According to the physicist organization network, according to a new study released by the University of California, Davis, the impact of ocean acidification may be similar to the extinction of marine ecosystems. The research results were published in the latest issue of the online edition of the Proceedings of the National Academy of Sciences.
Previous studies have found that ocean acidification can not only reduce individual species, but also degrade the entire marine ecosystem. This results in fewer plants and animals in the homogeneous marine community.
The author of the paper, Christie Klerkell, a postdoctoral researcher at the University ’s Ocean Laboratory, said: “In this context, the low-level stress caused by ocean acidification may lead to an entire ecosystem transformation, and the result will be dominated by turf algae. all."
Klerker said: "In most ecosystems, there are many colorful and different plant and animal patches, such as algae, sponges and anemones. As the oceans acidify, these patches will be lost. We call Its loss of functional diversity. "
On the coast around a 14th-century Aragonese castle in Italy, carbon dioxide gas bubbles are naturally released from the crater, creating different levels of acidity levels in marine animals and plant communities. These acidic gradients give scientists a glimpse of the future of more and more acidic seawater, and the possible reactions of organisms and plants in these environments.
The researchers selected three reef areas, low acidity, high and extremely high, which represent the state of the world ’s oceans at different times, namely the current, 2100 and 2500 years. Then they removed the animals and vegetation from the rocks there. Every three months for three years, Kleker dived underwater to study the plot, photographing and watching how each area recovered.
By examining how to restore between different areas, the study found that the number and types of species in acid plots have decreased. In non-acid plots, many different plants and animals, including lawn algae, will multiply and grow, and then calcium species such as sea urchins and snails will feed on them. However, in high and extremely high acid plots, hypertrophic turf algae have steadily grown beyond the area, and sea urchins and other herbivores either do not exist or do not eat algae in these areas.
Calcareous herbivores play a key role in maintaining the balance in the marine ecosystem. They are also considered to be the most vulnerable species for ocean acidification.
Klerker said: "Research shows that if the role of these herbivores changes with ocean acidification, you may want to see the cascading effect of the entire ecosystem. If the model is applicable to other calcareous herbivores, this There are also implications for other ecosystems. "
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