Changes in abundance are likely to be more pronounced near major ecosystem boundaries. The rate of climate change may prove to be a major determinant of the abundance and distribution of new populations. Rapid change from physical forcing usually will favor production of smaller, low-priced, opportunistic species that discharge large numbers of eggs over long periods. Regionally, gains or losses in freshwater fisheries will depend on changes in the amount and timing of precipitation, on temperatures, and on species tolerances. For example, increased rainfall during a shorter period in winter could lead to reduced summer levels of river flows, lakes, and wetlands and thus to reductions in freshwater fisheries.
Aquaculture is particularly important to Temperate Asia.
Climate change impacts generally will be positive through faster growth, lower winter mortality rates, reduced ice cover, and reduced energy costs as a result of expanded regions of warmer water. Cultivation of warm-water species also may expand. Coastal Systems 10.2.4.1. Even with assumed stabilization of global greenhouse gas emissions, sea level is projected to continue to rise beyond the year 2100 because of lags in climate response. Regional differences will exist as a result of wind and atmospheric pressure patterns, regional ocean density differences, and oceanic circulation.