“Ishmael” software (by David Mellinger, NOAA PMEL) Spectrogram correlation with synthetic...
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Transcript of “Ishmael” software (by David Mellinger, NOAA PMEL) Spectrogram correlation with synthetic...
““Ishmael” softwareIshmael” software
(by David Mellinger, NOAA (by David Mellinger, NOAA PMEL)PMEL)
•Spectrogram correlation Spectrogram correlation with synthetic callwith synthetic call
•Varied synthetic call Varied synthetic call parametersparameters
•Compared detector Compared detector performance to analyst performance to analyst (LMM)(LMM)
Analyzing the Date - Call Analyzing the Date - Call detectiondetection
Right whale and humpback Right whale and humpback callscalls
0 40 80 120
Time (s)
200
160
120
80
40
Fre
qu
en
cy (
Hz)
0 40 80 120
Time (s)
200
160
120
80
40
Sp
ect
rum
leve
l (d
B r
e c
ou
nts
2/H
z)
Right whale calls:
‘Up-call’ most common (> 80%)
Clustered into bouts
Humpback whale calls:
May appear similar to RW calls
Patterned, repeated phrases
Right whale seasonal occurrence
ResultsR
igh
t w
ha
le c
all
s/d
ay
2000-2005
J F M A M J J A S O N D
SEBS middle-shelf •Earliest yearly right whale detections in late May (2002, 2004)
•Latest in mid-December (2005)
•Highest calling rates in Aug., Sep. (2001, 2004, 2005) & Dec. (2005)
•Longest calling durations in Aug., Sep., Oct.
•Calling usually lasted 2-3 consecutive days, up to 6 d
•Intervals between calls 2-49 d (median = 7)
Daily Calling Patterns Daily Calling Patterns
•Hourly calling rates calculated for five periods of day
•Adjusted by overall calling rate for that day
•Calling rates were highest during dark period
75%
Median
Mean
25%
*
ConclusionsConclusions
• Right whale occurrence varied by Right whale occurrence varied by season and between yearsseason and between years
• Calls were detected for only a few Calls were detected for only a few days at a timedays at a time
• Calling rates were highest at nightCalling rates were highest at night• Right whales were in the Southeast Right whales were in the Southeast Bering Sea as early as May and as Bering Sea as early as May and as late as Decemberlate as December