血液代谢物和储存脂肪组织分析揭示了欧亚芦苇和莎草莺的不同迁徙策略

Q4 Agricultural and Biological Sciences Western Birds Pub Date : 2022-10-10 DOI:10.3390/birds3040024
P. Araújo, I. Viegas, L. P. da Silva, P. B. Lopes, L. Tavares, J. Ramos
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引用次数: 2

摘要

鸟类迁徙的总体速度受限于迁徙初期所储存的燃料量。调动脂肪的能力对于能够表现出不同迁徙策略的候鸟来说是至关重要的。鸟类在夜间飞行时调动甘油三酯,从而增加循环脂肪酸和甘油,以满足飞行的代谢需求。在春秋两季的葡萄牙中途停留点捕获了欧亚芦莺(Acrocephalus scirpaceus)和沙叶莺(Acrocephalus schoenobaenus)。这些物种的选择是基于它们不同的迁徙策略和迁徙过程中的饮食偏好。分析血液代谢物和脂肪组成以确定其营养状况。在飞行后禁食期间,莎草林莺的血液甘油三酯和甘油水平高于非禁食时期。此外,在飞行后禁食和非禁食条件下,芦苇莺的甘油三酯和甘油水平均高于欧亚苇莺。所发现的差异可能反映了与迁徙周期中停留次数相关的重新进食活动(例如,强烈进食)的不同方法。在迁徙飞行的长期运动中,饮食偏好会影响可供氧化的脂肪成分。对其皮下脂肪组成的核磁共振分析显示,莎草林莺的多不饱和脂肪酸含量高于欧亚苇莺。观察到的不同脂质分布和摄食生态的差异可能解释了这些物种不同的迁徙策略。总体而言,尽管它们的生态相似,但我们的研究物种在血液代谢物水平和皮下脂肪酸组成方面表现出明显的差异,这可能归因于它们在迁徙周期中的迁徙策略和觅食偏好。
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Blood Metabolites and Profiling Stored Adipose Tissue Reveal the Differential Migratory Strategies of Eurasian Reed and Sedge Warblers
The overall speed of bird migration is limited by the amount of fuel stores acquired during the initial phases of migration. The ability to mobilize fat is crucial for migratory birds that can exhibit different migratory strategies. Birds mobilize triglycerides during nocturnal flight thus increasing circulating fatty acids and glycerol to meet the metabolic demands of flight. Eurasian Reed (Acrocephalus scirpaceus) and Sedge (Acrocephalus schoenobaenus) Warblers were captured at Portuguese stopover sites during spring and autumn migration. These species were selected based on their different migration strategies and dietary preferences during migration. Blood metabolites and fat composition were analyzed to determine their nutritional states. Sedge Warblers had higher blood triglyceride and glycerol levels during post-flight fasting than in non-fasting periods. Furthermore, Sedge Warblers had higher triglyceride and glycerol levels than Eurasian Reed Warblers in both post-flight fasting and non-fasting condition. The differences found may reflect distinct approaches in re-feeding activity (e.g., feeding intensely) associated with the number of stopovers during migratory cycle. Dietary preferences affect the fat composition available for oxidation during long-term exercise in migratory flight. Nuclear magnetic resonance analysis of subcutaneous fat composition revealed that Sedge Warblers presented higher levels of polyunsaturated fatty acid levels than Eurasian Reed Warblers. The distinct lipidic profiles observed and differences in feeding ecology may explain the different migration strategies of these species. Overall and despite their ecological similarity, our study species showed pronounced differences in blood metabolites levels and subcutaneous fatty acids composition, likely attributed to the migratory strategy and foraging preferences during their migratory cycle.
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Western Birds
Western Birds Agricultural and Biological Sciences-Animal Science and Zoology
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