Johnson Mark P.

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Johnson
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Mark P.
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Now showing 1 - 20 of 126
  • Dataset
    Physeter macrocephalus Gulf of Mexico 6/16/2003 Animal a Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution. Contact: dtag@whoi.edu, 2008-09-16T15:29:01Z) Johnson, Mark P. ; Woods Hole Oceanographic Institution
    Location: Gulf of Mexico, Species: Physeter macrocephalus (Sperm Whale, Cachalot), Permit: Permit # 981-1707 issued to Peter L. Tyack, Water Depth: 973m
  • Article
    Ascent exhalations of Antarctic fur seals : a behavioural adaptation for breath-hold diving?
    (Royal Society, 2005-02-22) Hooker, Sascha K. ; Miller, Patrick J. O. ; Johnson, Mark P. ; Cox, Oliver P. ; Boyd, Ian L.
    Novel observations collected from video, acoustic and conductivity sensors showed that Antarctic fur seals consistently exhale during the last 50–85% of ascent from all dives (10–160 m, n > 8000 dives from 50 seals). The depth of initial bubble emission was best predicted by maximum dive depth, suggesting an underlying physical mechanism. Bubble sound intensity recorded from one seal followed predictions of a simple model based on venting expanding lung air with decreasing pressure. Comparison of air release between dives, together with lack of variation in intensity of thrusting movement during initial descent regardless of ultimate dive depth, suggested that inhaled diving lung volume was constant for all dives. The thrusting intensity in the final phase of ascent was greater for dives in which ascent exhalation began at a greater depth, suggesting an energetic cost to this behaviour, probably as a result of loss of buoyancy from reduced lung volume. These results suggest that fur seals descend with full lung air stores, and thus face the physiological consequences of pressure at depth. We suggest that these regular and predictable ascent exhalations could function to reduce the potential for a precipitous drop in blood oxygen that would result in shallow-water blackout.
  • Recording, acoustical
    Globicephala melas/macrorhynchus Tenerife, Canary Islands, Spain 3/23/2003 Animal a Audio Recordings
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contact: dtag@whoi.edu, cetaceos@ull.es, 2010-05-21T12:35:46Z) Aguilar De Soto, Natacha ; Johnson, Mark P. ; Woods Hole Oceanographic Institution ; University of La Laguna
    Ascent from a "shallow" dive at 122 m. Clicks, buzzes and squeaks. Permit: Granted to ULL from the Canary Island Government (no permit number), Sponsor: SERDP, Location: Tenerife, Canary Islands, Spain, Species: Globicephala melas/macrorhynchus (Pilot Whale), Depth at start: 90.72 m, Depth at end: 47.07 m, Start time in sec since tag on: 498, End time in sec since tag on 558
  • Dataset
    Mesoplodon densirostris El Hierro, Canary Islands, Spain 10/11/2003 Animal a Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contact: dtag@whoi.edu, cetaceos@ull.es, 2008-08-28T14:38:00Z) Johnson, Mark P. ; Aguilar De Soto, Natacha ; Woods Hole Oceanographic Institution ; University of La Laguna
    DTAG data from a tagged Blainville's beaked whale; depth (m) over time (s). Location: El Hierro, Canary Islands, Spain, Species: Mesoplodon densirostris (Blainville's Beaked Whale), Permit: Granted to ULL from the Canary Island Government (no permit number), Water Depth: 65m
  • Dataset
    Physeter macrocephalus North Atlantic (Delaware) 7/25/2003 Animal a Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution. Contact: dtag@whoi.edu, 2008-09-16T15:29:03Z) Johnson, Mark P. ; Woods Hole Oceanographic Institution
    Location: North Atlantic (Delaware), Species: Physeter macrocephalus (Sperm Whale, Cachalot), Permit: Gulf of Mexico, Water Depth: 2521m
  • Dataset
