Katie Kowarski

Katie Kowarski
Dalhousie University | Dal · Department of Biology

PhD Candidate Biology

About

65
Publications
4,217
Reads
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192
Citations
Introduction

Publications

Publications (65)
Article
Full-text available
Little is known of the movements and seasonal occurrence of humpback whales (Megaptera novaeangliae) of South Africa and the Antarctic, populations once brought to near extinction by historic commercial whaling. We investigated the seasonal occurrence and diel-vocalizing pattern of humpback whale songs off the west coast of South Africa (migration...
Article
Six baleen whale species occur off eastern Canada, but little is known of their year-round occurrence across this large region. This complicates identifying areas that are important to them and may require critical habitat designation, especially for those species considered at risk. This is particularly true between fall and spring because of a la...
Article
Full-text available
Experimental research has shown that beaked whales exhibit strong avoidance reactions to naval active sonars used during antisubmarine warfare training exercises, including cessation of echolocation and foraging activity. Behavioural responses to sonar have also been linked to strandings and mortality. Much of the research on the responses of beake...
Article
No PDF available ABSTRACT The Atlantic deep-water Ecosystem Observation Network project (https://adeon.unh.edu/) deployed seven autonomous long-term observatory landers in waters between 250 and 900 m deep along the east coast of the United States for three years (November 2017–November 2020). The objectives of the project included quantifying the...
Article
No PDF available ABSTRACT JASCO’s novel passive acoustic monitoring (PAM) system, OceanObserver was deployed in Canada’s Gulf of Saint Lawrence (GoSL) in autumn 2018 aboard a Slocum G3 glider. The purpose of this mission was to assist in the search for endangered North Atlantic Right Whales and other threatened cetaceans, and to report detections i...
Article
Full-text available
At the onset of the winter breeding season, male humpback whales begin a prominent breeding behaviour, singing. Early songs are produced on summer feeding grounds prior to migration, but little is known about the proximate cues for the initiation of this behaviour, nor where or when it begins. We document the phenology of humpback whale singing alo...
Article
Full-text available
Passive acoustic monitoring (PAM) can inform wildlife management by providing information on the distribution of cetaceans. This paper presents an automatic data selection for validation (ADSV) method to effectively identify all species acoustically present in large PAM data sets. The ADSV method involves the application of automated detectors, the...
Article
Full-text available
Many organizations collect large passive acoustic monitoring (PAM) data sets that need to be efficiently and reliably analyzed. To determine appropriate methods for effective analysis of big PAM data sets, we undertook a literature review of baleen whale PAM analysis methods. Methodologies from 166 studies (published between 2000-2019) were summari...
Article
Full-text available
In 2017, an endangered North Atlantic right whale mortality event in the Gulf of St. Lawrence, Canada, triggered the implementation of dynamic mitigation measures that required real-time information on whale distribution. Underwater glider-based acoustic monitoring offers a possible solution for collecting near real-time information but has many pr...
Chapter
Research into automated systems for detecting and classifying marine mammals in acoustic recordings is expanding internationally due to the necessity to analyze large collections of data for conservation purposes. In this work, we present a Convolutional Neural Network that is capable of classifying the vocalizations of three species of whales, non...
Article
Full-text available
No PDF available ABSTRACT Automatic detection of marine animal vocalizations is increasingly used to analyse the extensive acoustic datasets collected from autonomous passive acoustic recorders, resulting in a constant effort to improve detector accuracy and develop new and more efficient detection methods. Differentiating between the clicks produc...
Article
No PDF available ABSTRACT Recent work [1,2] has shown that Convolutional Neural Networks (CNNs) trained on spectrograms of acoustic signals are capable of learning high-level latent representations for the purpose of detecting and classifying the vocalizations of endangered baleen whales. The aforementioned latent representations were used in the d...
Article
No PDF available ABSTRACT Research into automated systems for detecting marine mammal vocalizations within acoustic recordings is expanding internationally due to the necessity to analyze large collections of data collected for passive acoustic monitoring. Recent work towards the development of such systems using Convolutional Neural Networks (CNNs...
Preprint
Full-text available
Research into automated systems for detecting and classifying marine mammals in acoustic recordings is expanding internationally due to the necessity to analyze large collections of data for conservation purposes. In this work, we present a Convolutional Neural Network that is capable of classifying the vocalizations of three species of whales, non...
Article
Full-text available
Humpback whale songs have been described worldwide and studies exploring non-song vocal behavior continue to expand; however, studies on the transition periods when whales shift to and from the seasonal behavioral state of singing are lacking and may be potentially informative regarding the proximal factors controlling the onset and offset of humpb...
Article
Full-text available
Marine user-environment conflicts can have consequences for ecosystems that negatively affect humans. Strategies and tools are required to identify, predict, and mitigate such conflicts between marine anthropogenic activities and marine wildlife. Estimating individual, population, and species-scale distributions of marine animals has historically b...
Article
Full-text available
