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- W1964068051 abstract "We examined plasma concentrations of corticosterone (CORT) and testosterone in male free-living and captive spotted salamanders, Ambystoma maculatum (Shaw, 1802), to determine if (i) they mounted significant CORT responses to conspecifics in captive enclosures during potential competition for limited burrows; (ii) artificially induced, increased breeding densities altered CORT and testosterone levels in a free-living population; and (iii) testosterone in free-living males varied seasonally. We found increased baseline CORT in captive male spotted salamanders exposed to conspecifics under high densities (4 animals with only 1 burrow). Original residents of the cage, however, had significantly higher baseline CORT titers than did newly introduced animals, and titers were significantly higher in animals cohabiting a burrow than those remaining outside the burrow. This suggests that spotted salamanders perceive con specifics as threats for burrows and become stressed when forced to share these resources. In contrast, free-living spotted salamanders during breeding showed no significant increases in baseline CORT or testosterone in high-density treatments. This suggests that increased adult density during breeding is not stressful to these salamanders. Finally, spotted salamanders had greater plasma testosterone titers in fall than in spring, suggesting that they are dissociated breeders." @default.
- W1964068051 created "2016-06-24" @default.
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- W1964068051 date "2004-11-01" @default.
- W1964068051 modified "2023-09-24" @default.
- W1964068051 title "The effects of terrestrial and breeding densities on corticosterone and testosterone levels in spotted salamanders, <i>Ambystoma maculatum</i>" @default.
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- W1964068051 doi "https://doi.org/10.1139/z04-150" @default.
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