Author: Publisher:
ISBN: 9780660489674
Category : Whale populations
Languages : en
Pages : 0
Book Description
Abundance and Population Trajectory of St. Lawrence Estuary Beluga
Author: Publisher:
ISBN: 9780660489674
Category : Whale populations
Languages : en
Pages : 0
Book Description
Abundance Index of St. Lawrence Estuary Beluga, Delphinapterus Leucas, from Aerial Visual Surveys Flown in August 2014 and an Update on Reported Deaths
Author: Jean-François GosselinPublisher:
ISBN:
Category : White whale
Languages : en
Pages : 28
Book Description
“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.
An Update of Beluga (Delphinapterus Leucas) Abundance and Reported Deaths in the St. Lawrence River Estuary
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 10
Book Description
"The St. Lawrence Estuary (SLE) beluga population is located at the southernmost limit of the species range. It occurs primarily in the SLE and seasonally in the Gulf of St. Lawrence. A review of the population status (2007) concluded that the population over the period 1988-2007 was stable. However, in recent years there has been an increase in reported deaths of young-of-the-year and an apparent increase in perinatal mortalities. This increase as well as change in the age/sex structure of the deaths suggests that its status may have changed. A review in 2013 incorporated carcass monitoring and aerial survey data into a population model. The model results indicate that the population was slightly increasing from the 1960s to the early 2000s and has probably declined, to under 1000 animals during the last decade. The Committee on the Status of Endangered Wildlife in Canada (COSEWIC) designated the population as ‘endangered’ in 2014, and its status is "threatened" according to the Species at Risk Act. In 2014, new aerial surveys were flown. The Species at Risk directorate requested that these surveys be reviewed and that the number of reported deaths be updated"--Context, p. [1].
Summer Abundance Indices of St. Lawrence Estuary Beluga (Delphinapterus Leucas) from a Photographic Survey in 2009 and 28 Line Transect Surveys from 2001 to 2009
Author: Jean-François GosselinPublisher:
ISBN:
Category : Aerial surveys in wildlife management
Languages : en
Pages : 55
Book Description
St. Lawrence Estuary Beluga Whale
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
It occurs primarily in the SLE and seasonally in the Gulf of St. [...] The significant reduction in abundance in the 20th century was also accompanied by an approximate 65% contraction in the summer range from the 1930s to today. [...] The number of carcasses found "endangered" because of troubling signs of recent declines and cases is recorded and the carcasses are sampled on site or transported to of unexplained mortality in young belugas. [...] Photographic surveys also provide an estimate of the percentage of calves in the population aged 0 Figure 2 Total (open circle) annual reports of dead beluga in the Estuary to 1 year. [...] The as the cause of death for any of the newborns examined, factors that beluga population model did not predict high numbers of newborns can contribute to separation from the mother may be a major cause of that year, and the unusually high number of carcasses found could be calf mortality.
St. Lawrence Beluga Recovery Plan
Author: St. Lawrence Beluga Recovery TeamPublisher:
ISBN:
Category : Endangered species
Languages : en
Pages : 84
Book Description
This document reviews the current state of knowledge about St. Lawrence belugas, recommends a series of actions for ensuring their survival and proposes an implementation schedule. The goal of the Recovery Plan is to bring population numbers and conditions to a state where natural event and human activities will not threaten the survival of the St. Lawrence beluga whale population. A subsidiary goal is to improve the status from endangered to vulnerable, as defined by COSEWIC.
Monitoring the State of the St. Lawrence River : Beluga Whale Population of the Estuary
Author: Canada. Environment CanadaPublisher: Sainte-Foy, Québec : St. Lawrence Vision 2000
ISBN: 9780662332503
Category :
Languages : en
Pages : 1
Book Description
Comparison of Photographic and Visual Abundance Indices of Belugas in the St. Lawrence Estuary in 2003 and 2005
Author: Jean-François GosselinPublisher:
ISBN:
Category : White whale
Languages : en
Pages : 27
Book Description
Comparison of Photographic and Visual Abundance Indicies of Belugas in the St. Lawrence Estuary in 2003 and 2005
Author: J.-F. GosselinMonitoring the State of the St. Lawrence River
Author: Lena N. MeasuresPublisher:
ISBN: 9781100130101
Category : White whale
Languages : en
Pages :
Book Description