498
the back, clearly caused by boat propellers. Flach (2006) reported a high number of
estuarine dolphins with injuries related to human activities in Sepetiba Bay in Rio
de Janeiro, Brazil. Areas with high dolphin concentration in the bay tend to coincide
with tourist routes, and there are few reports of animals with cut wounds, probably
due to collision with boats (Cremer 2000).
Although there is only one case of injury caused by boat propeller in Babitonga
Bay, boat traffic can change animal behavior (Figs. 17.19 and 17.20). As vessels
approach, dolphin emersions become gradually more discreet, and dives become
longer in duration. Dolphins may also move away from the area temporarily, and
groups may divide as a consequence of frequent boat passage.
Fig. 17.20 Boats pass in high speed inside the core areas of franciscana dolphins population in
Babitonga Bay
Fig. 17.19 A case of
injury caused by boat
propeller in Babitonga Bay
M.J. Cremer et al.
the back, clearly caused by boat propellers. Flach (2006) reported a high number of
estuarine dolphins with injuries related to human activities in Sepetiba Bay in Rio
de Janeiro, Brazil. Areas with high dolphin concentration in the bay tend to coincide
with tourist routes, and there are few reports of animals with cut wounds, probably
due to collision with boats (Cremer 2000).
Although there is only one case of injury caused by boat propeller in Babitonga
Bay, boat traffic can change animal behavior (Figs. 17.19 and 17.20). As vessels
approach, dolphin emersions become gradually more discreet, and dives become
longer in duration. Dolphins may also move away from the area temporarily, and
groups may divide as a consequence of frequent boat passage.
Fig. 17.20 Boats pass in high speed inside the core areas of franciscana dolphins population in
Babitonga Bay
Fig. 17.19 A case of
injury caused by boat
propeller in Babitonga Bay
M.J. Cremer et al.