The Effect Of Oa On Marine Biodiversity

1704 Words Dec 14th, 2015 7 Pages
i) Alternative views
In contrast to the paradigm of thought, Hendriks et al. (2010b) contend that, while ocean acidification is occurring at an increasing global rate, there is not enough evidence to show significance of OA to marine biodiversity. He agrees with the position of Rockström et al. (2009), Turley & Gattuso (2012), Keller et al. (2009) and Veron (2008), which is that calcification is the most sensitive process responding directly to ocean acidification. However, he asserts that the warnings in the scientific community claiming that ocean acidification is a major threat to marine biodiversity has little experimental support (Hendriks & Duarte, 2010a). To arrive to this conclusion, he applied a meta-analysis of the literature regarding the effect of OA on marine organisms. This included an analysis of 42 articles, with 372 experimentally evaluated responses of 44 species. They noted that calcification rates will decline by, on average, 25% at elevated pCO2 (partial pressure of carbon dioxide) values of 731-759 ppmv (Hendriks & Duarte, 2010b). These pCO2 values are estimated by the IPCC to be reached within the 21st century (IPCC, 2007). Yet Hendriks and colleague (2010b) argue that these high levels of calcification rates are unlikely to occur, as this is the upper limit projection held by the IPCC and a worst-case scenario. Additionally, the time it would take to reach this greater elevation of pCO2 and consequent increased acidification will likely allow…
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