{"id":612,"date":"2024-01-25T13:44:39","date_gmt":"2024-01-25T13:44:39","guid":{"rendered":"https:\/\/saveourseas.com\/sosf-shark-research-center\/?p=612"},"modified":"2024-04-04T02:29:02","modified_gmt":"2024-04-04T01:29:02","slug":"the-oceans-between-us","status":"publish","type":"post","link":"https:\/\/saveourseas.com\/sosf-shark-research-center\/the-oceans-between-us\/","title":{"rendered":"The oceans between us"},"content":{"rendered":"

There are oceans between us: genetics uncover structure and diversity in wide-ranging oceanic whitetip shark populations<\/h2>\n

Imagine a shark that was once so plentiful that it found infamy among torpedoed war-time sailors and downed pilots. And now visualise that same shark as one of the ocean\u2019s rarest; a Critically Endangered species whose global population has crashed by 98% since the 1950s. Scientists are scrambling to save the oceanic whitetip shark, an important open-ocean predator whose nomadic ways have kept us in the dark about their real population structure and genetic diversity. But a new scientific paper, \u2018Cross ocean-basin population genetic dynamics in a pelagic top predator of high conservation concern, the oceanic whitetip shark, Carcharhinus longimanus<\/em>, published<\/a> in the journal Conservation Genetics<\/em>\u00a0this month, turns what we thought about the passport-defying ways of big, mobile sharks on its head.<\/p>\n

\u2018This is the first study on the\u00a0global-scale\u00a0genetics of this species and the first to use nuclear markers to assess population and genetic diversity,\u2019 says Professor Mahmood Shivji, director of the Save Our Seas Foundation Shark Research Center (SOSF-SRC) and Guy Harvey Research Institute, Nova Southeastern University. Professor Shivji and his team have discovered that the oceanic whitetip population is not a single genetically homogenous unit that moves across the planet\u2019s oceans with individuals interbreeding. Instead, oceanic whitetip sharks in the Atlantic Ocean are genetically distinct from oceanic whitetip sharks in the Indo-Pacific region.<\/p>\n

The team\u2019s study is the first to investigate the worldwide connectivity and genetic diversity of the species. The finding that there are more than one global genetic population comes from using both nuclear (inherited from both parents) and mitochondrial (inherited from the mother only) genetic markers. \u2018So we know that at least<\/em>\u00a0two clearly different populations exist in this species, indicating that they are largely genetically isolated from one another, even though these sharks can swim long distances and theoretically interbreed (but in practice they don\u2019t),\u2019 explains Professor Shivji.<\/p>\n

\u2018From a conservation perspective, maintaining different gene pools (genetic diversity) within a species is a major goal because genetic diversity is critical for species and populations to maintain their adaptability, fitness and resilience to a rapidly changing ocean environment.\u2019<\/div>\n
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Artwork by Jamy Silver | \u00a9 Save Our Seas Foundation<\/p><\/div>\n

A population in peril<\/h2>\n

Resilience is a requirement for the oceanic whitetip shark. Like an underwater Memphis Belle B-52 bomber, the oceanic whitetip moves through the deep waters offshore, using its iconic white-tipped, paddle-shaped pectoral fins and dorsal fin. In fact, it is these very fins that have got the \u2018Lord of the Long Arms\u2019 (as Jacques Cousteau famously dubbed this shark) into trouble. The species is taken as bycatch in many purse-seine, pelagic longline and gill-net fisheries targeting tuna, and it has been directly targeted for its fins in the international trade. Oceanic whitetips are further used for their meat, liver oil and skin.<\/p>\n

Considered a top predator that prefers the upper water column (from the surface to a depth of about 200 metres; 650 feet) in offshore tropical and subtropical oceans worldwide, the oceanic whitetip shark is undoubtedly an important piece in a complex ecological puzzle. Based on calculations that the species has declined by more than 80% over three generations, the International Union for the Conservation of Nature (IUCN) has categorised this species as Critically Endangered on its Red List of Threatened Species.<\/p>\n

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Photo \u00a9 Christopher Vaughan-Jones<\/p><\/div>\n

