Author: Marianne MarcouxPublisher:
ISBN:
Category : Narwhal
Languages : en
Pages : 16
Book Description
Estimate of the Abundance of the Eclipse Sound Narwhal (Monodon Monoceros) Summer Stock from the 2016 Photographic Aerial Survey
Author: Marianne MarcouxPublisher:
ISBN:
Category : Narwhal
Languages : en
Pages : 16
Book Description
Information Related to the Delineation of the Eclipse Sound and Admiralty Inlet Narwhal Stocks
Author: Estimated Abundance and Total Allowable Landed Catch for the Eclipse Sound Narwhal Stock
Author: Eclipse Sound Narwhal (Monodon Monoceros) Movement and Hunt Composition and Its Relevance to Stock Delineation
Author: Marianne MarcouxPublisher:
ISBN: 9780660386126
Category : Narwhal
Languages : en
Pages : 25
Book Description
Narwhal (Monodon Monoceros) Abundance Estimate from the 2018 Aerial Survey of the Northern Hudson Bay Population
Author: Cortney A. WattPublisher:
ISBN:
Category : Aerial surveys in wildlife management
Languages : en
Pages : 15
Book Description
Evaluation of LGL Visual Aerial Survey Data for Estimating Narwhal Abundance in Eclipse Sound During the Open-water Season 2013-2015
Author: Cory J.D. MatthewsPublisher:
ISBN:
Category : Narwhal
Languages : en
Pages : 23
Book Description
Impact of the 2015 Narwhal (Monodon Monoceros) Entrapment on the Eclipse Sound Stock
Author: The Abundance of Narwhal (Monodon Monoceros L.) in Admiralty Inlet, Northwest Territories, Canada, and Implications of Behavior for Survey Estimates
Author: Larry P. DueckPublisher:
ISBN:
Category : Narwhal
Languages : en
Pages : 216
Book Description
The diving behavior of narwhal (Monodon monoceros L.) in Admiralty Inlet, Northwest Territories was investigated using scan and focal-animal sampling techniques, in order to determine the proportion of narwahl out-of-sight during aerial photographic surveys.
The Distribution of Narwhal (Monodon Monoceros) Males, Females, and Newborns in the Canadian Arctic Archipelago
Author: Bertrand CharryPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
"The narwhal (Monodon monoceros) is a medium-sized odontocete exclusively found in Arctic waters. The remoteness of their environment in conjunction with their widespreaddistribution poses numerous challenges to studying this Arctic species at a population level. The narwhal is a species with knowledge gaps regarding their population structure and the distribution of different sexes and age classes. This thesis provides a detailed description of narwhal distribution in the Canadian Arctic Archipelago using the non-invasive method of aerial photography to identify and geo-locate narwhal males, females, and newborns. In August 2013, Fisheries and Oceans Canada (DFO) conducted an extensive aerial survey of narwhal summer habitat to estimate the abundance of the Baffin Bay population. I used the georeferenced photographs collected during the surveys to develop a dichotomous key to identify newborns from photographs. The key was also used to describe the distribution of narwhal males, females, and newborns. I used a Cohen's Kappa test, across four observers, to test the replicability of the key, with strong positive results. Within the 3,393 photographs analyzed I detected 6,315 different individuals. I could identify the sex of 2,804 individuals and identified 141 newborns. To analyze the distribution of narwhals, I first used the least cost path algorithm to construct a matrix of swimming distances between individuals. Then, I performed a partitioning around the medoids algorithm, a variation of the k-means algorithm, to divide my dataset into k clusters based on the swimming distances. I found five main clusters of narwhals that align closely with four narwhal management zones currently defined by DFO. These four management zones correspond to different narwhal stocks determined through local knowledge, telemetry data, and genetics. Narwhals were unevenly distributed between each cluster and I found different male:female sex ratios varying from 0.71 to 1.4, newborns represented 10% of the number of females present in each cluster. This thesis is the first to shed light on narwhal newborn-mother spatial patterns and narwhal sex distribution of the Baffin Bay population in the Canadian Arctic Archipelago." --
Impact of the 2015 Narwhal (Monodon Monoceros) Entrapment on the Eclipse Sound Narwhal Stock
Author: Canadian Science Advisory SecretariatPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description