How important are herring to humpback whales? The role of herring in meeting the energetic requirements of humpback whales in a British Columbian feeding ground

• Main Author: McMillan, Christie Jane
• Format: Other/Unknown Material
• Language: unknown
• Published: 2014
• Subjects: Canada; Pacific; British Columbia; Queen Charlotte; Humpback Whale; Megaptera novaeangliae
• Online Access: http://summit.sfu.ca/item/14870

Management of cetacean populations is a global conservation concern. The North Pacific humpback whale (Megaptera novaeangliae) in Canada is listed as threatened under the Species At Risk Act, and prey reduction has been identified as a threat to this population. I used focal follows of humpback whales and underwater video of herring schools to estimate Pacific herring (Clupea pallasi) consumption by humpback whales in eastern Queen Charlotte Strait, British Columbia. I combined these results with a bioenergetic model to estimate sex- and age-specific annual energetic requirements of humpback whales to determine the proportion of these requirements that are met by herring. Non-reproductive female, pregnant female, and juvenile and adult male humpbacks met over 50% of their estimated energetic requirements by feeding on herring, while juvenile and lactating females met between 25 and 50% of their requirements. These results can lead to improved management decisions for both humpback whales and herring.