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Marine Ecology Progress Series

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MEPS 649:111-123 (2020)  -  DOI:

Instantaneous vs. non-instantaneous diver-operated stereo-video (DOV) surveys of highly mobile sharks in the Galápagos Marine Reserve

Adam N. H. Smith1,*, David Acuña-Marrero1,2, Pelayo Salinas-de-León2,3, Euan S. Harvey4, Matthew D. M. Pawley1, Marti J. Anderson5

1School of Natural and Computational Sciences (SNCS), Massey University, 0745 Auckland, New Zealand
2Department of Marine Sciences, Charles Darwin Research Station, Puerto Ayora 200350, Islas Galápagos, Ecuador
3Pristine Seas, National Geographic Society, Washington, DC 20036, USA
4School of Molecular and Life Sciences, Curtin University, 6845 Perth, Australia
5New Zealand Institute for Advanced Study (NZIAS), Massey University, 0745 Auckland, New Zealand
*Corresponding author:

ABSTRACT: Effective management of wild populations of animals relies on having accurate methods for estimating their densities from field surveys. Surveying sharks and other highly mobile marine predators is particularly difficult, requiring specialised methods that can entail a range of potential biases. Recent simulation studies have suggested that non-instantaneous visual and video survey methods may overestimate densities of highly mobile fishes. A non-instantaneous method is one where each point in space is surveyed for a non-negligible period of time, rather than in an instantaneous ‘snapshot’, allowing animals to move into the survey space during the survey period. We conducted instantaneous and non-instantaneous surveys of sharks (Sphyrna lewini and Carcharhinus galapagensis) around Darwin and Wolf Islands (Galápagos Islands, Ecuador) using diver-operated stereo-video (stereo-DOV) systems with towed GPS. We provide the first empirical evidence of non-instantaneous bias and show that the degree of bias is negatively related to diver swimming speed. At a speed of 40 m min-1, the non-instantaneous method recorded twice as many sharks as the instantaneous method. The bias may be as high as 10 fold at slow speeds (23 m min-1) and negligible at very fast speeds (65 m min-1). Moreover, we used GPS data to produce fine-scale distribution maps, revealing high densities in areas of strong currents along the south-eastern sides of both islands. We recommend the use of stereo-DOV systems with GPS and fast swimming speeds for surveying highly mobile sharks, to produce more realistic estimates of densities on which to base management of these species.

KEY WORDS: Density estimates · Fish counts · Highly mobile sharks · Instantaneous and non-instantaneous surveys · Spatial distribution · Underwater video methods

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Cite this article as: Smith ANH, Acuña-Marrero D, Salinas-de-León P, Harvey ES, Pawley MDM, Anderson MJ (2020) Instantaneous vs. non-instantaneous diver-operated stereo-video (DOV) surveys of highly mobile sharks in the Galápagos Marine Reserve. Mar Ecol Prog Ser 649:111-123.

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