Use VUE Residency Search to Manage and Visualize Data
As databases continue to grow with more and more animal detections after every deployment, it can become difficult to draw meaningful conclusions from your data. The Residency Search feature in VUE is a great tool to use to help you manage and visualize your data.
Real World Application: Fish River Migrations
There are numerous studies tracking the migration of many different fish species through river systems. These studies are typically set up as gates along the length of the river to help researchers understand the temporal and spatial distribution of fish and the impact of predation as they swim through the system.
The VUE Residency Tool reduces your dataset by combining many detections into a single user defined residency period. From this you can determine when a fish entered an area of interest, how long it stayed there, when it left and if it ever returned. This reduced dataset makes it easier to perform statistical analyses as well as presenting data in different formats such as animations.
Using Residency Search
Under the Detections tab in your VUE database, you can find the Residency Search under the magnifying glass icon. Selecting on this will open a new tab in your database where you can enter your study specific parameters.
Enter your desired start and end times for the search. If you do not change the default settings, the tool will perform the search for the entire length of your database. Select your location, which can be a specific receiver/station or all receivers in your database. You can then specify a specific transmitter or again search for all tags in your database.
The absence threshold is the maximum length of time between two detections to still be considered part of a single residency. The detection threshold is the minimum number detections of a transmitter before it can be considered a resident. Depending on your study question, your choice of absence threshold can depend on a number of variables such as the behavior of your study species, tag programming and expected detection ranges of your receivers. For example, if you were tracking smolts through a river travelling approximately 10 cm/sec with a 30 sec tag delay and your expected detection range of the receivers in your gate was 200 metres, then it would take your fish approximately 67 minutes to travel the 400 metres past your gate with no barriers. With this information you may choose a two hour threshold. Conversely, if you were studying sharks on a reef you may be more interested in knowing if your sharks are leaving and visiting other reefs in the area, so you may set your threshold for 24 hours.
In the following example, if two consecutive detections are separated by more than two hours, then this fish would be considered to have left the area. We can see that A69-1601-3430 left the vicinity of receiver 105684 for approximately 17 hours beginning on February 18th before returning on February 19th.
If you have any questions about this or any other VUE features, please contact our Support Team. Happy analyzing!