估附生细菌和藻类生物量之间的潜在协变。不同生境之间以及不同生境内不同托盘之间的叶绿素a和AFDM值均存在显著差异。在整个定殖期内，叶绿素a和Afdm在游动和蓄积过程中都有所增加。在Rifle中，叶绿素a和Afdm在定殖初期迅速增加，然后下降。栖息地的细菌生物量迅速增加，在整个定殖期内，三种生境之间没有显著差异。此外，细菌生物量与三种生境中的任何一个或任何一个采样日的叶绿素a或Afdm都没有相关性。这些结果表明，在某些河流环境中，附生藻类和细菌生物量可能受到独立控制。
Epilithic bacterial and algal biomass were compared among a run, riffle, and pool along an open-canopy section of a third-order, temperate stream. Epilithic biofilms were sampled after 3, 7, 14, 21, 28, and 35 days colonization on unglazed ceramic tiles that were attached to plastic trays (n = 3) placed across each of the three habitats (i.e., run, riffle, pool). The diverse habitats and sampling regime were selected to provide a range in algal biomass so that potential covariation between epilithic bacterial and algal biomass could be assessed. There were significant differences among habitats and among trays within each habitat for both chlorophyll a and AFDM. Chlorophyll a and AFDM increased in the run and pool throughout the colonization period. In the riffle, chlorophyll a and AFDM increased rapidly early in colonization, then decreased. Epilithic bacterial biomass increased rapidly with no significant differences among the three habitats throughout colonization. Further, bacterial biomass did not correlate with either chlorophyll a or AFDM in any of the three habitats or on any of the sampling days. These results suggest that epilithic algal and bacterial biomass may be regulated by independent controls in some stream environments.