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Lake Trout Movement and Spawning Locations within the Tangle Lakes System

This study used telemetric procedures to describe movement and locate spawning areas of lake trout Salvelinus namaycush within the 4 interconnected Tangle Lakes (Upper, Round, Shallow and Lower). A total of 100 radio tags were deployed among the 4 lakes: 13 tags in Upper Tangle, 25 tags in Round Tangle, 22 tags in Shallow Tangle and 40 tags in Lower Tangle. Fish were tracked with airplane, boat and 3 fixed-tracking stations between the lakes.

In addition, boat tracking occurred at night with spotlights to document spawning aggregations of lake trout in all 4 lakes.

Operational Plan

The operational plan can be found here:

https://www.adfg.alaska.gov/FedAidPDFs/ROP.SF.3F.2022.03.pdf

Repository Contents:

/R

TangleLakes_supplemental.R contains some supplemental analysis, since much of the analysis has already been performed elsewhere. This script has three distinct sections:

  • Visualizing movement between discrete lakes as Sankey plots (in which movement is visualized as flow) and discrete time-series plots (in which movement is visualized as points and connecting lines).
  • Tabulating movement and creating some additional summaries, also producing basic plots of length composition
  • A Bayesian survival model summarizing whether individual-level variables had any overall effect on survival over the course of a project, after accounting for differences in survival rates between sequential surveys.

/flat_data

Tangle_movement.csv contains the data used as input for the .R file above. This sheet was a subset of cells copied from the master .xlsx dataset.

/figures

All figures created by the .R file.

  • Sankey_full.jpg and Sankey_collapse.jpg give both Sankey (flow) plots, with all possible states and the collapsed states, respectively.
  • DiscreteTS_full.jpg and DiscreteTS_tangle.jpg give both discrete time-series plots, with all possible states and the set of four Tangle lakes, respectively.
  • length_box.jpg and length_hist.jpg give simple length compositions
  • survmodelXX.jpg give output plots from the set of models for NATURAL mortality
  • survmodelXX_fishingmort.jpg give output plots from the set of models for FISHING mortality.

/tables

Tables created by the .R file. These are created as individual .csv files without any formatting.

  • tableto_XXX.csv and tablefrom_XXX.csv give the counts and proportions of tagged fish migrating TO and FROM each lake/state, relative to each lake/state. Effectively, these are tabular representations of the flows depicted in the Sankey plots.
  • sum_mvt_betweenlakes.csv tabulates the numbers of times fish moved between each pair of lakes. It should be noted that the data source for this was the locations as determined by flights & boat surveys, rather than the fixed stations.
  • scenario_tbl.csv tabulates the number of fish that stay located in each lake or each pair of lakes.