Name: LoggerheadSeaTurtleDensity

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Description: These layers represent data from 271 satellite tags deployed on large juvenile and adult loggerheads in the northwest Atlantic by 6 tagging programs between 2004 and 2016. Mixed effect models were used to map spatial variation in the relative density of tagged loggerheads over the course of the year. To do this, daily weighted location estimates were binned by month and aggregated over a 40 km resolution version of the Atlantic Marine Assessment Program for Protected Species (AMAPPS) spatial grid. The data products focus on the area with the highest track densities (i.e., between 25.0° and 41.5° N, 81.5° and 65.0° W), even though some individuals ventured further north or into the Gulf of Mexico. The high density areas shown in these data products are based on over 10 years of satellite tagging data, and represent the relative distribution of tagged loggerheads that may be expected on average in a given month.

Definition Expression: N/A

Copyright Text: NOAA Northeast Fisheries Science Center; Winton et al. 2018. Estimating the distribution and relative density of satellite-tagged loggerhead sea turtles using geostatistical mixed effect models. Marine Ecology Progress Series 586: 217-232

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