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Habitat selection of foraging chick-rearing European shags in contrasting marine environments

机译：在不同海洋环境中觅食养雏欧洲粗毛的栖息地选择

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Impacts of anthropogenic activities on coastal seabirds might be extensive, especially in the breeding season. Identifying important foraging areas and associated habitats is important for a proper management of seabirds. To identify habitat characteristics driving the selection of foraging sites of breeding European shags Phalacrocorax aristotelis, this study used tracking data (GPS- and TDR-loggers), from 282 individual birds comprising 905 foraging trips and 27,303 dives with known locations, to create habitat selection models. To explore possible effects of regional differences in habitat on foraging behavior, the study was performed at two Norwegian colonies, Sklinna in the Norwegian Sea (65 degrees N, 11 degrees E) and Hornoya in the Barents Sea (70 degrees N, 31 degrees E), with distinct differences in seascape structure and habitat availability. Shags at Sklinna foraged further away from the colony than those at Hornoya but diving depth and duration were similar at the two colonies. In both colonies, sea depth was an important predictor of habitats selected by chick-rearing shags during foraging, with birds preferring shallow depths. At Sklinna, shags also selected for flat areas with high probability of kelp forest occurrence. There was no difference in trip length and duration between sexes, but males dived deeper than females in both colonies. This suggests that males and females might utilize different microhabitats within the same foraging area. The study discusses the application of habitat selection modeling to identify important foraging areas for coastal seabirds, and how this may contribute to the management, conservation and assessment of impacts of human activities.
机译：人为活动对沿海海鸟的影响可能很大，尤其是在繁殖季节。确定重要的觅食区和相关的栖息地对于正确管理海鸟很重要。为了确定栖息地特征，以驱动选择欧洲粗毛Ph的觅食地点，本研究使用了追踪数据（GPS和TDR记录仪），这些追踪数据来自282只个体鸟类，包括905处觅食之旅和27303场潜水，地点均在已知位置，以建立栖息地选择楷模。为了探索栖息地区域差异对觅食行为的可能影响，该研究在两个挪威殖民地进行，挪威海的Sklinna（北纬65度，东经11度）和巴伦支海的Hornoya（北纬70度，东经31度） ），在海景结构和栖息地可用性方面存在明显差异。 Sklinna的粗毛群比Hornoya的粗毛群在离该菌群更远的地方觅食，但两个菌落的潜水深度和持续时间相似。在这两个殖民地中，海深是觅食期间由养鸡的粗毛所选择的栖息地的重要预测指标，而鸟类更喜欢浅深度。在斯克林纳（Sklinna），粗毛也选择用于海带森林发生可能性高的平坦区域。男女之间的行进长度和持续时间没有差异，但在两个殖民地中，男性的潜入深度均大于女性。这表明雄性和雌性可能在同一觅食区内利用不同的微生境。该研究讨论了栖息地选择模型在确定沿海海鸟重要觅食区中的应用，以及这如何有助于管理，保护和评估人类活动的影响。

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  • 来源
    《Marine biology》 |2017年第10期|196.1-196.12|共12页
  • 作者

    Christensen-Dalsgaard Signe; Mattisson Jenny; Bekkby Trine; Gundersen Hege; May Roel; Rinde Eli; Lorentsen Svein-Hakon;

  • 作者单位

    Norwegian Univ Sci & Technol NTNU, Dept Biol, N-7491 Trondheim, Norway|Norwegian Inst Nat Res NINA, POB 5685, N-7034 Trondheim, Norway;

    Norwegian Inst Nat Res NINA, POB 5685, N-7034 Trondheim, Norway;

    Norwegian Inst Water Res NIVA, N-0349 Oslo, Norway;

    Norwegian Inst Water Res NIVA, N-0349 Oslo, Norway;

    Norwegian Inst Nat Res NINA, POB 5685, N-7034 Trondheim, Norway;

    Norwegian Inst Water Res NIVA, N-0349 Oslo, Norway;

    Norwegian Inst Nat Res NINA, POB 5685, N-7034 Trondheim, Norway;

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