Diel and other patterns

Four ways to find diel patterns: 1. Look at 1hr display of data for daily cycle This only shows the time period on the screen. Data: Danielle Kreb

Four ways to find diel patterns: 2. Graph the diel pattern. Select these on the view + page: and click here This only shows the time period on the screen.

CP3 file has too few clicks (531) to be reliable CP3 file has too few clicks (531) to be reliable. CP1 file, with 5million clicks shows a diurnal pattern. These must be non-cetacean clicks. Data: Danielle Kreb

Four ways to find diel patterns: 3. Look at the auto-correlation of 1hr click counts. First double-click in the display area of the file of interest to select it for auto- correlation. Click the ac.f button This will show the auto-correlation for the whole file.

Borneo, Mahakam river, Muara Pahu Borneo, Mahakam river, Muara Pahu. This is a very clear, stable 24 hour cycle: … but what is making these sounds? Data: Danielle Kreb

Kawda file, CP1, all clicks … There's correlation over 6 days, due to the monsoon noise. But there's a weaker daily pattern seen on top of it. Data: Konkan Cetacean Research Team

Kawda file, CP3, dolphin clicks from GENENC … Most of the 6 days ac.f has gone but the daily pattern persists, so that was due to dolphin clicks … + porpoises?

Kawda file, CP3, porpoise clicks from GENENC … Finless Porpoises show only a weak 24 correlation, so it was due to the Humpback Dolphins. Data: Konkan Cetacean Research Team

Four ways to find diel patterns: 4. Export the data into a database and do it all there…

... nocturnal activity - dolphins in the Chesapeake River Data: Bethany Roberts

A tidal pattern: … the correlation peak for all clicks moves relative to the day Data: Lighthouse Field Station

A tidal pattern: … the correlation peak for dolphin clicks is static in tidal (93m) bins – their habitat use is tide-driven. Data: Lighthouse Field Station

Encounter duration: Kawda file, CP3, Finless Porpoise clicks from GENENC this line is the 95% confidence level Use 1 or 5minute samples (bins) Encounter duration = 3 hours! i.e. if you hear an FP your chance of hearing another is significantly higher for the next 3 hours. For Humpback dolphins it's 4.5 hours. Data: Konkan Cetacean Research Team

Landmark sequences As a travelling porpoise approaches an acoustic landmark its clicks get faster. CPOD exe has automated detection and export of landmark sequences. See ‘Landmark poster.pdf’ Data: SAMBAH

Hope that made sense