John A. Hildebrand

Application of deep learning to estimate blue and fin whale call density in the southern California Current Ecosystem

Michaela N. Alksne, Marie A. Roch, Kaitlin E. Frasier, John A. Hildebrand et autres

Abstract Blue ( Balaenoptera musculus ) and fin whales ( Balaenoptera physalus ) are dominant contributors to low-frequency ocean soundscapes, yet reliably extracting their calls from long-term passive acoustic recordings is methodologically challenging. Here, we train a multi-class deep-learning detector to identify …

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Detection of resonant knapped lithics using chirp sonar

Margaret Morris, Morgan F. Smith, John A. Hildebrand, Petr Krysl et autres

Abstract Sub-bottom profiling (SBP) systems have been used to detect lithics on the seafloor, where their presence has been inferred from a convex pattern of reflections in the water-column portion of the profile, called haystacks. These signals have been attributed to the …

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Shifting responses of goose-beaked whales (Ziphius cavirostris) to long-standing naval sonar exposure opens new perspectives for research and mitigation

Alba Solsona‐Berga, Jennifer S. Trickey, C. G. M. Paxton, Ana Širović et autres

Abstract Predicting and mitigating the impacts of chronic noise on marine mammals is limited by sparse data on repeated disturbance. Naval sonar disrupts species behavior with lethal and sublethal risks, yet mitigation relies on short-term studies. We analyzed a decade of passive …

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Audio files from: High-frequency modulated signals of killer whales (Orcinus orca) in the North Pacific

Anne E. Simonis, Simone Baumann‐Pickering, Erin Oleson, Mariana L. Melcón et autres

Killer whales in the North Pacific, similar to Atlantic populations, produce high-frequency modulated signals, based on acoustic recordings from ship-based hydrophone arrays and autonomous recorders at multiple locations. The median peak frequency of these signals ranged from 19.6–36.1 kHz and median duration …

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Application of deep learning to estimate blue and fin whale call density in the southern California Current Ecosystem

Michaela N. Alksne, Marie A. Roch, Kaitlin E. Frasier, John A. Hildebrand et autres

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Validation of Bone Conduction Hearing in Mysticetes

Petr Krysl, Ted W. Cranford, Margaret Morris, John A. Hildebrand

The skull is a low-frequency external ear in mysticetes! This contribution makes that statement precise, visualizes it with finite-element modeling, and validates it with carefully controlled vibroacoustic experiments on gray whale skulls. The authors synthesize anatomy, modeling, and empirical data to show …

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Long-term monitoring of Ziphius cavirostris behavior using 3D tracking from fixed hydrophone arrays off Southern California

Lauren M. Baggett, Eric R. Snyder, Alba Solsona‐Berga, Isabelle J. Curran et autres

Goose-beaked whales (Ziphius cavirostris) are a deep-diving toothed whale species and top predators in deep sea ecosystems. Much is yet to be learned about their social and foraging strategies due to their elusive behavior, but this information is increasingly relevant given their …

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Validation of a computational model of bone conduction sound reception in mysticetes

Petr Krysl, Margaret Morris, John A. Hildebrand, Ted W. Cranford

Computational models serve as useful complements to physical experiments, but they require validation to build confidence in their applicability. This study outlines the validation of biomechanical models for mysticete sound reception, specifically using experiments involving an instrumented gray whale skull exposed to …

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Characterization and modeling source levels of commercial vessels in the Gulf of Mexico

Katrina H. Johnson, Vanessa M. ZoBell, Lynne Hodge, Melissa S. Soldevilla et autres

The Gulf of Mexico is among the noisiest marine regions globally, primarily due to widespread seismic airgun operations and vessel traffic. While airguns dominate the low-frequency soundscape, vessel traffic also contributes substantial high-amplitude noise in the same range low-frequency band (<500 Hz). …

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Colossal ears? How baleen whales hear low-frequency sound

Ted W. Cranford, Margaret Morris, Petr Krysl, John A. Hildebrand

Baleen whales produce and receive underwater sounds with wavelengths much longer than their bodies, despite having ears approximately the size of a human fist. How do they hear long wavelength sounds with relatively small ears? In 2015, we produced a computational model …

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Narwhal acoustic presence in Eclipse Sound, Nunavut: relationships with sea ice and responses to ships

Eva Hidalgo‐Pla, Alba Solsona‐Berga, Kaitlin E. Frasier, Alex Ootoowak et autres

The Arctic Ocean is undergoing rapid sea ice loss and increasing ship traffic, introducing potential stressors for wildlife and challenges for management and conservation. This study examines narwhal (Monodon monoceros) responses to vessels in eastern Eclipse Sound, Nunavut, Canada using underwater acoustic …

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Evaluating Seasonal vs. Spatial Extrapolation for Cetacean Distribution Models in the California Current

Elizabeth A. Becker, Karin A. Forney, Bruce J. Thayre, Katherine E. Whitaker et autres

ABSTRACT Species distribution models (SDMs) have been developed for multiple cetacean species within the California Current Ecosystem (CCE) from shipboard survey data collected by the Southwest Fisheries Science Center (SWFSC) in summer and fall, thus limiting the ability to inform management decisions …

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