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April 30, 2026Aquatic Conservation Marine and Freshwater EcosystemsOpen Access

Shifting Seas, Changing Diets: Evidence of Temporal Dietary Shifts in Marine Megafauna in Southern Brazil (2017–2023)

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Authors

JGJoao Bosco GusmaoMMMário Roberto Castro Meira-FilhoCDCamila Domit

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Overview

Analysis reveals dietary variation in marine mammals and sea turtles in Southern Brazil, suggesting ecological shifts due to environmental pressures.

Key Points

  • This research examines the dietary trends of marine megafauna to assess ecological interactions and environmental changes.
  • Analyzed gut content data from stranded marine megafauna along the Paraná coastline between 2017 and 2023.
  • Utilized species richness estimators and Canonical Analysis of Principal Coordinates to assess diet changes.
  • Identified 50 prey items consumed by multiple megafaunal species.
  • Significant temporal dietary shifts observed in green sea turtles, Guiana dolphins, Magellanic penguins, and brown boobies.
  • Diets reflected opportunistic feeding influenced by fishing discards and changing prey availability.
  • Findings indicate potential food-web restructuring and increased reliance on lower-value prey.

Cite This Study

Gusmao et al. (2026) studied this question.

synapsesocial.com/papers/69f2a4578c0f03fd6776368dhttps://doi.org/10.1002/aqc.70372
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