Goffin Bernice, Felgueiras Marcial, Hof Anouschka R
Wildlife Ecology and Conservation Group, Wageningen University, 6708 PB Wageningen, The Netherlands.
A Rocha, Apartado 41, 8501-903 Mexilhoeira Grande, Portugal.
Animals (Basel). 2020 Nov 25;10(12):2208. doi: 10.3390/ani10122208.
Many long-distance migratory bird species are in decline, of which environmental changes, such as climate change and land-use changes, are thought to be important drivers. The effects of environmental change on the migration of these birds have often been studied during spring migration. Fewer studies have explored the impacts of environmental change on autumn migration, especially at stopover sites. However, stopover sites are important, as the quality of these sites is expected to change over time. We investigated impacts of local environmental conditions on the migration strategy and body condition of the Pied Flycatcher () at an autumn migration stopover site using long-term ringing data (1996-2018) and local environmental conditions. We found that although the arrival and departure dates of birds at the stopover site remained unchanged, the body condition (fat score) of the individuals caught decreased, and the stopover duration increased. This suggests that conditions at the stopover site during the autumn migration period have deteriorated over time. This study emphasizes the importance of suitable stopover sites for migratory birds and stresses that changes in environmental conditions during the autumn migration period may be contributing to the current decline in long-distance migratory passerines.
许多长途迁徙鸟类的数量正在减少，其中环境变化，如气候变化和土地利用变化，被认为是重要的驱动因素。环境变化对这些鸟类迁徙的影响通常在春季迁徙期间进行研究。较少有研究探讨环境变化对秋季迁徙的影响，尤其是在中途停歇地。然而，中途停歇地很重要，因为预计这些地点的质量会随时间变化。我们利用长期环志数据（1996 - 2018年）和当地环境条件，研究了当地环境条件对秋季迁徙中途停歇地的斑姬鹟迁徙策略和身体状况的影响。我们发现，尽管鸟类在中途停歇地的到达和离开日期保持不变，但捕获个体的身体状况（脂肪评分）下降，中途停歇持续时间增加。这表明秋季迁徙期间中途停歇地的条件随时间恶化。这项研究强调了合适的中途停歇地对候鸟的重要性，并强调秋季迁徙期间环境条件的变化可能是导致目前长途迁徙雀形目鸟类数量下降的原因之一。
