ML 118110

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Common Minke Whale -- Balaenoptera acutorostrata More
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thumps

 

 

Cole Levenson
25 Mar 1974

    Geography
  • Bahamas
    Locality
  • waterbody:North Atlantic OceanGrand Turk Island; U.S. Naval Facility
No locations found with lat/long
    Channels
  • Mono
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NOTES: Notes on tape: "25Mar1974" [MLNS notes: Time announcement was cut off at beginning of tape. Low level thumps throughout, with several louder thump trains interspersed. Notes indicate low background level; however, this recording has very high ambient noise relative to any signals... perhaps tape was mislabeled?] Notes from analysis log: "Cassette number side up - rewind. Ambient level low - hear 'fog horn'-like reference signal. One of the lowest background so far analyzed. Ship traffic picks up a bit at 450. Humpbacks: Pos.; No. Calling: 1? No. Full Calls: N.A. Need for further analysis: No. Notes: Around 784 hear parts of distant hump? Minke: Pos.; No. Heard: 2-3? No. Trains: 22+; Need for further analysis: No - most are moderate in level. Notes: have thump train right away 015, 053, 140, 174, 190, 283, 285, 299, 320, 355, 370, 402, 508, 545, 570, 580, 610, 630, 676, 693 (incomplete) 770, 784. Thump trains at various audio levels. Background is low, lets us hear more thump trains. See analyzer gram (Honeywell)." [MLNS notes: no associated spectrogram found with this tape. 17Dec2003 CB]

[Notes from analysis log for all tapes in the GRANDTURKS series: "Six half-hour background recording samples on selected days for a period of 53 days... to detect the arrival and departure of the Humpback whales (via sounds) for the season in the Caribbean Sea, Mouchier, Navidad and Silver Banks...There are indications that recordings used a 420Hz Low Pass Filter. Recording equipment used was a Realistic model CTR-19. Cassette recorder operating on 110VAC, Freq 60-10,000Ha.. The Realistic recorder is poor recording frequencies below 60Hz as evidenced by spec sheet and sonograms. There is 120 & 180Hz electrical interference 'splatter' on some tapes. In certain cases when the ambient is low, the gain of the systems are raised hence we have heavy interference masking wanted signals. This could be caused by a fluorescent light fixture near the recording system? I doubt that it is in the hydrophone pre-amp network." See analysis log for more details.] SEAOCEAN

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