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首页> 外文期刊>Marine biology >Influence of ontogeny on stable isotope ratios and trophic discrimination factors of African penguin (Spheniscus demersus) tissues
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Influence of ontogeny on stable isotope ratios and trophic discrimination factors of African penguin (Spheniscus demersus) tissues

机译：组织发生对非洲企鹅（Spheniscus Demersuss）组织稳定同位素比和营养鉴别因子的影响

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摘要

Stable isotopes are widely used in ecosystem studies to decipher trophic relationships between species. Using stable isotopes as trophic markers requires knowledge of the stable isotope ratios of consumer and putative prey, and of trophic discrimination factors (TDFs), the difference between the stable isotope ratios of predator and prey. TDFs differ among species, tissue sampled and the consumer's physiological state. We tested whether consumer ontogeny also influences its stable isotope ratios by measuring the delta C-13 and delta N-15 values, and their associated TDFs, of African penguin (Spheniscus demersus) blood components (whole blood, red blood cells, plasma) among four age classes (chicks, fledglings, juveniles and adults). Blood was sampled from captive penguins concurrently with their diet. Ontogenetic effects on TDFs were complex, depending on the blood component and isotope considered. Blood components differed in their sensitivity to consumer physiology, but TDFs for both carbon and nitrogen were generally lower for the younger age classes. Age class influenced the stable isotope compositions of whole blood and red blood cells with chicks and fledglings exhibiting significantly lower delta C-13 and delta N-15 values than juveniles and adults. Plasma showed no effect of ontogeny. The results indicate age class affects stable isotope ratios and TDFs through ontogenetic changes in physiology. Therefore, when uncertainty concerning TDFs exists in studies of wild animals, stable isotope analysis should preferably be combined with other dietary techniques.
机译：稳定的同位素广泛用于生态系统研究中，以破译物种之间的营养关系。使用稳定的同位素作为营养标记需要了解消费者和推定​​猎物的稳定同位素比，以及营养鉴别因子（TDFS），捕食者和猎物稳定同位素比的差异。 TDF在物种，组织采样和消费者的生理状态下不同。我们测试了消费者的组织生成也通过测量ΔC-13和δn-15值，以及它们相关的TDF，以及非洲企鹅（Spheniscus Demersus）血液成分（全血，红细胞，血浆）之间的相关TDF来影响其稳定的同位素比四个年龄课程（小鸡，漂浮，青少年和成人）。血液与饮食同时从俘虏的企鹅中取样。根据考虑的血液成分和同位素，对TDFS对TDFS的植入作用是复杂的。血液组分对消费者生理学的敏感性不同，但碳和氮的TDF通常较年轻的年龄阶级。年龄阶级影响了全血和红细胞的稳定同位素组成，雏鸡和漂浮凝集表现出明显低于少年和成人的Delta C-13和Delta N-15值。血浆显示出Ontogeny的影响。结果表明，通过生理学的髓质变化，年龄类别影响稳定的同位素比和TDF。因此，当野生动物的研究中存在有关TDF的不确定性时，稳定的同位素分析应优选与其他膳食技术合并。

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  • 来源
    《Marine biology》 |2021年第7期|96.1-96.12|共12页
  • 作者

    Micklem I. A.; Connan M.; Stander N.; McQuaid C. D.;

  • 作者单位

    Rhodes Univ Dept Zool & Entomol Grahamstown South Africa;

    Nelson Mandela Univ Inst Coastal & Marine Res Marine Apex Predator Res Unit Dept Zool Port Elizabeth South Africa;

    South African Fdn Conservat Coastal Birds Cape Town South Africa;

    Rhodes Univ Dept Zool & Entomol Grahamstown South Africa;

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