In lake ecosystems, pelagic-benthic coupling strength (PBCS) is closely related to foodweb structure and pollutant transport. However, the trophic transfer of antibiotics in a benthic-pelagic coupling foodweb (BPCFW) and the manner in which PBCS influences the trophic magnification factor (TMFs) of antibiotics is still not well understood in the whole lake. Herein, the trophic transfer behavior of 12 quinolone antibiotics (QNs) in the BPCFW of Baiyangdian Lake were studied during the period of 2018–2019. It was revealed that 24 dominant species were contained in the BPCFW, and the trophic level was 0.42–2.94. Seven QNs were detected in organisms, the detection frequencies of ofloxacin (OFL), flumequine (FLU), norfloxacin (NOR), and enrofloxacin (ENR) were higher than other QNs. The ∑QN concentration in all species was 11.3–321 ng/g dw. The TMFs for ENR and NOR were trophic magnification, while for FLU/OFL it was trophic dilution. The PBCS showed spatial-temporal variation, with a range of 0.6977–0.7910. The TMFs of ENR, FLU, and OFL were significantly positively correlated with PBCS. Phytoplankton and macrophyte biomasses showed indirect impact on the TMFs of QNs by directly influencing the PBCS. Therefore, the PBCS was the direct influencing factor for the TMFs of chemicals.

中文翻译：

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水生植物为主的浅湖底栖-中上层耦合食物网中抗生素的营养转移：中上层-底栖耦合强度和基线生物的重要性

在湖泊生态系统中，中上层-底栖耦合强度（PBCS）与食物网结构和污染物输送密切相关。然而，抗生素在底栖-中上层耦合食物网（BPCFW）中的营养转移以及PBCS影响抗生素营养放大因子（TMF）的方式在整个湖泊中仍然没有得到很好的了解。本文研究了2018-2019年白洋淀BPCFW中12种喹诺酮类抗生素（QNs）的营养转移行为。结果表明，BPCFW包含24种优势种，营养级为0.42~2.94。在生物体中检测到7种QN，其中氧氟沙星（OFL）、氟甲喹（FLU）、诺氟沙星（NOR）、恩诺沙星（ENR）的检出频率高于其他QN。所有物种的 ΣQN 浓度均为 11.3–321 ng/g dw。 ENR 和 NOR 的 TMF 是营养放大，而 FLU/OFL 是营养稀释。 PBCS表现出时空变化，范围为0.6977-0.7910。 ENR、FLU和OFL的TMF与PBCS显着正相关。浮游植物和大型植物生物量通过直接影响 PBCS 对 QNs 的 TMF 产生间接影响。因此，PBCS是化学品TMF的直接影响因素。