Evaluación de las áreas de cría del tiburón martillo de aletas festoneadas (Sphyrna lewini) en el Pacifico Tropical Oriental mediante un enfoque de isótopos estables

Tiburón martillo. Fotografía: Alex Hearn.

El tiburón martillo (Sphyrna lewini), también conocido como tiburón martillo de aletas festoneadas, es una de las especies marinas más icónicas en el Pacífico Tropical Oriental (PTO), sin embargo, todavía se sabe poco sobre su biología reproductiva y el origen de sus áreas de cría, a pesar de la continua disminución global de sus poblaciones. Comprender el origen de las áreas de cría de tiburones es una tarea compleja; sin embargo, se sabe que la obtención de recursos en las primeras etapas de vida de los tiburones placentarios ocurre a través de la reminiscencia materna, por lo que es posible inferir el origen de la energía que los neonatos acumulan durante su gestación. En este estudio evaluamos la conectividad ecológica y el uso de áreas de cría mediante un análisis de isótopos estables de carbono (δ13C) y nitrógeno (δ15N) en muestras de piel de neonatos de S. lewini en gran parte de su distribución en el PTO, incluida la Reserva Marina de Galápagos (RMG). Nuestros modelos de mezcla isotópica revelaron que los neonatos de S. lewini encontrados en la RMG tienen información isotópica similar a las hembras adultas que habitan en el archipiélago de Galápagos, lo que sugiere que son descendientes directos de las hembras que habitan en la RMG. Mientras que los neonatos encontrados en las costas continentales de Ecuador y Panamá tienen firmas isotópicas similares a las de las hembras adultas que habitan en varias ubicaciones en el PTO. Este trabajo proporciona información sobre el origen de las áreas de cría utilizadas por los adultos de S. lewini que se agrupan en grandes cantidades en las islas oceánicas del PTO, destacando el valor de los modelos isotópicos para generar información útil para la conservación de los tiburones.

Conoce más del artículo científico en el siguiente enlace: www.frontiersin.org/articles/10.3389/fmars.2023.1288770 

 

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In 2022, the Galapagos Science Center (GSC) and the broader UNC & USFQ Galapagos Initiative will celebrate its 10th Anniversary. We are proud to announce the World Summit on Island Sustainability scheduled to be held on June 26–30, 2022 at the Galapagos Science Center and the Community Convention Center on San Cristobal Island.

The content of the World Summit will be distributed globally through social media and results documented through papers published in a book written as part of the Galapagos Book Series by Springer Nature and edited by Steve Walsh (UNC) & Carlos Mena (USFQ) as well as Jill Stewart (UNC) and Juan Pablo Muñoz (GSC/USC). The book will be inclusive and accessible by the broader island community including scientists, managers, residents, tourists, and government and non-government organizations.

While the most obvious goal of organizing the World Summit on Island Sustainability is to celebrate the 10th Anniversary of the GSC and the UNC-USFQ Galapagos Initiative, other goals will be addressed through special opportunities created as part of our operational planning of the World Summit.

For instance, we seek to elevate and highlight the Galapagos in the island conservation discourse, seeking to interact with other island networks in more obvious and conspicuous ways to benefit the Galapagos Islands, the UNC-USFQ Galapagos Initiative, and the world. We will seize the opportunity to further develop the I2N2 – International Islands Network-of-Networks. Further, we wish to highlight and emphasize multiple visions of a sustainable future for the Galapagos Islands and we cannot do this alone. Therefore, engaging the Ecuadorian Ministry of Environment, the Ministry of Tourism, the Government Council of Galapagos, the Galapagos National Park, and local Galapagos authorities, including government and non-government organizations and local citizen groups, is imperative.

The Galapagos Science Center on San Cristobal Island, Galapagos

Borrowing from Hawaii’s and Guam’s Green Growth Program and the Global Island Partnership, we wish to examine existing global programs that emphasize island sustainability and their incorporation into life, policies, and circumstances in the Galapagos Islands. We will also seek to enhance our connections with the institutional members of our International Galapagos Science Consortium and expand the Consortium through the recruitment of other member institutions. We will also work to benefit islands and their local communities by working with citizen groups as well as important NGOs who seek to improve the natural conditions in the Galapagos and diminish the impact of the human dimension on the future of Galapagos’ ecosystems.

Lastly, we will use the World Summit to benefit UNC & USFQ and our constituencies through a strong and vibrant communication plan about the World Summit, creating corporate relationships as sponsors, identifying funding goals through donors, and benefiting our study abroad program for student engagement in the Galapagos Islands. We plan to develop and issue a Galapagos Sustainability Communique after the World Summit that includes the vision and insights of all its participants for a sustainable Galapagos with applicability to global island settings.

We are eager to hear your perspective and have you join us at the World Summit on Island Sustainability!