Estimate of Cumberland Sound Beluga (Delphinapterus Leucas) Population Size from the 2014 Visual and Photographic Aerial Survey PDF Download

Author: Marianne Marcoux
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Category :
Languages : en
Pages :

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ISBN:
Category :
Languages : en
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Publisher: Government Printing Office
ISBN: 9780160939952
Category : Biodiversity
Languages : en
Pages : 200

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This is the first report of the Circumpolar Biodiversity Monitoring Program (CBMP) to summarize status and trends in biotic elements in the arctic marine environment. The effort has identified knowledge gaps in circumpolar biodiversity monitoring. CBMP is the cornerstone program of Conservation of Arctic Flora and Fauna (CAFF).

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Category :
Languages : en
Pages : 0

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Belugas (Delphinapterus leucas) in Cumberland Sound are a genetically distinct population in the Canadian eastern Arctic. They have been designated as threatened by the Committee on the Status of Endangered Wildlife in Canada due to a possible decline in abundance. To provide an update to the 2009 population estimate an aerial survey was conducted in August 2014. The 2014 survey had two components; a photographic survey of Clearwater Fiord (a small inlet in the northwest corner of Cumberland Sound), and a visual survey of the northern and western parts of Cumberland Sound. The photographic survey completely covered Clearwater Fiord four times as this is known to be an area where belugas aggregate in the summer months. The survey of the northern part of Cumberland Sound was completed twice, whereas the survey of the western part of Cumberland Sound was completed once. Different correction factors for availability bias were calculated according to the presumed depth at which belugas could be seen from the aircraft and on photos. The corrected estimate for Clearwater Fiord was 603 [coefficient of variance (CV) = 0.076, 95% confidence interval (CI) = 519-699], while the estimate for the northern part of Cumberland Sound was 548 (CV = 0.445, 95% CI = 240-1256). No belugas were seen in the western part of Cumberland Sound. This resulted in a total population abundance of 1151 (CV = 0.214, 95% CI = 760-1744) belugas.

Author: Marianne Marcoux
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ISBN:
Category : White whale
Languages : en
Pages : 35

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Author: Cortney A. Watt
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ISBN: 9780660393278
Category : Whale populations
Languages : en
Pages : 33

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Author: Canadian Science Advisory Secretariat
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Category :
Languages : en
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Author: Jean-François Gosselin
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Category : White whale
Languages : en
Pages : 28

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“The beluga is an Arctic species, and the St. Lawrence Estuary (SLE) population is at the southernmost limit of the species distribution. Up until 2007, the population appeared to be stable. However, unusually high numbers of young of the year found dead in 2008 and 2012, and a low aerial photographic estimate of abundance in 2009, triggered a review of the population status in 2013. Based largely on this review, the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) re-evaluated the status of SLE beluga in 2014, and recommended that the population be designated as ‘Endangered’ (COSEWIC 2014). Here, we present a new abundance index of SLE beluga from a series of eight visual aerial systematic line-transect surveys flown in August and September 2014. This will be used to evaluate trends in abundance along with the 36 visual surveys completed with similar methods since 2001. We also present an update on the number of beluga carcasses that have been recovered since the last assessment (DFO 2014)"--Introd., p. 1, 2.

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Category : White whale
Languages : en
Pages : 11

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Author: Cory J.D. Matthews
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ISBN:
Category : Whale populations
Languages : en
Pages : 20

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