{"id":87962,"date":"2018-11-30T10:54:06","date_gmt":"2018-11-30T20:54:06","guid":{"rendered":"https:\/\/www.hawaii.edu\/news\/?p=87962"},"modified":"2018-11-30T10:54:06","modified_gmt":"2018-11-30T20:54:06","slug":"new-mudweed-species","status":"publish","type":"post","link":"https:\/\/www.hawaii.edu\/news\/2018\/11\/30\/new-mudweed-species\/","title":{"rendered":"New mudweed species threatens Hawai\u02bbi marine environments"},"content":{"rendered":"Reading time: <\/span> 2<\/span> minutes<\/span><\/span>
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Avrainvillea erecta<\/em> in Honolulu waters.<\/figcaption><\/figure>\n

A team of scientists led by researchers from the University of Hawaiʻi<\/span> at M\u0101noa Department of Botany<\/a> has discovered two populations of a new species of leather mudweed or Avrainvillea erecta, a widespread tropical algae, which may pose a threat to Hawaiʻi<\/span>\u2019s marine environments.<\/p>\n

\"the
Avrainvillea amadelpha<\/em> or Leather Mudweed in Honolulu waters.<\/figcaption><\/figure>\n

Using both physical and genetic features of the seaweed, the team determined that the new arrival is most likely Avrainvillea erecta<\/em>. However, much like the previous invader Avrainvillea amadelpha<\/em>, the identification was challenging. <\/p>\n

“There has not been very much work done on this group of green algae, and it is very challenging because it is quite variable in how it presents itself,” said doctoral student Rachael Wade<\/strong>, who is working on this group for her dissertation research. “As a result, it\u2019s difficult to conclusively identify these species until more thorough genetic work can be completed.”<\/p>\n

The mode of this algae’s introduction is currently unknown. Given the close proximity of the two populations to urbanized estuaries and major seaports, the seaweed may have been introduced via regular boat traffic. It is also possible that the seaweed was introduced as debris following the 2011 T\u014dhoku earthquake and resulting tsunami.<\/p>\n

Regardless of the identification of both Avrainvillea<\/em> species, these seaweeds are of concern due to their potential threat to Hawaiʻi<\/span>\u2019s marine environments. Avrainvillea amadelpha<\/em> has overgrown shallow reefs in Maunalua Bay in East Honolulu and outcompeted seagrass meadows. While the impacts of Avrainvillea erecta<\/em> are unknown and require further study, it may have similar competitive traits and may negatively impact Hawaiʻi<\/span>\u2019s reefs.<\/p>\n

According to the researchers, the two species of algae are relatively easy to tell apart and identify in the water. Avrainvillea amadelpha<\/em> often forms a patchy carpet on either rock or in sand with several spoon- or paddle-shaped blades per patch and is generally dark grayish or brownish green in color. In contrast, Avrainvillea erecta<\/em> generally has one brilliant green, kidney-shaped blade and a long, conical holdfast and is only found in sandy habitats.<\/p>\n

Help researchers track the new mudweed species<\/h2>\n

“We encourage everyone to keep an eye out for this new species as they spend time in the water,” said 糖心视频<\/abbr> M\u0101noa postdoctoral researcher Heather Spalding<\/a><\/strong>. “It\u2019s important that we continue to track this species as it spreads.” <\/p>\n

On sighting either of these species of seaweed, please consider documenting a report through Eyes of the Reef<\/a> and contact Rachael Wade at rmwade@hawaii.edu<\/a>.<\/p>\n

In addition to Wade and Spalding, the research team includes 糖心视频<\/abbr> M\u0101noa Botany Professor and Chair Alison Sherwood<\/a>, scientists from state and federal agencies, a local commercial diver and a postdoctoral fellow at the Smithsonian Marine Station in Fort Pierce, Florida.<\/p>\n","protected":false},"excerpt":{"rendered":"

A team of scientists in the Department of Botany discovered a new species of leather mudweed.<\/p>\n","protected":false},"author":16,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[368,308,109,9],"class_list":["post-87962","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research","tag-botany","tag-college-of-natural-sciences","tag-coral-reefs","tag-uh-manoa","entry","has-media"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t