Some species spend significant portions of their life out of the water or “hauled out”. These periods are associated with important parts of their life history such as resting, maintaining a breeding territory, giving birth or nursing a pup. The amount of time spent hauled out is also important to correct visual survey data.
20-Minute and Percentage-Dry Timelines were designed to correct aerial survey data. The Dry-Deep-Neither (DDN) timelines were designed to identify foraging behavior. The Haulout Behavior Tool can help to define haulout behavior and life-history parameters.
Twenty Minute Timelines divide a 24-hour day into 72 20-minute blocks of time. Each 20-minute block is marked whether the the tag was on average wet or dry. Tags with a depth sensor can use a user-defined depth threshold, and the 20-minute blocks report whether the tag was deeper or shallower than the depth threshold
The Percentage Dry Timelines indicate the percentage of time the tag was dry for each hour of the day.
- SPOT5 timelines are accurate to 10%
- SPLASH timelines support two resolutions:
- High resolution – accurate to 1%
- Low resolution – accurate to 10%
The Dry-Deep-Neither Timeline (DDN Timeline) is designed to provide insight into the foraging behavior of the animal. Each hour of the day is marked as “dry”, “deep” or “neither”. User-definable parameters determine the definition of these statuses.
The Haul-Out Behavior Tool provides high resolution time, duration, and Fastloc® GPS locations for the haulouts. These data can help identify haulout behavior and life-history parameters such as feeding, nursing, molting, and mating.
Note that this tool can only be used on data from on Fastloc equipped tags.