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Butterfly flight activity affects reproductive performance and longevity relative to landscape structure
1Behavioural Ecology and Conservation Group, Biodiversity Research Centre, Université Catholique de Louvain (UCL), Croix du Sud 4-5, 1348, Louvain-la-Neuve, Belgium.
Oecologia
|April 8, 2010
Summary
Increased flight in fragmented landscapes impacts butterfly reproduction and longevity. Woodland butterflies show reduced lifespan and smaller egg size due to flight costs, highlighting landscape effects on life history traits.
Area of Science:
- Ecology
- Evolutionary Biology
- Animal Physiology
Background:
- Habitat fragmentation forces species to disperse more, potentially creating physiological trade-offs.
- Resource overlap exists between flight muscles and egg production in female insects.
- The speckled wood butterfly (Pararge aegeria) is a model species for studying landscape impacts on life history.
Purpose of the Study:
- To investigate the physiological trade-offs between flight and reproduction in speckled wood butterflies.
- To determine if landscape structure (woodland vs. fragmented agricultural) influences these trade-offs.
- To assess the impact of increased flight on egg size, fecundity, and longevity.
Main Methods:
- A common garden experiment was conducted with female Pararge aegeria from two distinct landscape types.
- A flight treatment was applied to simulate increased dispersal demands.
- Reproductive output (egg size, fecundity) and longevity were measured.
Main Results:
- Increased flight significantly reduced egg size, indicating a trade-off in resource allocation.
- Flight had no effect on daily fecundity but did impact egg provisioning.
- A landscape-specific effect on longevity was observed: flight reduced lifespan by 21% in woodland females but not in agricultural females.
Conclusions:
- Energetic costs of increased flight due to landscape fragmentation negatively affect reproductive resource allocation (egg size).
- Woodland butterflies exhibit landscape-specific trade-offs, reallocating resources from somatic maintenance to flight, thus reducing longevity.
- Changes in landscape structure can significantly impact crucial life history traits like reproduction and survival in insects.
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