Spatio-temporal changes of bacterioplankton communities in Litopenaeus vannamei desalinated ponds and their responses to physicochemical factors
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摘要: 浮游细菌调控是对虾养殖水体环境控制策略的核心内容,探究浮游细菌群落构建的一般规律,可进一步推动对虾养殖水体水质调控技术的研究。运用16S rRNA高通量测序技术,对凡纳滨对虾 (Litopenaeus vannamei) 淡化养殖池塘进行了12次周际调查。结果显示,48个样品共获得2 854个操作分类单元(Operational taxonomic units,OTU, 97%相似性),序列比对发现古细菌2门1纲1科1属,细菌30门59纲98目199科433属,其中优势菌群25属。优势菌群在组成上有较高的相似性,但各池优势菌群在分布和相对丰度变动上有较大差异。各池系统发育多样性指数总平均值为77.57,变幅为24.39~111.65;香农多样性指数总平均值为3.96,变幅为2.64~5.06;物种丰富度指数总平均值为716,变幅为229~1 054。非度量多维标度分析 (Non-metric multidimensional scaling, NMDS) 表明各池塘浮游细菌群落在养殖初期差异较大,中、后期差异减小,冗余分析 (Redundancy analysis, RDA) 显示活性磷、碱度、溶解氧和硫化物可显著影响浮游细菌的群落结构。Abstract: The regulation of bacterioplankton is the core content of the environmental control strategy in shrimp aquaculture. Exploring the general rules of the construction of bacterioplankton community can further promote the research on water quality regulation for shrimp ponds. Using 16s rRNA high-throughput sequencing technology, we conducted 12 weekly surveys in Litopenaeus vannamei desalinated ponds.The results indicate that a total of 2 854 OTUs (97% similarity) were obtained from 48 samples (Archaea belonged to 2 phyla, 1 class, 1 family and 1 genus; and bacteria belonged to 30 phyla, 59 classes, 98 orders, 199 families and 433 genera, among which 25 genera were dominant flora). The dominant flora had high similarity in the composition, but with great differences in the distribution and relative abundance in each pond. The total average phylogenetic diversity index was 77.57, ranging from 24.39 to 111.65; the total average Shannon diversity index was 3.96, ranging from 2.64 to 5.06; the total average species richness index was 716, ranging from 229 to 1 054. NMDS analysis shows that the community structure of bacterioplankton in each pond varied greatly at the early stage of aquaculture, but not so greatly at the middle and late stages. The results of redundancy analysis shows that the labile phosphorus, total alkalinity, dissolved oxygen and sulfide were the main environmental factors affecting the distribution characteristics of community structure of bacterioplankton.
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图 3 3口池塘的α多样性系数分析
注:箱体上中下线分别为75、50 (中位数) 和25分位数,轴须线最长不超过1.5倍箱体范围,黑色空心圆表示平均数;差异显著性用* (P<0.05)、** (P<0.01)以及*** (P<0.001) 表示;图中的样本量:A:n=22、B:n=12、C:n=12。
Figure 3. α diversity index analysis of bacterioplankton in three ponds
Note: The upper, middle and lower lines of the box are 75, 50 (Median) and 25 quantiles, respectively. The maximum length of whiskers shall not exceed 1.5 times of the box range. The black hollow circles represent the average values. The significant differences were represented by * (P<0.05), ** (P<0.01) and *** (P<0.001). The numbers of replicated samples in this figure are: A: n=22; B: n=12; C: n=12.
图 7 优势菌群分布和群落多样性 (H') 与主要理化因子之间的关系 (II型标尺)
注:Aci. 不动杆菌属;Aer. 气单胞菌属;Fla. 黄杆菌属;Gem. 芽殖杆菌属;GpI. GpIIa;Ilu. 微酸菌属;Lim. 湖栖菌属;Pol. 多核杆菌;Rho. 红杆菌属;Sed. 沉积物杆状菌属;Spa. 发光细菌属;Sph. 鞘脂菌属。
Figure 7. Species associations of dominan flora and diversity (H) with environmental factors (Scaling II)
Note: Aci. Acinetobacter sp.; Aer. Aeromonas sp.; Fla. Flavobacterium sp.; Gem. Gemmobacter sp.; GpI. GpIIa; Ilu. Ilumatobacter sp.; Lim. Limnohabitans sp.; Pol. Polynucleobacter sp.; Rho. Rhodobacter sp.; Sed. Sediminibacterium sp.; Spa. Spartobacteria genera incertae sedis; Sph. Sphingomonas sp..
