The Congo Grey Parrot Psittacus erithacus has experienced a severe population breakdown in recent decades. The rainforests of the Korup region in Southwest Cameroon may harbour a large population of this species, but density and population estimates from this area remain controversial. Before the 2016 breeding season, we surveyed Grey Parrots along transects (621.1 km survey effort) in three adjacent landscape types: primary forest in Korup National Park (KNP), smallholder agroforestry matrix (AFM), and industrial oil palm plantation (OPP). We also collected information on the trees used for nesting, feeding and roosting. Using Distance analysis, we estimated relatively low densities of stationary flocks, ranging from 0.30 ind./km2 in KNP, over 0.82 ind./km2 in OPP to 2.70 ind./km2 in the AFM. Parrots were observed feeding or roosting in 17 tree species, of which 15 were located in AFM alone. Feeding was most often observed on cultivated Elaeis guineensis and Dacryodes edulis, but never in maize. The detected parrot densities probably reflect declines within the period 2008–2016, suggesting that the species’ recent IUCN uplisting to ‘Endangered’ and transfer to CITES Appendix I was indeed justified. Our results also suggest that traditional smallholder agroforestry may play a role in habitat conservation strategies, since these forms of cultivation may maintain important breeding and feeding opportunities for Congo Grey Parrots.

最近几十年来，刚果灰鹦鹉鹦鹉（Psittacus erithacus）经历了严重的种群崩溃。喀麦隆西南部的科鲁普地区的雨林可能藏有该物种的大量种群，但该地区的密度和种群估计仍存在争议。在2016年繁殖季节之前，我们对沿着三个相邻景观类型的样带进行了灰鹦鹉调查（调查工作量为621.1公里）：库鲁普国家公园（KNP）的原始森林，小农农林业矩阵（AFM）和工业油棕种植园（OPP）。我们还收集了有关用于筑巢，觅食和栖息的树木的信息。使用距离分析，我们估算出相对较低的固定群密度，KNP范围从0.30 ind./km 2到0.82 ind./km 2以上在AFM中，OPP的数值为2.70 ind./km 2 观察到鹦鹉在17种树种中觅食或栖息，其中15种仅在AFM中。喂养最常耕地上观察到油棕和Dacryodes贻贝，但从未在玉米。所检测到的鹦鹉密度可能反映了2008-2016年期间的下降，这表明该物种最近的IUCN上调为“濒危”并转移到CITES附录I的确是合理的。我们的结果还表明，传统的小农农林业可能在栖息地保护策略中发挥作用，因为这些种植形式可能为刚果灰鹦鹉保持重要的繁殖和觅食机会。