Low Kirtland’s Warbler fledgling survival in Wisconsin plantations relative to Michigan plantations

The Kirtland’s Warbler (Setophaga kirtlandii) is a formerly endangered habitat specialist that breeds mainly in young jack pine (Pinus banksiana) forests in northern Lower Michigan, USA. The species is conservation-reliant and depends on habitat management. Management actions have primarily focused on creating jack pine plantations, but the species also breeds in red pine (Pinus resinosa) plantations in central Wisconsin, USA. However, the plantations were not intended as breeding habitat and have suboptimal pine densities. While nesting success is similar between low-density red pine plantations and optimal jack pine habitat, it is not clear if low-density red pine plantations support high fledging survival. If high-quality nesting and post-fledging habitat are not synonymous, fledgling survival and breeding population recruitment may be low. We characterized survival, habitat use, and movement patterns of dependent Kirtland’s Warbler fledglings in Wisconsin red pine plantations and co..., These data were collected using through radio-telemetry and field vegetation sampling in Adams County, Wisconsin. Fledgling Kirtland's Warblers were radio-tagged and radio-tracked daily. Vegetation data was collected at fledgling locations and areas not used by fledglings. Fledgling survival was modeled using logistic exposure models and Mayfield survival estimation. Habitat use was modeled using logistic regression. All analyses were conducted in the R Statistical Environment to produce a manuscript accepted for publication by Ornithological Applications.,科特兰林莺（Kirtland's Warbler，Setophaga kirtlandii）是一类曾被列为濒危的生境专性物种，其繁殖地主要集中于美国密歇根州下半岛北部的幼年北美短叶松（jack pine, Pinus banksiana）林。该物种属于依赖保护类群，生存依赖人工生境管理。以往的管理措施主要以营造北美短叶松人工林为核心，但该物种也可在美国威斯康星州中部的北美红松（Pinus resinosa）人工林中繁殖。不过此类人工林并非为该物种的繁殖生境设计，且松树密度未达最优水平。尽管低密度北美红松人工林的筑巢成功率与最优生境的北美短叶松林相当，但目前尚不明确低密度北美红松人工林能否支撑较高的离巢幼鸟存活率。若优质筑巢生境与离巢后栖息生境并非同一范畴，则离巢幼鸟存活率及繁殖种群补充率或处于较低水平。 我们针对威斯康星州北美红松人工林中依赖亲代的科特兰林莺离巢幼鸟的存活率、生境利用模式与移动模式及相关内容开展了特征刻画。本研究数据通过无线电遥测与野外植被采样采集自威斯康星州亚当斯县。研究人员对科特兰林莺离巢幼鸟进行无线电标记，并每日开展追踪调查。在幼鸟的定位点位以及未被幼鸟利用的区域均采集了植被数据。本研究采用逻辑暴露模型（logistic exposure models）与梅菲尔德存活率估计法（Mayfield survival estimation）对离巢幼鸟存活率进行建模分析，并通过逻辑回归（logistic regression）对生境利用情况进行建模。所有数据分析工作均在R统计环境（R Statistical Environment）中完成，相关研究论文已被《Ornithological Applications》（鸟类应用）期刊接收待刊。