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首页> 外文期刊>Lakes & Reservoirs >Recruitment of Heliozoa, rhizopods and rotifers from the sediments of an extremely acidic lake during spring and early summer
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Recruitment of Heliozoa, rhizopods and rotifers from the sediments of an extremely acidic lake during spring and early summer

机译：在春季和初夏期间，从一个极酸性的湖泊的沉积物中招募Heliozoa，根茎类和轮虫

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The goal of this study was to investigate the recruitment of zooplankton from the littoral sediment of Lake 111, an acidic lake in north-east Germany, in April (spring) and June (early summer), and its role in coupling the benthos and the pelagic. Maximum heliozoan and rhizopod recruitment occurred in early summer from sediment cores incubated at ambient water temperatures (20℃). Conversely, recruitment of the rotifer Cephalodella sp. was highest in spring at ambient spring temperatures of 12℃. A combination of passive and active recruitment processes is likely responsible. The seasonal abiotic and biotic sediment characteristics were relatively constant and therefore not likely responsible for the observed temporal recruitment pattern. The sediment water and carbon content ranged from 20 to 50% (mean = 29 ± 6% standard deviation) and 2-12% (mean = 5 ± 2% standard deviation), respectively. Similarly, there was little variation in the chlorophyll-a (mean = 0.2 ± 0.2 μg Chl-a g~(-1) dry weight = 6.1 ± 3.9 mg Chl-a m~(-2)). The in situ sediment bacterial density (0.82 × 10~9 ± 0.26 × 10~9 g~(-1) dry weight = 1.01 × 10~9 ± 0.34 × 10~9 cells cm~(-3)) was high. In contrast, the abundance of zoobenthos and their resting stages was low ( < 25 individuals cm~(-3), and mean of 90 ± 75 cysts cm~(-3), respectively), with no temporal pattern being observed. Temperature was the only abiotic factor influencing recruitment. This study suggests that, even in relatively young, chemically extreme lakes, the benthos can play an important role in whole lake microbial processes and zooplankton community composition. Such benthic repositories of resting stages potentially provide protection against adverse environmental changes.
机译：这项研究的目的是调查4月（春季）和6月（初夏）德国东北部一个酸性湖111湖沿岸沉积物中的浮游动物募集及其在将底栖动物和底栖动物耦合方面的作用。中上层夏季初，在环境水温（20℃）下孵育的沉积物芯中最大量的日生动物和根茎类动物募集。相反，轮虫Cephalodella sp。的招募。在春季春季温度为12℃时最高。被动和主动招聘过程的结合可能是负责任的。季节非生物和生物沉积物特征相对恒定，因此不太可能造成观察到的临时征募模式。沉积物的水和碳含量分别为20％至50％（平均值= 29±6％标准偏差）和2-12％（平均值= 5±2％标准偏差）。同样，叶绿素-a几乎没有变化（平均值= 0.2±0.2μgChl-a g〜（-1）干重= 6.1±3.9 mg Chl-a m〜（-2））。原位沉积物细菌密度高（0.82×10〜9±0.26×10〜9 g〜（-1）干重= 1.01×10〜9±0.34×10〜9细胞cm〜（-3））。相反，底栖动物的丰度及其休息阶段很低（分别小于25个人cm〜（-3），平均囊肿平均cm〜（-3）为90±75个囊肿），没有观察到时间规律。温度是影响招募的唯一非生物因素。这项研究表明，即使在相对年轻，化学极端的湖泊中，底栖生物也可以在整个湖泊的微生物过程和浮游动物群落组成中发挥重要作用。这种静止的底栖储存库可能提供保护，以防止不利的环境变化。

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