Monday 2 October 2017

Bio-Lit : Assessing the effects of human-caused activities on marine mammals


The rising levels of noise in the ocean that concerns for the well-being of marine mammals and may harm them such as pollution, climate change, and decreased prey.

According to the Marine Science, there are several facts human activities that affect the ocean such as overfishing, pollution, carbon emissions, organic waste, some chemicals released into the ocean and noise pollution is one of the most recent threats to marine life.

The previous Academies reports that the impact of the sound from the marine mammals, they report and research that marine mammals are experiencing stress. The other research communities are exploring the increasing effects of human activities on marine mammals.

According to the report that they have found three main challenges on this issue: understanding the interaction between different stress-causing agents called as stressors, designing studies to understand better the response to more than one to another stressor and the difficulty in detecting impacts at the population level in the ocean.

Their experiment is useful in defining the relationship between the exposure level and the behaviour response to one of the stressors. "Current scientific theory and data for individual marine mammals or their population is not enough to predict the total risk from a combination of threats," said Peter L. Tyack, professor of marine mammal biology at the University of Saint Andrews in Scotland and the chair of the committee that conducted the study and wrote the report. 


As he added, "The model we developed in this report provides a way to examine the effects associated with the exposure to a single stressor in the context of the cumulative effect of other stressors in the animal's environment" 

Credit: NOAA



Although the impacts of the stressors such as persistent chemical pollutants or ocean climate cannot be easily reduced the noise, shipping routes or fisheries so that they can manage to reduce the impact. To be able to decide what's best to reduce the effects of activities that threaten the mammals. For researchers need to develop methods to change in a combination of the stressors to bring the population to have a healthy resilient state.


Photograph by: Enrique R. Aguirre Aves, Oxford Scientific/Getty Images

The committee also recommended using a framework that assesses the health of individual mammals impacted by an activity and using changes in health to determine how it could eventually affect populations.  


In conclusion, the report recommends to build some affordable systems that can detect changes in population in the ocean such as their sizes, rates and to indicate when populations may be at risk due to the exposure of the stressors and try to help the ocean to have a healthy and peaceful state.

Works Cited:
Article:
National Academies of Sciences, Engineering, and Medicine. "Assessing the effects of human-caused activities on marine mammals." ScienceDaily. ScienceDaily, 7 October 2016. <www.sciencedaily.com/releases/2016/10/161007155101.htm>.

Facts:
Marine Science, "Humans Impact on the Oceans". 19 August 2006.
<http://www.marinebio.net/marinescience/06future/olhum.htm>





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