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Evaluation of humpback whales wintering in Central America and southern Mexico as a demographically independent population
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2021
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[PDF-599.04 KB]
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Description:The Guidelines for Preparing Stock Assessment Reports Pursuant to the 1994 Amendments to the Marine Mammal Protection Act specify that a stock under the Act should, whenever possible, comprise a demographically independent population (DIP). Considerable new data suggest the existence of potential DIPs within some distinct population segments (DPSs) of the North Pacific subspecies of humpback whales (Megaptera novaeangliae kuzira), however this document considers evidence for a case where the DPS contains only a single DIP. This putative DIP is composed of the animals that winter in the waters offshore of Central America, nearly all of whom spend summers off of the U.S. west coast, called the CentAm/SMex-CA/OR/WA unit. A status review conducted in 2015 concluded that, based on genetics and movement data, this group of animals met the criteria of a DPS) (Bettridge et al. 2015), and they were subsequently listed as an endangered DPS under the Endangered Species Act (ESA).
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Rights Information:Public Domain
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