    Globicephala melas/macrorhynchus Tenerife, Canary Islands, Spain 11/4/2003 Animal a Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contacts: dtag@whoi.edu, cetaceos@ull.es, 2008-10-01T14:20:58Z) Johnson, Mark P. ; Aguilar De Soto, Natacha ; Woods Hole Oceanographic Institution ; University of La Laguna
    Location: Tenerife, Canary Islands, Spain, Species: Globicephala melas/macrorhynchus (Pilot Whale), Permit: Granted to University of La Laguna from the Canary Island Government (no permit number), Water Depth: 1642m
  • Recording, acoustical
    Globicephala melas/macrorhynchus Tenerife, Canary Islands, Spain 3/18/2003 Animal b Audio Recordings
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contact: dtag@whoi.edu, cetaceos@ull.es, 2010-06-14T14:29:42Z) Aguilar De Soto, Natacha ; Johnson, Mark P. ; Woods Hole Oceanographic Institution ; University of La Laguna
    Recordings at the surface, whistles. Permit: Granted to ULL from the Canary Island Government (no permit number), Sponsor: SERDP, Location: Tenerife, Canary Islands, Spain, Species: Globicephala melas/macrorhynchus (Pilot Whale), Depth at start: 1.22 m, Depth at end: 1.04 m, Start time in sec since tag on: 16385, End time in sec since tag on 16410
  • Dataset
    Physeter macrocephalus Mediterranean 9/10/2003 Animal a Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution. Contact: dtag@whoi.edu, 2008-10-01T14:33:52Z) Johnson, Mark P. ; Woods Hole Oceanographic Institution
    Location: Mediterranean, Species: Physeter macrocephalus (Sperm Whale, Cachalot), Permit: NMFS Permit # 981-1707 issued to Peter L. Tyack, Water Depth: 587m
  • Dataset
    Globicephala melas/macrorhynchus Tenerife, Canary Islands, Spain 3/19/2003 Animal b Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contacts: dtag@whoi.edu, cetaceos@ull.es, 2008-08-28T15:02:01Z) Johnson, Mark P. ; Aguilar De Soto, Natacha ; Woods Hole Oceanographic Institution ; University of La Laguna
    Location: Tenerife, Canary Islands, Spain, Species: Globicephala melas/macrorhynchus (Pilot Whale), Permit: Granted to University of La Laguna from the Canary Island Government (no permit number), Water Depth: 1261m
  • Dataset
    Physeter macrocephalus Gulf of Mexico 8/25/2002 Animal a Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution. Contact: dtag@whoi.edu, 2008-07-25T19:58:21Z) Johnson, Mark P. ; Woods Hole Oceanographic Institution
    DTAG data from a tagged sperm whale; depth (m) over time (s). Location: Gulf of Mexico, Species: Physeter macrocephalus (Sperm Whale, Cachalot), Permit: Research was conducted under permit #981-1578 issued by NMFS under the authority of the MMPA and the EPA, Water Depth: 1031
  • Article
    Drag of suction cup tags on swimming animals : modeling and measurement
    (John Wiley & Sons, 2013-11-12) Shorter, K. Alex ; Murray, Mark M. ; Johnson, Mark P. ; Moore, Michael J. ; Howle, Laurens E.
    Bio-logging tags are widely used to study the behavior and movements of marine mammals with the tacit assumption of little impact to the animal. However, tags on fast-swimming animals generate substantial hydrodynamic forces potentially affecting behavior and energetics adversely, or promoting early removal of the tag. In this work, hydrodynamic loading of three novel tag housing designs are compared over a range of swimming speeds using computational fluid dynamics (CFD). Results from CFD simulation were verified using tag models in a water flume with close agreement. Drag forces were reduced by minimizing geometric disruptions to the flow around the housing, while lift forces were reduced by minimizing the frontal cross-sectional area of the housing and holding the tag close to the attachment surface. Hydrodynamic tag design resulted in an experimentally measured 60% drag force reduction in 5.6 m/s flow. For all housing designs, off-axis flow increased the magnitude of the force on the tag. Experimental work with a common dolphin (Delphinus delphis) cadaver indicates that the suction cups used to attach the types of tags described here provide sufficient attachment force to resist failure to predicted forces at swimming speeds of up to 10 m/s.
