Spatio-temporal summer distribution of Cumberland Sound beluga whales (Delphinapterus leucas) in Clearwater Fiord, Nunavut, Canada

The Cumberland Sound (Nunavut, Canada) beluga whale (Delphinapterus leucas (Pallas, 1776)) population has been designated as threatened and updated biological information about summer distribution is required for a sound recovery plan. Variation in aerial survey counts are speculated to occur due to...

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Bibliographic Details
Published in:Arctic Science
Main Authors: Karyn V. Booy, Xavier Mouy, Steven H. Ferguson, Marianne Marcoux
Format: Article in Journal/Newspaper
Language:English
French
Published: Canadian Science Publishing 2021
Subjects:
beluga whale
passive acoustic monitoring
cumberland sound
automated detection
distribution
envir
lang
Canada
Clearwater Fiord
Cumberland Sound
Nunavut
Arctic
Beluga
Beluga whale
Beluga*
Delphinapterus leucas
Online Access:https://doi.org/10.1139/as-2019-0031
https://doaj.org/article/9d9282f98b3d40d2aa03603874289151
Description
Summary:The Cumberland Sound (Nunavut, Canada) beluga whale (Delphinapterus leucas (Pallas, 1776)) population has been designated as threatened and updated biological information about summer distribution is required for a sound recovery plan. Variation in aerial survey counts are speculated to occur due to movement of belugas in and out of the fiord, and there is still uncertainty related to their distribution within key summer habitat. To address these knowledge gaps, non-invasive passive acoustic monitoring (PAM) systems were deployed in August of 2010 and 2011. An automated detector was used to determine presence/absence and quantify calls by recorder site. Results were verified by partial manual analysis of 20% of the files. The detector had a minimum accuracy of 85% for presence/absence and 42% for call quantification. Belugas were detected primarily at the uppermost site of Clearwater Fiord, with detections subsiding with increasing proximity to the fiord entrance. Diel variation in call patterns were quantified at two separate sites in different years, but no correlation was observed between tidal cycles and number of detections. This study indicates that Cumberland Sound beluga may prefer sites at the head of Clearwater Fiord. Further research is required to identify which environmental variables contribute to this observed summer distribution.

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