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

被引：15

作者：

郑新庆 ^{[1
]}

黄凌风 ^{[2
]}

林荣澄 ^{[1
]}

机构：

[1] 国家海洋局第三海洋研究所

[2] 厦门大学环境与生态学院

来源：

海洋学报 | 2014年 / 36卷 / 12期

关键词：

大型底栖动物; 季节变化; 食性; 稳定同位素; 筼筜湖;

D O I：

暂无

中图分类号：

Q958.8 [水生动物学];

学科分类号：

071302 [动物生态学];

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δ15 N）,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δ15 N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δ13 C和δ15 N明显贫化;而在9月,POM中δ13 C和δ15 N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δ13 C值（3月和9月二者之间的Δδ13 C分别为2.9‰和1.6‰）表明它还摄入其他δ13 C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δ15 N都出现明显的季节变化（Δδ15 N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。

引用

页码：32 / 40

页数：9

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