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Comparative progesterone concentrations in two Peromyscus species.

F E Bell, W D Dawson

    Comparative Biochemistry and Physiology. B, Comparative Biochemistry
    |January 1, 1983
    PubMed
    Summary
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    Oldfield mice (Peromyscus polionotus) exhibit higher progesterone levels than deermice (P. maniculatus). Hybrid pregnancies in oldfield mice result in lower progesterone, potentially causing reproductive failure and acting as an isolating mechanism.

    Area of Science:

    • Reproductive biology
    • Endocrinology
    • Mammalian reproduction

    Background:

    • Plasma progesterone is crucial for maintaining pregnancy in mammals.
    • Interspecific hybridization often leads to reproductive barriers between species.

    Purpose of the Study:

    • To compare plasma progesterone concentrations between Peromyscus polionotus and Peromyscus maniculatus.
    • To investigate the effect of interspecific hybridization on progesterone levels in P. polionotus.

    Main Methods:

    • Radioimmunoassay (RIA) was used to measure plasma progesterone.
    • Progesterone levels were assessed in P. polionotus and P. maniculatus at estrus and during pregnancy.
    • P. polionotus females were examined with both conspecific and hybrid conceptuses.

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    Main Results:

    • P. polionotus demonstrated significantly higher progesterone levels than P. maniculatus at estrus and during gestation.
    • Females carrying interspecific hybrid fetuses showed markedly reduced progesterone levels compared to those with conspecific fetuses.
    • This reduction in progesterone in hybrid pregnancies was significant.

    Conclusions:

    • The observed endocrine difference in progesterone levels may explain reproductive failure in P. polionotus x P. maniculatus crosses.
    • Progesterone level differences could represent an incipient reproductive isolating mechanism between these species.
    • Hormonal disparities play a role in reproductive isolation.