5 Works

Data from: Mobulid rays feed on euphausiids in the Bohol Sea

Christoph A. Rohner, Katherine B. Burgess, Joshua M. Rambahiniarison, Joshua D. Stewart, Alessandro Ponzo & Anthony J. Richardson
Mobulid rays have a conservative life history and are caught in direct fisheries and as by-catch. Their subsequent vulnerability to overexploitation has recently been recognized, but fisheries management can be ineffective if it ignores habitat and prey preferences and other trophic interactions of the target species. Here, we assessed the feeding ecology of four mobulids (Manta birostris, Mobula tarapacana, M. japanica, M. thurstoni) in the Bohol Sea, Philippines, using stomach contents analysis of fisheries specimens...

Data from: It’s not all black and white: investigating colour polymorphism in manta rays across Indo-Pacific populations

Stephanie Venables, Andrea Marshall, Elitza Germanov, Robert Perryman, Ricardo Tapilatu, I. Gede Hendrawan, Anna Flam, Mike Van Keulen, Joseph Tomkins & Jason Kennington
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 M. alfredi). Here, we use 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 modeling...

Genome-wide SNPs detect no evidence of genetic population structure for reef manta rays (Mobula alfredi) in southern Mozambique

Stephanie Venables, Andrea Marshall, Amelia Armstrong, Joseph Tomkins & Jason Kennington
Little is known about the extent of genetic connectivity along continuous coastlines in manta rays or whether site visitation is influenced by relatedness. Such information is pertinent to defining population boundaries and understanding localised dispersal patterns and behaviour. Here, we use 3057 genome-wide single nucleotide polymorphisms (SNPs) to evaluate population genetic structure and assess levels of relatedness at aggregation sites of reef manta rays (Mobula alfredi) in southern Mozambique (n = 114). Contrary to indications...

Data from: Genetic structure of populations of whale sharks among ocean basins and evidence for their historic rise and recent decline

Thomas M. Vignaud, Jeffrey A. Maynard, Raphael Leblois, Mark G. Meekan, Ricardo Vázquez-Juárez, Dení Ramírez-Macías, Simon J. Pierce, David Rowat, Michael L. Berumen, Champak Beeravolu, Sandra Baksay & Serge Planes
This study presents genetic evidence that whale sharks, Rhincodon typus, are comprised of at least two populations that rarely mix and is the first to document a population expansion. Relatively high genetic structure is found when comparing sharks from the Gulf of Mexico with sharks from the Indo-Pacific. If mixing occurs between the Indian and Atlantic Oceans, it is not sufficient to counter genetic drift. This suggests whale sharks are not all part of a...

Data from: Life history, growth, and reproductive biology of four mobulid species in the Bohol Sea, Philippines

Joshua M. Rambahiniarison, Mary Jane Lamoste, Christoph A. Rohner, Ryan Murray, Sally Snow, Jessica Labaja, Gonzalo Araujo & Alessandro Ponzo
This study focuses on female life-history parameters and reproductive cycles for four mobulid rays (Mobula thurstoni, Mo. japanica, Mo. tarapacana, and Manta birostris) caught in a targeted fishery in the Philippines. We collected size and reproductive data from 1,510 specimens (30% of catch) landed in two seasons in 2015 and 2016. Sexual maturity was assessed by visual examination of 1,034 specimens, to determine size-at-maturity and size-at-pregnancy. Females of all species matured at a larger size...

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Affiliations

  • Marine Megafauna Foundation
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  • University of Queensland
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