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Including dynamics in the equation: Tree growth rates and host specificity of vascular epiphytes
Journal of Ecology ( IF 5.3 ) Pub Date : 2019-12-28 , DOI: 10.1111/1365-2745.13333 Katrin Wagner 1 , Gerhard Zotz 1, 2
中文翻译：
在方程式中包括动力学：树木生长速度和维管附生植物的宿主特异性
更新日期：2019-12-29
Journal of Ecology ( IF 5.3 ) Pub Date : 2019-12-28 , DOI: 10.1111/1365-2745.13333 Katrin Wagner 1 , Gerhard Zotz 1, 2
Affiliation
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- The forest canopy is home to a rich biota. One salient feature are the dynamics of the habitat‐building trees, which are growing and eventually vanishing. Tree species strongly differ in growth rates, final size and longevity. Nevertheless, these inherent dynamics have been a blind spot in studies on host specificity of vascular epiphytes (vascular plants dwelling on trees without parasitizing them)—not least because tree growth rates and longevity are usually unknown in highly diverse tropical forests. The present study aims at tackling this blind spot.
- We compared epiphyte abundances (>23,000 individuals) found on 285 individuals of four focal tree species in a lowland moist forest in Panama. Data on repeated dbh censuses from a permanent tree plot provided the unique opportunity to estimate the age of our sampled trees. We compared the relative importance of tree longevity for host biases with that of other host tree characteristics, namely microclimatic conditions and bark acidity, rugosity and stability.
- The studied tree species differ in host quality and epiphyte species partly differ in host preferences. The conclusions concerning relative host tree quality depend hugely on whether or not different tree growth rates are considered. Comparing these conclusions allows important insights into the role of tree longevity in shaping epiphyte communities. Relating tree trait differences to the observed distributions of epiphytes among the focal tree species shows how the simultaneous action of various tree characteristics causes host biases.
- Synthesis. This study highlights the substantial but, up to now, hidden role of different tree growth rates for host tree specificity of vascular epiphytes. Future investigations need to consider this possibly confounding factor adequately to avoid spurious conclusions.
中文翻译：
在方程式中包括动力学：树木生长速度和维管附生植物的宿主特异性
- 林冠层是丰富的生物群落的家园。一个显着的特征是生境树木生长的动力，这些树木正在生长并最终消失。树木的生长速度，最终大小和寿命差异很大。然而，这些固有的动力学特性一直是研究血管附生植物（没有寄生在树上的维管植物）寄主特异性的盲点-尤其是因为在高度多样化的热带森林中树木的生长速度和寿命通常是未知的。本研究旨在解决这一盲点。
- 我们比较了巴拿马低地湿润森林中4种重点树种的285个个体上发现的附生植物丰度（> 23,000个个体）。来自永久树地的重复dbh人口普查数据提供了独特的机会来估计我们采样树的年龄。我们比较了树木寿命对于寄主偏倚的相对重要性与其他树木特征（即微气候条件和树皮酸度，皱纹度和稳定性）的相对重要性。
- 所研究的树种的寄主质量不同，而附生树种的寄主偏好则部分不同。关于相对宿主树质量的结论在很大程度上取决于是否考虑不同的树木生长速率。比较这些结论可以使人们深入了解树木寿命在塑造附生植物群落中的作用。将树木性状差异与在焦点树种之间观察到的附生植物的分布联系起来，表明了各种树木特征的同时作用是如何引起寄主偏差的。
- 综合。这项研究强调了不同的树木生长速率对血管附生植物宿主树特异性的实质性但到目前为止的隐性作用。未来的研究需要充分考虑这一可能的混杂因素，以免得出虚假结论。
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