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Sharing the neighbourhood: assessing the impact of kelp harvest on foraging behaviour of the European shag

机译：分享附近：评估海带收获对欧洲粗纱的觅食行为的影响

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摘要

Coastal kelp forest ecosystems create dynamic and productive habitats, supporting a wide range of epiphytic flora, invertebrates, fish and seabirds. Worldwide, kelp is harvested commercially, affecting kelp-associated animal communities. There is, however, limited knowledge of how fish and seabird respond to kelp harvest, highlighting the need to evaluate the ecological impact of harvest on all ecosystem levels. Using 6 years of GPS-tracking data, we examined the effects of kelp harvest on foraging behaviour of breeding European shags (Phalacrocorax aristotelis)from a colony in central Norway. We determined the spatial overlap between kelp harvest and foraging areas of shags and assessed the immediate, short- and long-term impacts of harvest on shag foraging behaviour. Our results demonstrated large spatial and temporal overlap in areas used by foraging shags and kelp harvest. We could not detect any clear alterations in the diving activity of shags due to kelp harvest. However, the broad temporal and spatial scale of our study constrained the detection of fine scale changes in shag behaviour in response to kelp harvest. Our study, nonetheless, identifies several issues that should be addressed before concluding on the effects of kelp harvest on seabird populations. This includes the need for experimental studies using directed and controlled harvest to investigate the effects of kelp harvest through the different trophic levels, including top predators. This is essential for ecosystem-based management of coastal resources, considering the many species composed in the coastal ecosystem.
机译：沿海海带森林生态系统创造了动态和生产性的栖息地，支持各种果皮植物群，无脊椎动物，鱼类和海鸟。全球，海带被商业收获，影响了海带相关的动物社区。然而，有限的了解鱼和海鸟如何应对海带收获，突出了评估收获对所有生态系统水平的生态影响的必要性。使用6年的GPS跟踪数据，我们研究了海带收获对挪威中部殖民地殖民繁殖欧洲牡丹（氏菌毒蕈CARISTOLIS）的影响。我们确定了海带收获和觅食地区之间的空间重叠，并评估了收获的立即，短期和长期影响伪造行为。我们的结果在觅食挖掘和海带收获使用的区域中表现出大量的空间和时间重叠。由于海带收获，我们无法检测到Shags的潜水活动中的任何明确的改变。然而，我们研究的广泛的时间和空间规模约束了响应海带收获的粗尺寸变化的检测。尽管如此，我们的研究确定了几个问题，应该在结束对海鸟群体对海带收获的影响。这包括使用指向和受控的收获对实验研究的需求来研究海带收获通过不同营养水平的影响，包括顶部捕食者。考虑到沿海生态系统组成的许多物种，这对基于生态系统的管理基于生态系统的管理至关重要。

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  • 来源
    《Marine biology》 |2020年第9期|136.1-136.10|共10页
  • 作者

    Christensen-Dalsgaard Signe; Mattisson Jenny; Norderhaug Kjell Magnus; Lorentsen Svein-Hakon;

  • 作者单位

    Norwegian Inst Nat Res NINA Dept Terr Ecol POB 5685 N-7485 Trondheim Norway;

    Norwegian Inst Nat Res NINA Dept Terr Ecol POB 5685 N-7485 Trondheim Norway;

    Inst Marine Res IMR Nye Flodevigen Vei 20 N-4817 His Norway;

    Norwegian Inst Nat Res NINA Dept Terr Ecol POB 5685 N-7485 Trondheim Norway;

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