表 1 凡纳滨对虾养殖池塘水体主要理化因子
Table 1. Environmental factors in L. vannamei ponds
环境因子
Environmental factor池塘A
Pond A池塘B
Pond B池塘C
Pond C水温 Temperature/℃ 26.19±2.01 26.15±1.57 26.37±2.00 pH 8.10±0.50 8.29±0.37 8.30±0.38 溶解氧质量浓度 DO/(mg·L−1) 8.00±0.68 8.45±1.17 8.11±1.15 铵态氮质量浓度 NH4-N/(mg·L−1) 0.45±0.73 0.44±0.39 0.33±0.27 亚硝酸氮质量浓度 NO2-N/(mg·L−1) 0.01±0.01 0.01±0.01 0.01±0.01 硝酸态氮质量浓度 NO3-N/(mg·L−1) 0.34±0.44 0.41±0.42 0.48±0.53 活性磷质量浓度 PO4-P/(mg·L−1) 0.12±0.14 0.37±0.24 0.22±0.28 活性硅酸盐质量浓度 SiO3-Si/(mg·L−1) 11.2±3.55 12.38±7.38 4.03±2.98 高锰酸盐指数 CODMn/(mg·L−1) 8.34±7.19 6.12±3.18 5.34±2.91 叶绿素 a 质量浓度 Chl-a/(mg·L−1) 75.78±131.01 56.13±42.81 58.36±61.48 硫化物质量浓度Sul/(mg·L−1) 0.03±0.04 0.02±0.01 0.02±0.01 矿化度质量浓度 Mineralization degree/(mg·L−1) 1209.44±2445.58 813.39±171.69 814.35±41.91 碱度 ALK/(mg·L−1) 138.18±12.06 115.32±33.82 84.46±14.73 总硬度 Total hardness/(mg·L−1) 362.76±395.28 476.5±227.34 349.36±60.18 表 2 各样本有效序列数据统计
Table 2. Valid sequences of each sample
样品
Sample条形码
Barcode有效序列
Valid sequence/条碱基数
Base number平均长度
Mean length/bp最短序列长度
Min. length/bp最长序列长度
Max. length/bpS1 GTAACA 82 736 34 604 966 418.26 363 469 S2 CCAGAC 81 905 34 619 470 422.68 361 476 S3 GGTGAA 56 859 23 683 959 416.54 367 475 S4 TGCATC 85 212 35 667 198 418.57 353 469 S5 TCGACC 83 246 34 547 936 415.01 365 470 S6 GTCGCG 73 829 30 547 465 413.76 362 453 S7 CGGATG 83 662 34 668 763 414.39 356 465 S8 GTGAAA 84 384 34 811 366 412.54 350 466 S9 ATCTTG 100 945 41 590 813 412.01 350 452 S10 TATGCA 73 801 30 659 241 415.43 352 459 S11 GTAACA 86 471 35 924 249 415.45 354 471 S12 GCGAGG 90 432 37 722 526 417.14 351 465 S13 CACGAT 54 439 22 735 194 417.63 373 465 S14 GCGGTA 44 227 18 478 585 417.81 352 471 S15 TATCGA 61 431 25 638 627 417.36 359 473 S16 ATCACG 52 384 21 792 829 416.02 376 471 S17 CGGATG 99 211 41 215 038 415.43 360 473 S18 CGCATA 100 001 41 427 908 414.27 372 476 S19 TGCATC 65 712 27 246 907 414.64 359 476 S20 TCAGTA 76 029 31 690 841 416.83 362 471 S21 CGGCAC 75 202 31 405 455 417.61 364 469 S22 ATCACG 71 605 30 328 221 423.55 352 470 S23 CGGATG 63 358 26 635 233 420.39 367 470 S24 GTGAAA 56 429 23 698 925 419.98 350 471 S25 TCAGTA 92 400 38 487 742 416.53 355 435 S26 GAAGTG 87 305 37 043 958 424.31 368 448 S27 TCGACC 94 075 39 472 386 419.58 360 464 S28 CTTGTA 52 273 22 054 548 421.91 373 472 S29 GTTTCG 44 697 18 684 447 418.02 360 462 S30 ATCTTG 59 737 25 072 871 419.72 365 465 S32 GCCATC 78 462 32 993 239 420.5 357 474 S33 TGTGTT 69 613 29 167 734 419.00 351 474 S34 CTTGTA 56 083 23 551 548 419.94 356 471 S35 GTTTCG 45 701 18 993 334 415.60 359 464 S36 TTCGTA 46 337 19 212 573 414.63 356 468 S37 CCAGAC 51 978 21 598 326 415.53 372 436 S38 AGCAGT 77 233 31 835 991 412.21 350 470 S39 GAGGAA 75 226 31 060 291 412.89 370 468 S40 AAGGTA 46 920 19 633 227 418.44 352 450 S41 ATCACG 43 983 18 242 559 414.76 352 469 S42 TAGGAC 66 639 27 702 230 415.71 356 470 S43 TGGACG 49 206 20 369 621 413.97 357 472 S44 AGAACA 50 322 20 765 128 412.65 356 469 S45 GGTGTG 41 169 17 011 770 413.22 350 471 S46 AACTAT 67 691 28 070 176 414.68 357 468 S47 ACTGCG 60 220 25 559 117 424.43 359 474 S48 TGTGTT 94 261 39 467 506 418.7 355 474 S49 TAGGAC 86 904 36 530 365 420.35 353 467 -
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