Nicholas School of the Environment, Durham, NC 27708.
Geography Department, University of California, Los Angeles, CA 90095-1524.
Proc Natl Acad Sci U S A. 2023 Feb 28;120(9):e2217904120. doi: 10.1073/pnas.2217904120. Epub 2023 Feb 21.
We consider the distribution of fruit pigeons of the genera and on the island of New Guinea. Of the 21 species, between six and eight coexist inside humid lowland forests. We conducted or analyzed 31 surveys at 16 different sites, resurveying some sites in different years. The species coexisting at any single site in a single year are a highly nonrandom selection of the species to which that site is geographically accessible. Their sizes are both much more widely spread and more uniformly spaced than in random sets of species drawn from the locally available species pool. We also present a detailed case study of a highly mobile species that has been recorded on every ornithologically explored island in the West Papuan island group west of New Guinea. That species' rareness on just three well-surveyed islands within the group cannot be due to an inability to reach them. Instead, its local status decreases from abundant resident to rare vagrant in parallel with increasing weight proximity of the other resident species.
我们研究了新几内亚热带岛屿上 和 两个属的果鸠分布情况。这 21 个物种中，有 6-8 种在潮湿的低地森林中共存。我们在 16 个不同的地点进行了 31 次调查，其中一些地点在不同年份进行了重测。在某一年的单一地点共存的物种，是该地点在地理上可到达的物种中高度非随机选择的物种。它们的体型比从当地可用物种库中随机抽取的物种分布范围更广，间隔也更均匀。我们还详细研究了一个高度移动的物种，该物种在新几内亚以西的西巴布亚岛群中每一个鸟类调查过的岛屿上都有记录。该物种在该群岛内仅三个调查充分的岛屿上非常罕见，这并不是因为无法到达这些岛屿。相反，它在当地的地位从丰富的常驻物种变为罕见的漂泊物种，与其他常驻物种的体重接近程度呈平行变化。
