Changes in mitochondrial function parallel life history transitions between flight and reproduction in wing...

Area of Science:

• Evolutionary Biology
• Physiology
• Mitochondrial Biology

Background:

• Mitochondria are vital for energy and biosynthesis, influencing life history traits like reproduction and activity.
• Variation in mitochondrial function correlates with life history differences within and across species.
• Previous studies noted differences in mitochondrial capacity between long-winged (flight) and short-winged (fecundity) crickets.

Purpose of the Study:

• To investigate if differences in mitochondrial function related to life history are fixed or flexible throughout an organism's life cycle.
• To measure mitochondrial function in fat body tissue of crickets with alternative life histories during early adulthood.
• To understand the dynamic changes in mitochondrial function in relation to specific life history strategies.

Main Methods:

• Measured mitochondrial function, specifically oxidative phosphorylation capacity, in fat body tissue.
• Compared long-winged and short-winged crickets from two species (Gryllus firmus and Gryllus lineaticeps).
• Assessed changes in mitochondrial function across early adulthood and during the transition from flight muscle maintenance to oogenesis.

Main Results:

• Mitochondrial oxidative phosphorylation capacity increased in long-winged crickets' fat body during early adulthood, but not in short-winged crickets.
• In long-winged crickets, fat body mitochondrial oxidative phosphorylation capacity decreased rapidly as flight muscles degraded and oogenesis began.
• These findings suggest mitochondrial function is flexible and adapts to current and future life history demands.

Conclusions:

• Changes in mitochondrial bioenergetics are a dynamic component of alternative life histories.
• Tissue-specific functional constraints, particularly the flight-oogenesis trade-off, may be underpinned by concurrent shifts in mitochondrial function.
• Mitochondrial function is adaptable, aligning energy production with specific life history requirements.