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Publications (7)
Line transect aerial surveys are widely used for estimating abundance of biological populations, including threatened species. However, estimates obtained with data collected from aircraft are often underestimated because of visibility bias and bias in estimating group sizes from a fast-moving platform. An assessment of multiple sources of bias in...
The franciscana (Pontoporia blainvillei) is the most threatened small cetacean of South America. The species isendemic to coastal waters of the western South Atlantic Ocean, where it is distributed from Itaúnas (Brazil) toGolfo San Matias (Argentina). Its range was divided in four Franciscana Management Areas (FMAs) for con-servation purposes. Howe...
Aerial surveys are considered the most effective way of estimating abundance of franciscanas (Pontoporia blainvillei). However, estimates obtained with data collected from aircrafts are often underestimated because of visibility bias or bias in estimating group sizes from a fast-moving platform. Independent boat and aerial surveys were concurrently...
