The primary range of this subpopulation consists of coastal western Taiwan from the estuaries of the Houlong and Jhonggang rivers (MiaoliCounty) in the north to Waishanding Zhou (a large sandbar off ChiayiCounty) in the south (see Figure 1 in the attached PDF). However, one sighting of about 20 dolphins has been confirmed from the inshore waters of Tainan County and a dolphin, almost certainly a “stray,” was observed at the mouth of Fugang Harbour (Taitung County) where adjacent waters are deep and oceanic (i.e., clearly not the preferred habitat of this species). All sightings have been within 3 km off shore with the exception of the mud flats/littoral zone in the ChanghuaCounty, the central part of the distribution, where extensive oyster mariculture structures and associated activities likely exclude dolphins physically (Wang et al. 2007b). The distribution is linear, i.e. similar to that of a riverine species. Most of the dolphins in this subpopulation have been sighted in and around the two main estuaries of western Taiwan (Dadu and Joushuei rivers of Taichung, Changhua and Yunlin counties) (Wang et al. 2007a, b).
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