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Oceanic thermal structure mediates dive sequences in a foraging seabird.

Xavier Meyer1,2, Andrew J J MacIntosh2, Andre Chiaradia3

  • 1CNRS IPHC UMR7178 Université de Strasbourg Strasbourg France.

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Summary

Little penguins

Keywords:
Eudyptula minorbehavioral complexityforaging behaviorfractal analysislittle penguinsea surface temperaturethermocline

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Area of Science:

  • Marine ecology
  • Animal behavior

Background:

  • Seabirds, as upper-level predators, reflect marine ecosystem changes.
  • Oceanographic features like sea surface temperature (SST), water stratification, and wind speed influence prey availability.

Purpose of the Study:

  • To investigate how SST, water stratification, and wind speed affect little penguin diving behavior and foraging complexity.
  • To understand the relationship between environmental conditions and penguin foraging strategies.

Main Methods:

  • Fractal time series analysis was used to assess the complexity and memory in penguin dive patterns.
  • Diving parameters and temporal organization of behavior were analyzed in relation to oceanographic data.

Main Results:

  • Foraging complexity in little penguins was linked to SST and water stratification, not wind speed.
  • Penguins in warmer, more stratified waters showed increased dive sequence memory, suggesting adaptation to prey aggregation near the thermocline.
  • These penguins exhibited higher foraging efficiency, more dives, and shallower dive depths.

Conclusions:

  • Environmental factors, particularly SST and stratification, significantly influence the foraging behavior and efficiency of little penguins.
  • Changes in dive sequence memory may indicate adaptive strategies for prey exploitation versus exploration under varying ocean conditions.
  • Little penguin diving patterns serve as sensitive indicators of marine ecosystem dynamics and climate change impacts.