Hogstad Olav, Pedersen Hans Chr
Norwegian University of Science and Technology, Section of Natural History, N-7491 Trondheim, Norway.
Environ Pollut. 2007 May;147(1):245-7. doi: 10.1016/j.envpol.2006.08.004. Epub 2006 Sep 29.
Possible links between plasma testosterone levels, heavy metal loads and dominance in juvenile male willow tits (Parus montanus) are studied during winter conditions in Norway. Dominant individuals have better access to food resources, significantly higher cadmium content in the liver and higher plasma testosterone level compared to subordinates. A positive correlation was also found between plasma testosterone level and content of cadmium in the liver. Although the results in our study shows only a limited difference in testosterone level of dominant and subordinate juvenile male willow tits, possible small changes in behaviour might have crucial effects on winter survival of these birds.
在挪威的冬季条件下，研究了雄性幼年柳莺（Parus montanus）血浆睾酮水平、重金属负荷与优势地位之间的潜在联系。与从属个体相比，优势个体能更好地获取食物资源，肝脏中的镉含量显著更高，血浆睾酮水平也更高。还发现血浆睾酮水平与肝脏中镉的含量呈正相关。尽管我们研究的结果显示，优势和从属雄性幼年柳莺的睾酮水平仅有有限差异，但行为上可能的微小变化可能对这些鸟类的冬季生存产生关键影响。
