Using predicted patterns of 3D prey distribution to map king penguin foraging habitat

Roland Proud* (Corresponding Author), Camille Le Guen, Richard Brian Sherley, Akiko Kato, Yan Ropert-Coudert, Norman Ratcliffe, Simon Jarman, Adam Wyness, John P.Y Arnould, Ryan A. Saunders, Paul Fernandes, Lars Boehme, Andrew S. Brierley

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

King penguins (Aptenodytes patagonicus) are an iconic Southern Ocean species, but the prey distributions that underpin their at-sea foraging tracks and diving behaviour remain unclear. We conducted simultaneous acoustic surveys off South Georgia and tracking of king penguins breeding ashore there in Austral summer 2017 to gain insight into habitat use and foraging behaviour. Acoustic surveys revealed ubiquitous deep scattering layers (DSLs; acoustically detected layers of fish and other micronekton that inhabit the mesopelagic zone) at c. 500 m and shallower ephemeral fish schools. Based on DNA extracted from penguin faecal samples, these schools were likely comprised of lanternfish (an important component of king penguin diets), icefish (Channichthyidae spp.) and painted noties (Lepidonotothen larseni). Penguins did not dive as deep as DSLs, but their prey-encounter depth-distributions, as revealed by biologging, overlapped at fine scale (10s of m) with depths of acoustically detected fish schools. We used neural networks to predict local scale (10 km) fish echo intensity and depth
distribution at penguin dive locations based on environmental correlates, and developed models of habitat use. Habitat modelling revealed that king penguins preferentially foraged at locations predicted to have shallow and dense (high acoustic energy) fish schools associated with shallow and dense DSLs. These associations could be used to predict the distribution of king penguins from other colonies at South Georgia for which no tracking data are available, and to identify areas of potential ecological significance within the South Georgia and the South Sandwich Islands marine protected area.
Original languageEnglish
Article number745200
Number of pages18
JournalFrontiers in Marine Science
Volume8
Early online date29 Nov 2021
DOIs
Publication statusPublished - 29 Nov 2021

Keywords

  • acoustic surveys
  • Aptenodytes patagonicu s
  • diving behavior
  • foraging habitat
  • king penguin
  • prey distribution
  • Southern Ocean
  • South Georgia

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