Design and field methods for sighting surveys of cetaceans in coastal and riverine habitats

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Abundance and conservation status of the Yangtze finless porpoise in the Yangtze River, China (2008, methodology): “We used passing mode and closing mode line transect methods (Buckland et al., 2001; Butterworth and Borchers, 1988; Dawson et al., 2008) throughout the survey.”
The Yangtze finless porpoise: On an accelerating path to extinction? (2014, background): “This is consistent with the loss of other megafauna in this region (Dudgeon, 2010; Turvey et al., 2010).”
An approach for regional threat assessment under IUCN Red List criteria that is robust to uncertainty: The Fiordland bottlenose dolphins are critically endangered (2009, background): “In light of the numerous impacts facing regional populations of coastal dolphins, studies of vital rates and abundance (see Hammond et al., 1990; Dawson et al., 2008) are sorely needed for many potentially threatened regional populations (e.”