...
Another adverse effect from global warming is coral bleaching. When corals are stressed by high water temperatures or other effects, they expel their symbiotic zooxanthelle from their tissues. This process deprives corals of the color, as well of their primary source of nutrition. If corals are without their symbionts for too long they can perish from starvation. The impact of coral death can spread through the reef ecosystem. Secondary effects are most obvious in fish, especially among those that feed specifically on corals, such as butterfly fish. These fish were gradually starving to death and the decline in numbers indicated they had also failed to breed in the months and years following the destruction of their reef. As it stands today, more than 30% of coral reefs throughout the world are already severely degraded and up to 60% of corals may be lost by 2030 due to temperature induced bleaching (ARC, 2007).
It is also likely that climate change will have severe, direct effects on the human aspects of many fisheries. Sea level rise may threaten many coastal areas. humans. Thermal expansion of seawater alone is expected to cause a rise of 0.09 to 0.37 m over the next century (IPCC, 2001). This may threaten coastal cities, and infrastructure of the fishing industry in some areas. modest sounding rise is enough to threaten many coastal cities. It is also predicted that storms, such as monsoons and hurricane my hurricanes, may increase in number and intensity as a result of global warming (IPCC, 2001). Flooding and storm surges could also result in damages to fishing infrastructure in locations prone to these disasters. Terrestrial effects of global warming could effect Global warming can affect land-based agriculture in certain areas by the changes in timing and intensity of droughts and flooding, as well as the effect of increased CO2 on the growth of crops and weeds. There are also likely to be effects on agriculture by sustained changes in temperature and precipitation, such as the desertification of the southwestern United States (IPCC, 2001). This could lead to a change in the demand for fish by some regionschanging precipitation. Desertification is a major threat in areas such as the southwestern United States (IPCC 2001). Increased carbon dioxide levels will also alter the growth rates of crops and weeds. In certain environments, changes in the productivity of traditional agriculture could lead to a changes in fish demand.
Range of future temperature predictions made by different models (IPCC, 2001)
...