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Thermostatic capacity of nests body temperature and thermo regulation in the young of hemi synanthropic populations of turdus merula turdus philomelos and sylvia curruca

Thermostatic capacity of nests body temperature and thermo regulation in the young of hemi synanthropic populations of turdus merula turdus philomelos and sylvia curruca

Folia Zoologica 27(4): 337-348

The thermostatic capacity of nests, body temperature and thermoregulation were studied in the young of T. merula, T. philomelos and S. curruca. The thermostatic capacity of the nests was estimated according to a modified method by M. and P. Palmgren and temperatures were measured with a recorder EZ 4 with 4 resistor probes. T. merula and T. philomelos constructed nests with a high thermostatic capacity as compared with S. curruca. In 25 nests of T. merula, 25 nests of T. philomelos and 6 nests of S. curruca, the decrease in temperature of 250 cm3 of water from 40-39.degree. C ranged from 645-894 s (.hivin.x [mean] = 817 s), 705-830 s (.hivin.x = 760 s) and 345-411 s (.hivin.x = 380 s), respectively. Differences in the thermostatic capacity of nests resulted from differences in their composition and construction. T. merula and T. philomelos construct nests with thick walls with several layers, and with a high insulating capacity. S. curruca constructs nests with thin walls, thin plait and lower insulating capacity. Differences in the composition and construction of nests and in their thermostatic capacity result from the behavior of parents during the breeding period. Males of T. merula and T. philomelos do not participate in the incubation so that females must leave the nest regularly to feed themselves. Females of S. curruca are fed by males during the incubation, or when leaving the nest, are replaced by them for the necessary period. For that reason, T. merula and T. philomelos construct thermostatic nests with thick walls (differences in the thermostatic capacity are low), while S. curruca constructs thin-walled nests with a low thermostatic capacity (as compared with Turdus spp. the differences in the thermostatic capacity are high). Within the first 5 days of life, the body temperature of young of T. merula and T. philomelos fluctuated about 32.degree. C and by 8-9.degree. C lower than that of their parents. The thermoregulation of young was not developed. On the 8th day of life, the body temperature of young of the species investigated reached 37.degree. C and the thermoregulation was fully developed; this was associated with the development of plumage on the back of the young.

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