β diversity and its components of the fish community in the Haizhou Bay during autumn and the relationships with environmental factors
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摘要: 由于过度捕捞等人类活动的胁迫,近年来海州湾渔业资源严重衰退。为了解海州湾鱼类β多样性的变化特征及其影响因素,本研究根据2013−2017年秋季在海州湾及其邻近海域进行的渔业资源底拖网调查数据,采用Sørenson相异性指数等方法计算了调查站位间以及海州湾海域整体的鱼类β多样性,并将β多样性分解为周转和嵌套两个组分,分析其时空变化特征。结合海州湾环境数据,采用广义非相似性模型分析海州湾鱼类β多样性及其组分与环境因子的关系。结果表明,海州湾鱼类β多样性及其周转和嵌套组分在年际间呈现不同程度的波动态势,浅水区的波动较为明显,深水区其次,海州湾整体则维持在较为稳定的状态;鱼类群落组成以周转模式变化。海水盐度和叶绿素a浓度是影响β多样性及其周转的主要因素,两者累计的模型偏差解释率分别为28.05%和23.33%,温度的影响相对较小;广义非相似性模型对嵌套组分的解释率较低。本研究深入解析了海州湾鱼类β多样性的时空特征及其影响因素,旨在为建立海洋保护区、优化海洋保护策略提供科学依据。Abstract: This study aims to understand the characteristics and variability in the β diversity of fish community and its influencing environmental factors in the Haizhou Bay, which was rich in fishery resources in history but seriously declined in recent years due to overfishing and environmental pollution. The data were collected from fishery resource surveys conducted in the Haizhou Bay and its adjacent waters from 2013 to 2017 using bottom trawl in autumn. β diversity was measured by Sørensen dissimilarity index using pairwise and multiple-site methods. Additionally, β diversity was divided into turnover and nestedness components and the results were analyzed visually by violin plots. On this basis, the generalized dissimilarity modelling (GDM) was used to analyze the relationship between β diversity and its components with environmental factors. The results of this study showed that the β diversity of fish community and its components fluctuated remarkably among survey years, the fluctuation was larger in the shallow water, less for the deep water, and remained at a relatively stable level regarding the whole sea area. The proportion of the turnover component in β diversity was basically maintained at more than 80%. The component of turnover was significantly larger than that of nestedness, implying the changes of fish community in the Haizhou Bay were dominated by turnover. The salinity and chlorophyll concentration of seawater were the main factors influencing β diversity and its turnover component, and the accumulated deviance explained rate of salinity and chlorophyll were 28.05% and 23.33%, respectively, the influence of water temperature was weak. The environmental factors selected in this study had a low explanatory rate for the nestedness component, which was only 1.52%. Our results implied that the characteristics of fish community have been driven by the environment, and the community development can yield corresponding adaptive to environmental changes. The process of changes in β diversity of fish community may be complex. For instance, salinity and chlorophyll concentration affect the prey density of fish and thus affect β diversity, however, more influencing factors have not been evaluated. Further studies on β diversity and its components are necessary to understand the mechanism of changing characteristics of fish community, and to provide scientific reference for the establishment of marine reserves as well as the optimization of marine conservation strategies.
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Key words:
- fish community /
- β diversity /
- environmental factor /
- generalized dissimilarity modelling /
- Haizhou Bay
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表 1 海州湾及其邻近海域环境因子监测结果
Tab. 1 Monitoring results of environmental factors in the Haizhou Bay and its adjacent waters
环境因子 平均值 最大值 最小值 变异系数CV 叶绿素 a浓度/(mg·m−3) 2.28 4.28 0.66 0.44 水深/m 20.71 29.08 11.19 0.22 水温/℃ 20.93 25.02 18.47 0.09 盐度 29.80 31.94 21.71 0.05 表 2 环境因子的Pearson相关系数
Tab. 2 Pearson correlation coefficients between environmental factors
环境因子 盐度 水温 水深 水温 0.029 水深 0.371** 0.149 叶绿素 a浓度 −0.598** −0.140 −0.640** 注:**代表p<0.01。 表 3 β多样性指数及其计算公式
Tab. 3 Calculation formulas of β diversity indices
β多样性指数 公式 站位间Sørenson相异性指数 $ {\ \text{β} }_{{\rm{sor}}}=\dfrac{b+c}{2a+b+c} $ 站位间Sørenson指数中周转组分 $ {\ \text{β} }_{{\rm{sim}}}=\dfrac{\mathrm{m}\mathrm{i}\mathrm{n}(b,c)}{a+\mathrm{m}\mathrm{i}\mathrm{n}(b,c)} $ 站位间Sørenson指数中嵌套组分 $ {\ \text{β} }_{{\rm{nes}}}={\text{β} }_{{\rm{sor}}}-{\text{β} }_{{\rm{sim}}} $ 海域Sørenson相异性指数 $ {\ \text{β} }_{{\rm{SOR}}}=\dfrac{\left[\displaystyle\sum _{i < j}\mathrm{m}\mathrm{i}\mathrm{n}({b}_{ij},{b}_{ji})\right]+\left[\displaystyle\sum _{i < j}\mathrm{m}\mathrm{a}\mathrm{x}({b}_{ij},{b}_{ji})\right]}{2\left[\displaystyle\sum _{i}{S}_{i}-{S}_{{\rm{T}}}\right]+\left[\displaystyle\sum _{i < j}\mathrm{m}\mathrm{i}\mathrm{n}({b}_{ij},{b}_{ji})\right]+\left[\displaystyle\sum _{i < j}\mathrm{m}\mathrm{a}\mathrm{x}({b}_{ij},{b}_{ji})\right]} $ 海域Sørenson指数中周转组分 $ {\ \text{β} }_{{\rm{SIM}}}=\dfrac{\left[\displaystyle\sum _{i < j}\mathrm{m}\mathrm{i}\mathrm{n}({b}_{ij},{b}_{ji})\right]}{\left[\displaystyle\sum _{i}{S}_{i}-{S}_{{\rm{T}}}\right]+\left[\displaystyle\sum _{i < j}\mathrm{m}\mathrm{i}\mathrm{n}({b}_{ij},{b}_{ji})\right]} $ 海域Sørenson指数中嵌套组分 $ {{\ \text{β} }_{{\rm{NES}}}=\text{β} }_{{\rm{SIM}}}-{\text{β} }_{{\rm{SOR}}} $ 注:βsor、βsim、βnet分别为站位间的β多样性、周转组分和嵌套组分;a为两个站位共有的物种数;b和c分别为两个站位所特有的物种数;Si为站位i的物种数;ST为所有调查站位的物种总数;bij和bji分别为站位i和j所特有的物种数。 表 4 预测变量筛选结果
Tab. 4 Screening results of predictors
模型 因子 累计偏差解释率/% 贡献率/% Model-βsor 地理距离 9.60 9.60 叶绿素a浓度 29.14 19.54 水深 29.14 0.00 水温 30.01 0.86 盐度 38.52 8.51 Model-βsim 地理距离 9.49 9.49 叶绿素a浓度 27.32 17.83 水深 27.32 0.00 水温 27.51 0.19 盐度 33.01 5.50 Model-βnes 地理距离 − − 叶绿素a含量 − − 水深 − − 水温 0.80 0.80 盐度 1.52 0.73 注:地理距离由GDM计算得出,即欧氏距离;“−”表示该变量对模型拟合无效。 -
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