. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TEMPERATURE OF A KATYDID 277 29° C. The lowest thoracic temperature at which singing began was ° C, which occurred at ambient temperatures of ° C and ° C. During singing thoracic temperature rises by about 1° C, reaching an average temperature of ° C ( ; N -- 30). The maximum thoracic tempera- ture during singing increases with increasing ambient temperature. A linear regression fitted to data collected in the laboratory had a slope (thoracic tempera- ture/ambient temperature) of ° C/°C over the t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TEMPERATURE OF A KATYDID 277 29° C. The lowest thoracic temperature at which singing began was ° C, which occurred at ambient temperatures of ° C and ° C. During singing thoracic temperature rises by about 1° C, reaching an average temperature of ° C ( ; N -- 30). The maximum thoracic tempera- ture during singing increases with increasing ambient temperature. A linear regression fitted to data collected in the laboratory had a slope (thoracic tempera- ture/ambient temperature) of ° C/°C over the temperature range ° C (Fig. 4). Katydids can sing at lower air temperatures in the field. Tempera- tures of katydids singing at air temperature of ° C-22° C in the field are also shown in Figure 4. The linear regression fitted to the laboratory data seems to fit the field measurements. This katydid may be unable to sing at thoracic temperatures below about 28° C. Singing period. Neoconocephalus robiistus sings readily in the laboratory for a period of up to an hour even when implanted. In the field this katydid sings continuously for extended periods. Table I shows the characteristics of the song recorded during several evenings near Falmouth, Massachusetts in August, 1968. On subsequent evenings we found N. robiistus singing at air temperatures as low as ° C and also as late as 10:00 PM (EST). N. robustus Falmouth, Mass. Ambient Temperature °C FIGURE 4. Thoracic temperature of singing katydids plotted against air temperature at the time of singing. A linear regression fitted to points from animals measured in the laboratory, fits field measurements, O, equally Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biolog
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