Use of saguaro fruit by white-winged doves: isotopic evidence of a tight ecological association
Use of saguaro fruit by white-winged doves: isotopic evidence of a tight ecological association
复制标题
白翅鸽子对仙人掌果实的利用：紧密生态关联的同位素证据
作者：
Blair O. Wolf;C. M. D. Rio
摘要利用稳定同位素和作物含量分析，定量分析了沙漠白翅鸽（Zenaida asiatica mearsnii）对仙人掌花蜜和果实的利用。与其他鸽食植物（δ13CC3= -24.9±3.3‰SD VPDB）相比，石斛资源具有明显的13c富集特征（花蜜和果实δ13C分别为-12.8±0.7‰和-13.1±0.5‰SD VPDB）。与其他水源（-41 ~ -19‰）相比，石榴花蜜和果实中的水氘含量较高（δD分别为19.6±2.0‰SD VSMOW和48.4±1.6‰SD VSMOW）。在果期，鸽子肝脏组织δ13C与果实中柚的含量呈显著正相关。两点混合模型表明，在对仙人掌果的利用高峰期，鸽子组织中吸收的大部分碳来自于仙人掌。沙漠白翅鸽似乎是壁虎的专家。在鸽子居住期间的平均水平上，仙人掌约占鸽子组织中总碳含量的60%。体内水分的δ13C和δD呈显著正相关，说明白鸽以食水石为营养来源。但在利用高峰期，白鸽的体水δD大于果水δD（约为20‰）。我们假设这种富集是由于鸽子的分馏蒸发水分损失造成的。利用鸽子的碳同位素数据和双终点混合模型，我们估计鸽子平均每个季节消耗相当于128个瓜罗果；每个果实平均含有26.0±14.8 g SD果肉（湿质量），其中19.4 g为水。稳定同位素已被用于动物饮食的定性重建。我们的研究表明，它们也可以用来提供营养物质从资源流向消费者的定量估计。
Abstract We report the use of stable isotope and crop content analyses to quantify the use of saguaro (Carnegiea gigantea) nectar and fruit by migratory desert white-winged doves (Zenaida asiatica mearsnii). Saguaro resources had characteristically 13C-enriched CAM values (δ13C=–12.8±0.7‰ SD VPDB and –13.1±0.5‰ SD VPDB for nectar and fruit, respectively) relative to other food plants used by doves (δ13CC3=–24.9±3.3‰ SD VPDB). The water contained in saguaro nectar and fruit was deuterium enriched (δD=19.6±2.0‰ SD VSMOW and 48.4±1.6‰ SD VSMOW for nectar and fruit, respectively) relative to other water sources (ranging from –41 to –19‰ VSMOW). During the fruiting season, there was a positive correlation between δ13C in dove liver tissues and percent of saguaro in crop contents. A two-point mixing model indicated that during the peak of saguaro fruit use, most of the carbon incorporated in dove tissues was from saguaro. Desert white-winged doves appear to be saguaro specialists. Averaged over the period when doves were resident, saguaro comprised about 60% of the total carbon incorporated into dove tissues. Tissue δ13C and δD of body water showed a significant positive correlation, indicating that doves were using saguaro as a source of both nutrients and water. However, at the peak of saguaro utilization, the doves’ body-water δD was more positive (by about 20‰) than saguaro fruit water. We hypothesize that this enrichment is due to fractionated evaporative water losses by doves. Using dove carbon isotope data and a two end-point mixing model we estimate that, on average, doves consume the equivalent of 128 saguaro fruits per season; each fruit contains on average 26.0±14.8 g SD of pulp (wet mass) of which 19.4 g is water. Stable isotopes have been used to produce qualitative re-constructions of animal diets. Our study shows that they can be used to provide quantitative estimates of the flow of nutrients from resources into consumers as well.
DOI：
10.1152/ajpregu.1986.251.6.r1137
发表时间：
1986
期刊：
The American journal of physiology
影响因子：
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作者：
Schoeller,DA;Leitch,CA;Brown,C
通讯作者：
Brown,C