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Differing Host Exploitation Efficiencies in Two Hyperparasitoids: When is a 'Match Made in Heaven'?

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|July 19, 2011

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Lysibia nana, a parasitoid wasp, efficiently exploits Cotesia glomerata cocoons due to its reproductive biology, indicating co-evolution. Gelis agilis, another parasitoid, is less efficient, suggesting it is a generalist species.

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Area of Science:

Ecology
Evolutionary Biology
Entomology

Background:

Hyperparasitoids are crucial in regulating primary parasitoid populations.
Understanding host exploitation strategies is key to insect pest management.
Lysibia nana and Gelis agilis are hyperparasitoids of Cotesia glomerata.

Purpose of the Study:

To compare the host exploitation behavior of Lysibia nana and Gelis agilis on Cotesia glomerata cocoons.
To investigate the influence of reproductive traits on hyperparasitoid efficiency.
To infer co-evolutionary relationships based on host exploitation patterns.

Main Methods:

Experimental exposure of individual hyperparasitoid females (L. nana and G. agilis) of varying ages and physiological states to single cocoon clusters of C. glomerata.
Cocoons of C. glomerata were varied in age.
Observed and quantified host exploitation success.

Main Results:

Lysibia nana demonstrated high efficiency in exploiting C. glomerata cocoons, aligning with its reproductive biology (sexual reproduction, rapid egg maturation, no host-feeding).
Gelis agilis exhibited significantly lower efficiency in exploiting C. glomerata cocoons.
The reproductive traits of L. nana are well-suited for exploiting C. glomerata broods, suggesting co-evolution.

Conclusions:

Lysibia nana's specialized traits suggest a strong co-evolutionary history with Cotesia glomerata.
Gelis agilis's lower efficiency indicates it may be a generalist species with broader host range.
The findings highlight how reproductive strategies influence host-parasitoid dynamics and specialization.