Annual Report on the Environment and the Sound Material-Cycle Society in Japan 2007 Page: 20
132 p. : col. ill.View a full description of this text.
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Figure 2-3-2: Estimated shifting of saury fishery caused by rising seawater temperature
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Note 1: "Present" shows current sea-surface temperatures measured by the Japan Metrological Agency (for future global warming trend analysis). "Short-term perspective" represents a rise of
1.0C from the present, and "Middle-term perspective" indicates estimates based on the Agency's long-term projection (for future global warming trend analysis) (a rise of 1.4C from the
present), and "Long-term perspective" represents a rise of 1.5C from the "Middle-term perspective" values.
Note 2: Fishery location is based on the assumption that sea-surface temperature is 16 to 20C in August, 16 to 19C in September, 12 to 23C in October and 12 to 22C in November.
Source: "Estimated Impacts of Global Warming on the Distribution of Marine Organisms in Japan" by Hisami Kuwahara et al, Chikyu Kankyo vol. 11, No. 1 (2006).
globefish, a hatchery fish, could also shift northward.
Some marine creatures that are a nuisance to the fishing industry also seem to be moving northward. Aetobatus flagellum
(longheaded eagle ray), whose habitat ranges over the subtropics from the Indian Ocean to the East China Sea and tropical coastal
areas, is a predator of bivalves such as clams and pen shells, and thus interferes with fishermen. Since 1989, when this ray was first
discovered in the Goto Islands (Nagasaki Prefecture), a great many of them have been located in the Ariake Sea and the Seto Inland
Sea, and fishery damage in those areas has been repeatedly reported.
Also, increased acidity of seawater attributed to increased C02 concentration is considered to affect marine planktons, which
could endanger oceanic biodiversity. In addition, a rising sea-surface temperature is expected to adversely affect the biosphere in
southern water zones, although it could help to improve productivity in northern water zones. In southern waters, if surface
temperatures rise, it would hamper vertical circulation of sea water because of the lowered ability of surface water to be exchanged
with cold deep water. This would weaken the upwelling flow of abyssal nutritious salts, etc., which could seriously affect the
distribution of phytoplankton that constitutes the basis of oceanic food chains. Consequently, it could affect marine products to be
consumed by human beings.
.. impact on uman nealitn
In the Earth, there are many infectious diseases that could be transmitted via vectors that convey pathogens from one host to
another.
For example, malaria spreads through mosquitoes and is potentially threatening to 2.5 billion people in the world, which accounts
for 40% of the global population. Every year, it causes disease in 300 million to 500 million people and kills 1.5 million to 2.7
million people worldwide. It is known that Plasmodia, malaria parasites, become active at a temperature of 15-20C or higher, and20
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Japan. Kankyōsho. Annual Report on the Environment and the Sound Material-Cycle Society in Japan 2007, text, 2007; Tokyo, Japan. (https://digital.library.unt.edu/ark:/67531/metadc11843/m1/22/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .