Download or read book Population Trends of the Eastern North Pacific Blue Whale written by Cole Monnahan and published by . This book was released on 2013 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Blue whales (Balaenoptera musculus) were exploited extensively around the world and remain endangered. In the North Pacific their population structure is unclear and current status unknown, with the exception of a well-studied eastern North Pacific (ENP) population. Despite decades without whaling, recent abundance estimates for ENP blue whales indicate a slowed recovery, leading to speculation that their recovery may be hindered by fatal collisions with large vessels. I test this hypothesis by first estimating historical catches and then assessing the population trends with Bayesian population dynamics models under basic assumptions about historical and future ship strikes. I collated previously unreported Soviet catches and combined these with known catches to form the most current estimates of North Pacific blue whale catches. I used the knowledge that ENP whales produce a different song call than blue whales in the western North Pacific to split the conflated catches. The catches were split by estimating spatiotemporal occurrence of blue whales with generalized additive models fitted to acoustic call patterns, which predict the probability a catch belonged to the ENP population based on the proportion of calls of each population recorded by latitude, longitude, and month. When applied to the conflated historical catches, I estimate that ENP blue whale catches totaled 2,969 (95% credible interval 2,301 to 3,516) from 1905-1971, and amounted to 35% (95% credible interval 27% to 41%) of all catches in the North Pacific. The uncertainty in the acoustic data influence the results substantially more than uncertainty in catch locations and dates. These estimated catch series were then combined with abundance estimates and used to assess the recovery of ENP blue whales. I found the population has recovered to a median of 97% of pre-exploitation levels (credible interval 62% to 99%) and thus density dependence is primarily responsible for their slowed recovery. Further, current levels of ship strikes are not an immediate risk and thus ship strike mitigation would impact the population minimally. Indeed, vessel traffic would need to increase 3-5 times the current levels before the population is at risk. The recovery of ENP blue whale is a conservation success story and demonstrates that endangered cetacean populations can recover under careful management.

Download or read book Recent Information on the Status of Large Whales in California Coastal Waters written by Jay Barlow and published by . This book was released on 1993 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Supplemental Environmental Impact Statement written by United States. Minerals Management Service and published by . This book was released on 1989 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Outer Continental Shelf Natural Gas and Oil Resource Management Comprehensive Program 1992 1997 written by United States. Minerals Management Service and published by . This book was released on 1991 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book USCG Pacific Operations Districts 11 and 13 written by and published by . This book was released on 2010 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Assessment of Western North Pacific Gray Whales Eschrichtius Robustus written by Amanda L. Bradford and published by . This book was released on 2003 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Status and Trends of the Nation s Biological Resources written by Catherine E. Puckett Haecker and published by . This book was released on 1998 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book North Pacific Acoustic Laboratory written by and published by . This book was released on 2001 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Whales and climate written by Jan-Olaf Meynecke and published by Frontiers Media SA. This book was released on 2024-01-03 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Southern California Range Complex written by and published by . This book was released on 2008 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Federal Register written by and published by . This book was released on 2012-09 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Our Living Oceans written by and published by . This book was released on 2009 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Outer Continental Shelf Environmental Assessment Program Final Reports of Principal Investigators written by and published by . This book was released on 1989 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Northwest Training Range Complex written by and published by . This book was released on 2010 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Marine Fisheries Review written by and published by . This book was released on 1999 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Status and Trends of the Nation s Biological Resources written by and published by . This book was released on 1998 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Global Population Structure of Blue Whales Balaenoptera Musculus Ssp Based on Nuclear Genetic Variation written by Carole Anne Conway and published by . This book was released on 2005 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: