AI Article Synopsis
- Multiple paternity has been confirmed in a variety of shark species, including oceanic sharks, indicating diverse reproductive strategies.
- In a study on shortfin mako sharks, an average of 4.6 sires per litter was identified, although different software showed varying results (2.5 sires using GERUD).
- These findings suggest that multiple paternity may be prevalent in shortfin mako sharks and should be incorporated into population studies for better projections and risk assessments.
Article Abstract
Multiple paternity has been demonstrated in a variety of sharks with different reproductive modes (, viviparous, ovoviviparous, adelphophagy, oviparous), although the number of sires per litter varies considerably among species. To date, such analyses have focused mainly on coastal and nearshore shark species due to the difficulty in sampling oceanic sharks. In the present study, we observed multiple paternity in the oceanic shark from seven polymorphic microsatellite loci and three litters collected from Nanfangao Fishing Port. Paternity tests showed that an average of 4.6 sires were assigned to each litter of using COLONY software, and that the average number of sires dropped to 2.5 when using GERUD. These findings suggest that multiple paternity could be a common reproductive strategy used by the shortfin mako shark, and that this mating system should be integrated into a demographic model to make more accurate population projections and risk analyses in the future.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7736774 | PMC |
| http://dx.doi.org/10.6620/ZS.2020.59-49 | DOI Listing |
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