489
temporary (e.g., scratches) or permanent (e.g., nicks and mutilations), caused by a
variety of factors. Natural markings can be caused by bites from conspecifics, or
abrasions from the ground (Würsig and Jefferson 1990; Dufault and Whitehead
1998). Generally, only a portion of the population can be identified through natural
marks (Gowans and Whitehead 2001).
Recent abundance estimates in Babitonga Bay were acquired using markrecapture methods, but prior to these studies distance sampling technique surveys
over linear transects were employed. Guiana dolphin abundance in Babitonga Bay
Fig. 17.11 Staff in field work, finding a Guiana dolphin group during photoidentification survey
Fig. 17.12 Staff in field work, finding a franciscana dolphin group during photoidentification
survey
17 Behavior and Ecology of Endangered Species Living Together: Long-Term…
temporary (e.g., scratches) or permanent (e.g., nicks and mutilations), caused by a
variety of factors. Natural markings can be caused by bites from conspecifics, or
abrasions from the ground (Würsig and Jefferson 1990; Dufault and Whitehead
1998). Generally, only a portion of the population can be identified through natural
marks (Gowans and Whitehead 2001).
Recent abundance estimates in Babitonga Bay were acquired using markrecapture methods, but prior to these studies distance sampling technique surveys
over linear transects were employed. Guiana dolphin abundance in Babitonga Bay
Fig. 17.11 Staff in field work, finding a Guiana dolphin group during photoidentification survey
Fig. 17.12 Staff in field work, finding a franciscana dolphin group during photoidentification
survey
17 Behavior and Ecology of Endangered Species Living Together: Long-Term…