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The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Bacterial Communities Associated With Crustose Coralline Algae Are Host-Specific.

Abigail C Turnlund1,2,3, Paul A O'Brien1, Laura Rix1

  • 1Australian Centre for Ecogenomics, The University of Queensland, Brisbane, Queensland, Australia.

Microbiologyopen
|January 15, 2026
PubMed
Summary

Crustose coralline algae (CCA) host distinct bacterial communities that vary by algal species and phylogeny. Environmental factors like light and depth also influence these crucial reef-building algae microbiomes.

Keywords:
Great Barrier ReefIndo‐PacificRhodophytacoral reefsmicrobiomesymbiosis

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Area of Science:

  • Marine Biology
  • Microbial Ecology
  • Coral Reef Science

Background:

  • Crustose coralline algae (CCA) are vital for coral reef ecosystems, supporting growth, stability, and recruitment.
  • The bacterial communities associated with CCA are largely uncharacterized, representing a significant knowledge gap.

Purpose of the Study:

  • To characterize the surface microbial communities of diverse Indo-Pacific CCA species.
  • To investigate the factors driving the structure and diversity of CCA-associated bacterial communities.

Main Methods:

  • 16S rRNA amplicon sequencing was employed to analyze microbial communities.
  • Samples were collected from 15 CCA species across eight families on the Great Barrier Reef.

Main Results:

  • CCA microbial community composition was distinct and primarily differentiated by algal host species.
  • Bacterial community divergence correlated with host phylogeny and environmental parameters like light and depth.
  • This study provides foundational data on CCA bacterial communities across a wide range of species.

Conclusions:

  • Algal host species and phylogeny are key drivers of CCA-associated bacterial communities.
  • Environmental factors play a role in shaping these microbial associations.
  • This research establishes essential baseline data for future studies on CCA microbial symbiosis.