TEMPERATURE CHARACTERISTIC FOR HEART RHYTHM OF THE SILKWORM.

Area of Science:

• Physiology
• Zoology
• Biophysics

Background:

• Heart rate is a key physiological indicator in insects.
• Understanding thermal physiology is crucial for insect biology and ecology.
• Arthropod activity is often limited by metabolic temperature sensitivity.

Purpose of the Study:

• To determine the critical thermal increment (CTrI) for heart rate in mature silkworms.
• To compare the CTrI of silkworm heart rate with other arthropod activities.

Main Methods:

• Experimental determination of the thermal increment for heart rate.
• Quantitative comparison with existing data for arthropod activities.

Main Results:

• The critical thermal increment for silkworm heart rate was calculated to be 12,200 calories.
• This value shows quantitative agreement with thermal increments in other arthropod activities.

Conclusions:

• Nervous system activity, specifically central nervous discharge rate, likely controls heart rate in silkworms.
• The findings support a unified model for thermal regulation of physiological processes in arthropods.