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Chromalveolata represents a proposed supergroup within eukaryotes, characterized by chlorophyll c in their plastids and a shared evolutionary origin through secondary endosymbiosis. This group includes Alveolata, Stramenopiles, Rhizarians, and Cryptomonads, each with unique traits and significant ecological roles. They contribute to global oxygen production, form the basis of aquatic food webs, and can impact human health through diseases like malaria.
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Chromalveolata is primarily characterized by the presence of chlorophyll c in their plastids, indicating their ability to perform photosynthesis
Secondary Endosymbiosis
Chromalveolata is believed to have descended from a common ancestor that underwent a secondary endosymbiotic event, resulting in the presence of complex plastids in many members
The subgroups within Chromalveolata are linked by structural and molecular evidence, supporting a common evolutionary lineage
The Alveolata subgroup includes ciliates, dinoflagellates, and apicomplexans, characterized by the presence of alveoli structures
Stramenopiles encompass brown algae, diatoms, and oomycetes, and are recognized by their flagella covered with tripartite hairs
Rhizarians, such as foraminiferans and radiolarians, are known for their elaborate calcium carbonate or silica-based shells
Chromalveolata members, such as diatoms, play a crucial role as primary producers in marine and freshwater environments
Some chromalveolates, like dinoflagellates, can cause harmful algal blooms with devastating effects on marine life and human health
Parasitic chromalveolates, such as Plasmodium, are responsible for serious diseases like malaria, highlighting the importance of studying Chromalveolata for environmental management and public health
The evolutionary history of Chromalveolata is characterized by the significant event of secondary endosymbiosis, giving rise to complex plastids in many members
Molecular clock studies have estimated the divergence times among chromalveolate lineages, providing insight into their evolutionary relationships
The diversity within Chromalveolata is reflected in their varied morphologies and life cycles, which have allowed them to occupy a wide range of ecological niches and interact with other organisms in various ways
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Chromalveolata chlorophyll type
Chromalveolata plastids contain chlorophyll c, indicating photosynthesis.
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Chromalveolata photosynthetic diversity
Not all Chromalveolata members are photosynthetic; some are non-photosynthetic.
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Chromalveolata ecological significance
Chromalveolata contribute to biosphere diversity and participate in ecological processes.
