...The vaquita is now the most critically endangered small cetacean in the world. In 2006, its population was estimated at 400 (Blackwell, 2006). But more recently, its population size is estimated to be only about 200, further declining every year (Kirby, 2012). While genetic analyses and population simulations initially suggested that the vaquita has always been rare and that its population reduction has occurred over evolutionary time, it has more recently been discovered that its mortality rate is due to anthropogenic factors. Other hypotheses for the decline in the vaquita population that have been studied are that the water flowing from the Colorado River was polluted which decreases the flow of freshwater, or that the mortality rate is a product of inbreeding (D’agrosa et al. 2000). However, the biggest reason for the decline of vaquitas living in the temperate waters of the Gulf of California is that they are simply victims...
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