Biology Reference
In-Depth Information
area (A*H*C), 6) Behavior related to the degree of dolphin occurrence and habitat type
(H*OD*B), 7) Presence of calves related to behavior and habitat (H*C*B).
R ESULTS
Areas and Degree of Occurrence
Fishermen sighted dolphins in a total of 69 locations. These sightings were grouped into
nine areas: Bragança (Br), Salinópolis (S), Vigia (V), Maguarí (M), Soure (So), Belém (Be),
Mouth of Amazonas River (MA), Amazonas Islands (AI) and Amapá (A) (Figure 1).
Of the 314 registered dolphin sightings, 64.3% were considered as common occurrence,
23% seasonal and 12.7% rare. Common occurrence values in the areas Br, M, V, A and AI
were higher than 10%, while in MA, Be and S they were between 5 and 10% and in So it was
3% (Table 1). Inside the areas A, Br, MA, AI, M and V the common occurrence value was
greater than 60%, while in Be, S and So it ranged from 37% to 46% (Figure 2).
100%
80%
60%
40%
20%
0%
A
Be
Br
MA
AI
M
S
So
V
Seasonal
Rare
Common
Areas of Occurrence
Figure 2. Percent occurrence of Sotalia guianensis within areas of the Amazonian Estuary from 1999 to
2001 (Br = Bragança, V = Vigia, S = Salinópolis, M = Maguari, So = Soure, Be = Belém, AI = Amazon
islands, MA = Mouth of Amazonas River, A = Amapá).
Search WWH ::




Custom Search