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Title: Characterizing the Long-Term, Wide-Band and Deep-Water Soundscape Off Hawai’i
Status: Completed
Creation Date: 2019-11-23
Revision Date: 2021-11-24
Publication Date: 2021-11-15
Abstract:

Many animals use sound for communication, navigation, and foraging, particularly in deep water or at night when light is limited, so describing the soundscape is essential for understanding, protecting, and managing these species and their environments. The nearshore deep-water acoustic environment off the coast of Kona, Hawai’i, is not well documented but is expected to be strongly influenced by anthropogenic activities such as fishing, tourism, and other vessel activity. To characterize the deep-water soundscape in this area we used High-frequency Acoustic Recording Packages (HARPs) to record acoustic data year-round at a 200 or 320 kHz sampling rate. We analyzed data spanning more than 10 years (2007-2018) by producing measurements of frequency specific energy and using a suite of detectors and classifiers for general and specific sound sources. This provided a time series for sounds coming from biological, anthropogenic and physical sources. The soundscape in this location is dominated by signals generated by humans and odontocete cetaceans (mostly delphinids), generally alternating on a diel cycle. During daylight hours the dominant sound sources are vessels and echosounders, with strong signals ranging from 10 Hz to 80 kHz and above, while during the night the clicks from odontocetes dominate the soundscape in mid-to-high frequencies, generally between 10 and 90 kHz. Winter-resident humpback whales are present seasonally and produce calls in lower frequencies (200-2,000 Hz). Overall, seasonal variability is relatively subtle, which is unsurprising given the tropical latitude and deep-water environment. These results, and particularly the inclusion of sounds from frequencies above 2 kHz, represent the first long-term analysis of a marine soundscape in the North Pacific, and the first assessment of the intense, daily presence of manmade noise at this site. The decadal time series allows us to characterize the dynamic nature of this location, and to begin to identify changes in the soundscape over time. This type of analysis facilitates protection of natural resources and effective management of human activities in an ecologically important area.

DOI (Digital Object Identifier): 10.3389/fmars.2021.752231

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
None Anthropogenic
None cycle
None diel
None long-term
None marine mammals
None seasonal
None Soundscape

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
None deep water
None Hawai'i
None Pacific

Publication Information

Publication Type: Journal
Series Name: Frontiers in Marine Science
Series Issue: 8

Source Data Sets

Item Type Title
Data Set (DS) HARP MHI- Hawaii Island

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1097303
W° Bound: -156.017
E° Bound: -156.014
N° Bound: 19.583
S° Bound: 19.577
Description

Approximately 5.5km west of Kahaluu Bay off the west side of the Island of Hawaii.

Extent Group 1 / Time Frame 1

CC ID: 1097304
Time Frame Type: Range
Start: 2007-08-10
End: 2007-09-20

Extent Group 1 / Time Frame 2

CC ID: 1097305
Time Frame Type: Range
Start: 2008-04-18
End: 2008-07-04

Extent Group 1 / Time Frame 3

CC ID: 1097306
Time Frame Type: Range
Start: 2008-07-08
End: 2008-10-15

Extent Group 1 / Time Frame 4

CC ID: 1097307
Time Frame Type: Range
Start: 2008-12-15
End: 2009-02-08
Description:

dates are deployment and recovery dates. No data recovered.

Extent Group 1 / Time Frame 5

CC ID: 1097308
Time Frame Type: Range
Start: 2009-02-10
End: 2009-04-01

Extent Group 1 / Time Frame 6

CC ID: 1097309
Time Frame Type: Range
Start: 2009-04-23
End: 2009-08-18

Extent Group 1 / Time Frame 7

CC ID: 1097310
Time Frame Type: Range
Start: 2009-10-28
End: 2009-12-14

Extent Group 1 / Time Frame 8

CC ID: 1097311
Time Frame Type: Range
Start: 2009-12-20
End: 2010-03-09

Extent Group 1 / Time Frame 9

CC ID: 1097312
Time Frame Type: Range
Start: 2010-04-16
End: 2010-06-16

Extent Group 1 / Time Frame 10

CC ID: 1097313
Time Frame Type: Range
Start: 2010-09-03
End: 2011-03-12

Extent Group 1 / Time Frame 11

CC ID: 1097314
Time Frame Type: Range
Start: 2011-05-12
End: 2011-10-27

Extent Group 1 / Time Frame 12

CC ID: 1097315
Time Frame Type: Range
Start: 2011-10-30
End: 2012-05-18
Description:

dates are deployment and recovery dates. No data recovered.

Extent Group 1 / Time Frame 13

CC ID: 1097316
Time Frame Type: Range
Start: 2012-05-25
End: 2012-07-18

Extent Group 1 / Time Frame 14

CC ID: 1097317
Time Frame Type: Range
Start: 2012-11-17
End: 2013-02-28

Extent Group 1 / Time Frame 15

CC ID: 1097318
Time Frame Type: Range
Start: 2013-05-25
End: 2013-10-19

Extent Group 1 / Time Frame 16

CC ID: 1097319
Time Frame Type: Range
Start: 2013-10-23
End: 2014-03-25

Extent Group 1 / Time Frame 17

CC ID: 1097320
Time Frame Type: Range
Start: 2014-03-25
End: 2014-07-14

Extent Group 1 / Time Frame 18

CC ID: 1097321
Time Frame Type: Range
Start: 2014-07-27
End: 2014-09-10

Extent Group 1 / Time Frame 19

CC ID: 1097322
Time Frame Type: Range
Start: 2014-12-04
End: 2015-03-10

Catalog Details

Catalog Item ID: 65830
GUID: gov.noaa.nmfs.inport:65830
Metadata Record Created By: Karlina PB Merkens
Metadata Record Created: 2021-11-23 21:33+0000
Metadata Record Last Modified By: Marie C Hill
Metadata Record Last Modified: 2021-11-24 22:00+0000
Metadata Record Published: 2021-11-24
Owner Org: PIFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2022-11-25