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The Science of Nature - 相似文献
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W. Jost W. J. Schmidt Hans Stille Ferdinand Trendelenburg 《Die Naturwissenschaften》1939,27(27):471-472
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Anja Gladbach David Joachim Gladbach Martina Koch Alexandra Kuchar Erich Möstl Petra Quillfeldt 《Behavioral ecology and sociobiology》2011,65(7):1491-1498
The measurement of faecal glucocorticoid metabolites is used as a non-invasive technique to study stress in animal populations.
They have been used most widely in mammals, and mammalian studies have also treated issues such as sample stability and storage
methods. In birds, faecal corticosterone metabolite (CM) assays have been validated for a small number of species, and adequate
storage under field conditions has not been addressed explicitly in previous studies. Furthermore, while it is well-established
that baseline plasma corticosterone levels in birds rise with declining body condition, no study so far investigated if this
relationship is also reflected in faecal samples. We here present data of a field study in wild Upland geese Chloephaga picta leucoptera on the Falkland Islands, testing different storage methods and investigating the relationship of faecal CM concentrations
to body condition and reproductive parameters. We found that faecal CM measures are significantly repeatable within individuals,
higher in individuals with lower body condition in both male and female wild Upland geese and higher in later breeding females
with smaller broods. These results suggest that measuring faecal CM values may be a valuable non-invasive tool to monitor
the relative condition or health of individuals and populations, especially in areas where there still is intense hunting
practice. 相似文献
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Skelly JM Ferdinand JA Savage JE Jagodzinski JM Mulik JD 《Journal of the Air & Waste Management Association (1995)》2001,51(9):1280-1287
Ogawa passive O3 samplers were used in a 13-week study (June 1-September 1, 1999) involving 11 forested and mountaintop sites in north-central Pennsylvania. Four of the sites were collocated with TECO model 49 O3 analyzers. A significant correlation (p < 0.0001) was found for 24-hr average weekly O3 concentrations between the two methodologies at the four sites with collocated monitors. As expected, there were positive relationships between increasing elevation of the sites and increasing O3 concentrations. No O3 exposure patterns were found on a west-to-east or south-to-north basis; however, the area known for lower O3 exposures within a smaller subsection of the study area showed consistently lower O3 exposures. Preliminary results regarding relationships of symptom responses within O3-sensitive bioindicators are also presented with black cherry (Prunus serotina, Ehrh.) and common milkweed (Asclepias syriaca, L.) showing clear evidence of increasing injury with increasing O3 exposures. Due to the extremely dry conditions encountered in north-central Pennsylvania during the 1999 growing season, O3-induced symptoms were sporadic and quite delayed until late-season rains during the latter portion of the observation period. 相似文献
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