Fig 1.
Map of Brazil, showing the location of the study site and (inset) the Mamirauá channel itself.
Fig 2.
Scatterplots of the number of observed botos per survey as a function of time, including the trend line and 95% confidence intervals estimated by the model.
(A) Entire study (Nov 1994—Jan 2017); (B) Nov 1994—Dec 1999; (C) Jan 2000—Jan 2017.
Fig 3.
Scatterplots of the number of observed tucuxis per survey as a function of time, including the trend line and 95% confidence intervals estimated by the model.
(A) Entire study (Nov 1994—Jan 2017); (B) Nov 1994—Dec 1999; (C) Jan 2000—Jan 2017.
Table 1.
Model results for boto counts.
The unit of time is one day, so a coefficient of -0.00015 represents a decline in the number of encountered botos of 0.015% per day, or 5.48% per year during the entire sampling period.
Table 2.
Model results for tucuxi counts.
The unit of time is one day, so a coefficient of -0.00021 represents a decline in the number of encountered tucuxis of 0.021% per day, or 7.67% per year during the entire sampling period.