Food resources of shredders and other benthic macroinvertebrates in relation to shading conditions in tropical Hong Kong streams
Food resources of shredders and other benthic macroinvertebrates in relation to shading conditions in tropical Hong Kong streams
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DOI：
10.1111/j.1365-2427.2008.02022.x
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发表时间：
2008-10
影响因子：
2.7
通讯作者：
Aggie O. Y. Li;D. Dudgeon
中科院分区：
文献类型：
--
作者：
Aggie O. Y. Li;D. Dudgeon
摘要 1. 利用大型底栖无脊椎动物的肠道内容物分析（GCA），并辅以碳和氮稳定同位素分析（SIA），确定了香港热带地区 5 条遮荫溪流和 5 条未遮荫溪流中落叶层和本地食物来源对消费者生物量的相对贡献。 2. 在解剖的 58 个形态种中，仅鉴定出 4 个专性粉碎机和 2 个兼性粉碎机。尽管溪流中含有丰富的粗颗粒有机物（CPOM），但非粉碎类群消耗的粗颗粒有机物（CPOM）很少（<23%），GCA显示细颗粒有机物是大多数初级消费者的主要食物（25-99%）。 3.稳定同位素分析结果与GCA的结果基本一致，并证实四个专职粉碎机中的三个对CPOM具有高度依赖性（同化碳的55-78％）。 4. 原生能源在所有溪流中都很重要：所检查的非破碎初级消费者占阴影溪流中大型无脊椎动物总丰度的 72%，（平均）61% 的生物量来自原生食物；无阴影溪流的等效值为 72%（丰度）和 71%（生物量）。
Summary 1. Gut content analyses (GCA) of benthic macroinvertebrates, supplemented by carbon and nitrogen stable isotope analyses (SIA), were used to determine the relative contribution of leaf litter and autochthonous food sources to consumer biomass in five shaded and five unshaded streams in tropical Hong Kong. 2. Only four obligate shredders and two facultative shredders were identified out of 58 morphospecies dissected. Non-shredder taxa consumed little (<23% food eaten) coarse particulate organic matter (CPOM) in spite of its abundance in streams, and GCA revealed that fine particulate organic matter was the major food (25–99%) of most primary consumers. 3. Stable isotope analysis results were in general agreement with the findings of GCA, and confirmed that three of the four obligate shredders had a high dependence (55–78% of assimilated carbon) on CPOM. 4. Autochthonous energy sources were important in all streams: non-shredding primary consumers examined, which accounted for 72% of total macroinvertebrate abundance in shaded streams, derived (on average) 61% of their biomass from autochthonous foods; the equivalent values for unshaded streams were 72% (abundance) and 71% (biomass).