ETHNOECOLOGY OF SOTALIA GUIANENSIS (GERVAIS, 1853) IN THE AMAZON ESTUARY - Biology, Evolution and Conservation of River Dolphins Within South America and Asia - page 249

Figure 1. The Amazonian Estuary area sampled and occurrence of Sotalia guianensis .
For the organization and analysis of data we considered the observation by fishermen as
complete, when they provided answers to all the considered variables. The data were
summarized in tables of absolute frequency, used to construct three-way contingency tables
and then analyzed with a log-linear model for categorical data (Sokal & Rohlf, 1995).
The analyzed interactions were: 1) Behavior related to group size and habitat (H*GS*B),
2) Presence of calves related to group size and habitat (H*GS*C), 3) Degree of Dolphin
Occurrence related to group size and habitat (H*GS*OD), 4) Behavior related to the group
size in each sampling area (A*GS*B), 5) Presence of calves related to habitat and sampling