They got it from their mothers?<\/h2>\n

Professor Shivji, together with Cassandra Ruck (lead author on the paper), Rima Jabado and Andrea Bernard, found significant differences in both the nuclear and mitochondrial DNA of oceanic whitetip sharks from the Atlantic and Indo-Pacific oceans. The nuclear DNA differences help to tell us that although large-bodied, wide-ranging sharks in theory can move across the oceans and interbreed, in practice they don\u2019t.<\/p>\n

\u2018Even though each species originated in one place,\u2019 explains Professor Shivji, \u2018in the marine realm, many shark species subsequently spread from their place of origin to colonise other oceans. Examples are tiger, oceanic whitetip, blue, white and shortfin mako sharks, as well as great hammerheads.\u2019 Indeed, the team at the SOSF-SRC previously published their findings that tiger sharks, although broadly distributed across the oceans and capable of making incredible ocean-scale journeys, have developed genetically distinct subpopulations in the Atlantic and Indo-Pacific oceans. \u2018Since they spread out,\u2019 continues Professor Shivji, \u2018there have been changes in ocean currents, temperatures and behaviour that have prevented the globally spread-out individuals within a species from continuing to mix and interbreed, and so genetically different populations have evolved.\u2019<\/p>\n

But the mitochondrial DNA adds even more nuance to the discovery, because this form of DNA can only be inherited through the maternal line and therefore tells us something about where these sharks are born. \u2018There are at least two clear matrilineal genetic populations within the Atlantic Ocean: the eastern Atlantic and western Atlantic,\u2019 explains Professor Shivji. There is, the scientists say, potentially evidence of even more matrilineal populations within the western Atlantic, but this needs to be confirmed with additional samples and markers.<\/p>\n

The idea is that female philopatry (where female sharks reliably return to their birthplace to give birth to their own pups) and ocean currents have acted as natural barriers to genetic mixing; indeed, shark behaviours like site fidelity and natal philopatry, oceanography (ocean temperatures and currents) and biology (the availability of prey and the distribution of different essential shark habitats) may be what is further dividing these shark populations within ocean basins.<\/p>\n

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Photo \u00a9 Christopher Vaughan-Jones<\/p><\/div>\n

(Micro)management: why genetics helps us change the way we manage sharks<\/h2>\n

It has been the predominant school of thought that wide-ranging, large-bodied sharks can and do move freely across the oceans, mixing and breeding \u2013 and their populations tend to have been managed as such. But we now know that although the oceans seem borderless to us, these three-dimensional environments offer all manner of differences for sharks to choose where they associate, or they act as natural barriers to the sharks\u2019 movements. Fisheries management can now, for instance, consider the genetic distinctiveness of the Atlantic and Indo-Pacific populations of oceanic whitetip sharks. \u2018Genetically different populations first need to be identified,\u2019 elaborates Professor Shivji, \u2018so that management strategies can be refined to conserve each population.\u2019 Tailoring strategies to each population is vital when a species is Critically Endangered and considered under urgent threat.<\/p>\n

But there is some good news, it seems, for oceanic whitetip sharks. There is no doubt that they are in big trouble, but the scientists were also able to show that this species has medium to high levels of genetic diversity. This will stand it in good stead as the climate changes and seas become increasingly polluted, diseased and fragmented. \u2018This is good news,\u2019 says Professor Shivji, \u2018since many other species that have experienced rapid, large reductions in their numbers have often also shown a large decline in their genetic diversity.\u2019 If suitable conservation measures are implemented quickly and effectively, the scientists say, this genetic diversity may enable the oceanic whitetip shark to adapt and stay resilient as the oceans change.<\/p>\n

And the changes affecting the oceans are rapid: overfishing, variations in sea surface temperatures and ocean chemistry, and the loss of coastal habitats all operate on timescales that outstrip the pace at which many species can adapt. Knowing how populations are structured genetically helps us to understand what their relative resilience might be in the face of change. A small, genetically isolated population must be managed very differently to one that is distributed around the world and across different habitats. The more we know about sharks, the better we are able to refine our own behaviour, policies and management interventions to accommodate their particular challenges. If our understanding of the oceanic whitetip shark had remained that its populations are similar wherever they are found, we might have stood to lose its true diversity and undermined its resilience in the face of grave threats.<\/p>\n

\"\"<\/a>

Photo \u00a9 Christopher Vaughan-Jones<\/p><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

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