...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Auk >Bill shape and sexual shape dimorphism between two species of temperate hummingbirds: Black-chinned hummingbird (Archilochus alexandri) and ruby-throated hummingbird (A. Colubris)
【24h】

Bill shape and sexual shape dimorphism between two species of temperate hummingbirds: Black-chinned hummingbird (Archilochus alexandri) and ruby-throated hummingbird (A. Colubris)

机译：两种温带蜂鸟之间的比尔形状和性形状二态化：黑chin蜂（Archilochus alexandri）和红喉蜂鸟（A. Colubris）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sexual size dimorphism occurs throughout the animal kingdom, and its ecological and evolutionary causes and implications have been intensively studied. Sex-specific differences in bill curvature are known in several species of birds, including some tropical hummingbirds. Despite the importance of bill shape for foraging, comparative studies of sexual dimorphism of bill shape are few. We quantified bill shape in two temperate hummingbird species, Black-chinned Hummingbird (Archilocus alexandri) and Ruby-throated Hummingbird (A. colubris) and compared patterns of sexual shape dimorphism. Several commonly used bill-curvature indices yielded contrasting results; one found differences between species and sexes, a second identified no differences in curvature, and a circle-curvature approach revealed shape differences between species and between the sexes. By contrast, landmark-based geometric morphometric methods identified significant differences in sexual shape dimorphism and also revealed that Ruby-throated Hummingbirds exhibited significant sexual differences in shape, whereas Black-chinned Hummingbirds did not. Female Ruby-throated Hummingbirds exhibited relatively greater bill curvature than males, a pattern consistent with observations of some tropical hummingbirds. Although the causes of differences in bill-shape dimorphism between Black-chinned and Ruby-throated hummingbirds remain unclear, we hypothesize that it may be attributable to differences in the structure of the community in which each species breeds and the interplay between inter- and intraspecific competition for resources in these communities. Finally, we recommend that future studies of bill shape include geometric morphometric approaches because they are better suited than univariate approaches for identifying more complex shape differences within and among species.
机译：有性大小二态性在整个动物界中都存在，并且对其生态和进化原因及影响进行了深入研究。在几种鸟类中，包括在某些热带蜂鸟中，都知道钞票弯曲的性别差异。尽管纸币形状对觅食很重要，但纸币形状性二态性的比较研究很少。我们量化了两种温带蜂鸟的品种的票据形状，即黑chin蜂（Archilocus alexandri）和红宝石喉蜂鸟（A. colubris），并比较了性形状二态性的模式。几种常用的钞票曲率指数产生了相反的结果。一个发现物种和性别之间的差异，第二个发现曲率没有差异，圆形曲率方法揭示了物种之间和性别之间的形状差异。相比之下，基于地标的几何形态计量学方法在性形状二态性上发现了显着差异，并且还揭示了红宝石喉蜂鸟在形状上表现出显着的性别差异，而黑Hum蜂鸟则没有。红宝石喉雌性蜂鸟比雄性显示出更大的嘴曲度，这种模式与一些热带蜂鸟的观察结果一致。尽管尚不清楚黑chin和红喉喉蜂鸟的票据形状二态性差异的原因，但我们推测这可能归因于每个物种繁殖的群落结构的差异以及种间和种内之间的相互作用。这些社区中的资源竞争。最后，我们建议将来的票据形状研究包括几何形态计量学方法，因为它们比单变量方法更适合识别物种内部和物种之间更复杂的形状差异。

著录项

相似文献

  • 外文文献
获取原文

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