Major histocompatibility complex class IIB disassortative mate choice in a genetically monogamous seabird

Area of Science:

• Evolutionary biology
• Behavioral ecology
• Immunogenetics

Background:

• Mating strategies are crucial for fitness in sexually reproducing species.
• The major histocompatibility complex (MHC) influences immune defense and pathogen resistance.
• Previous studies on MHC-based mate choice and its effect on offspring immunity have yielded mixed results.

Purpose of the Study:

• To investigate the association between major histocompatibility complex (MHC) class IIB dissimilarity and mate choice in black-legged kittiwakes (Rissa tridactyla).
• To examine the relationship between MHC dissimilarity and divorce probability in this species.

Main Methods:

• Analysis of MHC class IIB gene variation in breeding pairs of black-legged kittiwakes.
• Statistical comparison of observed MHC dissimilarity with random mating expectations.
• Assessment of divorce probability in relation to pair MHC dissimilarity.

Main Results:

• First-time and divorced male kittiwakes were paired with females exhibiting greater MHC class IIB dissimilarity than expected by chance.
• No significant evidence of MHC class IIB dissimilarity-driven mate choice was found in females.
• Divorce probability in the studied population was low and not significantly correlated with MHC class IIB dissimilarity.

Conclusions:

• MHC class IIB dissimilarity may play a role in initial mate selection for males in species with mutual mate choice and biparental care.
• The influence of MHC dissimilarity on mating decisions, including divorce, is complex and species-specific.
• Further research is needed to fully understand the role of MHC in diverse mating strategies.