Abstract
Marine top predators are common at offshore bathymetric features such as islands, atolls, and seamounts, where most pelagic reef fish reside, while certain sharks perform inter-island movements between these formations. Scalloped hammerhead sharks are known to school in great numbers at small islands and seamounts in the eastern tropical Pacific (ETP) and are very susceptible to fisheries while moving into the open sea. It is, therefore, essential to understand hammerhead inter-island movements and environmental effects to provide baseline information for their conservation and management within and beyond an insular marine protected area. Movements of scalloped hammerheads were analyzed in the Galapagos Marine Reserve (GMR) and ETP, and environmental factors were linked to their movements. Hammerheads were tagged (N = 134) with V16 coded pingers (July 2006 to July 2010) in the northern Galapagos and detected at listening stations around four islands in the GMR and two isolated islands in the ETP, 700 and 1,200 km away. Hammerheads formed daytime schools at specific locations, but dispersed at night. Overall, more daytime than nighttime detections were recorded at all receivers in the northern Galapagos Islands, and more detections in the up-current sides of these islands. Hammerheads remained more days at the northern islands during part of the warm season (December–February) compared to the cool; however, fewer individuals were present in March–June. Movement modes were diel island excursions (24-h cycles) in the northern Galapagos and inter-island in the GMR and ETP at different scales: (1) short back-and-forth (<50 km, SBF), <5 days cycles, (2) medium distance (50–300 km, MDT), 5–20 days, and (3) long distance (>300 km, LDT), 15–52 days. The high degree of inter-island connectivity of hammerheads within the northern GMR is striking compared to the almost nil movement to the central GMR. A seasonal migratory pattern to locations offshore is indicated by (1) fewer hammerheads observed in the northern GMR during part of the warm season (March–June) and (2) evidence of LDT movements from the northern GMR to other islands in the ETP. LDT movements of mature female hammerheads are possibly associated with pupping areas. Our results indicate that currents, season, and individual behavior mainly drive inter-island movements of hammerheads at small (SBF) and medium (MDT) scales. These findings have important implications for the management of a highly mobile and endangered top predator within a marine protected area and beyond.
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Acknowledgments
We thank the Galapagos National Park and the Charles Darwin Foundation for supporting this project since its inception in 2006 and the captains and crews of the M/N Sierra Negra and M/N Guadalupe River, and Cap. T. Franco provided crucial support for the deployment and maintenance of the array of receivers throughout the GMR. Special thanks to the staff of the Biomar Laboratory of the Charles Darwin Research Station, in particular, M. Wolff, R. Pépolas, J. Delgado, S. Banks. We are indebted to the GNP personnel who assisted in the different phases of this project, especially Cap. P. Moncayo and Cap. O. García and their crews for their invaluable help in the placement of receivers and tagging of sharks. Many thanks to the CDF and GNP volunteers who assisted in fieldwork. Special thanks to all the professional taggers who helped tag almost 150 hammerhead sharks during the course of this study: A. Vázquez, G. Tomalá, G. Vázquez, G. Soler, F. Buyle, R. Pépolas, J. Delgado and P. Zarate. We thank E. Melcon and A. Gottlieb for their assistance on statistical analyses, and K. Kumli for reviewing this manuscript. We would also like to thank the Associate Editor and three anonymous reviewers for their constructive comments and suggestions that greatly improved this manuscript. This work was funded by Conservation International, WWF-Galapagos, Galapagos Conservation Trust, Galapagos Conservancy, Lindblad Expeditions, Oak Foundation, National Geographic, AeroGal, Parques Nacionales Naturales de Colombia, Fondo para la Acción Ambiental y la Niñez, Whitley Fund for Nature. JTK was awarded a UC MEXUS-CONACYT fellowship that supported his doctoral studies at UC Davis and part of this work. Thanks to K. Busto for the editing of figures.
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Communicated by J. D. R. Houghton.
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Ketchum, J.T., Hearn, A., Klimley, A.P. et al. Inter-island movements of scalloped hammerhead sharks (Sphyrna lewini) and seasonal connectivity in a marine protected area of the eastern tropical Pacific. Mar Biol 161, 939–951 (2014). https://doi.org/10.1007/s00227-014-2393-y
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DOI: https://doi.org/10.1007/s00227-014-2393-y