Little is known of the spatio-temporal occurrence of beaked whales off western Ireland, limiting the ability of Regulators to implement appropriate management and conservation measures. To address this knowledge gap, static acoustic monitoring was carried out using eight fixed bottom-mounted autonomous acoustic recorders: four from May to December...
Data
Period 2, station1 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 3, station7 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 3, station8 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 4, station7 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 3, station7 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period1, station1 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 2, station2 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 1, station2 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 1, station2 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 1, station4 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 2, station3 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 2, station4 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 3, station5 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 4, station5 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 1, station1 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 2, station3 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 3, station6 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 3, station3 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 4, station8 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 4, station5 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 4, station7 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 3, station8 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 2, station4 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 1, station4 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 2, station1 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 2, station2 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 3, station3 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Period 3, station5 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 4, station6 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 4, station8 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 3, station6 automated detections for Sowerby’s beaked whales. (CSV)
Data
Period 4, station6 automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Manual verification of automated detections for Cuvier’s beaked and northern bottlenose whales. (CSV)
Data
Manual verification of automated detections for Sowerby’s beaked whales. (CSV)
Article
The echolocation signals of most beaked whale species are still unknown. In fact, out of the 22 species comprising the family Ziphiidae, only the echolocation pulses for 7 species have been clearly described. This study describes two distinct beaked whale echolocation signals recorded in the Cook Strait region using passive acoustic technology. The...
Poster
Full-text available
HABITAT PARTITIONING BETWEEN SOWERBY’S AND CUVIER’S BEAKED WHALE OFF WESTERN IRELAND
Poster
Full-text available
BALEEN WHALE COMMUNITY OFF WESTERN IRELAND AS DETERMINED THROUGH STATIC ACOUSTIC MONITORING
Conference Paper
Full-text available
Approximately half of the world’s cetacean species are known to occur in New Zealand waters, yet little is known about their seasonal distribution and abundance. Passive acoustic monitoring provides a non-invasive method of monitoring vocal marine mammal species over larger spatial and temporal scales than visual surveys. In June 2016, New Zealand’...
Article
Humpback whale use of areas off eastern Canada is poorly understood, a knowledge gap that could impact future conservation efforts. We describe the acoustic occurrence of humpback whales in and around the Gully Marine Protected Area (MPA), an eastern Scotian Shelf submarine canyon. Near-continuous acoustic recordings sampling at 16 kHz were collect...
Poster
Full-text available
Little is known of beaked whale (Ziphiidae) distribution and habitat use off western Ireland. Under the ObSERVE Acoustic project, JASCO Applied Sciences and the Galway-Mayo Institute of Technology utilised visual and acoustic survey methods to determine the near year-round occurrence of Ziphiids.
Article
Beaked whales represent some of the least understood marine mammals worldwide with the movements and distribution of many species largely unknown. Around eastern Canada current knowledge is limited to the eastern Scotian shelf and northern bottlenose whales. The acoustic signals of the beaked whale species are recognizable and sufficiently unique t...
Article
Full-text available
The expansion of hydrocarbon exploration in northwest Greenland has made it increasingly important to understand the occurrence of marine mammals in the region. We describe the seasonal occurrence of marine mammals and the spatial distribution of their calls in Baffin Bay and Melville Bay. Four Autonomous Multichannel Acoustic Recorders (AMARs) wer...
Article
Full-text available
In October 2012, Fisheries and Oceans Canada began collection of two years of near-continuous autonomous acoustic recordings in the Gully Marine Protected Area and adjacent slope areas between the Gully and Shortland canyon, and between Shortland and Haldimand canyons south of Nova Scotia, Canada. Data were sampled at 16 ksps for 13 min alternating...
Article
A long-term photo-identification study on long-finned pilot whales (Globicephala melas) offPleasant Bay, Nova Scotia, Canada, expanded to include remote biopsy sampling via crossbow in 2010 to 2012. The present study aims to investigate any negative effects biopsy sampling may have on the animals. During sampling, each shot was vid-eotaped for late...
Article
Full-text available
A long-term photo-identification study on long-finned pilot whales (Globicephala melas) off Pleasant Bay, Nova Scotia, Canada, expanded to include remote biopsy sampling via crossbow in 2010 to 2012. The present study aims to investigate any negative effects biopsy sampling may have on the animals. During sampling, each shot was videotaped for late...

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Projects

Project (1)
Project
This group has been working towards compiling a global social call catalogue for all humpback whale distinct population segments since 2015. To compare each other's datasets, a website is currently under development.