Overlap in the wing shape of migratory, nomadic and sedentary grass parrots

Bird wing shape is highly correlated with mobility, and vagile species have more pointed wing tips than sedentary ones. Most studies of bird wing shape are biased to the northern hemisphere, and consider only two migratory syndromes (north-south migrants or sedentary species). There are major gaps in knowledge about the wing shapes of different taxa with other movement strategies (e.g. nomads) in the southern hemisphere. Parrots are a prominent southern hemisphere bird order with complex movement patterns, but their wing shapes are mostly unstudied. We test whether three metrics of wing shape of grass parrots (Neophema and Neopsephotus spp.) correspond to their purported migration syndromes (and other factors). We show that two strongly migratory grass parrots and an arid-adapted nomad had pointed wings, with flight feather longer distally and shorter proximally. However, purportedly sedentary species overlapped extensively with migrants and nomads in all aspects of wing shape, and taxo...鸟类翼形与飞行机动性高度相关，漫游性物种的翼尖相较于定居性物种更为尖锐。现有多数鸟类翼形研究存在北半球偏倚，且仅考量两种迁徙综合征（migratory syndromes）：南北迁徙物种或定居物种。对于南半球采用其他移动策略（如漫游性物种）的不同类群，其翼形相关知识存在显著空白。鹦鹉是南半球极具代表性的鸟类类群，其移动模式复杂，但翼形研究大多尚未开展。本研究针对草鹦鹉属（Neophema）与新澳鹦鹉属（Neopsephotus）的三类翼形指标，检验其是否与据称的迁徙综合征及其他影响因素相匹配。研究结果显示，两种高度迁徙性草鹦鹉以及一种适应干旱环境的漫游性物种具有尖锐翼形，其飞羽远端更长、近端更短。然而，据称的定居性物种在翼形的所有特征上均与迁徙物种和漫游性物种存在广泛重叠，且分类学...