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首页> 外文期刊>Marine ecology progress series >Invisible trophic links? Quantifying the importance of non-standard food sources for key intertidal avian predators in the Eastern Atlantic
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Invisible trophic links? Quantifying the importance of non-standard food sources for key intertidal avian predators in the Eastern Atlantic

机译：看不见的营养联系？量化非标准食物来源对东大西洋主要潮间带鸟类捕食者的重要性

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摘要

Coastal wetlands are heterogeneous systems with multiple inputs and complex interactions within local food webs. Interpreting such complexity is limited by incomplete knowledge of trophic interactions among organisms. Although widely recognized as secondary consumers and predators of intertidal macroinvertebrates, shorebirds can also consume lower-trophic-level food sources, and frequently forage in adjacent supratidal habitats. To ascertain potential trophic links between overwintering shorebirds and alternative non-standard food sources, we collected carbon and nitrogen stable isotope data of shorebirds and benthic organisms from 4 coastal wetlands along the Eastern Atlantic: Tejo Estuary, Portugal; Sidi-Moussa, Morocco; Banc d'Arguin, Mauritania; and Bijagos Archipelago, Guinea-Bissau. Using dual-isotope Bayesian mixing models, we evaluated the relative importance of intertidal benthic macroinvertebrates and 3 other potential food sources (biofilm and seagrass rhizomes from intertidal areas, and saltpan macroinvertebrates) in the diet of wintering shorebirds. Although intertidal macroinvertebrates form the main part of most shorebird species' diet, our data revealed that supratidal saltpans can contribute to >30% of the biomass ingested by several shorebird species. Seagrass rhizomes represented >10% of the diet of several species in Banc d'Arguin and in Sidi Moussa. Little stint Calidris minuta appears to consume biofilm on all 3 wetlands where they were sampled, which is the first time biofilm consumption by shorebirds has been detected along the East Atlantic Flyway. Empirical evidence for generalized consumption of alternative food sources by intertidal avian predators show the greater complexity and food web connectivity in and of intertidal habitats, and also with the surrounding habitats.
机译：沿海湿地是异质系统，在当地食物网内具有多种输入和复杂的相互作用。解释这种复杂性受到对生物之间营养相互作用的不完全了解的限制。尽管被广泛认为是潮间带大型无脊椎动物的次要消费者和捕食者，但shore鸟也可以食用营养水平较低的食物，并经常在相邻的上生栖地中觅食。为了确定越冬的shore鸟和其他非标准食物来源之间的潜在营养联系，我们收集了来自东大西洋沿岸4个沿海湿地的shore鸟和底栖生物的碳和氮稳定同位素数据：葡萄牙Tejo河口；摩洛哥西迪穆萨；毛里塔尼亚Banc d'Arguin；和几内亚比绍的比贾戈斯群岛。使用双同位素贝叶斯混合模型，我们评估了越冬的海鸟的饮食中潮间带底栖无脊椎动物和其他3种潜在食物来源（潮间带的生物膜和海草根茎以及盐盘宏观无脊椎动物）的相对重要性。尽管潮间带大型无脊椎动物是大多数shore类动物饮食的主要组成部分，但我们的数据显示，上翅盐pan可占几种shore类动物摄入的生物量的30％以上。海藻的根茎占Banc d'Arguin和Sidi Moussa几种食物的10％以上。很少有人认为Calidris minuta会在采样的所有3个湿地上消耗生物膜，这是在东大西洋航线上首次检测到shore鸟的生物膜消耗。潮间带鸟类捕食者普遍消费替代食物来源的经验证据表明，潮间带生境和周围生境以及周围生境具有更大的复杂性和食物网的连通性。

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  • 来源
    《Marine ecology progress series》 |2017年第20期|219-232|共14页
  • 作者

    Lourenco Pedro M.; Catry Teresa; Lopes Ricardo J.; Piersma Theunis; Granadeiro Jose P.;

  • 作者单位

    Univ Lisbon, Fac Ciencias, Dept Biol Anim, Ctr Estudos Ambiente & Mar CESAM, P-1749016 Lisbon, Portugal;

    Univ Lisbon, Fac Ciencias, Dept Biol Anim, Ctr Estudos Ambiente & Mar CESAM, P-1749016 Lisbon, Portugal;

    Univ Porto, Ctr Invest Biodiversidade & Recursos Genet CIBIO, InBIO Lab Associado, P-4485661 Vairao, Portugal;

    NIOZ Royal Netherlands Inst Sea Res, Dept Coastal Syst, POB 59, NL-1790 AB Den Burg, Texel, Netherlands|Univ Utrecht, POB 59, NL-1790 AB Den Burg, Texel, Netherlands|Univ Groningen, Chair Global Flyway Ecol, Conservat Ecol Grp, Groningen Inst Evolutionary Life Sci GELIFES, POB 11103, NL-9700 CC Groningen, Netherlands;

    Univ Lisbon, Fac Ciencias, Dept Biol Anim, Ctr Estudos Ambiente & Mar CESAM, P-1749016 Lisbon, Portugal;

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  • 正文语种 eng
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  • 关键词

    Shorebird; Diet; Macroinvertebrate; Biofilm; Saltpan; Seagrass; Wetland;

    机译：bird;饮食;无脊椎动物;生物膜;盐锅;海草;湿地;

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