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In this condition both partners are expected to allocate as few resources as possible to the male function.
All remaining resources are expected to be devolved to egg production.
Although both Charnov (1982) and Parker (1998) refer to sperm competition as an evolutionary force that selects for adaptations at different levels (in anatomical, physiological, behavioral, and life history traits), studies rarely take into account anything more than gametic investment when testing for sex allocation models.
However, when reproductive competitors are present, investing in behaviors to compete with rivals can increase fitness returns.
Tan and others (2004) documented that in the leech sp., although in the latter a trade-off between sexual functions is revealed under specific conditions (Schärer and others 2005).