珠江河网密齿苦草种群衰退的表观性状特征指示
Morphological traits indicating the decline of of Vallisneria denseserrulata population in the Pearl River Network
投稿时间:2022-05-10  修订日期:2022-07-07
DOI:
中文关键词:密齿苦草  表观性状  有性繁殖  种群恢复  珠江河网
英文关键词:Vallisneria denseserrulata  morphological trait  sexual propagation  population recovery  Pearl River network
基金项目:中国水产科学研究院中央级公益性科研院所基本科研业务费专项资金资助(2022SJ-XT3; 2018-SJ-ZH06);国家自然科学基金(31500434)。
作者单位E-mail
李毅 :中国水产科学研究院珠江水产研究所 leeyi101@163.com 
杨婉玲 :中国水产科学研究院珠江水产研究所 yangwanling@prfri.ac.cn 
王超 :中国水产科学研究院珠江水产研究所 wangchao@prfri.ac.cn 
赖子尼 :中国水产科学研究院珠江水产研究所 zinilai01@163.com 
李海燕 :中国水产科学研究院珠江水产研究所 lihaiyan@prfri.ac.cn 
刘乾甫 :中国水产科学研究院珠江水产研究所 liuqianfu@prfri.ac.cn 
高原 :中国水产科学研究院珠江水产研究所 gaoyuan@prfri.ac.cn 
麦永湛 :中国水产科学研究院珠江水产研究所 maiyongzhan@prfri.ac.cn 
曾艳艺* :中国水产科学研究院珠江水产研究所 yanyizeng84@163.com 
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中文摘要:
      密刺苦草是珠江河网水草床中占据优势但面临急剧衰退风险的种类。为探讨珠江河网密刺苦草现存种群衰退特征及其主要影响因素,本研究利用冗余分析(RDA)和主成分分析(PCA)等多元统计方法分析了珠江河网水草床2018年现存密刺苦草(Vallisneria denseserrulata)外海(S3)、小塘(S5)和榄核(S8)3个站位中密刺苦草的株高、株重、叶片指标等参数与环境因子关系,并结合2019年该区域密刺苦草种群急剧衰退情况探讨密刺苦草衰退前的表观性状特征指示意义。结果显示,珠江河网密刺苦草衰退前一年度种群表观性状时空分布特征差异明显,S3和S8站位密刺苦草株高、株重等从2月、8月至12月期间呈现先增加后下降的趋势,而S5站位密刺苦草上述指标持续增加;12月,不同站位密刺苦草种群出现了生长特征分化,S5站位密刺苦草进入了花果期,而S3和S8站位密刺苦草则开始衰退。RDA结果显示,密刺苦草株高主要受水深、沉积物中粒径组分及沉积物总磷含量等影响,株重主要受沉积物总磷含量影响,而不同站位群丛受到不同环境因子的影响制约。PCA结果显示,密刺苦草的9种表观性状可表征其克隆生长力、有性繁殖力和多年生长力,并决定其种群维持策略:一种以S5站位为代表,种群越冬期保持持续生长力,并进行有性繁殖资源分配,能适应环境变化,种群在次年得以维持和延续;另一种以S3和S8为代表,种群在越冬期生长力减弱,无有性繁殖资源分配,未能有效应对不利环境条件,最终导致两站位种群在次年急剧退化甚至种群消失。本研究结果珠江河网密刺苦草种群衰退特征及其影响机制,可为珠江河网水草床种群复建,珠江河网水生态功能和渔业资源持续利用和发展提供基础依据。
英文摘要:
      Submerged macrophyte beds (SMBs) play important roles in aquatic ecosystem, but the succession characteristics of SMBs in urban river systems are still poorly understood. Insufficient knowledge about SMBs succession from a large-scale perspective narrows the necessary decisionmaking for local riverine conservation. Vallisneria denseserrulata is a dominant species in the SMBs of the Pearl River Network (PRN), but faces sharp decline risks. In order to explore the decline characteristics and main influencing factors of the existing population of V. denseserrulata in 2018 at S3, S5 and S8 river sections from the PRN, the plant height, plant weight, leaf indexes and rhizome indexes of V. denseserrulata and the environmental factors were analyzed by using multivariate statistical methods including redundancy analysis (RDA) and principal component analysis (PCA). The results showed obvious temporal-spatial distribution characteristics of morphologic traits of the V. denseserrulata population in 2018. The plant height and plant weight of V. denseserrulata population at S3 and S8 sections increased from February to August, but decreased from August to December, while the above indexes of V. denseserrulata at S5 section kept growing. In December, growth characteristics of V. denseserrulata differentiated among sections, with population at section S5 entering the flower and fruit stage, while population at sections S3 and S8 recession at this stage. RDA results showed that the plant height was mainly affected by water depth, medium particle size components in sediments and total phosphorus content in sediments, while the plant weight was mainly affected by total phosphorus content in sediments. The results of PCA showed that 9 morphological traits could comprehensively characterized by clonal growth ability, sexual reproduction ability and multi-year growth ability, and determine the population maintenance strategies. One is represented by S5 population, which maintains sustainable growth during the overwintering period and adopting sexual reproduction resources allocation, adapting to certain environmental changes and population being maintained and success in the next year. The other is represented by S3 and S8 populations. During the overwintering period, the growth capacity of the populations was weakened, accompanied with no allocation of sexual reproduction resources, being failed to effectively deal with adverse environmental conditions, and eventually facing populations rapid degradation and disappearance at the two above sites in the next year. This study firstly explored the decline characteristics and impact mechanism of V. denseserrulata population in the PRN based on multivariate statistical analysis method of morphological traits, which provided basic information for the reconstruction of SMBs in the PRN, to maintain local aquatic ecological functions and the sustainable utilization and development of fishery resources.
李毅,杨婉玲,王超,赖子尼,李海燕,刘乾甫,高原,麦永湛,曾艳艺.2024.珠江河网密齿苦草种群衰退的表观性状特征指示[J].水生态学杂志,45(4):155-164.
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