不同初始螺类密度对沉水植物刺苦草<i>Vallisneria spinulosa</i> Yan及其附着藻类的影响

王秋林; 支永威; 江红生; 操瑜; 李伟

doi:10.11913/PSJ.2095-0837.2017.50741

不同初始螺类密度对沉水植物刺苦草Vallisneria spinulosa Yan及其附着藻类的影响

王秋林¹,
支永威^2,3,5,
江红生^2,3,
操瑜^2,3, ,,
李伟⁴

1. 江西省科学院, 南昌 330096;
2. 中国科学院水生植物与流域生态重点实验室, 武汉 430074;
3. 中国科学院武汉植物园水生植物生物学实验室, 武汉 430074;
4. 中国科学院武汉植物园湿地演化与生态恢复湖北省重点实验室, 武汉 430074;
5. 中国科学院大学, 北京 100049

基金项目:

江西省科学院博士引进项目（2014-YYB-25）；国家自然科学基金项目（31500296）。

详细信息

作者简介:
王秋林(1980-),男,博士,从事湿地生态学研究(E-mail:qlwangjxas@163.com)。

通讯作者:
操瑜,caoyu@wbgcas.cn

中图分类号: Q945
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出版历程
- 收稿日期: 2017-04-09
- 网络出版日期: 2022-10-31
- 发布日期: 2017-10-27

Effects of different initial snail densities on submersed macrophyte Vallisneria spinulosa Yan and its epiphyton

1. Jiangxi Academy of Sciences, Nanchang 330096, China;
2. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China;
3. Laboratory of Aquatic Plant Biology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China;
4. Hubei Key Laboratory of Wetland Evolution & Ecological Restoration, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074;
5. University of Chinese Academy of Sciences, Beijing 100049, China

Funds:

This work was supported by grants from the Ph. D. Introduction Project of Jiangxi Academy of Sciences (2014-YYB-25) and the National Natural Science Foundation of China (31500296).

摘要

摘要: 大型水生植物及其附着藻类是浅水湖泊中的重要初级生产者。淡水螺类作为重要的初级消费者，其密度对沉水植物及其附着藻类的影响存在争议。本研究设置4种初始螺类密度（0、40、80、240 ind·m^-2），研究淡水螺类（椭圆萝卜螺Radix swinhoei H.Adams）对刺苦草（Vallisneria spinulosa Yan）及其附着藻类的直接牧食作用和螺类种群的变化。结果显示，在添加螺处理中，刺苦草和人工基质表面附着藻类的生物量显著降低，同时沉水植物的生长显著增加，在较高初始密度螺类处理中刺苦草产生更多的分株。到实验结束时，螺类的死亡率较高，但3个有螺处理间螺类鲜重无显著差异，而高初始密度螺类条件下的最终密度仍较高，同时个体重量（均重）也较小。在中富营养条件下淡水螺类可以直接牧食沉水植物叶片，但对植物生长的抑制作用不显著，有可能是因为沉水植物并不能作为唯一的食物来源维持螺类种群，同时螺类的种群结构受到水体营养水平等因素的制约。
- 沉水植物 /
- 淡水螺类 /
- 密度 /
- 刺苦草 /
- 附着藻类 /
- 周丛藻类
Abstract: Macrophytes and their epiphyton are the main primary producers in shallow lakes. Freshwater snails are the main primary consumers in freshwater ecosystems, but it is still debatable whether snail densities are an important factor that determine the growth of macrophytes and their epiphyton. We established four snail densities (0, 40, 80, and 240 ind·m^-2) to investigate the grazing impact of snails (Radix swinhoei H. Adams) on the submerged macrophyte Vallisneria spinulosa Yan and its epiphyton, and determine the dynamics of the snail populations from the interaction. Results indicated that R. swinhoei strongly reduced the biomass of the epiphyton, but promoted the biomass of the macrophytes, and at the highest initial snail density even induced higher ramet number of macrophytes. The direct grazing effects of snails on macrophytes were observed but were not significant at the moderate eutrophic level, probably because submerged macrophytes alone could not support the high densities of snails. The size structure of the snail population could quickly respond to nutrient levels of the water-bodies and food resources in the environment.
- Actinidia /
- Interspecific cross /
- Sex ratio /
- Flower color /
- Flowering trait /
- Variation

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