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.2021 Mar 4;11(7):2956-2962.
doi: 10.1002/ece3.7057. eCollection 2021 Apr.

Detection of the elusive Dwarf sperm whale (Kogia sima) using environmental DNA at Malpelo island (Eastern Pacific, Colombia)

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Detection of the elusive Dwarf sperm whale (Kogia sima) using environmental DNA at Malpelo island (Eastern Pacific, Colombia)

Jean-Baptiste Juhel et al. Ecol Evol..

Abstract

Monitoring large marine mammals is challenging due to their low abundances in general, an ability to move over large distances and wide geographical range sizes.The distribution of the pygmy (Kogia breviceps) and dwarf (Kogia sima) sperm whales is informed by relatively rare sightings, which does not permit accurate estimates of their distribution ranges. Hence, their conservation status has long remained Data Deficient (DD) in the Red list of the International Union for Conservation of Nature (IUCN), which prevent appropriate conservation measures.Environmental DNA (eDNA) metabarcoding uses DNA traces left by organisms in their environments to detect the presence of targeted taxon, and is here proved to be useful to increase our knowledge on the distribution of rare but emblematic megafauna.Retrieving eDNA from filtered surface water provides the first detection of the Dwarf sperm whale (Kogia sima) around the remote Malpelo island (Colombia).Environmental DNA collected during oceanic missions can generate better knowledge on rare but emblematic animals even in regions that are generally well sampled for other taxa.

Keywords: eDNA; megafauna; mobile species; pelagic.

© 2020 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.

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Conflict of interest statement

The authors declare no competing interest.

Figures

FIGURE 1
FIGURE 1
Map of Dwarf sperm whale (Kogia sima) etKogia sp. sightings in the Colombian eastern Pacific
FIGURE 2
FIGURE 2
Location ofKogia sima detections around Malpelo Island using environmental DNA (red and orange track) (a); Malpelo Island seascape and our oceanographic vessel (b); eDNA filtration equipment (c) and Opportunistic sighting ofKogia sp. around Martinique (French West Indies) (d).Kogia sima was detected with both the Vert01 and Mamm01 primer pairs on the circular red track and detected with the Mamm01 primer pair on the rectangular orange track. It was not detected on the gray transects. Credit Photo R. Hocdé, C. Albouy, Megafauna project)
FIGURE 3
FIGURE 3
Phylogenetic tree of the toothed‐whales species (a) and their aligned sequences including the sequence from the eDNA sampling (b). The silhouettes were retrieved from phylopic.org (Chris Huh, Creative Commons Attribution‐ShareAlike 3.0 Unported)
See this image and copyright information in PMC

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References

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