Cindy wants to know if bonnethead sharks in the Eastern Pacific constitute a third, cryptic species. The Bonnethead complex need clarification in all its distribution range, and Panama is a key country to solve this question since we have the Caribbean sea and the Pacific Ocean. By collecting fin clip samples to compare species at the genetic level and collecting specimens to compare how they look (morphology), Cindy hopes to resolve the taxonomy of Sphyrna tiburo vespertina – that is, whether it’s a cryptic third species for bonnetheads in the region. Her information can help update the IUCN Red List for bonnetheads and improve fisheries policies in Latin America where bonnethead sharks are commonly caught.
From an early age I have been attracted to nature and the ocean and when I was little my dream was to be a veterinarian so that I could save animals. My parents felt a special connection with farmers and indigenous communities in Colombia and would show me how these people produce their own food and how they use local resources to trade goods. We spent holidays on the Caribbean coast of Colombia and I always felt that the ocean was my favourite place. These experiences shaped my way of perceiving the world. By the time I was 14 I...
To resolve the taxonomy and phylogeography of Sphyrna tiburo vespertina in the eastern Pacific by clarifying whether it constitutes a third cryptic species for the bonnethead shark species complex and to use the results as a baseline for fisheries management and conservation in Latin American countries.
Bonnethead sharks, a widespread component of local fisheries in Latin America, the USA and the Caribbean, are not actively managed for sustainability. In 2019 the IUCN reclassified S. tiburo as Endangered on its Red List of Threatened Species. No data have been recorded for this species in the eastern Pacific and it is not known whether the subspecies S. tiburo vespertina constitutes a third cryptic species for the bonnethead complex. It is essential to clarify the taxonomy and phylogeography of the cryptic populations of S. tiburo to ensure that their stocks are fished sustainably.
Identifying genetically distinct populations is a vital prerequisite to clarifying and understanding evolutionary processes such as cryptic speciation. This term refers to species complexes that have been classified as single species but may comprise two or more species that are morphologically similar but genetically different. When this distinction is not clear across the distribution range of these species’ complexes, there is a masking effect that could be hiding the actual status of the populations.
The bonnethead shark Sphyrna tiburo is a small coastal shark that occurs in the western Atlantic from North Carolina to southern Brazil and in the eastern Pacific from California to Ecuador. It is an important component of the fisheries within its range. An assessment conducted by the IUCN in 2019 found declines of 50–80% in its populations, resulting in the species’ listing as Endangered. Only in the USA and The Bahamas are the populations managed; in Brazil, Mexico and California they are reported to be regionally extinct or collapsed. Previous genetic studies based on mitochondrial markers showed evidence that bonnethead sharks are a species complex with at least two cryptic lineages – S. tiburo tiburo and S. aff. tiburo – in the western Atlantic and the Caribbean. Currently no studies have been conducted, and no data recorded, on the subspecies S. tiburo vespertina in the eastern Pacific, so its taxonomy and population structure are unresolved.
This study aims to clarify the phylogeography and population structure of the bonnethead shark complex in Panama, a key country that provides access to both the Pacific and the Caribbean coasts. I will address whether or not the subspecies S. tiburo vespertina from the eastern Pacific constitutes a third cryptic species in this complex. The information obtained will be used to create a baseline for the conservation initiatives for small hammerhead sharks in Latin America and the Caribbean.
Outside the USA, The Bahamas is the only place where Critically Endangered smalltooth sawfish can reliably be found. Tristan wants to ensure that protection measures in The Bahamas are understood and enforced as far as sawfish are concerned to close the current gap between policy and the people. He’ll be using aerial surveys, sonar and BRUVs, combined with interviews that draw on local knowledge, to identify essential sawfish habitats that need protection. Engaging with the community through workshops and by training students and meeting with government, Tristan intends to advocate for smalltooth sawfish protection throughout The Bahamas’ territorial waters.
Steven and Kevin are using genetic techniques to understand how Caribbean reef shark populations are connected across the extent of their range. Populations of this Endangered shark are in decline generally, but where they are managed and there is effective protection, their numbers are stable. With the integration of the correct information, Steven and Kevin are convinced that we can give Caribbean reef sharks a better shot at recovery and population stabilisation. They will also explore any barriers to connectivity, looking to the future recruitment and recovery of these sharks.
With very little information available about Endangered sicklefin devil rays, their seasonal aggregations at sea mounts in the Azores give Sophie an opportunity to learn more about their lives. She will be collecting satellite-tracking data that show how they move in the Azores’ exclusive economic zone. The information she collects will be used to develop maps of how the rays are using the zone and to identify essential areas that multiple species use. With this information at hand, Sophie hopes her work can contribute to a network of marine protected areas.