Accumulation of microcystins, bacterial community composition and mlrA gene abundance in shrimp culture ponds

IF 2.2 2区农林科学 Q2 FISHERIES Aquaculture Environment Interactions Pub Date : 2024-05-30 DOI:10.3354/aei00479

Xinyu Wang#, Wei Dai#, Xiangdong Bi, Xiaolei Zhang, Dajuan Zhang

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Abstract

ABSTRACT: Cyanobacteria blooms occur frequently in low-salinity shrimp culture ponds. To provide useful information about the potential harm and in situ biodegradation pathway of microcystins (MCs) in these ponds, we investigated accumulation of MCs in shrimp hepatopancreas and sediments, bacterial community composition and mlrA gene abundance in intestines and sediments in 11 Litopenaeus vannamei culture ponds from 9 farms in China. MCs (MC-LR, MC-RR and MC-YR) accumulated in shrimp hepatopancreas and sediments in each sampled pond. Higher bacterial richness and diversity were observed in sediments than in intestines. Two MC-degrading genera (Sphingobium and Roseomonas) were detected in the intestine bacterial community, and 3 MC-degrading genera (Sphingobium, Rhizobium and Acinetobacter) were detected in the sediment bacterial community. The mlrA gene was easier to detect and more abundant in shrimp intestines than in sediments. These results suggest that there was a potential MC hazard in shrimp culture ponds, and the biodegradation pathway in shrimp intestines seemed to be more dependent on the mlr pathway than that in the sediments.

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对虾养殖池塘中微囊藻毒素的积累、细菌群落组成和 mlrA 基因丰度

摘要：低盐度对虾养殖池塘中经常出现蓝藻藻华。为了提供有关这些池塘中微囊藻毒素（MCs）的潜在危害和原位生物降解途径的有用信息，我们调查了中国 9 个养殖场的 11 个万年青养殖池塘中对虾肝胰脏和沉积物中 MCs 的积累、细菌群落组成以及肠道和沉积物中 mlrA 基因的丰度。每个采样池塘的对虾肝胰腺和沉积物中都积累了 MCs（MC-LR、MC-RR 和 MC-YR）。与肠道相比，沉积物中的细菌丰富度和多样性更高。在肠道细菌群落中检测到两个 MC 降解菌属（Sphingobium 和 Roseomonas），在沉积物细菌群落中检测到 3 个 MC 降解菌属（Sphingobium、Rhizobium 和 Acinetobacter）。与沉积物相比，对虾肠道中的 mlrA 基因更容易检测到，含量也更高。这些结果表明，对虾养殖池塘中存在潜在的 MC 危害，与沉积物相比，对虾肠道中的生物降解途径似乎更依赖于 mlr 途径。

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来源期刊

Aquaculture Environment Interactions FISHERIES-MARINE & FRESHWATER BIOLOGY

CiteScore

4.90

自引率

13.60%

发文量

审稿时长

>12 weeks

期刊介绍： AEI presents rigorously refereed and carefully selected Research Articles, Reviews and Notes, as well as Comments/Reply Comments (for details see MEPS 228:1), Theme Sections and Opinion Pieces. For details consult the Guidelines for Authors. Papers may be concerned with interactions between aquaculture and the environment from local to ecosystem scales, at all levels of organisation and investigation. Areas covered include: -Pollution and nutrient inputs; bio-accumulation and impacts of chemical compounds used in aquaculture. -Effects on benthic and pelagic assemblages or processes that are related to aquaculture activities. -Interactions of wild fauna (invertebrates, fishes, birds, mammals) with aquaculture activities; genetic impacts on wild populations. -Parasite and pathogen interactions between farmed and wild stocks. -Comparisons of the environmental effects of traditional and organic aquaculture. -Introductions of alien species; escape and intentional releases (seeding) of cultured organisms into the wild. -Effects of capture-based aquaculture (ranching). -Interactions of aquaculture installations with biofouling organisms and consequences of biofouling control measures. -Integrated multi-trophic aquaculture; comparisons of re-circulation and ‘open’ systems. -Effects of climate change and environmental variability on aquaculture activities. -Modelling of aquaculture–environment interactions; assessment of carrying capacity. -Interactions between aquaculture and other industries (e.g. tourism, fisheries, transport). -Policy and practice of aquaculture regulation directed towards environmental management; site selection, spatial planning, Integrated Coastal Zone Management, and eco-ethics.