  • Recording, acoustical
    Globicephala melas/macrorhynchus Tenerife, Canary Islands, Spain 11/3/2003 Animal c Audio Recordings
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contact: dtag@whoi.edu, cetaceos@ull.es, 2010-05-25T17:23:57Z) Aguilar De Soto, Natacha ; Johnson, Mark P. ; Woods Hole Oceanographic Institution ; University of La Laguna
    Clicks and long buzz during end of the discent to max depth and begin of the ascent phase of a 75m dive. Permit: Granted to ULL from the Canary Island Government (no permit number), Sponsor: SERDP, Location: Tenerife, Canary Islands, Spain, Species: Globicephala melas/macrorhynchus (Pilot Whale), Depth at start: 35.50 m, Depth at end: 56.02 m, Start time in sec since tag on: 7471, End time in sec since tag on 7505
  • Recording, acoustical
    Globicephala melas/macrorhynchus Tenerife, Canary Islands, Spain 3/23/2003 Animal c Audio Recordings
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contact: dtag@whoi.edu, cetaceos@ull.es, 2010-06-30T13:02:56Z) Aguilar De Soto, Natacha ; Johnson, Mark P. ; Woods Hole Oceanographic Institution ; University of La Laguna
    Whistles, clicks and buzz during the ascent phase of a deep dive. Permit: Granted to ULL from the Canary Island Government (no permit number), Sponsor: SERDP, Location: Tenerife, Canary Islands, Spain, Species: Globicephala melas/macrorhynchus (Pilot Whale), Depth at start: 484.77 m , Depth at end: 446.24 m, Start time in sec since tag on: 2506, End time in sec since tag on 2524
  • Dataset
    Physeter macrocephalus Gulf of Mexico 8/26/2002 Animal b Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution. Contact: dtag@whoi.edu, 2008-07-25T19:58:15Z) Johnson, Mark P. ; Woods Hole Oceanographic Institution
    DTAG data from a tagged sperm whale; depth (m) over time (s). Location: Gulf of Mexico, Species: Physeter macrocephalus (Sperm Whale, Cachalot), Permit: Research was conducted under permit #981-1578 issued by NMFS under the authority of the MMPA and the EPA, Water Depth: 779
  • Recording, acoustical
    Globicephala melas/macrorhynchus Tenerife, Canary Islands, Spain 3/19/2003 Animal a Audio Recordings
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contact: dtag@whoi.edu, cetaceos@ull.es, 2010-06-16T15:14:55Z) Aguilar De Soto, Natacha ; Johnson, Mark P. ; Woods Hole Oceanographic Institution ; University of La Laguna
    Deep dive, clicks and buzz during the discent phase. Permit: Granted to ULL from the Canary Island Government (no permit number), Sponsor: SERDP, Location: Tenerife, Canary Islands, Spain, Species: Globicephala melas/macrorhynchus (Pilot Whale), Depth at start: 571.01 m, Depth at end: 594.22 m, Start time in sec since tag on: 424, End time in sec since tag on 461
  • Dataset
    Globicephala melas/macrorhynchus Tenerife, Canary Islands, Spain 3/23/2003 Animal a Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contacts: dtag@whoi.edu, cetaceos@ull.es, 2008-08-28T15:01:58Z) Johnson, Mark P. ; Aguilar De Soto, Natacha ; Woods Hole Oceanographic Institution ; University of La Laguna
    Location: Tenerife, Canary Islands, Spain, Species: Globicephala melas/macrorhynchus (Pilot Whale), Permit: Granted to University of La Laguna from the Canary Island Government (no permit number), Water Depth: 1371m
  • Dataset
    Physeter macrocephalus North Atlantic (Delaware) 7/16/2003 Animal a Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution. Contact: dtag@whoi.edu, 2008-09-16T15:28:59Z) Johnson, Mark P. ; Woods Hole Oceanographic Institution
    Location: North Atlantic (Delaware), Species: Physeter macrocephalus (Sperm Whale, Cachalot), Permit: Gulf of Mexico, Water Depth: 497m
  • Dataset
    Physeter macrocephalus Gulf of Mexico 9/11/2002 Animal b Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution. Contact: dtag@whoi.edu, 2008-07-25T17:59:55Z) Johnson, Mark P. ; Woods Hole Oceanographic Institution
    DTAG data from a tagged sperm whale; depth (m) over time (s). Location: Gulf of Mexico, Species: Physeter macrocephalus (Sperm Whale, Cachalot), Permit: Research was conducted under permit #981-1578 issued by NMFS under the authority of the MMPA and the EPA, Water Depth: 785
  • Dataset
    Globicephala melas/macrorhynchus Tenerife, Canary Islands, Spain 3/19/2003 Animal a Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contacts: dtag@whoi.edu, cetaceos@ull.es, 2008-08-28T15:01:59Z) Johnson, Mark P. ; Aguilar De Soto, Natacha ; Woods Hole Oceanographic Institution ; University of La Laguna
    Location: Tenerife, Canary Islands, Spain, Species: Globicephala melas/macrorhynchus (Pilot Whale), Permit: Granted to University of La Laguna from the Canary Island Government (no permit number), Water Depth: 2127m
  • Dataset
    Globicephala melas/macrorhynchus Tenerife, Canary Islands, Spain 11/2/2003 Animal d Depth Profile
    (The DTAG Project, Woods Hole Oceanographic Institution and University of La Laguna. Contacts: dtag@whoi.edu, cetaceos@ull.es, 2008-10-01T14:21:06Z) Johnson, Mark P. ; Aguilar De Soto, Natacha ; Woods Hole Oceanographic Institution ; University of La Laguna
    Location: Tenerife, Canary Islands, Spain, Species: Globicephala melas/macrorhynchus (Pilot Whale), Permit: Granted to University of La Laguna from the Canary Island Government (no permit number), Water Depth: 1073m