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Investigating Blue and Fin Whale Populations Through Passive Acoustic Monitoring Using Ocean Bottom Seismometers
Investigating Blue and Fin Whale Populations Through Passive Acoustic Monitoring Using Oce...
Investigating Blue and Fin Whale Populations Through Passive Acoustic Monitoring Using Ocean Bottom Seismometers

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자료유형  
 학위논문 서양
최종처리일시  
20250211152211
ISBN  
9798383223635
DDC  
534
저자명  
Hilmo, Rose.
서명/저자  
Investigating Blue and Fin Whale Populations Through Passive Acoustic Monitoring Using Ocean Bottom Seismometers
발행사항  
[Sl] : University of Washington, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
176 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
주기사항  
Advisor: Wilcock, William S. D.
학위논문주기  
Thesis (Ph.D.)--University of Washington, 2024.
초록/해제  
요약Many large baleen whale species are endangered due to decades of commercial whaling before its international ban in the 1980s. Monitoring the recovery of their populations is difficult to study with traditional animal survey methods. Visual transect methods using ships and planes cover only small portions of baleen whales' vast migratory ranges that span thousands of kilometers and are incomplete because they only record surfacing whales. GPS tagging studies are invaluable for studying behavior but are limited to small numbers due to cost. Passive acoustic monitoring (PAM), which detects whale presence through recording calls, is a complementary method that is not sight-limited and can provide long-term continuous data on a large spatial scale. Ocean bottom seismometers (OBSs), geophysical instruments used to study earthquakes through recording ground motion, are opportunistic PAM sensors that record large baleen whale calls. There are large amounts of publicly available OBS data, but these datasets have so far been underutilized as tool to study whales. This dissertation develops new methodologies for PAM using OBSs and highlights their utility for characterizing populations and studying behaviors of fin and blue whales. In Chapter 2, I develop, implement, and evaluate a method for ranging to fin whales using multipath reflected arrivals of calls on solitary OBSs deployed in different regions of the abyssal ocean. I demonstrate how to account for various site properties and discuss how the method might be implemented in different environments. In Chapter 3, I employ the multipath ranging method and point-transect distance sampling methods to estimate fin whale call densities using OBSs deployed in the Marianas region. This chapter demonstrates the utility of single-OBS ranging for estimating populations through PAM. In Chapter 4, I employ a previously developed acoustic localization algorithm to track calling northeast Pacific (NEP) blue whales with a pair of large OBS networks off the Pacific Northwest coast. I characterize the behavior of an understudied subpopulation of NEP blue whales that skip southward migration to investigate how they are using the temperate habitat while they overwinter. Behavioral metrics indicate that overwintering whales likely forage off the coast of Washington and Vancouver Island throughout the fall and early winter.
일반주제명  
Acoustics
일반주제명  
Marine geology
일반주제명  
Biology
키워드  
Blue whale
키워드  
Density estimation methods
키워드  
Fin whales
키워드  
Migration
키워드  
Ocean bottom seismometers
기타저자  
University of Washington Oceanography
기본자료저록  
Dissertations Abstracts International. 86-01B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■1001  ▼aHilmo,  Rose.
■24510▼aInvestigating  Blue  and  Fin  Whale  Populations  Through  Passive  Acoustic  Monitoring  Using  Ocean  Bottom  Seismometers
■260    ▼a[Sl]▼bUniversity  of  Washington▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a176  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-01,  Section:  B.
■500    ▼aAdvisor:  Wilcock,  William  S.  D.
■5021  ▼aThesis  (Ph.D.)--University  of  Washington,  2024.
■520    ▼aMany  large  baleen  whale  species  are  endangered  due  to  decades  of  commercial  whaling  before  its  international  ban  in  the  1980s.  Monitoring  the  recovery  of  their  populations  is  difficult  to  study  with  traditional  animal  survey  methods.  Visual  transect  methods  using  ships  and  planes  cover  only  small  portions  of  baleen  whales'  vast  migratory  ranges  that  span  thousands  of  kilometers  and  are  incomplete  because  they  only  record  surfacing  whales.  GPS  tagging  studies  are  invaluable  for  studying  behavior  but  are  limited  to  small  numbers  due  to  cost.  Passive  acoustic  monitoring  (PAM),  which  detects  whale  presence  through  recording  calls,  is  a  complementary  method  that  is  not  sight-limited  and  can  provide  long-term  continuous  data  on  a  large  spatial  scale.  Ocean  bottom  seismometers  (OBSs),  geophysical  instruments  used  to  study  earthquakes  through  recording  ground  motion,  are  opportunistic  PAM  sensors  that  record  large  baleen  whale  calls.  There  are  large  amounts  of  publicly  available  OBS  data,  but  these  datasets  have  so  far  been  underutilized  as  tool  to  study  whales.  This  dissertation  develops  new  methodologies  for  PAM  using  OBSs  and  highlights  their  utility  for  characterizing  populations  and  studying  behaviors  of  fin  and  blue  whales.  In  Chapter  2,  I  develop,  implement,  and  evaluate  a  method  for  ranging  to  fin  whales  using  multipath  reflected  arrivals  of  calls  on  solitary  OBSs  deployed  in  different  regions  of  the  abyssal  ocean.  I  demonstrate  how  to  account  for  various  site  properties  and  discuss  how  the  method  might  be  implemented  in  different  environments.  In  Chapter  3,  I  employ  the  multipath  ranging  method  and  point-transect  distance  sampling  methods  to  estimate  fin  whale  call  densities  using  OBSs  deployed  in  the  Marianas  region.  This  chapter  demonstrates  the  utility  of  single-OBS  ranging  for  estimating  populations  through  PAM.  In  Chapter  4,  I  employ  a  previously  developed  acoustic  localization  algorithm  to  track  calling  northeast  Pacific  (NEP)  blue  whales  with  a  pair  of  large  OBS  networks  off  the  Pacific  Northwest  coast.  I  characterize  the  behavior  of  an  understudied  subpopulation  of  NEP  blue  whales  that  skip  southward  migration  to  investigate  how  they  are  using  the  temperate  habitat  while  they  overwinter.  Behavioral  metrics  indicate  that  overwintering  whales  likely  forage  off  the  coast  of  Washington  and  Vancouver  Island  throughout  the  fall  and  early  winter.
■590    ▼aSchool  code:  0250.
■650  4▼aAcoustics
■650  4▼aMarine  geology
■650  4▼aBiology
■653    ▼aBlue  whale
■653    ▼aDensity  estimation  methods
■653    ▼aFin  whales
■653    ▼aMigration
■653    ▼aOcean  bottom  seismometers
■690    ▼a0986
■690    ▼a0556
■690    ▼a0306
■71020▼aUniversity  of  Washington▼bOceanography.
■7730  ▼tDissertations  Abstracts  International▼g86-01B.
■790    ▼a0250
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163155▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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