List of Chromista by conservation status facts for kids

Imagine a world beneath the waves, full of amazing and tiny living things! Some of these are called Chromista and macroalgae, which are like sea plants. Just like animals, some of these important ocean dwellers need our help to survive.

Since September 2021, a group called the International Union for Conservation of Nature (IUCN) has checked on 15 types of Chromista to see how they are doing. They haven't looked at many other tiny ocean creatures, only those in a group called Phaeophyceae (brown algae). While no Chromista species are officially gone forever, four are thought to be possibly extinct.

In 2005, another group, the New Zealand Threat Classification System (NZTCS), looked at 38 types of macroalgae and found them to be threatened. They also found 23 types that they didn't have enough information about. Some of these species are only a concern for New Zealand.

Protecting Our Ocean's Tiny Wonders

Scientists and conservation groups work hard to understand which species are in danger. They give each species a "conservation status" to show how much help it needs. The IUCN is a global organization that keeps track of species all over the world.

Global Efforts to Save Species (IUCN)

The IUCN uses different categories to describe how threatened a species is. These categories help us know which species need the most urgent attention.

Critically Endangered: On the Brink

These species are in extreme danger and might disappear very soon. Four Chromista species are listed as Critically Endangered and are possibly already extinct. This means we might have lost them forever.

• Bifurcaria galapagensis - known as Galapagos stringweed
• Desmarestia tropica - known as tropical acidweed
• Dictyota galapagensis
• Spatoglossum schmittii

Endangered: Facing High Risks

Species in this category are also at a very high risk of becoming extinct in the wild. They need strong protection to survive.

• Sargassum setifolium - known as string sargassum

Vulnerable: Needs Our Attention

These species are facing a high risk of extinction in the wild in the medium-term future. They are not in immediate danger, but their numbers are decreasing.

• Eisenia galapagensis - known as Galapagos kelp

Data Deficient: Species We Need to Study More

For these species, scientists don't have enough information to decide if they are threatened or not. More research is needed to understand their populations and risks. All of these are types of brown algae (Phaeophyceae).

• Of the Dictyotaceae family:
  • Dictyopteris diaphana
  • Dictyota major
  • Padina concrescens
  • Spatoglossum ecuadoreanum
• Of the Chordariaceae family:
  • Zosterocarpus abyssicola
• Of the Sargassaceae family:
  • Sargassum albemarlense
  • Sargassum galapagense
  • Sargassum templetonii
• Of the Sporochnaceae family:
  • Sporochnus rostratus

New Zealand's Unique Sea Life (NZTCS)

The New Zealand Threat Classification System (NZTCS) is a special system used in New Zealand to assess the conservation status of its native plants and animals, including sea plants.

•   Extinct: 0 species (0.0%)
•   Nationally Critical: 1 species (1.7%)
•   Range Restricted: 37 species (61.7%)
•   Not Threatened: 0 species (0.0%)
•   Data Deficient: 22 species (36.7%)

Species of Algae (NZTCS, 2005)

• 61 living species were checked
• None were introduced from other places
• All 61 were native to New Zealand
  • 22 species needed more study or were not evaluated
  • 38 species were fully evaluated
    • None of the evaluated species were considered "Not Threatened"
    • 37 of the evaluated species were "At Risk"
      • All 37 "At Risk" species were "Range Restricted"
    • 1 of the evaluated species was "Threatened"
      • This 1 "Threatened" species was "Nationally Critical"
    • No evaluated species were found to be extinct

New Zealand's Most Threatened Species

The NZTCS helps New Zealand protect its unique marine life. They have their own categories to show how much help a species needs within their country.

Nationally Critical: Urgent Help Needed

This category means a species is facing the highest risk of extinction within New Zealand. It needs immediate and strong conservation efforts.

• Dione arcuata - This species is found in only one location.

Range Restricted: Living in Small Areas

Many species are "Range Restricted," meaning they only live in a very small area or a few specific places. This makes them more vulnerable to changes in their environment. For example, 37 species of macroalgae were found to be Range Restricted in New Zealand. Some examples include:

• Caulerpa racemosa - This species is secure in other parts of the world.
• Durvillaea chathamensis - Found in only one location.
• Lessonia adamsiae - Found in only one location.
• Sargassum johnsonii - Found in only one location.

Data Deficient: More Research Needed in NZ

Just like with the IUCN, the NZTCS also has species listed as "Data Deficient." This means there isn't enough information to know if they are safe or at risk in New Zealand. More research is needed to understand these species better. For example, 23 species of macroalgae were listed as Data Deficient. Some examples include:

• Acrochaete endostraca
• Caulerpa fastigiata
• Codium perriniae
• Porphyra spp.
• Sebdenia lindaueri - Found in only one location.

Learn More

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