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. 2009 Oct 7;4(10):e7322.
doi: 10.1371/journal.pone.0007322.

From the eye of the albatrosses: a bird-borne camera shows an association between albatrosses and a killer whale in the Southern Ocean

Kentaro Q Sakamoto  1 , Akinori Takahashi, Takashi Iwata, Philip N Trathan
Affiliations

From the eye of the albatrosses: a bird-borne camera shows an association between albatrosses and a killer whale in the Southern Ocean

Kentaro Q Sakamoto et al. PLoS One. .

Abstract

Albatrosses fly many hundreds of kilometers across the open ocean to find and feed upon their prey. Despite the growing number of studies concerning their foraging behaviour, relatively little is known about how albatrosses actually locate their prey. Here, we present our results from the first deployments of a combined animal-borne camera and depth data logger on free-ranging black-browed albatrosses (Thalassarche melanophrys). The still images recorded from these cameras showed that some albatrosses actively followed a killer whale (Orcinus orca), possibly to feed on food scraps left by this diving predator. The camera images together with the depth profiles showed that the birds dived only occasionally, but that they actively dived when other birds or the killer whale were present. This association with diving predators or other birds may partially explain how albatrosses find their prey more efficiently in the apparently 'featureless' ocean, with a minimal requirement for energetically costly diving or landing activities.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Digital still images obtained from three cameras mounted on black-browed albatrosses.
A: a ‘featureless’ sea, B: an iceberg encountered, C: a killer whale breaking the ocean surface, apparent from its dorsal fin (white arrow) and three black-browed albatrosses attracted to the whale, D: two albatrosses flying in association with the camera-mounted bird, E: a fisheries vessel in the distance (white arrow) with an aggregation of birds, F: a bright light source during the night, possibly a vessel or the moon.
Figure 2
Figure 2. Depth and external temperature profiles from a camera-mounted black-browed albatross.
The bird made four dives (>0.5 m: indicated by arrows) over a 2.5-hour period during a foraging trip as indicated by the depth profiles. Rapidly decreasing temperature records were observed in association with dives or possible landing on sea surface (indicated by arrows). The crosses (X) indicate where images of other birds were taken, and the circle indicates where the bird encountered the killer whale (Figure 1C).
See this image and copyright information in PMC

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