枸杞岛不同生境大型藻类与藻床无脊椎动物功能群的关联性分析

CORRELATION ANALYSIS OF FUNCTIONAL GROUPS OF MACROALGAE AND SEAWEED BED INVERTEBRATES IN DIFFERENT HABITATS IN GOUQI ISLAND

大型藻类是饵料和栖息地的主要供给者之一,枸杞岛大规模的贻贝养殖筏架和岛礁岸线为藻类生长提供了丰富的基质,但对该区域丰富的藻类资源与藻床无脊椎动物功能群的关联性知之甚少,由此也限制了对大型藻类生态系统服务功能的深入理解。于2021年8月至2022年4月在枸杞岛贻贝养殖区布设12个水体站位、3个潮间带站位,开展了4个季度大型藻类及藻床无脊椎动物的采样调查。利用大型藻类与藻床无脊椎动物功能群的生物量,采用线性混合效应模型(linear mixed-effects models,LMMs)、广义加性模型(generalized additive models,GAMs)进行拟合,并用glmm.hp包解析了藻类各功能群对藻床无脊椎动物群落影响的贡献率。结果表明,贻贝养殖区的冠层藻类对植食者的影响虽呈极显著线性关系,但每增加100 g冠层藻类,仅能增加1.76 g植食者,二者间的能量转换小于自然界十分之一能量转换定律;潮间带的冠层藻类与碎屑食者和浮游植食者均具有非线性的显著相关性。分析认为,枸杞岛海域大型藻类以食物供给方式增加物种聚集的作用有限,其栖息地供给作用可能更为明显。对于碎屑食者和杂食者,红藻类尤其是钙质藻类是其更好的栖息地供给者。研究基于多模型量化分析了枸杞岛不同生境大型藻类对藻床无脊椎动物的影响,为优化藻类资源管理和制定相应的保护策略提供了新视点。

Macroalgae are among the leading suppliers of bait and habitat.However,the interplay between macroalgae and seaweed bed invertebrates remains poorly understood,which has limited the in-depth understanding of macroalgae ecosystem service functions.In this study,12 water stations and three intertidal stations were deployed in the mussel culture area of Gouqi Island,Zhoushan Archipelago,Zhejiang,in East China Sea,from August 2021 to April 2022,and the survey of macroalgae and seaweed bed invertebrates was carried out over four quarters.The impact of macroalgae on seaweed bed invertebrates in different habitats on Gouqi Island was quantitatively analyzed based on the linear mixedeffort models(LMMs)and generalized additive models(GAMs),the biomasses of functional groups of macroalgae and seaweed bed invertebrates were fitted.The contribution rate of each algae functional group to the seaweed bed invertebrate community was analyzed using the glmm.hp package.Results show that although the influence of canopy algae on the phytophagous group in the mussel farming area showed a very significant linear relationship,every increase of 100 g of canopy algae could increase only 1.76 g of the phytophagous group,and the energy conversion between the two was less than the law of one-tenth of energy conversion in nature.Significant nonlinear correlations were observed between intertidal canopy algae detritivores and phytoplankton eaters.The role of macroalgae in recruiting species to use food supplies was limited,while the role of macroalgae in habitat supply was more prominent.Red algae,mainly coralline algae,were shown to be better habitat providers for the detritivorous and omnivorous groups.This study provided a new perspective for optimizing macroalgal resource management and formulating corresponding conservation strategies.