Open Government Licence (OGL)

ECOMMAS is a long-term, on-going study into how underwater noise generated by offshore industry impacts the distribution of dolphins and porpoises in the Scottish North Sea. 
Acoustic recorders (C-PODs and SM2Ms) are deployed at 30 sites across 10 locations along the east coast.  They record underwater noise and count echolocation clicks to measure dolphin and porpoise presence and absence.  They are deployed in the spring and are recovered after ~ 4 months.  In 2015 and 2016, a second deployment was issued in July/August.

Data is presented as detection-positive days (DPD) and detection-positive hours (DPH) for both species.

DPD = The detection of echolocation clicks per day
(1 = Detection-positive, 0 = Detection-negative)

DPH = The number of hours echolocation clicks are detected per day

Nall = Total number of clicks detected per day

Ndays = Total number of days recorded

PorpDPH_median = Median porpoise detection-positive hours for each site

DolDPH_median = Median dolphin detection-positive hours for each site

Proportion_PorpDPD = Proportion of porpoise detection-positive days (out of total days recorded, Ndays)

Proportion_DolDPD = Proportion of dolphin detection-positive days (out of total days recorded, Ndays)

Data has been prepared as ArcGIS maps showing median DPH and proportion of DPD for both species across all 30 sites.  It has also been converted to be viewed on the NMPi, and for direct download as a spread sheet (.csv)

ECOMMAS is a long-term, on-going study into how underwater noise generated by offshore industry impacts the distribution of dolphins and porpoises in the Scottish North Sea. 
Acoustic recorders (C-PODs and SM2Ms) are deployed at 30 sites across 10 locations along the east coast.  They record underwater noise and count echolocation clicks to measure dolphin and porpoise presence and absence.  They are deployed in the spring and are recovered after ~ 4 months.  In 2015 and 2016, a second deployment was issued in July/August.

Data is presented as detection-positive days (DPD) and detection-positive hours (DPH) for both species.

DPD = The detection of echolocation clicks per day
(1 = Detection-positive, 0 = Detection-negative)

DPH = The number of hours echolocation clicks are detected per day

Nall = Total number of clicks detected per day

Ndays = Total number of days recorded

PorpDPH_median = Median porpoise detection-positive hours for each site

DolDPH_median = Median dolphin detection-positive hours for each site

Proportion_PorpDPD = Proportion of porpoise detection-positive days (out of total days recorded, Ndays)

Proportion_DolDPD = Proportion of dolphin detection-positive days (out of total days recorded, Ndays)

Data has been prepared as ArcGIS maps showing median DPH and proportion of DPD for both species across all 30 sites.  It has also been converted to be viewed on the NMPi, and for direct download as a spread sheet (.csv)

ECOMMAS is a long-term, on-going study into how underwater noise generated by offshore industry impacts the distribution of dolphins and porpoises in the Scottish North Sea. 
Acoustic recorders (C-PODs and SM2Ms) are deployed at 30 sites across 10 locations along the east coast.  They record underwater noise and count echolocation clicks to measure dolphin and porpoise presence and absence.  They are deployed in the spring and are recovered after ~ 4 months.  In 2015 and 2016, a second deployment was issued in July/August.

Data is presented as detection-positive days (DPD) and detection-positive hours (DPH) for both species.

DPD = The detection of echolocation clicks per day
(1 = Detection-positive, 0 = Detection-negative)

DPH = The number of hours echolocation clicks are detected per day

Nall = Total number of clicks detected per day

Ndays = Total number of days recorded

PorpDPH_median = Median porpoise detection-positive hours for each site

DolDPH_median = Median dolphin detection-positive hours for each site

Proportion_PorpDPD = Proportion of porpoise detection-positive days (out of total days recorded, Ndays)

Proportion_DolDPD = Proportion of dolphin detection-positive days (out of total days recorded, Ndays)

Data has been prepared as ArcGIS maps showing median DPH and proportion of DPD for both species across all 30 sites.  It has also been converted to be viewed on the NMPi, and for direct download as a spread sheet (.csv)

Measuring fishing effort is important for assessing the environmental sustainability of fish stocks and the socioeconomic efficiency of fishing activity. Fishing effort describes the amount of fishing gear used on a fishing ground over a given unit of time. Effort in this case is defined as number of creels hauled per day per 4 km2. This survey interviewed 198 creel vessel skippers from four regions, two on the west and two on the east coast of Scotland. This analysis has been produced from these SAMPLED vessels only. This IS NOT a census and IS NOT a map of all creeling effort in these waters or in the survey areas. This is an indication of potential fishing effort only and if creeling is not quantified in an area in this map, that DOES NOT mean creeling is not taking place. Equally quantified effort could be higher given some creeling vessels were not surveyed. Fishing effort outside of the surveyed area was not measured.