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引用本文:吕超超,王家安,马徐发,夏成星.基质类型对耳萝卜螺(Radix auricularia)-苦草(Vallisneria spiralis)牧食关系的影响.湖泊科学,2019,31(2):458-468. DOI:10.18307/2019.0215
LV Chaochao,WANG Jiaan,MA Xufa,XIA Chengxing.Influence of sediment types on Vallisneria spiralis, Radix auricularia and their relationships with herbivory. J. Lake Sci.2019,31(2):458-468. DOI:10.18307/2019.0215
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基质类型对耳萝卜螺(Radix auricularia)-苦草(Vallisneria spiralis)牧食关系的影响
吕超超1,2,3, 王家安1,2,3, 马徐发1,2,3, 夏成星1,2,3
1.华中农业大学水产学院, 武汉 430070;2.淡水水产健康养殖湖北省协同创新中心, 武汉 430070;3.池塘健康养殖湖北省工程实验室, 武汉 430070
摘要:
沉水植物和螺类都是水生生态系统的重要组成部分,两者的牧食关系也是水生食物网中重要的一环,而不同的基质类型可能会影响两者的生长和改变沉水植物对螺类牧食的防御策略.以耳萝卜螺(Radix auricularia)和苦草(Vallisneria spiralis)为对象,研究基质类型、螺类牧食对沉水植物的生长及防御策略的影响,以及基质类型及沉水植物对螺类生长和生理特征的影响.研究发现,螺类牧食和基质类型对苦草生长和元素特征具有显著的影响,存在螺类牧食时,泥沙基质和沙基质苦草的相对生长速率显著降低,泥沙、沙和泥基质苦草地上生物量分别减少了67.74%、58.58%和17.84%,根冠比分别升高了177.51%、217.23%和1.44%;且泥沙基质中苦草的叶片数显著低于无牧食组.不同基质类型下,牧食对苦草总碳含量无显著影响,但泥和泥沙组中,螺类牧食使苦草的总氮含量均显著降低,碳氮比均显著升高;沙基质下,螺类牧食使苦草总酚含量显著降低.基质类型对螺类的形态特征(除壳宽外)、生长及元素含量均无显著影响.总体来看,基质类型对耳萝卜螺牧食和苦草防御策略具有一定程度的影响,但对螺类的生长及元素特征基本无影响.本研究可以为牧食理论的研究提供基础数据支持,也可为沉水植被恢复、水生生态系统稳定提供参考,但基质类型对螺草牧食关系的长期影响,仍需进一步深入研究.
关键词:  苦草  耳萝卜螺  基质类型  牧食  元素  总酚
DOI:10.18307/2019.0215
分类号:
基金项目:国家自然科学基金项目(31500293)和中央高校基本科研业务费专项(2662015BQ038)联合资助.
Influence of sediment types on Vallisneria spiralis, Radix auricularia and their relationships with herbivory
LV Chaochao1,2,3, WANG Jiaan1,2,3, MA Xufa1,2,3, XIA Chengxing1,2,3
1.Fisheries College, Huazhong Agricultural University, Wuhan 430070, P. R. China;2.Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan 430070, P. R. China;3.Hubei Provincial Engineering Laboratory for Pond Aquaculture, Wuhan 430070, P. R. China
Abstract:
Submerged plants and snails both are important components of aquatic ecosystems. Their relationships with herbivory also play an important role on the aquatic food web, and different sediment types may affect the growth of them and change the defensive strategy of submerged plant against snail herbivory. By taking Vallisneria spiralis and Radix auricularia as the research object in this research, we studied the effects of sediment types, snail herbivory on the growth submerged plants and the defensive strategies change, and also studied the effects of sediment types on snail growth and physiological characteristics. Our results showed that snail herbivory and sediment types have a significant impact on the growth and elemental characteristics of V. spiralis. In the presence of snail herbivory, the relative growth rate of V. spiralis in mixture and sand sediment both were significantly reduced. The shoot biomass of V. spiralis in mixture, sand and mud sediment were decreased by 67.74%, 58.58% and 17.84%, respectively, and the root:shoot biomass ratio increased by 177.51%, 217.23% and 1.44%, respectively. The leaves number of V. spiralis in mixture was significantly reduced with snail herbivory. Under different sediment types, the herbivory had no significant effect on the total carbon content of V. spiralis. However, the snail herbivory significantly reduced the total nitrogen content of V. spiralis, and C/N increased significantly in mud and mixture sediment. The total phenols content of V. spiralis was significantly reduced in sand sediment. The sediment types had no significant effect on the morphological characteristics (except for shell width), growth and element content of R. auricularia. In conclusion, the sediment types influenced on the snail herbivory and the defense strategy of V. spiralis in some extent, but had no effect on the growth and elemental characteristics of R. auricularia. This study can provide basic data support for the research of herbivory theory, and also provide reference for submerged vegetation restoration and aquatic ecosystem stability. However, the long-term effects of sediment types on submerged plants, snails, and their relationships with herbivory need to be further studied.
Key words:  Vallisneria spiralis  Radix auricularia  sediment types  herbivory  element  total phenols
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