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Arthropods life cycle and temperature: Beyond isomorphy hypothesis
Olivier Bonato1, Joel Chadoeuf2
1IRD, Cirad, Univ. Montpellier, UMR IPME, 911 Avenue Agropolis, 34394 Montpellier, France.
Journal of Thermal Biology
|July 19, 2018
Summary
Temperature influences poikilotherm development and lifespan. While isomorphy offers a general description, a power law model better characterizes the relationship between developmental time and adult lifespan in arthropods.
Area of Science:
- Zoology
- Ecology
- Evolutionary Biology
Background:
- Temperature significantly impacts developmental time and adult lifespan in poikilotherms, with distinct physiological mechanisms.
- The developmental theory of aging posits a positive correlation between development and lifespan, but lacks confirmed causality.
- The developmental rate isomorphy hypothesis suggests developmental stage durations are proportional regardless of temperature, implying evolutionary significance.
Purpose of the Study:
- To investigate if the developmental rate isomorphy hypothesis extends to the total lifespan, including adult lifespan, in temperature-dependent poikilotherms.
- To analyze the relationship between developmental time and adult lifespan in arthropods of agronomic interest.
Main Methods:
- Analysis of developmental time and adult lifespan data in arthropods relevant to agriculture.
- Testing the applicability of the developmental rate isomorphy hypothesis to total poikilotherm lifespan.
- Developing and evaluating a power law model to describe the relationship between developmental time and adult lifespan.
Main Results:
- Developmental rate isomorphy provides an acceptable global description of the relationship between developmental time and adult lifespan.
- A general power law model offers a more precise characterization of this relationship.
- Parameters within the power law model vary based on the functional type of the arthropod (phytophagous, predator, parasitoid).
Conclusions:
- The power law model is more appropriate than isomorphy for accurately describing the link between developmental time and adult lifespan in arthropods.
- This power law relationship is likely applicable to all arthropods, particularly those of agricultural importance.
- Understanding these relationships has implications for predicting insect population dynamics and developing pest management strategies.
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