Temperature is one of the primary environmental factors that directly impacts the lives of marine organisms, controlling many vital processes such as growth, reproduction, migration, and feeding. With the escalation of climate change and rising ocean temperatures, marine organisms face significant challenges that threaten their sustainability and the balance of marine ecosystems.<br /><br />Impact of Increased Temperature<br />Rising sea temperatures are associated with multiple impacts on marine organisms, including:<br /><br />Thermal stress: Marine organisms living in stable marine environments are affected by specific temperatures. When temperatures rise suddenly or continuously, these organisms may experience heat stress, leading to reduced growth and reproduction rates and even death.<br /><br />Coral bleaching: One of the most common phenomena resulting from rising water temperatures is coral bleaching. Coral reefs lose their microscopic algae, weakening them and possibly killing them. This, in turn, affects thousands of organisms that depend on them for shelter and food.<br /><br />Species distribution changes: Some marine organisms may migrate to cooler areas in search of a suitable environment, leading to changes in the distribution of marine species. This change may disrupt the balance of the ecosystem and affect food chains.<br /><br />Impact of Low Temperatures<br />In some areas, sudden changes or low temperatures may lead to:<br /><br />Reduced activity of marine organisms, slowing growth and reproduction.<br /><br />A negative impact on cold-sensitive species, potentially causing their populations to decline or even threatening their extinction in those areas.<br /><br />Impact of Changes on Marine Behavior<br />Changes in temperature also affect the behavior of marine organisms, such as:<br /><br />Altering the timing of migration or reproduction, which may cause mating periods to be out of sync with ideal conditions.<br /><br />Altering feeding patterns or daily activity, affecting organisms' ability to obtain food and survive.<br /><br />Al-Mustaqbal University is the first university in Iraq.