It's not all black and white: Investigating colour polymorphism in manta rays across Indo-Pacific populations

Stephanie K. Venables, Andrea D. Marshall, Elitza S. Germanov, Robert J.Y. Perryman, Ricardo F. Tapilatu, I. Gede Hendrawan, Anna L. Flam, Mike Van Keulen, Joseph L. Tomkins, W. Jason Kennington

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Intraspecific colour polymorphisms have been the focus of numerous studies, yet processes affecting melanism in the marine environment remain poorly understood. Arguably, the most prominent example of melanism in marine species occurs in manta rays (Mobula birostris and Mobula alfredi). Here, we use long-term photo identification catalogues to document the frequency variation of melanism across Indo-Pacific manta ray populations and test for evidence of selection by predation acting on colour morph variants. We use mark-recapture modelling to compare survivorship of typical and melanistic colour morphs in three M. alfredi populations and assess the relationship between frequency variation and geographical distance. While there were large differences in melanism frequencies among populations of both species (0-40.70%), apparent survival estimates revealed no difference in survivorship between colour morphs. We found a significant association between phenotypic and geographical distance in M. birostris, but not in M. alfredi. Our results suggest that melanism is not under selection by predation in the tested M. alfredi populations, and that frequency differences across populations of both species are a consequence of neutral genetic processes. As genetic colour polymorphisms are often subjected to complex selection mechanisms, our findings only begin to elucidate the underlying evolutionary processes responsible for the maintenance and frequency variation of melanism in manta ray populations.

Original languageEnglish
Article number20191879
JournalProceedings of the Royal Society B: Biological Sciences
Issue number1912
Publication statusPublished - 1 Jan 2019


Dive into the research topics of 'It's not all black and white: Investigating colour polymorphism in manta rays across Indo-Pacific populations'. Together they form a unique fingerprint.

Cite this