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Production of the Copepod Pseudodiaptomus forbesi Is Not Enhanced by Ingestion of the Diatom Aulacoseira granulata During a Bloom
Estuaries and Coasts ( IF 2.7 ) Pub Date : 2020-10-10 , DOI: 10.1007/s12237-020-00843-9
Michelle Jungbluth , Calvin Lee , Cheryl Patel , Toni Ignoffo , Brian Bergamaschi , Wim Kimmerer

In 2016, a massive bloom of the chain-forming diatom Aulacoseira granulata occurred in the upper San Francisco Estuary, California, with chlorophyll concentrations up to 75 μg Chl L−1. In this study, quantitative PCR was used to investigate consumption of the bloom organism by the numerically dominant zooplankter Pseudodiaptomus forbesi (Copepoda: Calanoida) and to estimate the contribution of the bloom to egg production. Copepods were collected on four transects during May and June 2016; egg production rates were somewhat elevated above previous rates measured in the estuary. Ingestion of A. granulata was highest on the first sampling day, just after the peak of the bloom, ranging from 175 to 945 cells copepod−1 day−1. One month later ingestion rates dropped to 0–130 cells copepod−1 day−1, despite continued dominance of A. granulata in the plankton. Ingestion of A. granulata provided from 0 to 21% (median 1%) of the estimated daily carbon required for growth and reproduction of P. forbesi. Although the copepods probably obtained nutrition from a microbial food web stimulated by the bloom, monitoring data showed little demographic response to this bloom. Thus, a massive diatom bloom in an unproductive estuary provided only a minor stimulus through an abundant consumer to the pelagic food web.



中文翻译:

盛开期间食硅藻Aulacoseira granulata不会增强Not足类伪diaptomus forbesi的产量

2016年,在加利福尼亚州上旧金山河口发生了链状形成的硅藻Aulacoseira granulata的大量开花,叶绿素浓度高达75μgChl L -1。在这项研究中,定量PCR被用于调查数量占主导地位的浮游动物Pseudodiaptomus forbesi)(pe足类:Calanoida)对开花生物的消耗,并估计开花对产蛋量的贡献。2016足类动物于2016年5月和6月在四个样带上采集; 卵的生产速度比河口以前测得的速度有所提高。刚好在开花高峰之后的第一个采样日,颗粒状土壤杆菌的摄入量最高,介于175到945个细胞co足类-1之间-1天。一个月后,尽管浮游生物中的颗粒线虫继续占主导地位,但摄食率下降至0-130细胞cells足类-1-1。的摄取A. granulata从0提供给用于的生长和繁殖所需的估计每日碳的21%(中值1%)P. forbesi。尽管the足类动物可能是从盛开的微生物食物网中获取了营养,但监测数据显示,人口对这种盛开的反应很小。因此,在非生产性河口大量硅藻大量繁殖,通过大量消费者向中上层食物网提供了较小的刺激。

更新日期:2020-10-11
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