Figure 1.
Diagram of the enriched treatment condition, showing the home cage and the connected enriched compartment.
Two movable ramps could be raised (as shown in the enriched compartment in the figure) or lowered (as shown in the home cage in the figure) by a chain mechanism, in order to control access to the enriched compartment.
Figure 2.
Diagram of the mate choice apparatus.
Figure 3.
Location of landmarks on the labial side of the mandible.
Figure 4.
a) baculum with a well-developed proximal process (mean score = 30.2), and b) baculum with an under-developed proximal process (mean score = 1.8). Arrow indicates the proximal process. Scale = 1cm.
Table 1.
Effects of environmental enrichment on reproductive variables (see text for effects of enrichment on likelihood of producing progeny).
Table 2.
Effects of environmental enrichment on male phenotype.
Figure 5.
Relationship between locomotory stereotypies and number of copulations.
Graph from Analysis 2. “†” indicates the one pair in which the NE male stereotyped (during two trials).
Table 3.
Relationships between enrichment-affected male traits and male mating success.