Low first-year apparent survival of passerines in abandoned fields in northwestern Russia

First-year survival probability of migratory passerines during the period between fledging and first reproduction is a highly variable parameter having a major effect on population dynamics. We used a long-term mark–recapture dataset (2002–2018) to examine first-year survival of three passerine species breeding in abandoned agricultural fields of northwestern Russia: the Booted Warbler Iduna caligata, the Whinchat Saxicola rubetra and the Western Yellow Wagtail Motacilla flava. We banded 3457 nestlings including 1363 Booted Warblers, 1699 Whinchats and 395 Yellow Wagtails and resighted 12 Booted Warblers, 29 Whinchats and 13 Yellow Wagtails in the year after fledging. We evaluated first-year apparent survival rates using Cormack-Jolly-Seber models in MARK within the multispecies approach. We tested effect of fledge date on the first-year apparent survival. In all focal species first-year apparent survival rates were extremely low and reached the lower limits known for migratory passerin...

迁徙雀形目鸟类从离巢至首次繁殖期间的首年存活概率，是一类具有高度变异性的参数，且对种群动态具有关键性影响。本研究依托2002至2018年的长期标记重捕（mark–recapture）数据集，针对俄罗斯西北部废弃农田中繁殖的3种雀形目鸟类的首年存活情况开展调查，涉及物种分别为靴篱莺（Iduna caligata）、草地石鵖（Saxicola rubetra）与西方黄鹡鸰（Motacilla flava）。研究人员共为3457只雏鸟佩戴环志脚环，其中包含1363只靴篱莺雏鸟、1699只草地石鵖雏鸟以及395只西方黄鹡鸰雏鸟；并在雏鸟离巢后的次年，重观测到12只靴篱莺、29只草地石鵖与13只西方黄鹡鸰。本研究采用多物种研究框架，借助MARK软件中的Cormack-Jolly-Seber模型对首年表观存活率进行评估，并检验了离巢日期对首年表观存活率的影响效应。在所研究的全部目标物种中，首年表观存活率均极低，达到了迁徙雀形目鸟类已知的存活水平下限...