Stage-Dependent Variation and Association of Microecological Diversity and Water Quality in Static Culture Systems of Hippocampus erectus
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摘要: 线纹海马(Hippocampus erectus)是我国主要养殖海马种类之一,其转料期前后常因水体环境因子的变化引起高死亡率,但其养殖水体微生态多样性与水质状况尚未明确。本研究以转料期前后(幼苗期与成体期)两个阶段的线纹海马养殖水体为研究对象,采样测算海马生长性能指标和测定水体的水质参数;同时采用16S rRNA和18S rRNA高通量测序技术,分别对养殖水体的细菌和真核微生物的群落结构和多样性进行了比较研究;并结合多元统计方法,解析水质参数与微生态群落(以真核微生物群落、细菌群落为代表)之间的关联程度。水质参数分析发现线纹海马成体期养殖水体中氨氮和亚硝酸盐氮的含量显著高于幼苗期。养殖水体的微生态多样性分析可见幼苗期光合自养型藻类为优势类群(如真眼点藻目),寡营养环境适应型细菌为优势类群(如蓝细菌纲);转料后真核微生物结构转向耐胁迫类群(如尖尾藻属),细菌群落转变为耐氮/异养降解型(如红杆菌科、慢杆菌属等)。本研究揭示了线纹海马转料期前后养殖水体微生态群落的变化特征及其与水质因子的关联,为构建线纹海马转料期的微生态调控技术提供了理论依据与实践路径,对推动海马养殖的绿色可持续发展具有重要科学价值。Abstract: Hippocampus erectus is one of the major seahorse species cultured in China. However, high mortality frequently occurs during the feeding transition period, largely driven by fluctuations in water environmental factors. To date, the microecological diversity and water quality characteristics of its culture system remain poorly understood. In this study, cultivation water from H. erectus was investigated across two developmental stages surrounding the feeding transition period, namely the larval stage and adult stage. Growth performance parameters of seahorses and key physicochemical indices of water quality were systematically measured. High-throughput sequencing based on 16S rRNA and 18S rRNA genes was employed to comparatively characterize the community structure and diversity of bacterial and eukaryotic microorganisms, respectively. Furthermore, multivariate statistical analyses were conducted to elucidate the relationships between water quality parameters and microecological communities (represented by bacterial and eukaryotic microbial assemblages). The results showed that ammonia nitrogen (NH3–N) and nitrite nitrogen (NO2-–N) concentrations were significantly higher in the adult-stage cultivation water than in the larval stage. Microecological analysis revealed that photosynthetic autotrophic algae (unclassified_Eustigmatales) and oligotrophic-adapted bacteria (unclassified_Cyanobacteriia) dominated during the larval stage. Following the feeding transition, the eukaryotic microbial community shifted toward stress-tolerant taxa (Oxyrrhis), while the bacterial community transitioned to nitrogen-tolerant and heterotrophic degrading groups (unclassified_Rhodobacteraceae, Lentibacter). These findings demonstrate a clear succession of microbial communities in response to water quality changes during the feeding transition period. This study reveals the changes in the microbial community structure of aquaculture water during the feed transition in the Hippocampus erectus and their correlations with water quality factors. The findings provide a theoretical basis and practical pathways for developing microecological regulation strategies during this period, and contribute to the sustainable development of seahorse aquaculture.
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图 4 线纹海马两个阶段各养殖池的微生态群落门水平组成柱状图
部分门(如unclassified_Eustigmatales对应的Ochrophyta)在NCBI分类数据库中的分类注释为“无等级”,因此它们被归类到未分类的真核生物(unclassified_Eukaryota)。
Fig. 4 Bar chart of microbial community composition at the phylum level in each culture pond of H. erectus at two cultivation stages
Some phylum (unclassified_Eustigmatales corresponding to Ochrophyta) were annotated as “no rank” rather than at the phylum level in the National Center for Biotechnology Information. Therefore, these phylum were assigned to unclassified_Eukaryota during downstream taxonomic classification.
