Foraging movements and habitat niche of two closely related seabirds breeding in sympatry

Isabel Afan; Joan Navarro; Laura Cardador; Francisco Ramirez; Akiko Kato; Beneharo Rodriguez; Yan Ropert-Coudert; Manuela G. Forero

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Foraging movements and habitat niche of two closely related seabirds breeding in sympatry

机译：两种在繁殖中密切相关的海鸟的觅食运动和栖息地生态位

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As central-place foragers, pelagic seabirds are constrained by spatiotemporal heterogeneity to find productive marine areas and compete for prey. We analysed 97 foraging trips to study the movement and oceanographic characteristics of foraging habitats of two different-yet closely related-species of shearwaters (Scopoli's shearwater Calonectris diomedea and Cory's shearwater C. borealis) breeding in sympatry in the Mediterranean. We combined various methodological approaches (GPS-tracking, species distribution modelling and stable isotope analysis) to explore the foraging strategies of these two species. Isotopic results suggested that trophic habits of both shearwater species were similar, mainly based on pelagic fish consumption. Foraging areas of both species were characterized by shallow waters near the colony. Both shearwater species exploited persistent productive marine areas. The foraging areas of the two species broadly overlapped during the incubation period, but during chick-rearing period, Scopoli's shearwaters apparently foraged in different areas than Cory's shearwaters.

机译：作为中心地带的觅食者，远洋海鸟受到时空异质性的限制，以寻找生产性海洋区域并争夺猎物。我们分析了97次觅食旅行，以研究在地中海沿岸交感动物中繁殖的两个不同但密切相关的剪力水（Scopoli剪水Calonectris diomedea和Cory剪水C.borealis）的觅食栖息地的运动和海洋学特征。我们结合了各种方法学方法（GPS跟踪，物种分布建模和稳定同位素分析）来探索这两个物种的觅食策略。同位素结果表明，两种剪切水物种的营养习性相似，主要基于上层鱼类的消费。两种物种的觅食区均以殖民地附近的浅水区为特征。两种剪切水物种都利用了持续生产性海洋区域。在孵化期间，这两个物种的觅食区域广泛重叠，但是在雏鸡饲养期间，Scopoli的剪水明显在与Cory的剪水不同的区域觅食。

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《Marine biology》 |2014年第3期|657-668|共12页
作者
Isabel Afan; Joan Navarro; Laura Cardador; Francisco Ramirez; Akiko Kato; Beneharo Rodriguez; Yan Ropert-Coudert; Manuela G. Forero;
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作者单位

Laboratorio de SIG y Teledeteccion (LAST-EBD), Estacion Biologica de Donana (EBD-CSIC), C/Americo Vespucio s, 41092 Sevilla, Spain;

Institut de Ciencies del Mar (ICM-CSIC), Passeig Maritim de la Barceloneta 37-49,08003 Barcelona, Spain;

Forest Sciences Center of Catalonia (CTFC), Crta. de Sant Llorenc de Morunys km 2, 25280 Solsona, Spain;

Departamento de Biologia de la Conservacion, Estacion Biologica de Donana (EBD-CSIC), C/Americo Vespucio s, 41092 Sevilla, Spain;

IPHC, Universite de Strasbourg, 23 rue Becquerel, 67087 Strasbourg, France ,CNRS, UMR7178, 67037 Strasbourg, France;

SEO/BirdLife, Delegacion de Canarias, C/Libertad 22, 38296 La Laguna, Tenerife, Islas Canarias, Spain;

IPHC, Universite de Strasbourg, 23 rue Becquerel, 67087 Strasbourg, France ,CNRS, UMR7178, 67037 Strasbourg, France;

Departamento de Biologia de la Conservacion, Estacion Biologica de Donana (EBD-CSIC), C/Americo Vespucio s, 41092 Sevilla, Spain;

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Foraging movements and habitat niche of two closely related seabirds breeding in sympatry

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