Species ranges, diversity and life history of Neotropical montane birds

热带山区的鸟类种类比地球上任何其他地区都多。这种高度多样性的一个原因是，随着物种的消失和被其他物种取代，鸟类群落从低地到山顶发生了巨大的变化。我的研究旨在了解为什么许多物种只局限于热带山脉斜坡上海拔范围的一部分。换句话说，是什么阻止了可以长距离飞行的低地鸟类在只有500米高的上坡栖息地定居？此外，我的研究建立在一个长期监测数据库的基础上，以评估热带鸟类种群的稳定性，为确定这些种群是在增长还是在下降提供关键信息。这项研究将在新热带地区的三个地点进行：秘鲁安第斯山脉的马努生物圈保护区，哥伦比亚中部的塔塔马国家公园和哥斯达黎加的蒙特维德云雾森林。这些地区代表了主要的生物多样性“热点”。例如，沿着马努岛75公里的样带，我们可以发现1100种鸟类，比整个北美都多。第一项倡议将测试关于鸟类与其他物种（如竞争对手、互惠主义者、食物资源）的相互作用或鸟类耐受极端环境条件（如高海拔地区的低温）的能力如何决定物种在山腰上的生存位置的替代假设。第二项计划将检查被绑起来的鸟类的数据，这些鸟类已经被重新捕获并监测了多年，以估计热带物种的寿命和种群变化情况。它还将应用新技术来了解物种如何对新环境做出反应。热带山区已被列为气候变化将对动植物产生不成比例的巨大影响的地区。世界上超过四分之一的濒危鸟类栖息在这些地区。在下个世纪，随着气温的升高，许多热带物种可能被迫向上坡迁移。任何阻止它们在新环境中殖民的因素都会增加它们灭绝的风险。目前，我们对热带物种如何应对不断变化的温度或物种间的相互作用是否会影响上坡运动以应对变暖知之甚少。该研究将提供这些数据，填补许多热带鸟类的重要知识空白，同时改善我们对这些生物多样性热点地区的保护策略。

Tropical mountains have more bird species than any other region on earth. One reason for this high diversity is that bird communities change dramatically from the lowlands to mountain tops as species drop out and are replaced by others. My research aims to understand why many species are restricted to just a portion of the elevation range available on the slopes of tropical mountains. In other words, what prevents lowland birds, which can fly long distances, from colonizing habitats only 500 meters upslope? Additionally, my research builds upon a long-term monitoring database to evaluate the stability of tropical bird populations, supplying crucial information to determine whether such populations are growing or in decline. This research will be carried out in three sites across the Neotropics: the Manu Biosphere Reserve in the Andes of Peru, Tatama National Park in central Colombia, and the Monteverde Cloud Forest of Costa Rica. These areas represent prime biodiversity "hotspots". For example, along a 75-km transect in Manu, we can find 1100 bird species, more than in all of North America. The first initiative will test alternative hypotheses regarding how the interactions of birds with other species (e.g., competitors, mutualists, food resources) or the ability of birds to tolerate extreme environmental conditions (e.g., cold temperatures at high altitudes) determine where species live on a mountainside. The second initiative will examine data from banded birds, which have been recaptured and monitored across years, to estimate how long tropical species live and how populations are changing. It will also apply new technologies to understand how species will respond to novel environments. Tropical mountains have been targeted as regions where climate change will have disproportionately large impacts on plants and animals. More than a quarter of the world's endangered bird species inhabit these regions. Over the next century, many tropical species could be forced to move upslope as temperatures increase. Anything that prevents them from colonizing new environments will increase their risk of extinction. Currently, we know very little about how tropical species will respond to changing temperatures or whether species interactions could affect upslope movements in response to warming. This research will provide these data and fill important knowledge gaps for many tropical bird species while improving our conservation strategies for these biodiversity hotspots.