表 1 线纹海马的生长性状
Tab. 1 Growth traits of H. erectus
指标 A池 B池 C池 D池 E池 F池 体长/cm 2.64±0.11b 2.37±0.10c 3.30±0.14a 8.97±0.61b 7.93±0.86c 10.39±0.63a 体重/g 0.04± 0.0037 b0.03± 0.0025 c0.06± 0.0063 a3.05±0.61b 2.19±0.66c 5.10±0.75a 注:同一行数据小写字母不同代表有显著差异(P<0.05)。Different lowercase letters within the same row indicate significant differences (P < 0.05). 表 2 幼苗期线纹海马3口养殖池的水质参数
Tab. 2 Water quality parameters of three culture ponds for juvenile-stage H. erectus
水质参数 A池 B池 C池 平均值 水温/℃ 23.03±0.06 23.40±0.10 23.60±0.10 23.43±0.29 pH 8.00±0.02 7.99±0.01 7.98±0.01 7.99±0.01 溶解氧/mg∙L−1 5.43±0.28 5.07±0.25 5.03±0.40 5.17±0.22 电导率/mS∙cm−1 51.93±0.08 52.50±0.00 52.20±0.00 52.21±0.29 盐度 35.76±0.04 35.86±0.01 35.43±0.01 35.68±0.23 氨氮/mg∙L−1 0.27±0.06b 0.27±0.08b 0.66±0.32a 0.40±0.23 亚硝酸盐氮/mg∙L−1 0.04±0.00b 0.17±0.00a 0.12±0.01a 0.11±0.07 注:同一行数据小写字母不同代表有显著差异(P<0.05)。Different lowercase letters within the same row indicate significant differences (P < 0.05). 表 3 成体期线纹海马3口养殖池的水质参数
Tab. 3 Water quality parameters of three cultureponds for adult-stage H. erectus
水质参数 D池 E池 F池 平均值 水温/℃ 22.60±0.06 22.50±0.10 22.60±0.06 22.54±0.04 pH 7.46±0.04 7.76±0.02 7.57±0.03 7.60±0.15 溶解氧/mg∙L−1 4.49±0.11b 5.09±0.13a 4.33±0.32b 4.64±0.40 电导率/mS∙cm−1 45.38±0.04b 45.39±0.01b 51.53±0.04a 47.43±3.54 盐度 30.97±0.03c 31.07±0.01b 35.74±0.01a 32.59±2.73 氨氮/mg∙L−1 2.26±0.07b 2.09±0.03b 3.36±0.24a 2.57±0.69 亚硝酸盐氮/mg∙L−1 1.26±0.10a 0.21±0.00b 1.19±0.02a 0.89±0.59 注:同一行数据小写字母不同代表有显著差异(P<0.05)。Different lowercase letters within the same row indicate significant differences (P < 0.05). 表 4 线纹海马两个养殖阶段6口养殖池真核微生物的α多样性
Tab. 4 Alpha diversity of eukaryotic microorganisms in six culture ponds of H. erectus at two cultivation stages
养殖阶段 池号 ACE Chao1 Simpson Shannon 幼苗期 A 387.12±38.58a 388.29±40.75a 0.83±0.07a 4.08±0.50b B 227.40±6.71b 232.15±13.10b 0.69±0.06b 3.09±0.27c C 445.27±56.67a 450.14±62.55a 0.94±0.02a 5.37±0.29a 平均值 353.26±103.59 356.86±104.41 0.82±0.12 4.18±1.04 成体期 D 280.15±74.50 279.09±69.58 0.83±0.00c 3.62±0.13c E 372.43±52.42 373.82±48.97 0.96±0.01a 5.87±0.55a F 339.77±47.97 342.75±45.43 0.92±0.01b 4.85±0.31b 平均值 330.78±65.51 331.89±63.84 0.91±0.06 4.78±1.03 注:同一列数据小写字母不同代表同一养殖阶段不同养殖池有显著差异(P<0.05),同一列数据大写字母不同代表两个养殖阶段平均值有显著差异(P<0.05);ACE、Chao1反映物种丰富度(值越高,物种数量越多);Simpson指数反映优势物种主导程度(值越低,优势越明显);Shannon指数综合丰富度与均匀度,反映群落稳定性(值越高,稳定性越强)。Different lowercase letters within the same column indicate significant differences among culture tanks at the same rearing stage (P < 0.05), while different uppercase letters indicate significant differences between mean values of two culture stages (P < 0.05); ACE and Chao1 reflect species richness (higher values indicate a greater number of species); the Simpson index reflects the degree of dominance by dominant species (lower values indicate more pronounced dominance); the Shannon index integrates richness and evenness to reflect community stability (higher values indicate stronger stability). 表 5 线纹海马两个养殖阶段6口养殖池细菌的α多样性
Tab. 5 Alpha diversity of bacteria in six culture ponds of H. erectus at two cultivation stages
养殖阶段 池号 ACE Chao1 Simpson Shannon 幼苗期 A 1332.16 ±485.181324.84 ±487.390.95±0.04 6.99±1.41 B 1083.64 ±215.101080.31 ±214.100.95±0.04 7.08±0.84 C 1024.31 ±47.961018.02 ±48.650.99±0.00 7.35±0.12 平均值 1146.71 ±301.66A1141.06 ±301.94A0.96±0.03 7.14±0.84 成体期 D 975.40±92.42a 966.59±93.62a 0.96±0.01ab 6.34±0.32b E 989.95±133.90a 985.56±136.30a 0.98±0.00a 7.36±0.54a F 690.49±44.76b 685.31±44.55b 0.94±0.02b 5.69±0.31b 平均值 885.28±168.82B 879.15±168.92B 0.96±0.02 6.47±0.81 注:同一列数据小写字母不同代表同一养殖阶段不同养殖池有显著差异(P<0.05),同一列数据大写字母不同代表两个养殖阶段平均值有显著差异(P<0.05);ACE、Chao1反映物种丰富度(值越高,物种数量越多);Simpson指数反映优势物种主导程度(值越低,优势越明显);Shannon指数综合丰富度与均匀度,反映群落稳定性(值越高,稳定性越强;。Different lowercase letters within the same column indicate significant differences among culture tanks at the same rearing stage (P < 0.05), while different uppercase letters indicate significant differences between mean values of two culture stages (P < 0.05); ACE and Chao1 reflect species richness (higher values indicate a greater number of species); the Simpson index reflects the degree of dominance by dominant species (lower values indicate more pronounced dominance); the Shannon index integrates richness and evenness to reflect community stability (higher values indicate stronger stability). -
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