NOAA Technical Memorandum NMFS - Southwest Fisheries ...

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Figure 5. Whaltrak plot of beamform angles with approximated (a) closest distance of approach (nmi) and (b) greatest distance (nmi) for a non-sighted sperm whale acoustic detection. The ships track is indicated by small open circles; final position of the ship is shown as a closed blue circle surrounded by one nautical mile concentric circles as a reference for distance. The “” indicates the position of the sound source as estimated by a bio-acoustician from the convergent beamform angles. The closest distance of approach for groups in passing mode was typically the distance of the group as it passed the hydrophone array. 34
Figure 6. Regression plot of the acoustic detection distance (nmi) of dolphin schools by Beaufort Sea State for the combined surveys. Beaufort sea state explained 2% of the variation in the detection distance (R 2 = 0.002); this was not significant (p = 0.118, n=1501). Figure 7. Regression plots of the acoustic detection distance (nmi) of dolphin schools by Beaufort Sea State for Orcawale 2001 and STAR 2003 surveys. There was an increase in the detection distance with increasing sea state during both ORCAWALE (p = 0.0004, n=111) and STAR 03 (p = 0.0033, n=182). 35
Page 1 and 2: U N I R A P E D T T E M D S E N TA
Page 3: C O L A N IO T A N U N C I EA .S. D
Page 6 and 7: LIST OF TABLES Table 1. Acoustics p
Page 8 and 9: LIST OF FIGURES, con’t Figure 17.
Page 11 and 12: ACOUSTIC STUDIES OF MARINE MAMMALS
Page 13 and 14: transit to and from San Diego, Cali
Page 15 and 16: VHF radio and received using a modi
Page 17 and 18: acoustic detection distance of sper
Page 19 and 20: significantly larger than the mean
Page 21 and 22: vocalizations detected by the acous
Page 23 and 24: were less likely to be detected by
Page 25 and 26: pilot whale (n = 4), common bottlen
Page 27 and 28: species over long ranges, at night,
Page 29 and 30: VII. LITERATURE CITED Au, D., and W
Page 31 and 32: detection and satellite-tracking le
Page 33 and 34: Table 2. Hydrophone array character
Page 35 and 36: Table 5. Summary statistics for aco
Page 37 and 38: Table 9. Number of sightings and th
Page 39 and 40: Table 11. Number of schools from wh
Page 41 and 42: Table 13. Number of sonobuoys deplo
Page 43: M icrophone Hydrophones 1 2 3 4 5 6
Page 47 and 48: Figure 10. Regression plot of the a
Page 49 and 50: Figure 14. Map of study area and mi
Page 51 and 52: Figure 18. Map of study area and fa
Page 53 and 54: Figure 22. Map of study area and Fr
Page 55 and 56: Figure 26. Map of study area and bo
Page 57 and 58: Figure 30. Map of study area and pi
Page 59 and 60: Figure 34. Map of study area and no
Page 61 and 62: Figure 38. Regression plot of the r
Page 63 and 64: VIII. APPENDICES A. Publications Ap
Page 65 and 66: Oswald, J. N. 2006. An examination
Page 67 and 68: Ocean and the Mediterranean Sea. Se
Page 69: RECENT TECHNICAL MEMORANDUMS SWFSC

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