Daily Temperature Cycle Induces Daily Hatching Rhythm in Eastern Lubber Grasshoppers, Romalea microptera

In nature, Eastern Lubber Grasshoppers, Romalea microptera, tend to hatch in the morning, thus exhibiting a daily hatching rhythm. They also show high intra-pod hatching synchrony. We tested the hypotheses that both diel-hatching rhythmicity and intra-pod hatching synchrony are elicited by a daily t...

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Bibliographic Details
Published in:Journal of orthoptera research 2013-01, Vol.22 (1), p.51-55
Main Authors: Smith, Amanda R, Nowak, Ashley, Wagner, Patrick, Yates, Rebekah, Janci, Elise, Bernales, Ryan, Dietz, Taelor, Earhart, Alex, Fogle, Ariel, Fullerton, Nigel, Gromer, Kyle, Kliver, Brien, Larson, Will, Ludwikowski, Jessica, Martini, Tony, Mcgrath, Joe, Polino, Alex, Schumacher, Molly, Weick, Shannon, Casto, Joseph M, Whitman, Doug W
Format: Article
Language:English
Subjects:
Biological rhythms
circadian rhythm
daily rhythm
egg hatch
Egg masses
Eggs
Entomology
Environmental aspects
grasshopper
Grasshoppers
Hatching
Insect behavior
Insect eggs
Insect physiology
Low temperature
Orthoptera
Physiological aspects
Soil temperature regimes
threshold temperature
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Summary:In nature, Eastern Lubber Grasshoppers, Romalea microptera, tend to hatch in the morning, thus exhibiting a daily hatching rhythm. They also show high intra-pod hatching synchrony. We tested the hypotheses that both diel-hatching rhythmicity and intra-pod hatching synchrony are elicited by a daily temperature cycle. In the laboratory, we exposed egg pods to either a daily 15:26 °C temperature cycle (12 h at each temperature) or a constant 26 °C temperature regimen. Under the daily temperature cycle, hatching was strongly rhythmic, with peak hatching at 3 h after the beginning of the warm phase. Under the constant temperature, hatching rhythmicity was greatly reduced and eggs hatched throughout the 24-h period. There was little intra-pod hatching synchrony under either treatment. We propose that in nature both daily hatching rhythm and intra-pod hatching synchrony are controlled by a thermal threshold for hatching.
ISSN:1082-6467
1937-2426
DOI:10.1665/034.022.0108