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Commercial Whaling Evolution

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The North Atlantic right whale (Eubalaena glacialis) is a cetacean species that is found primarily in the waters off the eastern coast of North America, between the Gulf of Maine and the Bay of Fundy (Asaro, 2012). The population of the right whale was significantly diminished during the 18th and 19th century, when the species was subjected to commercial whaling that nearly drove the species to extinction (Caswell et al., 1999). Today, it is still one of the most endangered species of large whales, with only an estimated 300 – 400 individuals left (Doucette et al., 2012). While commercial whaling has been discontinued for decades, the right whale is still being directly impacted by anthropogenic activities, such as vessel strikes and entanglements …show more content…
Related to an increased abundance of greenhouse gases, these increasing temperatures can lead to a rise in sea levels, increased severity of storm surges, changes in ocean wave climate, and overall increase in sea surface temperatures (Mori et al., 2013). In the context of the North Atlantic Ocean, the increase in sea surface temperatures may also lead to North Atlantic Oscillation greater intensity of harmful algal blooms, and overall changes in breeding and birthing habitats for various marine mammal species, including the right whale (Greene and Pershing, 2000; Greene and Pershing, 2004). Combined, these environmental conditions all play a role in decreasing the population of the right …show more content…
These blooms are known to cause paralytic shellfish toxins (PSTs), saxitoxins (STX), and domoic acid (DA). The right whale is primarily exposed to these toxins by ingesting zooplankton that feed on these toxic algal species, and due to increasing temperatures, have been increasing in severity and intensity in the last 15 years (Faimali et al., 2012). In a study conducted by Doucette et al. (2012), fecal analysis of approximately 150 right whales showed that 70 to 80% of the individuals tested were exposed to PSTs and 25 to 30% were exposed to DA. Additionally, 85 to 100% of the lactating and pregnant females that were tested and 100% of the juveniles tested were exposed to PSTs. Because these toxins are potent sodium-channel blockers and are water soluble, they are readily absorbed in the lipophilic tissues and the gastrointestinal mucosa. Chronic exposure and high toxic levels can lead to respiratory difficulties, loss of control over heat-conserving mechanisms, impaired diving capabilities, reduced ingestion rates, disruption of migration, and overall poorer condition of health (Durbin et al.,

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