• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>other >Effect of Brood Age on Nestling Diet and Prey Composition in a Hedgerow Specialist Bird the Barred Warbler Sylvia nisoria
【2h】

Effect of Brood Age on Nestling Diet and Prey Composition in a Hedgerow Specialist Bird the Barred Warbler Sylvia nisoria

机译：育雏年龄对绿篱专家鸟（Sbarvia nisoria）的绿篱专家鸟的雏鸟饮食和猎物组成的影响

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The composition and quality of food provided to nestling birds influence their growth and development and offers key insight into the ecological requirements of birds. One bird species whose feeding ecology is poorly understood is the Barred Warbler (Sylvia nisoria), which utilizes semi-natural shrubby vegetation in agroecosystems. Because Barred Warbler nestlings vary greatly in body mass we hypothesised that diet and prey properties (size, diversity, taxonomic composition, and chitin content and resulting body hardness and digestibility) would differ as the nestlings aged. We quantified the diet based on faecal analysis, sampling faecal sacs from the nestlings pooled into three age classes: 2-3 days old, 4-6 d old, and 7-9 d old. Nestlings were provided a wide diversity of food and a strong relationship existed between food characteristics and nestling age. The youngest nestlings (2-3 d old) had the lowest values of each dietary characteristic (diversity, number and total biomass of prey, and individual prey weight), that were significantly lower than the oldest nestlings (7-9 d old). Nestlings aged 4-6 d exhibited intermediate dietary characteristics. Differences in dietary composition of the six major food types showed marked differences between the individual broods and age categories. Percentages of the number and biomass of soft-bodied prey were highest in the diet of 2-3 d and 4-6 d old nestlings, and decreased with increasing age, whereas the opposite trend was observed in the percentage of intermediately and heavily chitinised prey. Parent Barred Warblers probably preferentially select soft-bodied prey for the youngest nestlings, and satisfy the greater energy demands of the older ones by providing them with a greater variety of prey containing more chitin, as well as plant food. The provisioning of less-readily digestible prey to older nestlings suggests that as the quality of food decreases the quantity increases, implying that the youngest nestlings may be physiologically limited as regards their ability to digest more heavily chitinised prey.
机译：提供给雏鸟的食物的成分和质量会影响它们的生长和发育，并为洞察鸟类的生态需求提供重要见识。饲喂生态系统的一种鸟类知之甚少的是条纹莺（Sylvia nisoria），它在农业生态系统中利用了半天然的灌木植物。由于Barbared Warbler雏鸟的体重差异很大，因此我们推测，随着雏鸟年龄的增长，其饮食和猎物特性（大小，多样性，分类学组成和几丁质含量以及由此产生的身体硬度和消化率）也会有所不同。我们根据粪便分析对饮食进行定量，从三个年龄段的雏鸟中取样粪便囊：2-3天大，4-6天大和7-9天大。雏鸟的食物种类繁多，食物特征与雏鸟年龄之间存在密切的关系。年龄最小的雏鸟（2-3天大）的各项饮食特征（多样性，猎物的数量和总生物量以及个体的猎物重量）最低，远低于年龄最大的雏鸟（7-9天大）。 4-6 d龄的雏鸟的饮食特征中等。六种主要食物类型的饮食组成差异显示，个体群体和年龄类别之间存在显着差异。在2-3天和4-6天大的雏鸟的日粮中，软体鱼的数量和生物量的百分比最高，并且随着年龄的增长而降低，而中度和重度几丁质化猎物的百分比则呈现相反的趋势。父母禁止的鸣鸟可能会优先选择软嫩的猎物作为最年轻的雏鸟，并通过为它们提供更多种类的包含更多甲壳质的猎物以及植物性食物，来满足年长者的更大能量需求。为较老的雏鸟提供较难消化的猎物，这表明随着食物质量的降低，数量会增加，这暗示着最年轻的雏鸟在消化更重的几丁质化猎物的能力上可能受到生理上的限制。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号