Heat production by adult Cryptolestes ferrugineus (Stephens) of different ages and densities
R. Cofie-Agblor, W. E. Muir, R. N. Sinha and P. G. Fields
Postharvest Biology and Technology Vol: 7 Issue: 4 Pages: 371-380
1996
บทคัดย่อ
The heat of respiration of adult Cryptolestes ferrugineus at three
ages (one, four, and eight weeks old) at 2500 insects/200 g of wheat and three
population densities (1250, 2500, and 5000 insects/200 g of wheat) with
four-week old insects was measured in a computer-controlled, adiabatic
respiratory calorimeter at three initial grain temperatures (15, 25, and 35°C)
and three moisture contents (MCs) [12, 15, and 18% wet basis (WB)]. Age,
density, temperature, and MC significantly affected heat production (P
< 0.001). Heat production rates increased with both increasing initial grain
temperature and moisture content. Heat production by age was highest in
four-week old adults (9.41 
W/insect),
whereas that of eight-week old adults (7.81 W/insect)
was slightly higher than for adults one week old (7.40 W/insect).
Heat production per insect by density was highest at 2500 insects/200 g of
wheat (9.41 W/insect)
and lowest at 5000 insects/200 g of wheat (6.38 W/insect).
Instantaneous rates of heat production measured over the test period were
affected by the combination of age, density, moisture content, and temperature
increase.