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The diet of Atlantic Yellow-legged Gulls (Larus michahellisatlantis) at an oceanic seabird colony: estimating predatory impact upon breeding petrels

机译:在海洋海鸟殖民地的大西洋黄脚海鸥(Larus michahellisatlantis)的饮食:估计对繁殖海燕的掠食性影响

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摘要

The diet and breeding ecology of YellowleggedGulls (Larus michahellis atlantis) were studied on Selvagem Grande, North Atlantic in the nesting season of 2007. We collected and analyzed 715 pellets from adults. The most frequent prey were White-faced Stormpetrels (Pelagodroma marina; present on 40.8% of all pellets) and the endemic land snails (Theba macandrewiana; present on 36.5% of all pellets). Other birds, namely Cory’s Shearwaters (Calonectris diomedea), Macaronesian Shearwaters (Puffinus assimilis), Bulwer’s Petrels (Bulweria bulwerii), and Band-rumped Storm-petrels (Oceanodroma castro) were relatively less frequent, but overall, seabirds were present in ca. 50% of all pellets, representing an estimated 60.4% of all mass consumed by gulls. We estimate that the contribution of seabirds to the overall caloric balance accounted for 82.5% of all energy consumed. The number of gull pairs breeding on Selvagem Grande was 12 on 2005 and 2007. Breeding success was low (0.92 and 0.25 juveniles per breeding pair, respectively). Us ing a simple bioenergetics model, we estimate the breeding gull population to have the potential to consume approximately 4,847 adult/sub-adult seabirds in 3.5 months in order to meet its energetic requirements.The importance of the estimated predation levels is discussed and some management actions are suggested.
机译:在2007年的筑巢季节,在北大西洋的塞尔瓦吉姆(Selfagem Grande)研究了黄腿鸥(Larus michahellis atlantis)的饮食和繁殖生态。我们收集并分析了715头成年成年仔鱼的繁殖情况。最常见的猎物是白面Storm(Pelagodroma marina;占所有颗粒的40.8%)和地方蜗牛(Theba macandrewiana;占所有颗粒的36.5%)。其他鸟类,例如科里的Shearwaters(Calonectris diomedea),Macaronesian的Shearwaters(Puffinus assimilis),Bulwer的Petrels(Bulweria bulwerii)和Band-rumped风暴海燕(Oceanodroma castro)的发生频率相对较低,但总体而言,约有海鸟存在。所有颗粒的50%,约占海鸥消耗的所有质量的60.4%。我们估计,海鸟对总热量平衡的贡献占所有消耗能量的82.5%。 2005年和2007年,在Selvagem Grande上繁殖的海鸥对数量为12。繁殖成功率很低(每个繁殖对分别有0.92和0.25个幼体)。通过简单的生物能学模型,我们估计繁殖海鸥种群有潜力在3.5个月内消耗约4,847只成年/亚成年海鸟,以满足其能量需求。讨论了捕食水平的重要性并进行了一些管理建议采取行动。

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    Matias, Rafael; Catry, Paulo;

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  • 年度 2010
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  • 正文语种 eng
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