INSECT FOOD PREFERENCES ANALYZED USING C-13-C-12 RATIOS
INSECT FOOD PREFERENCES ANALYZED USING C-13-C-12 RATIOS
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DOI：
10.1007/bf00346561
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发表时间：
1979-01-01
期刊：
影响因子：
2.7
通讯作者：
HAINES, E
中科院分区：
文献类型：
--
作者：
PETELLE, M;HAINES, B;HAINES, E
稳定碳同位素比值分析是示踪生态系统碳流动的有力手段，尤其是初级和次生生产者之间的碳流动。植物物种独特的13C/12C比率倾向于沿着食物链传递，几乎没有进一步的分馏；动物稳定的碳同位素组成是了解它吃了什么的重要线索。在美国佐治亚州的一块老田里，对植物和昆虫的稳定碳同位素组成进行了比较。在老田优势植物中，有6种为C4种，其~(13)C值为-10.9个/株。到12.9，珀米尔。7种为C3种，平均为-27.3个/m。降至-29.1per Mill..已知的仅以一种植物为食的昆虫的差值在1‰以内。植物的同位素组成。寄生于2种昆虫的黄蜂幼虫的13C值分别为1.3和1.7。比食品厂的高。在老田单一种和混交种植物林中采集的各种食性未知的昆虫的~(13)C值在-10.1/m之间。降至-30。每磨..两种叶蝉和一种蝗虫的同位素组成在C4植物值范围内。一种龟甲和一种蕾丝甲虫的同位素组成在C3植物值范围内。其他昆虫的13C值居中，这表明它们的食物是由C3和C4植物组成的。野外采集的昆虫的碳同位素比值可能是它们取食偏好的一个有用的定性指标。
Stable C isotope ratio analysis is a powerful technique in tracing ecosystem C flows, especially those between primary and secondary producers. The distinctive 13C/12C ratios of plant species tend to pass along the food chain with little further fractionation; the stable C isotope composition of an animal is an important clue to what it has eaten. The stable C isotope composition of plants and insects was compared in an old field in Georgia [USA]. Of the dominant plants in the old field, 6 were C4 species and had .delta.13C values of -10.9.permill. to 12.9.permill. and 7 were C3 species with values of -27.3.permill. to -29.1.permill.. Insects known to feed on only 1 plant species had .delta.13C values within 1.permill. of the isotopic composition of the plant. Wasp larvae parasitizing 2 insect species had .delta.13C values 1.3 and 1.7.permill. higher than that of the food plant. A variety of insects of unknown food habits collected on monospecific and mixed species plant stands in the old field had .delta.13C values ranging from -10.1.permill. to -30.0.permill.. Two species of leafhopper and a grasshopper had isotopic compositions within the range of C4 plant value. A tortoise beetle and a lace bug had isotopic compositions within C3 plant values. Other insects had intermediate .delta.13C values, suggesting a mixed diet composed of C3 and C4 plants. The C isotopic ratios of field collected insects may be a useful qualitative indicator of their feeding preference.