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The abiotic factors such as light, temperature, and weather do not have a dramatic effect on the marine biome. However, the leading cause of problems in the marine ecosystem is due to, unsurprisingly, man-made biotic factors.
For example, oil spills. Out of all things, these have the largest impact on the marine environment, destroying millions of animals and plants. The oil poisons the water, making it undrinkable. Fish are unable to breathe due to getting the oil through their lungs. Birds get the oil caught in their feathers and beaks and it makes it nearly impossible to fly because of all the weight. Animals such as otters get the oil in their fur and are slowed down a lot in speed.
Global warming has also started to become another problem. Whether or not it exists, temperatures are continuing to rise. The ice on the polar caps starts to melt, water level starts to rise, and temperature changes. Even a few changes in how cold or warm the water is can lead to devastating effects.
Biotic factors are those that are caused by other living organisms. We, humans, are the biggest threat to some of our own environments. The way things have been going without interference, it has worked for several millions of years, so there is not too much worry about a drastic disaster happening because of other organisms.
