环境饵料丰度的季节变化对筼筜湖3种大型底栖动物食性的影响——来自稳定同位素的证据

郑新庆; 黄凌风; 林荣澄

doi:10.3969/j.issn.0253-4193.2014.12.003

环境饵料丰度的季节变化对筼筜湖3种大型底栖动物食性的影响——来自稳定同位素的证据

doi: 10.3969/j.issn.0253-4193.2014.12.003

1.
国家海洋局第三海洋研究所, 福建厦门 361005
2.
厦门大学环境与生态学院, 福建厦门 361005

基金项目: 福建省自然科学基金(2014J01127);国家海洋公益性行业科研经费资助项目(201105012,201205009-3)。

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出版历程
- 收稿日期: 2014-04-18
- 修回日期: 2014-06-02

Seasonal shifts in food sources influence feeding habits of three macrozoobenthos species in the Yundang Lagoon: the evidence from stable isotope

1.
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
2.
College of the Environment and Ecology, Xiamen University, Xiamen 361005, China

摘要

摘要: 测定了不同时期筼筜湖3种大型底栖动物(沙筛贝Mytilopsis sallei、日本大螯蜚Grandidierella japonica和腺带刺沙蚕Neanthes japonica)及其潜在食源的稳定同位素组成(δ¹³C和δ¹⁵N),研究环境饵料丰度的季节变化对筼筜湖3种大型底栖动物食性的影响。结果显示,筼筜湖悬浮颗粒有机物(Particulate organic matter:POM)的δ¹³C和δ¹⁵N存在明显的季节变化。3月,受到输入筼筜湖的西海域海水大量陆源有机碎屑以及湖区周围的生活污水以及餐饮业输入的影响,筼筜湖POM的δ¹³C和δ¹⁵N明显贫化;而在9月,POM中δ¹³C和δ¹⁵N明显富集的内源性浮游植物的贡献增加。沙筛贝是典型的底栖滤食者,主要以POM为食,但它比POM富集的δ¹³C值(3月和9月二者之间的Δδ¹³C分别为2.9‰和1.6‰)表明它还摄入其他δ¹³C相对富集的食物来源:石莼来源的有机碎屑可能是3月份沙筛贝δ¹³C富集的原因,而9月份则是由于再悬浮的底栖微藻对沙筛贝食源的贡献引起的。食碎屑的腺带刺沙蚕和日本大螯蜚在3月以石莼及其表面的附生生物为食,而9月份底栖微藻和浮游植物来源的POM是它们食源的主要贡献者。本研究的结果显示,筼筜湖3种大型底栖动物的δ¹⁵N都出现明显的季节变化(Δδ¹⁵N介于2.2‰~4.3‰),这是由于它们食源稳定同位素的季节性波动及其食性的季节变化引起的,而消费者食性的季节性变化则受到不同时期环境食物可利用性的影响。
- 大型底栖动物 /
- 季节变化 /
- 食性 /
- 稳定同位素 /
- 筼筜湖
Abstract: Carbon and nitrogen stable isotope (δ¹³C and δ¹⁵N,respectively) analysis were made on three species of lagoon macrozoobenthos (suspension feeder Mytilopsis sallei,and deposit feeders Grandidierella japonica and Neanthes japonica) and their food sources in March and September in order to examine the influence of seasonal shifts in food sources to their feeding habits. The results showed that there is a significant difference in δ¹³C and δ¹⁵N of POM observed. Due to the large input of terrestrial debris and the sewage water discharged by the catering industry around the lagoon,lagoon POM in March was characterized by depleted-δ¹³C and δ¹⁵N. However,the contribution of phytoplankton increased in September as temperature increased. M. sallei was a typical benthic filter-feeder as suggested by the δ¹³C values closest to POM. However,it displayed a little more enriched in δ¹³C than POM,indicating that it may assimilate other δ¹³C-enriched organic matters,perhaps the debris from Ulva lactuca in March and benthic microalgae in September. Deposit feeder G. japonica and N. japonica mainly fed on U. lactuca and its associated epiphytes in March while obtained the carbon sources from benthic microalgae and phytoplankton in September. Our results indicated the significantly seasonal variations in δ¹⁵N for three macrozoobenthos species with the Δδ¹⁵N between 2.2‰ and 4.3‰,which may be caused by seasonal shifts of the stable isotope of food sources and their feeding habits. The differences of feeding habits for these macrozoobenthos were strongly affected by food availabilities in the lagoon.
- Macrozoobenthos /
- seasonal shifts /
- feeding habits /
- stable isotope /
- Yundang Lagoon

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