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Breeding dispersal movements of Dupont’s Lark Chersophilus duponti in fragmented landscape
Bird Conservation International ( IF 1.5 ) Pub Date : 2021-03-08 , DOI: 10.1017/s095927092100006x
CRISTIAN PÉREZ-GRANADOS , PEDRO SÁEZ-GÓMEZ , GERMÁN M. LÓPEZ-IBORRA

Understanding patterns of dispersal behaviour of threatened species is important in conservation biology and population ecology, especially in fragmented landscapes. Dupont’s Lark Chersophilusduponti is a threatened passerine whose European population has declined by around 40% in the last decade. To study natal and breeding dispersal of the species, we used a long-term mark-recapture dataset (2011–2019) and analysed the records of 32 males (39 dispersal movements) and five females (five dispersal movements) captured during the breeding season at Rincón de Ademuz (Valencia, eastern Spain). Adult birds had a median breeding dispersal of 154 m (Q25-Q75 = 70.0–300.3). Among these captures, two adult males dispersed to a new patch of habitat separated by more than 5,800 m. Only one out of 26 nestlings ringed was trapped as an adult bird, which occurred at a site different from the natal territory (4,500 m). Our results show a low breeding dispersal for the species and are, in essence, in agreement with previous studies carried out in the Ebro Valley metapopulation, one of the core areas for the species in Europe. Nonetheless, unlike in the Ebro Valley, we detected movements of adult birds between habitat patches. The low recovery rate of young birds suggests that they left their natal sites and moved outside the study area or that their survival rate was very low. Future studies focused on the post-fledging survival rate and natal dispersal movements are essential to determine effective conservation measures for the species. Habitat management actions in occupied and potential sites should be carried out close to the areas inhabited by the species to increase the success rate of the interventions and the effective dispersal and therefore population connectivity.



中文翻译:

杜邦云雀在碎片化景观中的繁殖扩散运动

了解受威胁物种的扩散行为模式对于保护生物学和种群生态学很重要,尤其是在碎片化的景观中。Dupont's Lark Chersophilus duponti是一种受威胁的雀形目,其欧洲人口在过去十年中下降了约 40%。为了研究该物种的出生和繁殖扩散,我们使用了长期标记重新捕获数据集(2011-2019)并分析了在繁殖季节捕获的 32 名雄性(39 次分散运动)和 5 名雌性(5 次分散运动)的记录在 Rincón de Ademuz(西班牙东部瓦伦西亚)。成年鸟的平均繁殖扩散距离为 154 m (Q25-Q75 = 70.0-300.3)。在这些捕获中,两只成年雄性分散到相隔超过 5,800 米的新栖息地。26 只成圈的雏鸟中只有一只被困成成年鸟,这发生在与出生地不同的地点(4,500 米)。我们的结果表明该物种的繁殖分散度较低,本质上是 与之前在欧洲该物种的核心区域之一埃布罗河谷元种群中进行的研究一致。尽管如此,与埃布罗河谷不同的是,我们检测到成鸟在栖息地斑块之间的运动。幼鸟的低恢复率表明它们离开了出生地并搬到了研究区域之外,或者它们的存活率非常低。未来的研究侧重于羽化后的存活率和出生后的扩散运动,对于确定该物种的有效保护措施至关重要。应在已占领和潜在地点的栖息地管理行动靠近物种居住的区域进行,以提高干预的成功率和有效的分散,从而提高种群连通性。尽管如此,与埃布罗河谷不同的是,我们检测到成鸟在栖息地斑块之间的运动。幼鸟的低恢复率表明它们离开了出生地并搬到了研究区域之外,或者它们的存活率非常低。未来的研究侧重于羽化后的存活率和出生后的扩散运动,对于确定该物种的有效保护措施至关重要。应在已占领和潜在地点的栖息地管理行动靠近物种居住的区域进行,以提高干预的成功率和有效的分散,从而提高种群连通性。尽管如此,与埃布罗河谷不同的是,我们检测到成鸟在栖息地斑块之间的运动。幼鸟的低恢复率表明它们离开了出生地并搬到了研究区域之外,或者它们的存活率非常低。未来的研究侧重于羽化后的存活率和出生后的扩散运动,对于确定该物种的有效保护措施至关重要。应在已占领和潜在地点的栖息地管理行动靠近该物种居住的区域进行,以提高干预的成功率和有效的分散,从而提高种群连通性。幼鸟的低恢复率表明它们离开了出生地并搬到了研究区域之外,或者它们的存活率非常低。未来的研究侧重于羽化后的存活率和出生后的扩散运动,对于确定该物种的有效保护措施至关重要。应在已占领和潜在地点的栖息地管理行动靠近物种居住的区域进行,以提高干预的成功率和有效的分散,从而提高种群连通性。幼鸟的低恢复率表明它们离开了出生地并搬到了研究区域之外,或者它们的存活率非常低。未来的研究侧重于羽化后的存活率和出生后的扩散运动,对于确定该物种的有效保护措施至关重要。应在已占领和潜在地点的栖息地管理行动靠近物种居住的区域进行,以提高干预的成功率和有效的分散,从而提高种群连通性。

更新日期:2021-03-08
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