Predominantly terrestrial foraging and reproductive gains from a high trophic level diet in roof-nesting Herring Gulls (<em>Larus argentatus</em>)

Wild animal species often use human-modified environments for foraging and reproduction, but this may require dietary diversification with fitness consequences. The extent to which colonising species successfully exploit such habitats is poorly understood. We used stable isotope analysis of egg yolk to investigate the association between foraging choices and reproductive success in 102 female Herring Gulls (Larus argentatus) over 3 years in a roof-nesting, pericoastal breeding colony. Stable isotopes of egg yolk predominantly reflect maternal diet during egg production. We measured δ13C as an indicator of foraging habitat, and δ15N as an indicator of trophic level. We predicted diverse foraging choices across marine, terrestrial, and urban environments due to gulls’ generalist foraging strategy and the variety of nearby foraging opportunities. We also predicted higher reproductive success associated with marine feeding compared to terrestrial feeding or feeding on human food and refuse,..., , # Predominantly terrestrial foraging and reproductive gains from a high trophic level diet in roof-nesting Herring Gulls (*Larus argentatus*) Dataset DOI: [10.5061/dryad.05qfttfg4](10.5061/dryad.05qfttfg4) ## Description of the data and file structure These data were collected to investigate the association between foraging choices and reproductive success in 102 female Herring Gulls (*Larus argentatus*) over 3 years in a roof-nesting, pericoastal breeding colony. Stable isotopes of egg yolk were used as an indicator of maternal foraging habitat and trophic level during egg production. ### Files and variables #### File: Pred_Terr_For_Code.R **Description:** R code used to perform statistical analyses on the data. #### File: Pred_Terr_For_Data.csv **Description:** Table containing the data used for the statistical analyses. ##### Variables * NestID: Unique identifiers for each clutch surveyed. * Egg: Egg's position in the clutch laying sequence (A, B, or C). * Clutch_Size: Tota...,野生动物物种常借助人类改造的环境开展觅食与繁殖活动，但这往往需要调整饮食结构，并伴随适合度层面的相关后果。目前学界对拓殖物种成功利用此类生境的程度仍知之甚少。本研究通过蛋黄稳定同位素分析，对一处屋顶筑巢的近海岸繁殖种群中的102只雌性银鸥（*Larus argentatus*）开展了为期3年的追踪，旨在探究其觅食选择与繁殖成功率之间的关联。蛋黄中的稳定同位素可主要反映产卵期母体的饮食情况。我们以δ¹³C作为觅食生境的指示指标，以δ¹⁵N作为营养级的指示指标。鉴于银鸥的广食性觅食策略及周边多样的觅食机会，我们预测其会在海洋、陆地与城市环境中展现出多样化的觅食选择。同时我们还预测，相较于陆地觅食或依赖人类食物与废弃物觅食，海洋觅食会带来更高的繁殖成功率…… # 屋顶筑巢银鸥（*Larus argentatus*）以陆地觅食为主并从高营养级饮食中获得繁殖收益 数据集DOI：[10.5061/dryad.05qfttfg4](10.5061/dryad.05qfttfg4) ## 数据与文件结构说明 本数据集采集自一处为期3年的屋顶筑巢近海岸繁殖种群，用于探究其中102只雌性银鸥（*Larus argentatus*）的觅食选择与繁殖成功率之间的关联。研究采用蛋黄稳定同位素作为产卵期母体觅食生境与营养级的指示指标。 ### 文件与变量 #### 文件：Pred_Terr_For_Code.R **描述：** 用于对本数据集开展统计分析的R代码。 #### 文件：Pred_Terr_For_Data.csv **描述：** 包含统计分析所用数据的表格。 ##### 变量 * NestID：每一个被调查的窝卵的唯一标识符。 * Egg：该卵在窝卵产卵序列中的位置（A、B或C）。 * Clutch_Size：总窝卵数（原文截断为"Tota..."）。