Testing hypotheses of adaptive variation in cricket ovipositor lengths

Area of Science:

• Evolutionary Biology
• Behavioral Ecology
• Entomology

Background:

• Ovipositor length in crickets is hypothesized to be an adaptation for protecting eggs.
• Egg burial depth is thought to shield eggs from environmental stressors like desiccation and cold.

Purpose of the Study:

• To experimentally test hypotheses on the evolution of cricket ovipositor length.
• To determine the effect of egg burial depth on overwinter survival and hatchling success.

Main Methods:

• Experimental testing of oviposition depth effects on egg survival in three Nemobiinae cricket species.
• Correlation analysis of hatchling emergence probability, survival, and body size with burial depth.
• Investigation of behavioral plasticity in oviposition depth in response to environmental conditions.

Main Results:

• No significant effect of burial depth on overwinter egg survival was found for the studied species.
• Increased burial depth negatively correlated with hatchling emergence probability, indicating a survival cost.
• Hatchling survival in soil was correlated with body size, potentially constraining fecundity trade-offs.

Conclusions:

• Egg burial depth does not appear to be a primary driver for overwinter survival in these Nemobiinae crickets.
• Hatchling survival in soil, influenced by depth and body size, may be a significant selective pressure on ovipositor length.
• Behavioral plasticity in oviposition depth allows some species to adapt to selection when morphological constraints exist.