Long-Term Monitoring of Anthropogenic Noise and Its Relationship to Bottlenose Dolphin (Tursiops truncatus) Distribution in the Cres–Lošinj Archipelago, Northern Adriatic, Croatia
The Cres-Lošinj archipelago represents an important nursing and feeding ground for the resident Tursiops truncatus (bottlenose dolphin) population. Scientific research on Tursiops truncatus in this area has been conducted since 1987, and the population abundance is currently estimated to be 113 individuals (95% CI = 107–121; SE = 6.967), showing a significant decline of 39% between 1995 and 2003 (Fortuna 2006). Being top predators, dolphins represent the symbol of a healthy environment; hence a reduction in their abundance is considered an indication of the endangered status of this population. The low Tursiops truncatus density in the region may be related to the habitat degradation of the northern Adriatic waters, particularly to the scarce availability of food resources in an environment subject to high anthropogenic pressure (Bearzi et al. 2004).
KeywordsEncounter Rate Bottlenose Dolphin Vessel Type Anthropogenic Noise Noisy Area
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